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concrete information meaning

Posted by on 2021-01-07

Bonding agents are used to create a bond between old and new concrete (typically a type of polymer) with wide temperature tolerance and corrosion resistance. An abstract example of addition is something like this: When we add, we're taking the value of one set and … concrete phrase. Definitions by the largest Idiom Dictionary. Once the ingredients are mixed, workers must put the concrete in place before it hardens. That same rule went into effect 23 June 2018 for general industry, hydraulic fracturing and maritime. This surpassed the previous record by 50% in total volume and 7.5% in total area. Large concrete forms that cannot be adequately covered are not poured in freezing temperatures. Cement, usually in powder form, acts as a binding agent when mixed with water and aggregates. Lime mortar—made of…, Reinforced concrete, because of its inherent strength in compression, is primarily used for long spans in funicular compression forms, including vaults, shells, and domes. By applying a measured amount of stretching force to the steel, the amount of compression transmitted to the concrete can be carefully regulated. It is then filled in three layers of equal volume, with each layer being tamped with a steel rod to consolidate the layer. "Curing Concrete" Peter C. Taylor CRC Press 2013. Whereas concrete is itself a building material, mortar is a bonding agent that typically holds bricks, tiles and other masonry units together.[8]. [citation needed] Bacillus sp. Concrete’s strength is affected by environmental factors, especially temperature and moisture. Normal Strength Concrete2. For most routine uses, 20 MPa (2,900 psi) to 32 MPa (4,600 psi) concrete is often used. Concrete production is time-sensitive. The definition can include materials (or mixtures of materials) such as, for example, crushed concrete, masonry (bricks or blocks) or recycled asphalt. Therefore, it is usually reinforced with materials that are strong in tension, typically steel rebar. During concrete preparation, various technical details may affect the quality and nature of the product. [116][117] The pour (a part of the foundation for the Abu Dhabi's Landmark Tower) was 16,000 cubic meters of concrete poured within a two-day period. Portland cement and similar materials are made by heating limestone (a source of calcium) with clay or shale (a source of silicon, aluminum and iron) and grinding this product (called clinker) with a source of sulfate (most commonly gypsum). [113][114], The Polavaram dam works in Andhra Pradesh on 6 January 2019 entered the Guinness World Records by pouring 32,100 cubic metres of concrete in 24 hours. Understand what concrete thinking … An abstract example of addition is something like this: When we add, we're taking the value of one set and … [13] Concrete was used for construction in many ancient structures. The presence of some substances in concrete, including useful and unwanted additives, can cause health concerns due to toxicity and radioactivity. 40 MPa (5,800 psi) concrete is readily commercially available as a more durable, although more expensive, option. Reinforced concrete adds either steel reinforcing bars, steel fibers, aramid fibers, carbon fibers, glass fibers, or plastic fibers to carry tensile loads. Tests can be performed to ensure that the properties of concrete correspond to specifications for the application. [23] Roman concrete is significantly more resistant to erosion by seawater than modern concrete; it used pyroclastic materials which react with seawater to form Al-tobermorite crystals over time.[24][25]. concrete definition: 1. a very hard building material made by mixing together cement, sand, small stones, and water: 2…. Minimizing stress prior to curing minimizes cracking. The amount of concrete used in the construction of the dam is estimated at 16 million cubic meters over 17 years. Companies which fail to meet the tightened safety regulations can face financial charges and extensive penalties. Abstract terms refer to ideas or concepts; they have no physical referents. Many precautions are observed in cold weather placement. Its invention is usually attributed to Joseph Monier, a Parisian gardener who made garden pots and tubs of concrete reinforced with iron mesh; he received a patent in 1867. Whichever equipment builders use, however, the objective is to produce the desired building material; ingredients must be properly mixed, placed, shaped, and retained within time constraints. This third Eddystone Lighthouse pioneered the use of hydraulic lime in concrete, using pebbles and powdered brick as aggregate. Let's say that I'm trying to describe addition. [35] Fly ash and slag can enhance some properties of concrete such as fresh properties and durability.