Recycled aggregate surface treating agent and use method thereof

Abstract

The invention discloses a recycled aggregate surface treating agent and a use method thereof. The recycled aggregate surface treating agent is characterized by comprising the following components in percentage by weight: 4%-6% of acrylate, 0.2%-0.9% of peroxysulphate, 0.1%-0.5% of triethanolamine, 3%-5% of a cross-linking agent, 1%-3% of a silane coupling agent, 0.5%-1% of lignosulphonate calcium and 83.6%-91.2% of water. According to the recycled aggregate surface treating agent, the water absorption rate of recycled aggregates can be obviously decreased, and the property of an interfacial transition zone between the recycled aggregates and cement stone is improved, so that the concrete strength is improved.

Description

technical field [0001] The invention relates to the technical field of utilization of construction waste materials, in particular to a recycled aggregate surface treatment agent and a use method thereof. Background technique [0002] As one of the pillar industries of the national economy, the construction industry has developed by leaps and bounds in recent years, but the resulting construction waste is also increasing. In order to utilize these construction wastes, manufacturers crush construction wastes, screen out regenerated coarse and fine aggregates, regenerated powder, etc., and reuse them in concrete. However, the high porosity, high water absorption, low bulk density and high crushing index of recycled aggregates make recycled concrete have a certain decline in performance compared with ordinary concrete, which limits the utilization of recycled concrete to a certain extent. [0003] At present, there are mainly chemical strengthening methods and physical strength...

AI Technical Summary

Problems solved by technology

The physical strengthening method is that under the action of external load, the recycled coarse aggregate rubs against the outside world or itself, and the cement mortar on the surface is rubbed off, so as to achieve strengthening, and then the coarse aggregate is washed with water to separate the recycled aggregate. impurity, improve the quality of recycled aggregates, the above-mentioned treatment methods have more or less disadvantages in the actual treatment process, for example, Cheng Haili et al. impregnated recycled coarse aggregates with water glass solution of different concentrations, and found that this method can Improve the early compressive strength of recycled concrete, but reduce the later strength and fluidity of recycled concrete (Cheng Haili, Wang Caiyan. Experimental study on the strengthening of water glass on recycled concrete aggregates [J]. Building Gypsum and Cementitious Materials, 2004 (12) :12-14.)

Although the general mechanical grinding and crushing method can remove part of the cement stone on the surface of the recycled aggregate, it will generate a large amount of grinding again, and cause microcracks on the recycled aggregate, which will increase the water demand and reduce the strength of the recycled concrete.

Images