Self-compacting concrete prepared from concrete mixing station waste slurry

Abstract

The invention discloses self-compacting concrete prepared from concrete mixing station waste slurry.The self-compacting concrete is prepared by mixing, by weight, 270-330 parts of cement, 135-165 parts of pulverized fuel ash, 90-110 parts of the concrete mixing station waste slurry, 770-840 parts of river sand, 875-940 parts of gravels, 4.5-5.5 parts of a water reducing agent and 100-150 parts of water, wherein the concrete mixing station waste slurry is formed by precipitating concrete mixing station wastewater, the water content of the concrete mixing station waste slurry is 45%-50%, and the concrete mixing station waste slurry is generated in 24 hours.Accordingly, the self-compacting concrete is prepared from the waste slurry obtained by precipitating the concrete mixing station wastewater, therefore, the dosage of the cementing material and the water is decreased, the cost of the self-compacting concrete is greatly reduced, harmless high-additional value utilization of the concrete mixing station waste slurry is achieved, the very good environmental protection effect is achieved, and a green sustainable development road is achieved.

Description

Technical field: [0001] The invention belongs to the field of building materials, and in particular relates to a green and environment-friendly self-compacting concrete prepared from waste slurry of a concrete mixing plant. Background technique: [0002] Concrete is still the building material with the largest amount of use and the widest range of applications. It is mainly prepared and produced for concrete mixing plants, which will inevitably produce a large amount of waste water, waste slurry and waste residue. According to statistics, with the continuous expansion of the scale of infrastructure construction, the annual output of concrete in my country has exceeded 1.5 billion m 3 , and every 1m produced 3 Concrete produces an average of 0.03 tons of waste water, which means that my country's commercial concrete mixing plants will produce about 50 million tons of waste water every year. The waste water contains a certain amount of cementitious material components, which ...

AI Technical Summary

Problems solved by technology

The existing technology generally can only deal with slurry water with a concentration of 5%. In the invention patent 201210322066.3, although the concentration of the waste slurry water is increased to 10%-15%, it still does not effectively utilize the solid phase components in the waste slurry, because it is only The solid phase component is used as an inert filler, so its utilization rate is low and it cannot handle high-concentration concrete waste slurry

[0008] (2) Only ordinary C30 concrete can be prepared, and new high-performance concrete such as self-compacting concrete cannot be prepared

However, it has high requirements on the quality of concrete raw materials, and at the same time, the amount of cementitious materials is large, resulting in high cost of self-compacting concrete, which greatly limits the popularization and application of self-compacting concrete

[0011] Since self-compacting concrete has high requirements on the quality of concrete raw materials, at present, no one has studied the use of waste slurry from concrete mixing plants as raw materials to prepare self-compacting concrete.

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