C35 self-compacting concrete adopting machine-made sand and preparation method thereof

Abstract

The invention discloses C35 self-compacting concrete adopting machine-made sand and a preparation method thereof. The concrete is obtained by mixing the following raw materials: 250-320 parts of cement, 40-80 parts of fly ash, 80 to 120 parts of mineral powder; 580 to 680 parts of machine-made sand with the fineness of 3.1 to 3.5; 160 to 250 parts of natural fine sand with the fineness of 0.5 to 0.8, 150 to 350 parts of 5 to 16mm continuously graded natural broken stone, 500 to 750 parts of 5 to 20mm continuously graded natural broken stone, 180 to 210 parts of water, and 10.0 to 12.0 parts ofa polycarboxylate water reducer. The machine-made sand can also be subjected to a modification treatment: adding a filler composition containing diatomite and talcum powder according to a weight ratio of 1: (0.02-0.1) into a polyvinyl alcohol water solution according to 100-150g/L to obtain a modifying solution A; adding a fiber composition containing basalt fibers and brucite fibers according toa weight ratio of 1: (0.01-0.08) into the polyvinyl alcohol water solution according to 50-100g/L to obtain a modifying solution B; soaking and stirring the machine-made sand in the modifying liquidA for 1-2 hours, soaking and stirring the machine-made sand in the modifying liquid B for 1-2 hours, and drying. The concrete still has good fluidity and strength on the premise that a large amount ofmachine-made sand is adopted.

Description

technical field [0001] The invention relates to the technical field of concrete, in particular to a C35 self-compacting concrete using machine-made sand and a preparation method thereof. Background technique [0002] In the process of concrete preparation, natural sand is usually used in large quantities as fine aggregate. As naturally formed sand, natural sand has a relatively regular shape, a high roundness of the grain shape, and a small surface roughness. Concrete prepared with natural sand has better compactness, which brings higher strength to concrete. [0003] With the rapid development of the construction engineering industry, the demand for concrete has greatly increased, which has led to a significant increase in the demand for natural sand. However, as a non-renewable resource, natural sand is exploited in large quantities and its storage capacity is decreasing day by day. From the perspective of long-term development, it cannot meet the needs of the rapidly de...

AI Technical Summary

Problems solved by technology

Compared with natural sand, the shape of machine-made sand is irregular, the roundness of grain shape is poorer, and the surface roughness is higher

Concrete using machine-made sand is usually less dense, resulting in poorer strength of the concrete

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