Method for preparing concrete pavement brick by using recycled aggregate of construction waste

Abstract

The invention relates to a method for preparing a concrete pavement brick by using recycled aggregate of construction waste. The method is characterized in that a concrete pavement is prepared from the following raw materials in parts by weight: 60-80 parts of recycled aggregate of the construction waste, 25-35 parts of superfine 52.5 Portland cement, 10-15 parts of a gelatinizing agent, 0.5-2 parts of a superplasticizer, 0.5-2 parts of a reinforcing agent, 0.1-0.5 part of a dispersing agent and 0.1-1 part of a retarder. The quality of the concrete pavement brick is ensured by adopting the construction waste as the aggregate and adjusting the ingredients and quality of the cement and an additive; the prepared concrete pavement brick has the characteristics of high strength, good abrasive resistance, stable quality, long service life, low cost and the like; and the concrete pavement brick is prepared by adopting the construction waste as the aggregate, so that the construction waste is comprehensively utilized to turn the waste into treasure, reclamation of the construction waste is achieved, the ecological environment is improved, and the aims of protecting the environment, saving resources and achieving low-carbon economy are achieved.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a method for preparing concrete pavement bricks by using recycled construction waste aggregates. Background technique [0002] Concrete pavement bricks in the prior art use cement and stones as the main raw materials, and are processed, pressurized or other molding processes to make concrete pavement bricks of various shapes. Concrete pavement bricks are mainly used for laying urban roads, sidewalks, and city squares. Blocks, slabs, etc. for concrete pavement and ground engineering. Due to long-term exposure of pavement bricks to complex external environments, water erosion, wind corrosion, temperature changes, friction and other reasons, it is easy to make them lose their original color and aesthetics, and the construction quality cannot be guaranteed, and the use of pavement bricks number of years. [0003] With the steady development of my country's na...

AI Technical Summary

Problems solved by technology

According to statistics, my country currently produces about 1 billion tons of construction waste every year, accounting for about 30-40% of the total urban waste, and the resource utilization rate of these construction wastes is less than 5%.

One is to simply crush the construction waste and use it as backfill material, which has very low added value, and after a certain transportation distance, it has no use value due to the high transportation cost

The second is to prepare aggregates, unburned bricks or wall materials after the construction waste is crushed and screened as a whole. Since the separation of sand, clay bricks and concrete in the construction waste cannot be achieved, and the properties of these components vary greatly, the aggregate High water absorption, low strength and difficult to use, unburned bricks have high water absorption, poor durability, wall materials have low strength, poor durability

The third is to use one or two components in construction waste to prepare building materials, which cannot realize the resource utilization of all components of construction waste. In addition, there is no clear industrial technical plan for the separation of components from construction waste.

Fourth, the treatment process is incomplete and complicated, making it difficult for industrial application

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