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Контрольная работа №4 для студентов ФБФО, 4 семестр (II вариант) ЗАДАНИЕ №1 Прочитайте и переведите текст в окне ниже. Aggregates
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Контрольная работа №4 для студентов ФБФО, 4 семестр (II вариант) ЗАДАНИЕ №1 Прочитайте и переведите текст в окне ниже.
Aggregates
Concrete is a mix of particles of hard material, the aggregate, bound with a paste of cement and water. At least three quarters of the volume of concrete are occupied by aggregate. Cement is generally more costly than aggregate and it is advantageous, therefore, to use as little cement as necessary to produce a dense, durable concrete.
A wet concrete mix is spread in the form of slabs and compacted into a dense mass. There is a direct relation between the density and strength of finished concrete and the ease with which concrete can be compacted. The characteristics of the aggregate play a considerable part in the ease with which concrete can be compacted. The measure of the ease with which concrete can be compacted is described as a workability of the mix. Workability is affected by the characteristics of the particles of the aggregate such as size and shape. So workability can be improved by careful selection of aggregate.
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