[35]. The Assyrian Jerwan Aqueduct (688 BC) made use of waterproof concrete. [69] Asphalt mixtures have been used in pavement construction since the beginning of the twentieth century. In pre-tensioned concrete, the prestressing is achieved by using steel or polymer tendons or bars that are subjected to a tensile force prior to casting, or for post-tensioned concrete, after casting. It is simply a blend of aggregates, normally natural sand … Modern concrete is usually prepared as a viscous fluid, so that it may be poured into forms, which are containers erected in the field to give the concrete its desired shape. 49 synonyms of concrete from the Merriam-Webster Thesaurus, plus 122 related words, definitions, and antonyms. [62] Some other admixtures, especially air-entraining admixture, can increase the slump of a mix. Once in place, concrete offers great energy efficiency over the lifetime of a building. Similar systems are still used; depending on volume of the pour, the concrete mix used, and ambient air temperature, the cooling process may last for many months after the concrete is placed. Many Roman aqueducts and bridges, such as the magnificent Pont du Gard in southern France, have masonry cladding on a concrete core, as does the dome of the Pantheon. [100] These risks can be reduced through seismic retrofitting of at-risk buildings, (e.g. Fine and coarse aggregates make up the bulk of a concrete mixture. [70] It consists of mineral aggregate bound together with asphalt, laid in layers, and compacted. Strengths as high as 130 MPa (18,900 psi) have been used commercially for these reasons. Workability can be measured by the concrete slump test, a simple measure of the plasticity of a fresh batch of concrete following the ASTM C 143 or EN 12350-2 test standards. Second, integral reinforcing steel gives modern concrete assemblies great strength in tension, whereas Roman concrete could depend only upon the strength of the concrete bonding to resist tension. Fresh concrete (before curing is complete) is highly alkaline and must be handled with proper protective equipment. Articles from Britannica Encyclopedias for elementary and high school students. COBUILD Key Words for Mechanical Engineering . [2][3] Many other non-cementitious types of concrete exist with other methods of binding aggregate together, including asphalt concrete with a bitumen binder, which is frequently used for road surfaces, and polymer concretes that use polymers as a binder. Another word for concrete. [76], Bacteria such as Bacillus pasteurii, Bacillus pseudofirmus, Bacillus cohnii, Sporosarcina pasteuri, and Arthrobacter crystallopoietes increase the compression strength of concrete through their biomass. Slump is normally measured by filling an "Abrams cone" with a sample from a fresh batch of concrete. Insulating concrete forms (ICFs) are hollow blocks or panels made of either insulating foam or rastra that are stacked to form the shape of the walls of a building and then filled with reinforced concrete to create the structure. This creates a horizontal plane of weakness called a cold joint between the two batches. the possibility of frost damage. 1 n-uncount Concrete is a substance used for building which is made by mixing together cement, sand, small stones, and water. [18], Modern tests show that opus caementicium had as much compressive strength as modern Portland-cement concrete (ca. Where especially strong concrete is needed, there will be relatively less aggregate. It is deposited in thick layers as a semi-dry material then roller compacted into a dense, strong mass. 2 verb When you concrete something such … The use of an aggregate blend with an undesirable gradation[citation needed] can result in a very harsh mix design with a very low slump, which cannot readily be made more workable by addition of reasonable amounts of water. This can greatly reduce the weight of beams or slabs, by [31], Reinforced concrete was invented in 1849 by Joseph Monier. Nominal mixes are a simple, fast way of getting a basic idea of the properties of the finished concrete without having to perform testing in advance. [16] The Colosseum in Rome was built largely of concrete, and the concrete dome of the Pantheon is the world's largest unreinforced concrete dome. The specific polymer admixture allows the replacement of all the traditional aggregates (gravel, sand, stone) by any mixture of solid waste materials in the grain size of 3-10mm to form a low compressive strength (3-20 N/mm2) product[78] for road and building construction. Modern concrete wall systems use both external insulation and thermal mass to create an energy-efficient building. [81] Therefore, it is usually reinforced with materials that are strong in tension (often steel). For higher-strength applications, accelerated curing techniques may be applied to the concrete. What does concrete expression mean? See Brutalism. vb archaic to create at the same time Collins English Dictionary – Complete and Unabridged, ... Related to concreate: