Diatomite-coal ash-silica fume modified permeable cement concrete

Abstract

The invention discloses diatomite-coal ash-silica fume modified permeable cement concrete, and belongs to the technical field of concrete. Per cubic meter of the diatomite-coal ash-silica fume modified permeable cement concrete is prepared from the raw materials: 1514 kg of coarse aggregate, 364-435 kg of cement, 12-37 kg of coal ash, 12-25 kg of silica fume, 12-37 kg of diatomite, 136-142 kg of water and 1.8-2.2 kg of water reducer. According to the permeable concrete, the diatomite, the coal ash and the silica fume are used for replacing part of cement as a cementing material, under conditions of not reducing the permeability performance, the strength of the permeable concrete is improved, the compressive strength of the permeable concrete reaches 30 MPa, the rupture strength reaches 5 MPa, a permeation coefficient reaches 4.0 mm / s, and the permeable concrete can be widely used for pavement structures of parks, sidewalks, light transportation and the like; the coal ash and the silicafume are industrial waste residues, the natural diatomite contains many impurities, the development cost is high, by applying the natural diatomite to the permeable concrete, not only can waste utilization be achieved, but also the production cost of the permeable concrete can be reduced, and the economic benefits are improved.

Description

technical field [0001] The invention belongs to the technical field of concrete, in particular to a permeable cement concrete. Background technique [0002] In the process of modern city construction, the original soil layer on the urban surface is gradually replaced by water-blocking materials such as buildings and concrete. Although roads paved with ordinary concrete and other pavement materials have brought great convenience to people's travel, However, from the perspective of the ecological environment, water-blocking materials hinder the water cycle of the environment. Because ordinary concrete materials are not water-permeable, rainwater cannot penetrate into the underlying soil to replenish groundwater. In addition, the excessive demand for urban groundwater has led to a decrease in the urban groundwater level. The lowering of the groundwater level in the city will lead to seawater backflow, which will affect the effective use of rainwater. In addition, problems such...

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Problems solved by technology

The technologies disclosed above mainly use a variety of modified materials to modify permeable concrete, which mainly has the following defects: (1) modified materials such as polymers, fibers, and emulsions need to be processed on the basis of raw materials. (2) It is difficult to achieve uniform dispersion of floc modifiers such as fibers in the existing pervious concrete mixing process, and the performance error of the prepared pervious concrete is relatively large