Modified-carbon-nanotube freezing-resistance-enhanced cement-based water-permeable brick

Abstract

The invention discloses a modified-carbon-nanotube freezing-resistance-enhanced cement-based water-permeable brick which is prepared from the following raw materials in parts by weight: 40-43 parts of granite scrap, 30-32 parts of waste concrete, 20-22 parts of Grade-42.5 ordinary Portland cement, 2-2.5 parts of polyester cotton fabric scrap, 0.1-0.12 part of polyepoxy chloropropane dimethylamine, 0.3-0.4 part of early-strength polycarboxylic acid water reducing agent, a right amount of water, 1.8-2.5 parts of triethanolamine, 2-3 parts of sodium sulfate, 0.7-0.8 part of cetyl trimethylammonium bromide, 8-9 parts of carbon nanotube and a right amount of deionized water. The brick disclosed by the invention solves the problems of low strength and poor freezing resistance in severe cold regions in the cement-base water-permeable brick. The prepared product has the characteristics of high strength, obvious water-permeable effect, favorable freezing resistance, wear resistance and the like, is an environment-friendly green construction material, and is especially suitable for laying ground of urban squares, business streets, sidewalks, parking lots and other urban constructions in severe cold regions.

Description

technical field [0001] The invention relates to the technical field of permeable bricks, in particular to a cement-based permeable brick with modified carbon nanotubes to enhance frost resistance. Background technique [0002] In recent years, during the rainy season, the phenomenon of "watching the sea" has occurred frequently in major cities. Permeable ground has attracted more and more attention from researchers because of its advantages of alleviating the flood discharge pressure of urban drainage systems, replenishing groundwater resources, improving the living conditions of urban surface plants and soil microorganisms, making groundwater easy to evaporate and eliminating the urban heat island effect. Permeable pavement facilitates air and moisture circulation, eliminates the heat island effect, and absorbs and reduces noise. Permeable pavement bricks are the main components of urban permeable pavement, mainly including cement-based permeable concrete bricks, polymer p...

AI Technical Summary

Problems solved by technology

[0003] In the article "Research on Optimizing the Production of Permeable Bricks Using Waste Concrete", waste concrete was used to replace natural aggregates, and the orthogonal design test method was used to analyze aggregate particle size, bone-to-cement ratio, water-cement ratio, and water reducing agent, silica fume and waste concrete. The influence of different dosages on the strength and water permeability coefficient of permeable bricks was obtained, and the optimal mix ratio was obtained. The strength of permeable bricks made with the strengthening of recycled aggregates and the improvement of curing methods was improved, which met the laying requirements and realized the waste Utilization, energy saving and emission reduction, but due to the limited increase in strength and the fluidity of concrete, slurry sinking is prone to occur when the brick body is formed, blocking the seepage channel affects water permeability, and the cement layer is due to slurry, the joints at the joints The cement layer will become thinner, which is not conducive to the development of brick strength