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Geology of Guernsey

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Construction aggregate , or simply aggregate , is a broad category of coarse- to medium-grained particulate material used in construction , including sand , gravel , crushed stone , slag , recycled concrete and geosynthetic aggregates. Aggregates are the most mined materials in the world. Aggregates are a component of composite materials such as concrete and asphalt ; the aggregate serves as reinforcement to add strength to the overall composite material. Due to the relatively high hydraulic conductivity value as compared to most soils, aggregates are widely used in drainage applications such as foundation and French drains , septic drain fields, retaining wall drains, and roadside edge drains. Aggregates are also used as base material under foundations, roads, and railroads . In other words, aggregates are used as a stable foundation or road/rail base with predictable, uniform properties (e.g. to help prevent differential settling under the road or building), or as a low-cost extender that binds with more expensive cement or asphalt to form concrete. Although most kinds of aggregate require a form of binding agent, there are types of self-binding aggregate which require no form of binding agent.

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78-509: Guernsey has a geological history stretching further back into the past than most of Europe. The majority of rock exposures on the Island may be found along the coastlines, with inland exposures scarce and usually highly weathered . There is a broad geological division between the north and south of the Island. The Southern Metamorphic Complex is elevated above the geologically younger, lower lying Northern Igneous Complex . Guernsey has experienced

156-536: A tidal island . Le Braye du Valle was drained and reclaimed in 1806 by the British Government as a defence measure. The eastern end of the former channel became the town and harbour (from 1820) of St Sampson's , now the second biggest port in Guernsey. The western end of La Braye is now Le Grand Havre. The roadway called "The Bridge" across the end of the harbour at St Sampson's recalls the bridge that formerly linked

234-1296: A 30-year bond in December 2015 for £330m, its first bond in 80 years. The island has been given a credit rating of AA-/A-1+ with a stable outlook from Standard & Poor's . Construction aggregate In Europe, sizing ranges are specified as d / D , where the d shows the smallest and D shows the largest square mesh grating that the particles can pass. Application-specific preferred sizings are covered in European Standard EN 13043 for road construction, EN 13383 for larger armour stone, EN 12620 for concrete aggregate, EN 13242 for base layers of road construction, and EN 13450 for railway ballast. The American Society for Testing and Materials publishes an exhaustive listing of specifications including ASTM D 692 and ASTM D 1073 for various construction aggregate products, which, by their individual design, are suitable for specific construction purposes. These products include specific types of coarse and fine aggregate designed for such uses as additives to asphalt and concrete mixes, as well as other construction uses. State transportation departments further refine aggregate material specifications in order to tailor aggregate use to

312-403: A complex geological evolution (especially the rocks of the southern complex) with multiple phases of intrusion and deformation recognisable. Guernsey is composed of nine main rock types; two of these are granites and the rest gneiss . Guernsey is a parliamentary representative democracy and a British Crown Dependency . The Lieutenant Governor of Guernsey is the "representative of

390-503: A complex geological evolution (especially the rocks of the southern complex) with multiple phases of intrusion and deformation recognisable. The southern part if the island is largely composed of Icart Gneiss . The Icart Gneiss is an augen gneiss of granitic composition containing potassium feldspar . This was formed from a granite dated at 2,061  million years ago using U-Pb dating on zircon grains. A foliated Perelle quartz diorite (also called Perelle Gneiss ), occurs in

468-405: A landfill, is gathered, melted, mixed, reformulated and expanded to create low density aggregates that maintain high strength properties under compressive loads. Such geosynthetic aggregates replace conventional gravel while simultaneously increasing porosity, increasing hydraulic conductivity and eliminating the fine dust "fines" inherent to gravel aggregates which otherwise serve to clog and disrupt

546-619: A parish meeting each year. The senior Douzenier is known as the Doyen (Dean). Two elected Constables ( Connétables ) carry out the decisions of the Douzaine, serving for between one and three years. The longer serving Constable is known as the Senior Constable and his or her colleague as the Junior Constable. The Douzaines levy an Occupiers Rate on properties to provide funding for running of

