Composite reinforced all-recycled brick aggregate concrete as well as optimization method and preparation method thereof

Abstract

The invention relates to the technical industry related to energy conservation, environmental protection and new materials, and particularly discloses an optimization method for full-recycled brick aggregate concrete under the coupling action of volcanic ash activity enhancement and hybrid fiber enhancement, which comprises the following steps: firstly, carrying out chemical enhancement optimization on recycled brick aggregate to promote the effective active components of the recycled brick aggregate to react with Ca (OH) 2 to generate C-S-H gel; the compactness of the C-S-H gel is improved, the variety of the C-S-H gel is improved, the primary hydration rate of cement clinker in a certain range of the recycled brick aggregate is improved, and secondary hydration of the cement clinker is promoted; the recycled brick aggregate is further physically enhanced and optimized, and hybrid fibers of different materials and specifications are specifically selected to enhance the concrete in different dimensions. According to the optimization method and the corresponding concrete mix proportion, the defects of the all-recycled brick aggregate concrete are comprehensively improved, the performance of the all-recycled brick aggregate concrete is improved, resource utilization of the building waste sintered clay bricks is achieved, the comprehensive utilization rate of cement is remarkably increased, and the performance of the cement is fully exerted.

Description

technical field [0001] The invention relates to energy-saving, environmental protection and new material-related technology industries, in particular to composite reinforced fully recycled brick aggregate concrete and its performance optimization and preparation process. Background technique [0002] According to statistics, my country's construction waste production basically accounts for about 40% of the total urban waste. Every demolition of 10,000 square meters of old buildings will generate 7,000 to 12,000 tons of construction waste. According to estimates, by 2025, the annual construction waste will exceed 2.2 billion tons. Due to the imbalance of my country's economic development in the early stage, fired clay bricks have become the main component of construction waste, and its proportion is maintained at about 30% to 40%. [0003] It is an exploration of resource utilization to prepare recycled brick-aggregate concrete by crushing waste fired clay bricks. However, ...

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Problems solved by technology

Based on the relevant literature and previous test results, it can be seen that the fully recycled brick aggregate concrete has the following main disadvantages: (1) The strength of the fully recycled brick aggregate concrete is relatively low (the general strength is C15-C25), which limits its application in the engineering field , thus severely restricting the resource utilization of waste fired clay bricks; (2) the fully recycled brick aggregate concrete has a large shrinkage rate and is easy to crack; (3) the comprehensive utilization rate of cement in fully recycled brick aggregate concrete is low, generally only Once the hydration reaction occurs, it will be basically terminated, resulting in the cement strength and performance not being fully exerted; (4) There are relatively few studies on the pozzolanic active components of recycled brick aggregates and their hydration performance. In order to fully understand its impact on concrete (5) The existing ordinary concrete mix ratio design method does not consider the pozzolan characteristics and its influence of recycled brick aggregates, and the applicability is poor

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