Preparing method of nano-modified high permeability resistant concrete

Abstract

The invention relates to building material engineering, and aims at providing a preparing method of nano-modified high permeability resistant concrete. The preparing method comprises the steps of conducting dry stirring on cement, sand, gravel, fly ash, blast-furnace slag powder and silica fume, and mixing the mixture evenly; mixing a nanometer additive, a water reducing agent and water which accounts for half the weight evenly, and adding the nanometer additive, the water reducing agent and the water which accounts for half the weight into the mixture for stirring; then adding the water which accounts for the other half the weight and continuing to conducting mixing; conducting discharging, and putting the new mixture into molds; conducting maintenance according to a conventional maintenance mode after removing the molds to obtain the nano-modified high permeability resistant concrete. According to the preparing method of the nano-modified high permeability resistant concrete, the limitation of the influence of a single mineral component on the performance of the concrete is solved, through the combination of the multifunctional composition, the effect of function superposition and synergy is achieved, the composite multifunctional composition can effectively optimize the concrete structure grain composition, and by optimizing the internal pore structure of the concrete, the aim of improving the permeability resistance is achieved. The grain composition optimization is conducted on the concrete structure by utilizing the nanometer additive, the high activity and the microcrystal nuclear effect of nano-particles are given full play to at the same time, and the permeability resistance of the concrete structure is improved.

Description

technical field [0001] The invention relates to the technical field of building material engineering, in particular to a nano-modified high-impermeability concrete and a preparation method thereof. Background technique [0002] Concrete material is the most widely used building material in civil engineering construction. It has the characteristics of abundant raw materials, low price, simple production process and high compressive strength. It is widely respected in the field of construction engineering. However, due to the characteristics of its own structure, ordinary concrete only has a part of water and cement to hydrate during the hardening process, and the excess water evaporates after the concrete hardens and dries, forming a large number of tiny pores. At the same time, a certain amount of air is often mixed into the concrete during the mixing and pouring process, and it is difficult to completely remove it during the tamping process. These factors lead to the porou...

AI Technical Summary

Problems solved by technology

These factors lead to the porous state of the hardened concrete, including closed pores, interconnected capillary channels, macroscopic pores visible to the naked eye, and microscopic pores with small diameters. It can not meet the requirements for the use of concrete materials in wading projects such as ocean engineering, underground engineering and edema structure engineering, which seriously restricts the application of concrete materials.

[0003] Traditional measures to improve concrete impermeability mainly include adding air-entraining agents, reducing water-cement ratio, optimizing raw materials, ensuring construction quality, especially concrete vibration and curing, etc., but these methods have limited improvement in concrete impermeability. Therefore, it is of great practical significance to prepare a new type of high impermeability concrete.

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