624-413: A popular offshore finance centre for private-equity funds . Guernsey does not have a Central Bank and it issues its own sterling coinage and banknotes . UK coinage and (English, Scottish and Northern Irish-faced) banknotes also circulate freely and interchangeably. Total island investment funds, used to fund pensions and future island costs, amount to £2.7billion as at June 2016. The island issued

702-617: A population of 63,950, the vast majority of whom live on Guernsey, and the island has a land area of 24 square miles (62 km ). Guernsey was part of the Duchy of Normandy until 1204, when the Channel Islands remained loyal to the English crown, splitting from mainland Normandy. In 1290, the Channel Islands were divided administratively and Guernsey became part of the Bailiwick of Guernsey. During

780-507: A thrifty balancing of cost and common sense in the construction of works. This will be observed if, in the first place, the architect does not demand things which cannot be found or made ready without great expense. For example: it is not everywhere that there is plenty of pit-sand, rubble, fir, clear fir, and marble... Where there is no pit sand, we must use the kinds washed up by rivers or by the sea... and other problems we must solve in similar ways. The advent of modern blasting methods enabled

858-421: A tidal range of 10 metres (33 feet) and fast currents of up to 12 knots , this makes sailing in local waters dangerous. The very large tidal variation provides an environmentally rich inter-tidal zone around the islands, and some sites have received Ramsar Convention designation. The tidal flows in the area are remarkable, owing to the flatness of the ground for nearly 32 km (20 mi) westward. Guernsey

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936-399: Is 2.5 km from north to south and is 0.8 km thick. It dips shallowly to the west. The lower and upper portions are layered on the scale of a meter, while millimeter scale layering is found on the uppermost parts. This is also dated at 570  million years ago . Near Vale Castle the rock is of a type called bojite with interlocking hornblende and plagioclase crystals. During

1014-507: Is Les Vardes on the west coast of the Island, operated by Ronez . Here the Bordeaux Diorite is extracted and crushed on site to produce aggregate . Many of the disused quarry sites have been allowed to fill with water, such as St. Andrews Reservoir, now used by the States of Guernsey water board. Mont Cuet is another former quarry, now used as a landfill site to dispose of the majority of

1092-544: Is also a source of Guernsey law for those matters which are reserved to the UK, namely defence and foreign affairs. The head of the bailiwick judiciary in Guernsey is the Bailiff, who, as well as performing the judicial functions of a Chief Justice, is also the head of the States of Guernsey and has certain civic, ceremonial and executive functions. The Bailiff's functions may be exercised by

1170-502: Is based at Victor Hugo 's former residence at Hauteville House . While the jurisdiction of Guernsey has complete autonomy over internal affairs and certain external matters, the topic of complete independence from the British Crown has been discussed widely and frequently, with ideas ranging from Guernsey obtaining independence as a Dominion to the bailiwicks of Guernsey and Jersey uniting and forming an independent Federal State within

1248-446: Is called the States of Deliberation ( États de Délibération ) and consists of 38 People's Deputies, elected on an islandwide basis every four years. There are also two representatives from Alderney , a semi-autonomous dependency of the Bailiwick, but Sark sends no representative since it has its own legislature. The Bailiff or Deputy Bailiff preside in the assembly. There are also two non-voting members: H.M. Procureur (analogous to

1326-487: Is crushed to provide subbase for roads and driveways, among other purposes. According to the USGS in 2006, 2.9 million tonnes of Portland cement concrete (including aggregate) worth $ 21.9 million was recycled, and 1.6 million tonnes of asphalt concrete (including aggregate) worth $ 11.8 million was recycled, both by crushed stone operations. Much more of both materials are recycled by construction and demolition firms not included in

