Modified ecological cementing nano-material and preparation method therefor

Abstract

The invention relates to a modified ecological cementing nano-material and a preparation method therefor. According to the modified ecological cementing nano-material, the water cement ratio is 0.15 to 0.35; and the modified ecological cementing nano-material contains other ingredients in percentage by mass: 35% to 55% of cement, 3% to 11% of modified silica fume, 10% to 20% of limestone flour, 30% to 40% of high-quality I-class low-calcium fly ash and 0.2% to 2% of efficient water reducing agent. Through carrying out predispersing treatment on the silica fume of the ecological nano-material, the dispersity of the ecological nano-material in a cement-based material is greatly improved, so that the micro-aggregate effect, filler effect and volcanic ash effect of the ecological nano-material are more sufficiently exerted. By adding the high-quality limestone flour, the grain size distribution is further optimized, the cohesiveness of cementing material blended slurry is effectively improved, the compactness of a hardened cementing material is improved, and the microstructure of the cementing material is improved. Meanwhile, by adding the fly ash, the fluidity and later strength of cement slurry are improved, and the microstructure of the cementing material is improved.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a preparation method of an ecological nano-modified gelling material. Background technique [0002] In the research on the modification of cement-based materials, mineral admixtures or ultra-fine powders with different particle sizes are often used to optimize the particle gradation of cement-based materials in order to form the most compact particle packing, thereby improving Harden the microstructure of cement-based materials, and then improve the physical and mechanical properties and durability of cement. Commonly used admixtures such as silica fume, fly ash, ground mineral powder, ground steel slag, limestone powder, etc. [0003] Silica fume is an ecological nanomaterial with micro-nano particles. It has good pozzolanic effect and particle filling effect, which can significantly improve the internal pore structure and compactness of cement-based materials, and si...

AI Technical Summary

Problems solved by technology

However, due to the extremely fine particles and high surface energy of silica fume, when it exists in the form of a single particle, it is in a thermodynamically unstable state, and the particles will automatically attract each other to approach and transform into a stable state. Agglomeration reduces its surface activity, leading to the complete loss of many excellent properties of micro-nano silica fume, and the actual use effect is not good. Therefore, how to eliminate the agglomeration effect between silica fume particles has always been the focus and focus of research.

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