High-strength lightweight aggregate concrete and preparation method thereof

Abstract

The invention provides high-strength lightweight aggregate concrete. The concrete comprises the following raw materials in parts by weight: 350 to 550 parts of cementing material, 450 to 600 parts oflightweight fine aggregate, 500 to 650 parts of lightweight coarse aggregate, 5 to 7 parts of an additive, and 150 to 170 parts of water. The lightweight fine aggregate comprises 60 to 80 percent of fine aggregate ceramsite in mass percent, and 20 to 40 percent of active construction waste powder in mass percent; the lightweight coarse aggregate comprises the following components in mass percent:50 to 75 percent of coarse aggregate ceramsite, 10 to 30 percent of stone gangue, 10 to 20 percent of ceramic waste residue, and 3 to 8 percent of expanded graphite. The concrete reasonably utilizes the stone gangue, construction waste, urban sludge and ceramic waste residue into a gel material and aggregate, not only improves the mechanical strength and stability of the concrete, but also provides a novel approach for the reuse of solid waste, and is beneficial to energy saving and environmental pressure relieving.

Description

technical field [0001] The invention relates to the field of new building materials, in particular to a high-strength lightweight aggregate concrete and a preparation method thereof. Background technique [0002] Lightweight aggregate concrete refers to the use of lightweight aggregate, cement and water and other materials, the dry apparent density is not greater than 1950kg / m 3 of concrete. Compared with ordinary concrete, lightweight aggregate concrete has the characteristics of light weight, good seismic performance, and good heat preservation and durability. Since it was first applied in the early last century, it has made great progress after nearly a century of development. Many bridges and houses have also been built using lightweight aggregate concrete. [0003] Lightweight aggregate concrete uses lightweight aggregate with a lower density to replace ordinary coarse aggregate. This kind of lightweight aggregate often has lower cylinder compressive strength than ord...

AI Technical Summary

Problems solved by technology

However, because stone tailings have low activity and poor compatibility with other materials, it is not conducive to the stability of lightweight aggregate concrete, thus restricting its application.

[0005] The invention patent with the application number CN201010277568.X discloses an anti-seepage and anti-crack lightweight aggregate thermal insulation concrete, which uses quartz sand as the main raw material, and the prepared concrete has waterproof and anti-seepage effects, and its strength has also been improved. The stability of lightweight aggregate concrete still needs to be improved, and solid waste such as tailings is not used

The invention patent with the application number CN201410318142.2 discloses a lightweight aggregate concrete containing low-quality recycled aggregates. By adjusting the raw materials and adding specific additives, the state of the mixture can meet the requirements of use and maintain The stable state of the mixture is improved, and the workability of the concrete mixture is improved, but the strength of the concrete is not greatly improved, and it is mainly aimed at the reuse of construction waste. Further research is still needed on the reuse of stone tailings

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