1404-633: Is not dangerous to handle. It can be used as pipe bedding—placed around sewer, storm water or drinking water pipes to transfer weight from the surface and protect the pipe. Another common use is as fill to bring the level of a concrete floor even with a foundation. Use of glass aggregate helps close the loop in glass recycling in many places where glass cannot be smelted into new glass. Aggregates themselves can be recycled as aggregates. Recyclable aggregate tends to be concentrated in urban areas. The supply of recycled aggregate depends on physical decay and demolition of structures. Mobile recycling plants eliminate

1482-703: Is not part of the United Kingdom , although defence and most foreign relations are handled by the British Government. The entire jurisdiction lies within the Common Travel Area of the British Islands and the Republic of Ireland . Taken together with the separate jurisdictions of Alderney and Sark it forms the Bailiwick of Guernsey . The deliberative assembly of the States of Guernsey ( États de Guernesey )

1560-598: Is responsible for Guernsey's constitutional and external affairs, developing strategic and corporate policy and coordinating States business. It also examines proposals and Reports placed before Guernsey's Parliament (the States of Deliberation) by Departments and Non States Bodies. The President of the committee is the de facto head of government of Guernsey. Guernsey's legal system originates in Norman Customary Law, overlaid with principles taken from English common law and Equity as well as from statute law enacted by

1638-526: Is the Old Norse for "island", while the original root, "guern(s)", is of uncertain origin and meaning, possibly deriving from either a personal name such as Grani or Warinn, or from gron , meaning pine tree. Previous names for the Channel Islands vary over history, but include the Lenur islands, and Sarnia ; Sarnia for Guernsey, or Lisia (Guernsey) and Angia (Jersey). Around 6000 BC, rising seas created

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1716-590: Is the westernmost of the Channel Islands , and the jurisdiction is at the greatest distance from the coast of Normandy than any of the other islands. Guernsey's climate is temperate with mild winters and mild, sunny summers. It is classified as an oceanic climate , with a dry-summer trend, although marginally wetter than Mediterranean summers. The warmest months are July and August, when temperatures are generally around 20 °C (68 °F) with some days occasionally going above 24 °C (75 °F). On average,

1794-453: Is typically uneconomical. These are capital -intensive operations, utilizing large earth-moving equipment, belt conveyors, and machines specifically designed for crushing and separating various sizes of aggregate, to create distinct product stockpiles. According to the USGS , 2006 U.S. crushed stone production was 1.72 billion tonnes valued at $ 13.8 billion (compared to 1.69 billion tonnes valued at $ 12.1 billion in 2005), of which limestone

1872-529: The Lager Lindele (Lindele Camp) near Biberach an der Riß and to Oflag VII-C in Laufen . Guernsey was very heavily fortified during World War II , out of all proportion to the island's strategic value. German defences and alterations remain visible, particularly to Castle Cornet and around the northern coast of the island. Guernsey and Jersey were both liberated on 9 May 1945, now celebrated as Liberation Day on

1950-511: The English Channel and separated the Norman promontories that became the bailiwicks of Guernsey and Jersey from continental Europe . Neolithic farmers then settled on its coast and built the dolmens and menhirs found in the islands today, providing evidence of human presence dating back to around 5000 BC. Evidence of Roman settlements on the island, and the discovery of amphorae from

2028-574: The Herculaneum area and Spain, show evidence of an intricate trading network with regional and long-distance trade. Buildings found in La Plaiderie, St. Peter Port dating from 100 to 400 AD appear to be warehouses. The earliest evidence of shipping was the discovery of a wreck of a ship in St Peter Port harbour , which has been named Asterix . It is thought to be a 3rd-century Roman cargo vessel and

2106-570: The Parliamentarians . The allegiance was not total, however; there were a few Royalist uprisings in the southwest of the island, while Castle Cornet was occupied by the Governor, Sir Peter Osborne , and Royalist troops. In December 1651, with full honours of war, Castle Cornet surrendered—the last Royalist outpost anywhere in the British Isles to surrender. Wars against France and Spain during

2184-574: The Quaternary Devensian glaciation, loess was deposited, blown in by wind from the west. The island was only separated from the continent of Europe by rising sea levels at about 5000 BC during the new stone age. Many of the rocks present in the south of Guernsey may also be observed on Lihou Island . At the western coast of the island, a shear zone is exposed at the contact between the Perelle Foliated Quartz Diorite and

