High-strength concrete adapting to humid environment and preparation method

Abstract

The invention provides high-strength concrete adapting to the humid environment and a preparation method. Cement is taken as a cementing material, gravel is taken as aggregate, the impermeability of the concrete is improved by doping a mineral additive inside or coating the surface of concrete with a waterproof material, the concrete porosity is improved by doping a hollow lightweight material, a high-quality air entraining agent and fibers, the proportion of unhydrated cement particles in early-stage concrete is reduced by doping superwater absorbent resin so as to prevent further cement hydration caused by water absorption in the later period of the high-strength concrete in the humid environment and reduce swelling stress produced by hydration products, and high durability of the high-strength concrete structure in the humid environment is realized by doping a superplasticizer. The high-strength concrete adopts a simple construction process. The high-strength concrete is mainly applied to civil engineering in the humid environment, such as high-rise building structures, large-span bridge structures, certain special structures and other concrete engineering and is particularly applicable to certain regions with potential earthquake damage.

Description

technical field [0001] The invention relates to a high-strength concrete, specifically a high-strength concrete with excellent long-term mechanical properties and durability in a humid environment. Background technique [0002] Due to its high strength and high durability, high-strength concrete is widely used in high-rise building structures, long-span bridge structures and some special structures. Due to the high strength and rigidity of the high-strength concrete structure, the section size can be reduced, thereby reducing the structure's own weight, and at the same time increasing the effective space of the house building, increasing the clearance under the bridge building or reducing the elevation of the embankment on both banks, and reducing the underground building. Rock and soil excavation volume, etc. In addition, high-strength concrete structures have better seismic performance than ordinary concrete structures. Therefore, high-durability high-strength concrete c...

AI Technical Summary

Problems solved by technology

[0003] Although high-strength concrete has many advantages as an economical civil engineering material, such as high compressive strength, high rigidity, compact interior, and small porosity, there are many unhydrated cement particles in high-strength concrete (almost 40% of the total amount of cement). %~70%), after the high-strength concrete absorbs water in a humid environment, the unhydrated cement inside will continue to hydrate, and the volume of the generated hydration product is significantly larger than the original cement volume, and the hydration product gradually fills the internal pores of the concrete; if If the reaction continues, the volume of the cement hydration product will be larger than the volume of the pores inside the concrete, thereby generating expansion stress inside the concrete, resulting in more micro-cracks in the concrete, which greatly reduces the mechanical properties and durability of the concrete; The prolongation of service time will increase the failure probability of concrete structures, especially in the event of a large-intensity earthquake, the probability of high-strength concrete structure damage will increase sharply, and bring immeasurable losses

Images