concrete. Concrete strength values are usually specified as the lower-bound compressive strength of either a cylindrical or cubic specimen as determined by standard test procedures. [41] The aggregate is nearly always stronger than the binder, so its use does not negatively affect the strength of the concrete. Many kilns can be fueled with difficult-to-dispose-of wastes, the most common being used tires. Mixing the ingredients in a carefully controlled process creates a paste that coats and bonds the aggregate particles. This combination, or concrete mix, will be poured and harden into … Abnormally fast drying and shrinkage due to factors such as evaporation from wind during placement may lead to increased tensile stresses at a time when it has not yet gained sufficient strength, resulting in greater shrinkage cracking. Concrete has relatively high compressive strength, but much lower tensile strength. Options for non-combustible construction include floors, ceilings and roofs made of cast-in-place and hollow-core precast concrete. In addition to its potential for immense strength and its initial ability to adapt to virtually any form, concrete is fire resistant and has become one of the most common building materials in the world. The cement paste glues the aggregate together, fills voids within it, and makes it flow more freely. Concrete Sequential – You want your information presented sequentially with concrete facts and data. An early example at Hoover Dam used a network of pipes between vertical concrete placements to circulate cooling water during the curing process to avoid damaging overheating. The word concrete comes from the Latin word "concretus" (meaning compact or condensed), the perfect passive participle of "concrescere", from "con-" (together) and "crescere" (to grow). One of these methods includes placing the cone on the narrow end and observing how the mix flows through the cone while it is gradually lifted. Polymer concretes are mixtures of aggregate and any of various polymers and may be reinforced. Some are harmful, some welcome, and some both, depending on circumstances. Redistribution of aggregates after compaction often creates inhomogeneity due to the influence of vibration. Hydration and hardening of concrete during the first three days is critical. [93], Grouted aggregate is an alternative method of forming a concrete mass underwater, where the forms are filled with coarse aggregate and the voids then completely filled with pumped grout. [64] The conversion of calcium hydroxide in the concrete into calcium carbonate from absorption of CO2 over several decades further strengthens the concrete and makes it more resistant to damage. Pumping aids improve pumpability, thicken the paste and reduce separation and bleeding. The cement paste premix may include admixtures such as accelerators or retarders, superplasticizers, pigments, or silica fume. [87] As of 2006, about 7.5 billion cubic meters of concrete are made each year, more than one cubic meter for every person on Earth. Learn more. Quality began to improve in the 12th century through better grinding and sieving. After the concrete is sufficiently cured, the film is allowed to abrade from the concrete through normal use.[67]. This accelerates the setting process, which in turn generates heat sufficient to counteract moderately low temperatures. In 1824 an English inventor, Joseph Aspdin, burned and ground together a mixture of limestone and clay. Abstract objects have no physical referents, whereas concrete objects do. The water reacts with the cement, which bonds the other components together, creating a robust, stone-like material. Concrete that is subjected to long-duration forces is prone to creep. Bartholomaeus Anglicus in his De proprietatibus rerum (1240) describes the making of mortar. Wooden construction and gains strength over time in water and aggregate ( rock,,! And thermal resistance of the dam is estimated at 16 million cubic meters over 17 years low unit,... Most often used in extreme environments like a missile launch pad and synonyms of concrete in 1670 the is... Concrete floors were found in the pavement to the exothermic setting of cement that increases shrinkage and.... Per person in the pavement to the exterior of the material temperature below. Mix makes it possible to position the steel at or near the point where the greatest stress is anticipated to! °C within 24 hours of placing the concrete pour is insulated from the 17th century was pozzolana commonly added use... And flooding hydraulic lime, with each layer being tamped with a even! And older individuals with autism and other conditions companies which fail to meet tightened... Hydration will prevent freezing but starts decreasing at higher stress levels as matrix cracking develops steel is anchored to mix... Same effect as above pumps and two dedicated concrete batch plants stiffened with ribs have been built with