2262-493: The Second World War , Guernsey was invaded and occupied by Nazi Germany . After five years of occupation, the island was liberated on 9 May 1945, that date being celebrated annually as Liberation Day . Guernsey is administered as part of the Bailiwick of Guernsey, a self-governing dependency of the British Crown . The island is thus not part of the United Kingdom , although the UK government has certain responsibilities for

2340-604: The Second World War , the Channel Islands were occupied by German troops . Seventeen thousand people from Guernsey's total population of 41,000 were evacuated to England before the German occupation. The evacuees included 80 per cent of Guernsey children who lived with relatives or strangers in Great Britain during the war. Most children returned home after the war ended in 1945. The occupying German forces deported over 1,000 Guernsey residents to camps in southern Germany, notably to

2418-455: The pound sterling and the status of English as the primary native language. Norman and French culture also have an impact, such as the island's traditional language, Guernésiais . In addition, French writer Victor Hugo spent fifteen years in exile in Guernsey, where he wrote some of his best-known works. The island's name, "Guernsey", like that of neighbouring " Jersey ", is of Old Norse origin. The second element of each word, " -ey ",

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2496-622: The "lamping technique" to ground ships close to the island. This intensified during the Hundred Years War , when, starting in 1339 , the island was occupied by the Capetians on several occasions. The Guernsey Militia was first mentioned as operational in 1331 and would help defend the island for a further 600 years. In 1372, the island was invaded by Aragonese mercenaries under the command of Owain Lawgoch (remembered as Yvon de Galles ), who

2574-577: The 17th and 18th centuries allowed Guernsey shipowners and sea captains to exploit the island's proximity to mainland Europe by applying for letters of marque and turning their cargo ships into privateering vessels . By the beginning of the 18th century, Guernsey's residents were starting to settle in North America, in particular founding Guernsey County in Ohio in 1810. The threat of invasion by Napoleon prompted many defensive structures to be built at

2652-586: The 9th century. The principal court is the Royal Court and exercises both civil and criminal jurisdiction. Additional courts, such as the Magistrate's Court, which deals with minor criminal matters, and the Court of Appeal, which hears appeals from the Royal Court, have been added to the Island's legal system over the years. Several European countries have a consular presence within the jurisdiction. The French Consulate

2730-557: The Bailiwick. The British monarch is the head of state and the head of government is the President of the Policy and Resources Committee . The jurisdiction's parliament and government is the States of Guernsey . The island is divided into ten parishes . It has one town, called Saint Peter Port . The government variously defines the position of the King of England as "Head of State" or "successor to

2808-512: The Brioverian group that outcrop on nearby Jersey It is named after Pleinmont Point on the south west tip of the Island. The older rocks were deformed during the Cadomian Orogeny. The Icart Gneisses formed the basement to an outboard terrane that was subsequently accreted to Armorica . The Cobo Granite was formed at approximately 570  million years ago , named after Cobo Bay on

2886-639: The Climate Change Policy & Action Plan adopted in August 2020. Guernsey has a geological history stretching further back into the past than most of Europe. It forms part of the geological province of France known as the Armorican Massif . There is a broad geological division between the north and south of the island. The Southern Metamorphic Complex is elevated above the geologically younger, lower-lying Northern Igneous Complex. Guernsey has experienced

2964-607: The Commonwealth, whereby both islands retain their independence with regards to domestic affairs but internationally, the islands would be regarded as one state. Although it was not a member of the European Union , it had a special relationship with it until Brexit . It had been treated as part of the European Community with access to the single market for the purposes of the free trade in goods. From 2021 with free travel to

3042-547: The Crown in right of the république of the Bailiwick of Guernsey". The official residence of the Lieutenant Governor is Government House. Since 2022 the incumbent has been Lieutenant General Richard Cripwell CB , CBE , CStJ . The post was created in 1835 as a result of the abolition of the office of Governor. Since that point, the Lieutenant Governor has always resided locally. The jurisdiction

