High-performance cement-based composite material and preparation method thereof

Abstract

The invention discloses a high-performance cement-based composite material and a preparation method thereof, and belongs to the technical field of building materials, the composite material comprises the following raw materials: water, quartz sand, fly ash, a water reducing agent, nano SiO2, cement and polyvinyl alcohol fiber; the preparation method comprises the following steps: mixing cement, fly ash and quartz sand to obtain mortar; mixing nano SiO2 with a water reducing agent, adding part of water, stirring, adding the obtained dispersion liquid into the mortar, stirring, adding the rest water, stirring, and adding polyvinyl alcohol fiber to obtain the cement-based composite material. According to the cement-based composite material disclosed by the invention, the nano SiO2 and the polyvinyl alcohol fiber in a certain proportion are simultaneously doped into the cement-based composite material, so that the performance of the cement-based composite material under the coupling action of damp and hot salts is remarkably enhanced, and the application of the cement-based composite material in hydraulic structures and ocean engineering is more facilitated.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a high-performance cement-based composite material and a preparation method thereof. Background technique [0002] With the development of marine resources, there are more and more large-scale projects built along the coast, and the structure of buildings is becoming more and more complex and the scale is getting larger and larger. However, its service environment is becoming more and more complex, and harsh environmental factors will have an adverse effect on structural performance. For example, the marine environment contains a variety of corrosive substances, such as chloride ions, magnesium ions, and sulfate radicals. Harmful ions enter the interior of the concrete through penetration, capillary, and diffusion, and combine with calcium hydroxide and aluminum hydrate in the concrete. Calcium acts to generate new salt substances, which not only destroy t...

AI Technical Summary

Problems solved by technology

The long-term exposure of the engineering structure to the humid-heat-salt coupling environment will lead to a decrease in the strength of the reinforced concrete structure, which will seriously threaten the service life and safety of the structural components.

Moreover, once the hydraulic structure or the engineering structure in the marine environment is damaged, it will need to spend a huge amount of money for maintenance or repair, which is not only a serious waste of resources, but also has a non-negligible impact on the ecological environment

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