Modification method for reducing water absorption rate of recycled coarse aggregate

Abstract

The invention discloses a modification method for reducing the water absorption rate of construction waste recycled coarse aggregate. The method mainly comprises the following steps: 1) soaking and cleaning the recycled coarse aggregate in tap water, and airing; 2) placing the aggregate on a grid crawler belt and conveying to a paraffin emulsion atomization area; and 3) forming paraffin emulsion spray from the nano paraffin emulsion through atomization equipment, spraying the atomized paraffin emulsion on the surface of the aggregate in an atomization area, and naturally airing to obtain the modified aggregate. The modification method is easy to operate and good in modification effect, the water absorption rate of the construction waste recycled coarse aggregate can be effectively reduced,and the workability of a recycled concrete mixture prepared from the construction waste recycled coarse aggregate and the impermeability of hardened concrete are obviously improved.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a modification method for reducing the water absorption of recycled coarse aggregate. Background technique [0002] In recent years, with the further development of my country's urbanization process and the gradual renewal of cities, the demolition and reconstruction of original buildings in urban construction such as shed reform, roads, and bridges has produced a large amount of construction waste. However, most of the construction waste is transported to the suburbs or around the city for simple landfill or open storage without any treatment, which not only wastes land and resources, but also pollutes the environment; on the other hand, with the increasing population, The demand for sand and gravel aggregates in the construction industry continues to grow. For a long time, because sand and gravel aggregates are widely available and cheap, they are consid...

AI Technical Summary

Problems solved by technology

Although these methods have improved the performance of recycled aggregates to a certain extent, they also have shortcomings. The physical modification process is complicated, the improvement process is cumbersome, the equipment is huge, the power consumption is large, and the equipment cost is high; the chemical method is limited by the aggregate itself. The performance of additives, the optimal ratio of additive components, the optimal output, and the optimal concentration cannot be accurately determined, and production and use either fail to achieve results or cause waste of resources

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