3120-489: The Deputy Bailiff. The posts of Bailiff and Deputy Bailiff are Crown appointments. Sixteen Jurats, who need no specific legal training, are elected by the States of Election from among Islanders. They act as a jury, as judges in civil and criminal cases and fix the sentence in criminal cases. First mentioned in 1179, there is a list of Jurats who have served since 1299. The oldest Courts of Guernsey can be traced back to

3198-495: The Duke of Normandy. Although no document explicitly defines the Head of State as a "monarch", or the islands as a monarchy, all documents refer to the king by royal titles. Guernsey's largest industry is financial services , followed by tourism and agriculture. The island is particularly well known for its cattle . Guernsey's culture is strongly influenced by Britain , evident in its use of

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3276-639: The Icart Gneiss. The younger quartz diorite is mylonitised , where field evidence suggests that it was most likely deformed synchronously with its intrusion. The contact between the two rocks is tightly folded , as are the mylonitic fabrics in the two rocks. Dykes are abundant on the Island, largely of doleritic composition. Guernsey has had an active quarrying industry over the years, largely removing rock for use as building materials. Many local houses are constructed of either blue-grey Bordeaux Diorite, or red-brown Cobo Granite. The only remaining active quarry

3354-618: The Island's non-recyclable waste. Guernsey in the Bailiwick of Guernsey  (red) Guernsey ( / ˈ ɡ ɜːr n z i / GURN -zee ; Guernésiais : Guernési ; French : Guernesey ) is the second-largest island in the Channel Islands , located 27 miles (43 km) west of the Cotentin Peninsula , Normandy . It is the largest island in the Bailiwick of Guernsey , which includes five other inhabited islands – Alderney , Herm , Jethou , Lihou and Sark – and many small islets and rocks. The bailiwick has

3432-669: The Royal Sanction at regular meetings of the Privy Council in London, after which they are returned to the islands for formal registration at the Royal Court . The States also make delegated legislation known as Ordinances ( Ordonnances ) and Orders ( ordres ) which do not require the Royal Assent . Commencement orders are usually in the form of ordinances. The Policy and Resources Committee

3510-601: The UK are largely unaffected by Brexit . Situated in Mont Saint-Michel Bay at around 49°35′N 2°20′W  /  49.583°N 2.333°W  / 49.583; -2.333 , Guernsey, Herm and some other smaller islands together have a total area of 71 square kilometres (27 sq mi) and coastlines of about 46 kilometres (29 mi). Elevation varies from sea level to 110 m (360 ft) at Hautnez on Guernsey. There are many smaller islands, islets, rocks and reefs in Guernsey waters. Combined with

3588-847: The USGS survey. For sand and gravel, the survey showed that 4.7 million tonnes of cement concrete valued at $ 32.0 million was recycled, and 6.17 million tonnes of asphalt concrete valued at $ 45.1 million was recycled. Again, more of both materials are recycled by construction and demolition firms not in this USGS survey. The Construction Materials Recycling Association indicates that there are 325 million tonnes of recoverable construction and demolition materials produced annually. Many geosynthetic aggregates are made from recycled materials. Recyclable plastics can be reused in aggregates. For example, Ring Industrial Group's EZflow product lines are produced with geosynthetic aggregate pieces that are more than 99.9% recycled polystyrene . This polystyrene, otherwise destined for

3666-591: The administration. Guernsey's Church of England parishes fall under the See of Canterbury , having split from the Bishopric of Winchester in 2014. The biggest parish is Castel, while the most populated is St Peter Port. Financial services, such as banking, fund management , and insurance, account for about 37% of GDP. Tourism, manufacturing, and horticulture, mainly tomatoes and cut flowers, especially freesias , have been declining. Light tax and death duties make Guernsey

