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concrete

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concrete

Building material composed of cement, stone, sand, and water. It has been used since Roman times. Since the late 19th century, it has been increasingly employed as an economical alternative to materials such as brick and wood, and has been combined with steel to increase its tension capacity.

Reinforced concrete and prestressed concrete are strengthened by combining concrete with another material, such as steel rods or glass fibres. The addition of carbon fibres to concrete increases its conductivity. The electrical resistance of the concrete changes with increased stress or fracture, so this ‘smart concrete’ can be used as an early indicator of structural damage.



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? Mentioned in ? References in classic literature
 
It was a pallid-eyed youth of eighteen in overalls who received Michael, receipted for him to the expressman, and carried his crate into a slope-floored concrete room that smelled offensively and chemically clean.
It is always some combination of effects which produces this result, and never a concrete form.
Within, a flight of concrete steps, worn hollow by centuries of use, rose before them, to disappear at a sharp turning of the passage a few yards ahead.
 
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