Preparation method of recycled aggregate concrete

Abstract

The invention discloses a preparation method of recycled aggregate concrete, and belongs to the technical field of preparation of building materials. According to the method, calcine lime is dissolvedin water during fermentation, heat release provides temperature required for fermentation, produced calcium hydroxide forms an alkaline environment in the water, silicon dioxide, the main component in rice hull ash, is transformed into silicate to be filled into holes of aggregate filter residues, and in addition, microbial respiration produces silicon dioxide during fermentation. The method hasthe advantages that firstly, produced recycled aggregate is low in porosity, and absorption to water can be reduced; secondly, as methoxyl in methoxytrimethyl silane on the surfaces of the aggregate filter residues is easy to hydrolyze and can be in reaction with ammonia gas to produce methyl ammonia alkane substance, the methyl ammonia alkane substance can perform substitution reaction with potassium ion in the rice hull ash, the recycled aggregate concrete has excellent waterproof effect, and the absorption to water by concrete is reduced, so that scaling of the recycled aggregate concrete caused by freeze thawing and weathering is reduced, the service life is prolonged, and the recycled aggregate concrete has a wide application prospect.

Description

technical field [0001] The invention discloses a method for preparing recycled aggregate concrete, which belongs to the technical field of building material preparation. Background technique [0002] Regenerated aggregate is a new type of building material that can be recycled. It is obtained by crushing waste concrete test blocks produced by building demolition, and is used to replace natural aggregate in fresh concrete. Concrete has become the most widely used building material due to its high strength, durability and low cost. However, the construction industry also discharges a large amount of waste concrete and other construction waste, accounting for about 40% of the total industrial solid waste. Such a large amount of concrete construction waste will cause great environmental problems and occupy a lot of valuable space. It is a very feasible method to use these wastes to make new building materials and realize the self-recycling of concrete materials. [0003] In r...

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Problems solved by technology

[0005] The technical problem mainly solved by the present invention is aimed at the fact that compared with conventional concrete, recycled aggregate concrete is porous and has a higher water absorption rate, and is prone to freeze-thaw and weathering, which reduces the service life. Due to the porous performance of recycled aggregate concrete, concrete The defect of low density, which reduces the strength of concrete, provides a preparation method for recycled aggregate concrete