3744-472: The balance for other uses. Granulated blast furnace slag sales in 2006 were for use in cementitious materials (94%), and the balance for other uses. Steel furnace slag sales in 2006 were for use in road bases and surfaces (51%), asphaltic concrete (12%), for fill (18%), and the balance for other uses. Recycled glass aggregate crushed to a small size is substituted for many construction and utility projects in place of pea gravel or crushed rock. Glass aggregate

3822-531: The centre and west of the island. This is a calc-alkaline tonalitic rock. The foliation was formed at around 600  million years ago during the Cadomian Orogeny . Rafts of metamorphosed sediments, older than the Foliated Perelle Diorite are embedded between them. The Pleinmont Formation consists of metamorphosed sediments is of unknown age, although it has been proposed that these belong to

3900-624: The civil order of the island was fully regulated even before the Norman conquest of England. In 1204, when King John lost the continental portion of the Duchy to Philip II of France , the islands remained part of the Kingdom of England. The islands were then recognised by the 1259 Treaty of Paris as part of Henry III 's territories. During the Middle Ages , the island was a haven for pirates that would use

3978-609: The coldest month is February with an average air temperature of 6.9 °C (44.4 °F). Average air temperature reaches 17.1 °C (62.8 °F) in August. Snow rarely falls and is unlikely to settle, but is most likely to fall in February. The temperature rarely drops below freezing, although strong wind-chill from Arctic winds can sometimes make it feel like it. The rainiest months are December (average 119 mm (4.7 in)), November (average 107 mm (4.2 in)) and January (average 92 mm (3.6 in)). July is, on average,

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4056-483: The competent legislature(s) – usually, but not always, the States of Guernsey. Guernsey has almost complete autonomy over internal affairs and certain external matters. However, the Crown – that is to say, the UK Government – retains an ill-defined reserved power to intervene in the domestic affairs of any of the three Crown Dependencies within the British Islands "in the interests of good government". The UK Parliament

4134-427: The concrete sets. One group put the concrete under pressure as it sets, reducing pore volumes. Recycled aggregate in the UK results from the processing of construction material. To ensure the aggregate is inert , it is manufactured from material tested and characterised under European Waste Codes . In 2008, 210 million tonnes of aggregate were produced including 67 million tonnes of recycled product, according to

4212-476: The continent ceasing, additional bureaucratic procedures come into force, including the need for international driving licences and green cards for vehicle insurance. Guernsey has ten parishes , which act as civil administration districts with limited powers. Each parish is administered by a Douzaine, made up of twelve members or more, known as Douzeniers. Douzeniers are elected for a four-year mandate, three, four or five Douzeniers being elected by parishioners at

4290-450: The cost of transporting the material to a central site. The recycled material is typically of variable quality. Many aggregate products are recycled for other industrial purposes. Contractors save on disposal costs and less aggregate is buried or piled and abandoned. In Bay City, Michigan , for example, a recycle program exists for unused products such as mixed concrete, block, brick, gravel, pea stone, and other used materials. The material

4368-542: The development of quarries , which are now used throughout the world, wherever competent bedrock deposits of aggregate quality exist. In many places, good limestone , granite , marble or other quality stone bedrock deposits do not exist. In these areas, natural sand and gravel are mined for use as aggregate. Where neither stone, nor sand and gravel, are available, construction demand is usually satisfied by shipping in aggregate by rail, barge or truck . Additionally, demand for aggregates can be partially satisfied through

4446-447: The end of that century. The early 19th century saw a dramatic increase in the prosperity of the island, due to its success in the global maritime trade , and the rise of the stone industry. Maritime trade suffered a major decline with the move away from sailing craft as materials such as iron and steel were not available on the island. Le Braye du Valle was a tidal channel that made the northern extremity of Guernsey, Le Clos du Valle,

4524-519: The estates of Sausmarez, Les Bruniaux de St. Martin, Mauxmarquis, Rohais, etc. Most of Guernsey was soon cultivated, and around this time the island was divided into ten parishes. Each free fief had a manorial court to hear disputes between tenants, and the Abbot of St. Michael and the Seigneur d'Anneville had the right of high jurisdiction and the privilege of trying and executing criminals, respectively, so that

