Structure gradient type cement-based water-permeable pavement bricks and preparation method thereof

Abstract

The invention relates to structure gradient type cement-based water-permeable pavement bricks and a preparation method thereof. Each water-permeable pavement brick is composed of a bottom layer and asurface layer; the thickness of the surface layer is 2 to 15 percent of the total thickness of the water-permeable pavement brick; the bottom layer is prepared from the following components in parts by weight: 300 to 500 parts of a gel material, 1200 to 1800 parts of aggregate, 85 to 120 parts of water, 5 to 15 parts of an additive and 1 to 3 parts of fiber; the surface layer is prepared from thefollowing components in parts by weight: 300 to 500 parts of a gel material, 1200 to 1800 parts of aggregate, 85 to 120 parts of water, 5 to 15 parts of an additive and 0 to 5 parts of a coloring agent. The structure gradient type cement-based water-permeable pavement bricks provided by the invention have the advantages of high strength, good water-permeable performance, simple preparation technology and low cost.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a structurally gradient cement-based permeable pavement brick and a preparation method thereof. Background technique [0002] As a new environmentally friendly paving material, permeable pavement has high water permeability and environmental protection compared with ordinary concrete pavement. At the same time, because the permeable brick is a porous structure, the groundwater evaporates from the pores of the permeable brick, which can slow down the urban heat island effect and the urban high temperature effect, and slow down the noise pollution of the city, which can overcome the traditional concrete to a large extent. The shortcomings of the pavement. Therefore, the promotion and application of permeable pavement bricks has broad prospects. [0003] According to the production process, permeable bricks can be divided into two categories: sintered permeable bricks a...

AI Technical Summary

Problems solved by technology

Although sintered permeable bricks have high strength and good wear resistance, the production process is complicated, requiring high-temperature calcination, which consumes a lot of resources and energy, and the price is as high as more than 200 yuan / m 2

Non-fired permeable bricks are divided into two basic types: resin-bonded permeable bricks and cement-bonded permeable bricks. Resin-bonded permeable bricks generally use organic polymers such as epoxy resin as a binder. This type of permeable brick has high strength, good toughness, Good wear resistance, but this kind of permeable brick has high production cost and poor aging resistance due to the use of organic polymers as binders; cement-bonded permeable bricks have low production costs, but pure cement will The shrinkage rate is large. Under the confinement of the aggregate, a large stress difference is generated between the hardened cement paste and the aggregate interface, which is prone to micro-cracks, which reduces the bonding force between the paste and the aggregate, resulting in the late stage of the permeable brick. The compressive strength shrinks and the wear resistance is poor, which limits the popularization and application of permeable bricks to a certain extent

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