Machine-made sand self-compaction concrete

Abstract

The invention discloses a machine-made sand self-compacting concrete. The concrete is made from the following components according to parts by weight: 100 parts of cement, 25-45 parts of fly ash, 0-30 parts of mineral powder, 0.8-1.5 parts of a polycarboxylic acid water reducing agent, 220-250 parts of machine-made sand, 130-150 parts of cobble and 130-150 parts of crushed stone. The concrete saves natural resource as well as has high fluidity, high stability and low slump loss; compared with equivalent effects, the concrete has the advantages of lower cost and simpler production, meanwhile, silicon dust is not applied to the concrete, therefore, the health of operators is better guaranteed.

Description

technical field [0001] The invention belongs to building materials, and relates to a kind of concrete used for industrial and civil buildings, in particular to a vibration-free machine-made sand self-compacting concrete. Background technique [0002] Self-compacting concrete requires that the concrete mixture has a "liquefaction" property, has good flow performance and stability performance, and does not need to be vibrated during construction. The current technology for preparing self-compacting concrete generally uses river sand, which is relatively easy to achieve "self-compacting" by taking advantage of its excellent gradation and particle shape. At present, machine-made sand has become a conventional material in ordinary concrete, and its application is relatively mature; however, compared with river sand, machine-made sand has poor particle shape and poor gradation, which often reduces the flow performance and stability of fresh concrete . However, with the continuou...

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Problems solved by technology

This invention uses silica fume, defoamer, tackifier and other components that have not been widely used in ordinary concrete at present, which effectively improves the flow performance and stability of the concrete system, but due to the special materials such as silica fume The price is relatively expensive, which makes the invention have defects such as relatively high application cost and relatively complicated production operation; at the same time, because silica fume is an ultra-fine material, people are prone to aspiration lung disease if they inhale it, which is affected by the production process of commercial concrete mixing plants. At present, artificial addition is generally used in production, which is very easy to cause bodily harm to operators

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