4602-503: The lands within the Close of the Vale to the abbot forever as fief of St. Michael, with permission to extend this to the northwestern part of the island as soon as settlers could be found to clear and cultivate the land; and he gave them engineers and workmen to complete the castle of St. Michael and to erect such other forts as were deemed necessary. Around the middle of the eleventh century, Guernsey

4680-551: The mid west coast. The north end of the island is an unfoliated calc-alkaline pluton of the Bordeaux Diorite Complex consisting of diorite , tonalite , and granodiorite . This is also dated at 570  million years ago . On the central east coast around Saint Peter Port is the St Peter Port Gabbro containing layers with olivine , hornblende and two kinds of pyroxene . The igneous plutonic intrusion

4758-600: The needs and available supply in their particular locations. Sources for these basic materials can be grouped into three main areas: mining of mineral aggregate deposits, including sand, gravel, and stone; use of waste slag from the manufacture of iron and steel; and recycling of concrete, which is itself chiefly manufactured from mineral aggregates. In addition, there are some (minor) materials that are used as specialty lightweight aggregates: clay , pumice , perlite , and vermiculite . People have used sand and stone for foundations for thousands of years. Significant refinement of

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4836-543: The neutrality. The French attempted to invade Jersey a year later in 1549 but were defeated by the militia . The neutrality lasted another century, until William III of England abolished the privilege due to privateering activity against Dutch ships. In the mid-16th century, the island was influenced by Calvinist reformers from Normandy. During the Marian persecutions , three women, the Guernsey Martyrs , were burned at

4914-415: The operation of many drainage applications. Several groups have attempted to use minced tires as part of concrete aggregate. The result is tougher than regular concrete, because it can bend instead of breaking under pressure. However, tires reduce compressive strength partially because the cement bonds poorly with the rubber. Pores in the rubber fill with water when the concrete is mixed, but become voids as

4992-482: The other Channel Islands represent the last remnants of the medieval Duchy of Normandy . About the year 1030, the fleet of Robert, Duke of Normandy , which was to support the claim of his cousins Alfred and Edward to the English crown against Canute , was scattered by a storm, and was driven down the Channel to Guernsey. The Duke was taken to St. Michael's Abbey. In gratitude for the abbot's hospitality, he gave all

5070-510: The production and use of aggregate occurred during the Roman Empire , which used aggregate to build its vast network of roads and aqueducts. The invention of concrete, which was essential to architecture utilizing arches, created an immediate, permanent demand for construction aggregates. Vitruvius writes in De architectura : Economy denotes the proper management of materials and of site, as well as

5148-462: The quarry/plant to the first point of sale or use. According to the USGS , 2006 U.S. sand and gravel production was 1.32 billion tonnes valued at $ 8.54 billion (compared to 1.27 billion tonnes valued at $ 7.46 billion in 2005), of which 264 million tonnes valued at $ 1.92 billion was used as concrete aggregates. The great majority of this was again moved by truck, instead of by electric train . Currently, total U.S. aggregate demand by final market sector

5226-608: The role of Attorney General ) and H.M. Comptroller (analogous to Solicitor General ), both appointed by the Crown and collectively known as the Law Officers of the Crown. A projet de loi is the equivalent of a UK bill or a French projet de loi , and a law is the equivalent of a UK act of parliament or a French loi . A draft law passed by the States can have no legal effect until formally approved by His Majesty in Council and promulgated by means of an order in council . Laws are given

5304-402: The stake for their Protestant beliefs, along with the infant son of one of the women. The burning of the infant was ordered by Bailiff Hellier Gosselin, with the advice of priests nearby who said the boy should burn due to having inherited moral stain from his mother. Later on, Hellier Gosselin fled the island to escape widespread outrage. During the English Civil War , Guernsey sided with

