Lightweight self-compacting concrete and preparation method thereof

Abstract

The invention discloses lightweight self-compacting concrete comprising the components of cement, limestone powder, calcined expanded clay, sintered shale ceramic sand, an air-entraining agent, a thickener, a viscosity regulator, a water-reducing agent, and water with a ratio of (450-550): (20-70): (750-900): (100-300): (1-30): (1-30): (0.1-2): (5-15): (170-210). The invention also discloses a preparation method of the concrete. The method has the advantages that: calcined expanded clay and sintered shale ceramic sand are adopted as aggregates, and the performance of the lightweight concrete is regulated by adding the air-entraining agent, the thickener, the viscosity regulator, and the water-reducing agent, such that various working performances satisfy the requirements of self-compacting concrete. The concrete has good anti-segregation performance, excellent pumping performance, self-compacting performance, and high strength. With the viscosity regulator, the production of the lightweight self-compacting concrete is more stable and efficient. Also, natural sand is not adopted as the aggregate, such that sand and gravel mining is not involved in the production, and environment-protection significance is provided.

Description

technical field [0001] The invention relates to a lightweight concrete and a preparation method thereof, a self-compacting, high-strength lightweight concrete and a preparation method thereof. Background technique [0002] At present, with the rapid development of my country's construction industry, the requirements for special concrete are increasing day by day. Due to its own advantages of light weight, low thermal conductivity and low thermal expansion coefficient, lightweight concrete is widely used in thermal insulation, sound insulation, earthquake resistance and other projects. , due to the low weight of the structure, lightweight, high-strength concrete is considered to be an important direction for the development of concrete in the future. [0003] Due to the low density of the aggregates used in the existing lightweight concrete, and it is very easy to absorb the water in the concrete, which will cause the concrete aggregates to float, segregate, and lose too much ...

AI Technical Summary

Problems solved by technology

[0003] Due to the low aggregate density of the existing lightweight concrete, and it is easy to absorb the water in the concrete, which will cause the concrete aggregate to float, segregate, and lose the slump too quickly, resulting in poor concrete workability

At the same time, during the pumping process, due to the poor uniformity of the concrete and the high porosity of the lightweight aggregate, it is easy to cause the concrete to block the pipe under the action of the pump pressure, thereby affecting the progress of the project and causing large economic losses

In addition, the current lightweight concrete mostly uses ceramsite as the lightweight coarse aggregate and natural sand as the fine aggregate. Due to the material of ceramsite itself, the strength of the prepared concrete is low, which seriously affects its application range.

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