Geopolymer water-permeable concrete brick containing biomass charcoal

Abstract

The geopolymer permeable concrete brick comprises the following raw materials: 250-350kg / m < 3 > of geopolymer cementing material, 1200-1500kg / m < 3 > of fine aggregate (containing primary aggregate and recycled aggregate, the volume ratio of the recycled aggregate is 35%-100%), and 300-500kg / m < 3 > of recycled coarse aggregate, and the main mixing ratio design parameter value ranges are as follows: the water-binder ratio is 0.24-0.42, the slurry-to-bone ratio is 1: 3.8-1: 4.7, the water-to-bone ratio is 1: 3.8-1: 4.7, and the water-to-bone ratio is 1: 1. The maximum nominal particle size of the fine aggregate is 1-5 mm, the maximum nominal particle size of the coarse aggregate is 5-10 mm, and the recycled aggregate completely has physical and mechanical properties required by pavement, is high in strength, good in wear resistance, appropriate in friction coefficient and good in durability, has multiple functions of water permeability, air permeability, permeation, sound absorption, heat preservation, moisture preservation and the like, belongs to the use of basic materials and recycled aggregates for ecological sponge city construction, and has the advantages of environmental protection, environmental protection and the like. The development and consumption of natural non-renewable resources are reduced, and the effects of reducing carbon, reducing emission, saving energy and protecting the ecological environment are exerted to a certain extent.

Description

technical field [0001] The invention relates to the technical field of permeable concrete bricks, in particular to a biochar-containing geopolymer permeable concrete brick. Background technique [0002] The pavement rate of urban ground is increasing year by year. Relevant data show that the coverage rate of urban roads in my country has reached 10% to 18%, and the coverage rate of large cities and megacities has exceeded 20%, even as high as 25%, and the coverage rate is still increasing. , due to the dense pavement materials such as asphalt concrete and cement concrete that are usually used at present, the penetration of rainwater into the ground and the evaporation of surface water are blocked, resulting in a series of environmental and social problems, such as: rainwater blocking and The concentrated discharge of rainwater causes the groundwater level to drop, which is accompanied by subsidence of foundations, retardation of plant growth, changes in soil ecology, pollution...

AI Technical Summary

Problems solved by technology

[0006] The mix ratio design of ordinary cement concrete floor (road) pavement materials usually considers the pourability, transportability, compactness and sustainability. In contrast, the mix ratio design of pervious concrete pavement materials has Additional factors that need to be considered, the bulk density, void ratio and other standard concrete design methods related to the optimization of aggregate grading in the traditional sense, cannot be directly used in the design of pervious concrete, because the void ratio of the latter is an important design parameter, instead In other words, ordinary concrete requires the smaller the porosity, the better, while pervious concrete needs sufficient porosity to ensure its hydraulic performance meets specific application requirements, which means that the material design of pervious concrete faces more challenges. On the other hand, ordinary The basic properties of concrete such as workability, drying shrinkage, and setting time are not suitable for pervious concrete. On the contrary, for pervious concrete, the acceptable performance criteria are mainly porosity, water permeability, compressive strength and flexural strength, Durability related to freeze-thaw cycles, impact load resistance and wear resistance, a reasonable mix ratio design should ensure a balanced relationship between porosity / permeability and mechanical properties, so as to meet structural requirements and hydraulic characteristics at the same time

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