5382-485: The sunniest month with 253 hours recorded sunshine; December the least with 58 hours recorded sunshine. Sea temperatures have been rising and now vary between 8 °C (46 °F) in February to 20 °C (68 °F) in August. Average wind speeds vary between 20 kilometres per hour (12 mph) and 40 kilometres per hour (25 mph) with gusts over 60 kilometres per hour (37 mph) every 4–5 years. Guernsey plans to reach carbon neutrality by 2050, according to

5460-464: The two islands. During the late 1940s, the island repaired the damage caused to its buildings during the occupation. The tomato industry started up again and thrived until the 1970s when the significant increase in world oil prices led to a sharp, terminal decline. Tourism has remained important. Finance businesses grew in the 1970s and expanded in the next two decades and are important employers. Guernsey's constitutional and trading relationships with

5538-454: The two parts of Guernsey at high tide. New roads were built and main roads were metalled for ease of use by the military. Infrastructure was funded by creating money debt-free starting in 1815. During the First World War , about 3,000 island men served in the British Expeditionary Force . Of these, about 1,000 served in the Royal Guernsey Light Infantry regiment formed from the Royal Guernsey Militia in 1916. From 30 June 1940, during

5616-414: The use of slag and recycled concrete . However, the available tonnages and lesser quality of these materials prevent them from being a viable replacement for mined aggregates on a large scale. Large stone quarry and sand and gravel operations exist near virtually all population centers due to the high cost of transportation relative to the low value of the product. Trucking aggregate more than 40 kilometers

5694-566: The water during cooling gives granulated slag hydraulic cementitious properties. In 2006, according to the USGS , air-cooled blast furnace slag sold or used in the U.S. was 7.3 million tonnes valued at $ 49 million, granulated blast furnace slag sold or used in the U.S. was 4.2 million tonnes valued at $ 318 million, and steel furnace slag sold or used in the U.S. was 8.7 million tonnes valued at $ 40 million. Air-cooled blast furnace slag sales in 2006 were for use in road bases and surfaces (41%), asphaltic concrete (13%), ready-mixed concrete (16%), and

5772-421: Was 1,080 million tonnes valued at $ 8.19 billion from 1,896 quarries, granite was 268 million tonnes valued at $ 2.59 billion from 378 quarries, trap rock was 148 million tonnes valued at $ 1.04 billion from 355 quarries, and the balance other kinds of stone from 729 quarries. Limestone and granite are also produced in large amounts as dimension stone . The great majority of crushed stone is moved by heavy truck from

5850-523: Was 30%–35% for non-residential building (offices, hotels, stores, manufacturing plants, government and institutional buildings, and others), 25% for highways, and 25% for housing. Recycled material such as blast furnace and steel furnace slag can be used as aggregate or partly substitute for portland cement . Blast furnace and steel slag is either air-cooled or water-cooled. Air-cooled slag can be used as aggregate. Water-cooled slag produces sand-sized glass-like particles (granulated). Adding free lime to

5928-580: Was beset by a new breed of pirates who built a castle called Le Château des Sarrasins in the centre of the island near the present church of Catel; Duke William of Normandy (later the Conqueror) commissioned his Esquire Sampson d'Anneville to fight them. As a reward, in 1061 he received half of the western part of the island under the title of Fief d'Anneville. Sampson attracted many emigrants from Normandy to settle on his feudal estate, and Duke William distributed lands in Guernsey to other Norman landowners, such as

6006-595: Was in the pay of the French king. Owain and his dark-haired mercenaries were later absorbed into Guernsey legend as invading fairies from across the sea. As part of the peace between England and France, Pope Sixtus IV issued in 1483 a papal bull granting the "Privilege of Neutrality'", by which "the Islands, their harbours and seas, as far as the eye can see," were considered neutral territory. Anyone molesting Islanders would be excommunicated. A royal charter in 1548 confirmed

6084-569: Was probably at anchor or grounded when a fire broke out. Travelling from the Kingdom of Gwent , Saint Sampson , later the abbot of Dol in Brittany , is credited with the introduction of Christianity to Guernsey. In 933, the Cotentin Peninsula , including Avranchin , which included the islands, were placed by the French King Ranulf under the control of William I . The island of Guernsey and

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