Calcating-experimental method shows that on the basis of cement and fine-grounded mineral powder, complex binding materials can be obtained, providing high strength of obtained stones.
Keywords: cement, mineral powder, components, optimization, strength
The influence of fine-dispersed mineral adds on the properties of cement stone and concrete has been investigated. The possibility of production of necessary strength concrete with small sand without increasing of standard expenditure of cement has been designed.
Keywords: concrete, strength, small sand, add, mineral powder, cement, reduction, expenditure
Study the properties of rubble, produced by crushing recycled concrete. Secondary crushing of concrete products in the mass contains 20% of the grains gravel fraction 20-40 mm and 40-50% of the fraction 5-20 mm. The resulting rubble is the brand for divisibility 300-600, and its abrasion is within the A2-A4. Both indices increase with increasing grain size. To assess the grain shape of rubble offered index φs, which is the ratio of grain surface rubble to the surface of the cube of equal volume.
Keywords: concrete, crushing, gravel, crushability, wearability