High-performance mortar capable of effectively preventing mortar cracking and preparation method

Abstract

The invention discloses high-performance mortar capable of effectively preventing mortar cracking and a preparation method. The high-performance mortar comprises the following components: cement, quartz sand, a retarder, fly ash, silica fume, mineral powder, a water reducing agent and an anti-freezing agent. The retarder is prepared from modified ardealite, and the mineral powder is low-grade magnesite; according to the invention, the mortar prepared in the invention is mixed with water to form concrete, the modified ardealite and the low-grade magnesite do not react with water, and have an expansion mechanism, so that the collapse degree of the concrete can be effectively reduced, and the problem of cracking of the concrete caused by dry shrinkage can be effectively solved; in addition, the silica fume is used as a blending agent, so that the strength and corrosion resistance of the concrete can be further improved, the low-grade magnesite and the phosphogypsum both belong to solid wastes in production and have the characteristics of sufficient quantity and difficulty in treatment, and the environment can be protected while the cost is reduced by utilizing the low-grade magnesite and the phosphogypsum.

Description

technical field [0001] The invention belongs to the field of building materials, and in particular relates to a high-performance mortar which can effectively prevent the mortar from cracking and a preparation method thereof. Background technique [0002] In the field of construction, as more and more attention is paid to the quality requirements of building construction, the performance requirements of concrete are also improved. Concrete admixtures have the characteristics of improving concrete performance, and more and more attention has been paid to engineering applications. Adaptability, proportioning, and mixing process will all affect the quality of the final concrete; for concrete, it has high slump leading to strength reduction, cracking due to drying shrinkage, short service life, poor fluidity, short setting time, and low pumpability. 1. For the problem of easy crystallization at low temperature, the corresponding admixture can be selected and prepared in a certain...

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Problems solved by technology

[0002] In the field of construction, as more and more attention is paid to the quality requirements of building construction, the performance requirements of concrete are also improved. Concrete admixtures have the characteristics of improving concrete performance, and more and more attention has been paid to engineering applications. Adaptability, proportioning, and mixing process will all affect the quality of the final concrete; for concrete, it has high slump leading to strength reduction, cracking due to drying shrinkage, short service life, poor fluidity, short setting time, and low pumpability. , The problem of easy crystallization at low temperature, the corresponding admixture can be selected, and a high-performance mortar can be provided through a certain proportion of preparation to ensure the construction quality of the project

[0003] The storage of magnesite in my country is very rich, and it is easy to produce a large amount of low-grade magnesite during the mining process. The quantity of low-grade magnesite is huge, and the processing cost is high, resulting in excessive accumulation, affecting the environment and increasing stacking costs.

[0004] Phosphogypsum is an inorganic compound, mainly solid waste in the wet phosphoric acid process. The output of phosphogypsum is huge in my country. The random discharge and accumulation of phosphogypsum seriously damages the ecological environment, not only pollutes groundwater resources, but also causes waste of land resources.

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