High-strength anti-crack concrete and preparation process thereof

Abstract

The invention relates to the field of concrete, and particularly discloses high-strength anti-crack concrete and a preparation process thereof. The high-strength anti-crack concrete is prepared from water, cement, recycled coarse aggregate, recycled fine aggregate, fly ash and an additive. The additive comprises 4.85-8 parts of a polycarboxylate superplasticizer, 0.8-1.6 parts of pentabromoethyl benzene, and 0.5-1.3 parts of DTPMP.Nax. The preparation method comprises the following steps: step 1, stirring the recycled fine aggregate, the cement, the fly ash and the additive together to obtaina first prepared material; step 2, adding water into the first prepared material, and performing stirring to obtain a second prepared material; and step 3, adding the recycled coarse aggregate into the second prepared material, and performing stirring to obtain the high-strength anti-crack concrete. The high-strength anti-crack concrete disclosed by the invention can be used in infrastructure construction and has the advantages of excellent anti-crack strength and compressive strength; and in addition, the preparation method disclosed by the invention has the advantage that the concrete has better crack resistance and compressive strength.

Description

technical field [0001] The application relates to the field of concrete, more specifically, it relates to a high-strength crack-resistant concrete and its preparation process. Background technique [0002] With the progress and development of society, concrete materials play an important role. With the rapid growth of usage, it has become the most widely used infrastructure material in the world. While concrete has brought changes to our lives, it has also caused a series of problems. , a large amount of natural materials are consumed in the preparation of concrete: sand, stone, water and other natural resources, which have caused great damage to the environment, and now the replacement speed of new and old buildings is getting faster, and a large number of old construction wastes are emerging. Therefore, how to Reusing old construction waste not only saves resources, but also protects the environment. [0003] With further research on construction waste, recycled concrete ...

AI Technical Summary

Problems solved by technology

[0004] However, compared with natural aggregates, recycled aggregates have a large porosity, and a large number of cracks are often generated inside during the crushing process, making recycled concrete easier to crack, and the strength of recycled aggregates is not high. These factors give recycled concrete The crack resistance and compression resistance of the new problems have seriously restricted the wide application of recycled aggregates in engineering.

[0005] In recent years, more and more researches have been done on recycled concrete. Due to the large number of pores in recycled concrete, there is a relatively weak bonding area between mortars, so that recycled concrete cannot be well bonded together. The current related technologies By adjusting the replacement rate of recycled aggregates, adding water glass, bonding resin, etc. to improve the cohesion between mortars to improve the compressive strength and cracking strength, but it is not possible to use recycled aggregates to prepare recycled concrete with qualified strength. , so there is room for improvement

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