Special reinforcing agent for permeable concrete and preparation method thereof

Abstract

The invention discloses a special reinforcing agent for permeable concrete and a preparation method thereof. The special reinforcing agent for the permeable concrete comprises the following ingredients in parts by weight: 40-50 parts of micro-silica fume, 1-2 parts of polyvinyl alcohol, 10-15 parts of a water-reducing agent, 30-40 parts of re-dispersible emulsion powder, and 1-2 parts of polypropylene fiber. According to the special reinforcing agent for the permeable concrete, the polypropylene fiber and the re-dispersible emulsion powder are used for enhancing strength of cement slurry as well as bond strength between the cement slurry and aggregate particles. Acetylation reaction initiates in virtue of hydroxyl radicals in the re-dispersible emulsion powder and the polypropylene fiber,so that, the polyvinyl alcohol cross-links to form a spatial reticular structure so as to promote formation of pores; and thus, permeability performance is enhanced so as to achieve the purpose of synchronously realizing high strength and permeability. Moreover, the polypropylene fiber with certain length is capable of enlarging size of the pores instead of causing blockage in the pores during formation process of the permeable concrete; and thus, mutual communication between the pores is facilitated so as to further improve permeability.

Description

technical field [0001] The invention belongs to the technical field of building materials, and particularly relates to a special reinforcing agent for permeable concrete and a preparation method thereof. Background technique [0002] Permeable concrete is a honeycomb structure with uniform distribution of pores formed by covering the surface of coarse aggregate with a thin layer of cement slurry and bonding with each other. It has the characteristics of air permeability, water permeability and light weight. Pervious concrete is a skeleton void structure, and its strength mainly depends on the strength of the cement paste between the aggregate particles and the bond strength between the cement paste and the aggregate particles. The reinforcing agent is one of the important means to improve the bond strength. [0003] The existing concrete reinforcing agent has extremely low surface tension, can quickly penetrate into the concrete, and undergo a secondary reaction with the by-...

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Problems solved by technology

[0003] The existing concrete reinforcing agent has extremely low surface tension, can quickly penetrate into the concrete, and has a secondary reaction with the by-products of cement hydration in concrete, such as calcium hydroxide, to generate a large amount of silica gel, which can Block the capillary pores inside the concrete, thereby increasing the compactness, compressive strength, hardness and wear resistance of the concrete surface, but it will cause pore blockage and reduce water permeability, so it is not suitable for pervious concrete

[0004] Generally speaking, the better the water permeability of permeable concrete, the lower the strength, and the higher the strength, the poorer the water permeability. This is mainly because the strength needs to be increased by increasing the amount of cement slurry or reducing the porosity, which leads to a decrease in the water permeability coefficient.

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