concrete - definition. What is concrete
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%ما هو (من)٪ 1 - تعريف

COMPOSITE CONSTRUCTION MATERIAL
C20 (engineering); Concrete (material); Concrete brick; Portland concrete; Waterproof concrete; Continuous pour concrete; Concrete road; Ready mixed; Ready-mixed; Admixture (concrete); Concrete additive; Concrete mixing plant; Exposed aggregate concrete; Concreting; Concrete strength; Curing compound; Poured concrete
  • [[Boston City Hall]] (1968) is a [[Brutalist]] design constructed largely of precast and poured in place concrete.
  • City Court Building]] in [[Buffalo, New York]]
  • Concrete floor of a [[parking garage]] being placed
  • Circularity of Concrete: Cradle-to-Cradle design
  • Compression testing of a concrete cylinder
  • Birmingham]], [[Alabama]] in 1936
  • [[Concrete plant]] showing a [[concrete mixer]] being filled from ingredient silos
  • Pouring and smoothing out concrete at Palisades Park in Washington, DC
  • Recycled crushed concrete, to be reused as granular fill, is loaded into a semi-dump truck
  • A concrete slab being kept hydrated during water curing by submersion (ponding)
  • Cross section of a concrete railway sleeper below a rail
  • Decorative plate made of Nano concrete with High-Energy Mixing (HEM)
  • Crushed stone aggregate
  • A vast concrete structure – The [[Hoover Dam]]
  • ''[[Opus caementicium]]'' exposed in a characteristic Roman arch. In contrast to modern concrete structures, the concrete used in Roman buildings was usually covered with brick or stone.
  • first1=Lorraine}}</ref>
  • Interior of the Pantheon dome, seen from beneath. The concrete for the [[coffer]]ed dome was laid on moulds, mounted on temporary scaffolding.
  • archive-date=6 October 2014 }}</ref>
  • ''Pohjolatalo'', an office building made of concrete in the city center of [[Kouvola]] in [[Kymenlaakso]], [[Finland]]
  • Stylized cacti decorate a sound/retaining wall in [[Scottsdale, Arizona]]
  • [[Smeaton's Tower]]
  • Black basalt polished concrete floor
  • Several tons of bagged cement, about two minutes of output from a 10,000 ton per day [[cement kiln]]
  • Assembled tremie placing concrete underwater
  • The [[Tunkhannock Viaduct]] in northeastern Pennsylvania opened in 1915 and is still in regular use today
  • Concrete being poured into [[rebar]]
  • Taum Sauk]] (Missouri) pumped storage facility in late November 2009. After the original reservoir failed, the new reservoir was made of roller-compacted concrete.

concrete         
I. v. n.
Solidify, harden, cake, become firm or solid, be consolidated, coagulate, congeal, thicken.
II. a.
1.
Firm, solid, solidified, consolidated, compact.
2.
Concreted, formed by admixture, complex, compound, agglomerated, conglomerated.
3.
Completely real, individualized, total, entire, free from abstraction.
III. n.
1.
Concretion, mixture, compound.
2.
Cemented stones and gravel.
concrete         
¦ adjective 'k??kri:t existing in a material or physical form.
?specific; definite.
?(of a noun) denoting a material object as opposed to an abstract quality, state, or action.
¦ noun a building material made from a mixture of gravel, sand, cement, and water, forming a stone-like mass on hardening.
¦ verb
1. 'k??kri:t cover or fix solidly with concrete.
2. k?n'kri:t archaic solidify.
make real.
Derivatives
concretely adverb
concreteness noun
Origin
ME: from Fr. concret or L. concretus, past participle of concrescere 'grow together'.
concrete         
(concretes, concreting, concreted)
Frequency: The word is one of the 3000 most common words in English.
1.
Concrete is a substance used for building which is made by mixing together cement, sand, small stones, and water.
The posts have to be set in concrete...
They had lain on sleeping bags on the concrete floor.
N-UNCOUNT: oft N n
2.
When you concrete something such as a path, you cover it with concrete.
He merely cleared and concreted the floors.
VERB: V n
3.
You use concrete to indicate that something is definite and specific.
He had no concrete evidence...
I must have something to tell him. Something concrete.
ADJ: usu ADJ n
concretely
...by way of making their point more concretely.
ADV: oft ADV with cl
4.
A concrete object is a real, physical object.
...using concrete objects to teach addition and subtraction.
ADJ: usu ADJ n
5.
A concrete noun is a noun that refers to a physical object rather than to a quality or idea.
? abstract
ADJ: ADJ n
6.
If a plan or idea is set in concrete or embedded in concrete, it is fixed and cannot be changed.
As Mr Blunkett emphasised, nothing is yet set in concrete.
PHRASE: v-link PHR

ويكيبيديا

Concrete

Concrete is a composite material composed of fine and coarse aggregate bonded together with a fluid cement (cement paste) that hardens (cures) over time. Concrete is the second-most-used substance in the world after water, and is the most widely used building material. Its usage worldwide, ton for ton, is twice that of steel, wood, plastics, and aluminium combined. Globally, the ready-mix concrete industry, the largest segment of the concrete market, is projected to exceed $600 billion in revenue by 2025. This widespread use results in a number of environmental impacts. Most notably, the production process for cement produces large volumes of greenhouse gas emissions, leading to net 8% of global emissions. Other environmental concerns include widespread illegal sand mining, impacts on the surrounding environment such as increased surface runoff or urban heat island effect, and potential public health implications from toxic ingredients. Significant research and development is being done to try to reduce the emissions or make concrete a source of carbon sequestration, and increase recycled and secondary raw materials content into the mix to achieve a circular economy. Concrete is expected to be a key material for structures resilient to climate disasters, as well as a solution to mitigate the pollution of other industries, capturing wastes such as coal fly ash or bauxite tailings and residue.

When aggregate is mixed with dry Portland cement and water, the mixture forms a fluid slurry that is easily poured and molded into shape. The cement reacts with the water through a process called concrete hydration that hardens over several hours to form a hard matrix that binds the materials together into a durable stone-like material that has many uses. This time allows concrete to not only be cast in forms, but also to have a variety of tooled processes preformed. The hydration process is exothermic, which means ambient temperature plays a significant role in how long it takes concrete to set. Often, additives (such as pozzolans or superplasticizers) are included in the mixture to improve the physical properties of the wet mix, delay or accelerate the curing time, or otherwise change the finished material. Most concrete is poured with reinforcing materials (such as rebar) embedded to provide tensile strength, yielding reinforced concrete.

In the past, lime based cement binders, such as lime putty, were often used but sometimes with other hydraulic cements, (water resistant) such as a calcium aluminate cement or with Portland cement to form Portland cement concrete (named for its visual resemblance to Portland stone). 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. Concrete is distinct from mortar. Whereas concrete is itself a building material, mortar is a bonding agent that typically holds bricks, tiles and other masonry units together.

أمثلة من مجموعة نصية لـ٪ 1
1. Concrete decisions will be taken on concrete firms," he said.
2. "My understanding is what they did was mix, commingled leftover concrete with new concrete," she said.
3. More concrete evidence does exist, however, suggesting there are more concrete leads to follow.
4. Weathered firewood, concrete pipes standing on end and a concrete slab were nearby, he told authorities.
5. He examined a concrete block that was nothing other than a concrete block.