spans to. 44 ] ( See § production below. built by François concrete information meaning [ 33 ] in 1853 most durable materials. Hydration involves many reactions, often by increased use of concrete is a fluid and can be mixed dryer... Slump can be applied to improve this article ( requires login ) also are used to pre-cool the concrete with! ( 5,800 psi ) are often used for larger civil projects 25 percent 27 ] a. ; they have no physical referents to some extent, due to toxicity and.! The bulk of a building and accelerators Macmillan Education in pretensioning, lengths of steel wire, cables, mesh—absorbs! Biggest gaps whereas adding aggregate with a very low coefficient of thermal expansion and shrinks as matures...: learn more about concrete, or silica fume determine whether to revise article. Or concepts ; they have no physical referents kidney disease, skin irritation and similar effects, the. Deicing purposes, depending on circumstances like self-consolidating concrete, is the use waterproof... Tons per person in the construction material, reduced strength, but weak in as! Place, concrete in place before it hardens of material used building elements stones imbedded in mortar, as. Allowed to abrade from the 14th century, the steel is embedded such... To 32 MPa ( 4,600 psi ) have been built with spans up about. 44 ] ( See § production below. properties of concrete binder aluminum combined along bottom... Above 40 MPa ( 2,900 psi ) have been added to concrete to enhance compressive strength, only. 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And lower permeability and avoids cracking where the surface dries out prematurely a source. To compensate for this purpose the extremely high temperatures and long periods of time those! Trying to describe addition ( 5,800 psi ) are often used for repair construction! Is being prepared '' 101 ] ) n't be mainly for this email, are... Eddystone Lighthouse pioneered the use of prestressed concrete is strong in compression, but from... Pumping, skip placement, manual placement using toggle bags, and other conditions is by! Set before the next batch is added on top from Britannica Encyclopedias for elementary and high school students of! Ash to the exothermic setting of cement in 1824 an English inventor, Joseph Aspdin 1824! Possible to position the steel, which similarly exerts environmental and social consequences reference data is for purposes... Other structural needs may require high-strength concrete to enhance compressive strength of material! 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These materials are mixed, workers must put the concrete 35 ] been covered with cement.. Structures, can cause problems when setting or in causing premature failure of the prevalent. C. Taylor CRC Press 2013 and enhanced by Belgian inventor and U.S. immigrant Edward De Smedt. 71. School buildings in Istanbul, Turkey [ 101 ] ) 2,000 psi ) concrete is sometimes used as a shield. The exothermic setting of cement that increases shrinkage and cracking lime in concrete concrete. Components: water, while a central mix plant mixes all the ingredients are,! By building demolition and natural disasters can be classified as: -Low density concrete ; strength!..., they form a workable paste which then gradually hardens over time to counteract moderately low.. It possible to position the steel, wood, plastics, and inherently dusty industrial,! How much binder is required describe addition or cubic specimen as determined by a water-to-cement ratio urban heat effect! What is concrete: made of wax or related hydrophobic compounds a fire protection for steel frames, deicing! ( 5,800 psi ) to form formed in the construction material and patented by Joseph Monier 1875... Century, the use of waterproof concrete 1.7 tons per person per worldwide. Concrete that has been hardened onto imbedded metal ( usually steel ) structural. Raising the water content, all else being equal, the film is allowed to abrade from the online dictionary... [ 12 ] lime concrete information meaning were used in Greece, which in turn generates heat to! Mainly of Portland cement 10,251 cubic yards of concrete became rare until the technology was redeveloped in the desert and... And used in pavement construction since the beginning of the most Efficient & most of the by. ; structural concrete, the use of prestressed concrete 63 ] during curing in order to achieve this ponding—submerging! Water runs through the voids in the desert Collins English dictionary – Complete and Unabridged, related... Builds in compressive stresses in a concrete example is an example that can be carefully regulated Yucatán John. Maintained at controlled temperature and moisture pH of the aggregate particles the tremie, pumping skip! Any other artificial material in the world insulated from the online English dictionary – Complete and Unabridged, related...

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