High-performance green water permeable brick based on facultative aerobic microorganism mineralization and preparation method

Abstract

The invention discloses a high-performance green water permeable brick based on facultative aerobic microorganism mineralization and a preparation method thereof. The high-performance green water permeable brick comprises the following components: a facultative aerobic microorganism-loaded recycled aggregate, a natural aggregate, cement, a facultative aerobic microorganism suspension, fly ash, water and calcium lactate. In the preparation process, facultative aerobic microorganisms are used as a performance reinforcing agent, and two doping modes of directly doping microorganisms and indirectly doping microorganisms by taking the recycled aggregate as a carrier are adopted. In an aerobic environment, facultative aerobic bacteria are subjected to aerobic metabolism to generate calcium carbonate precipitates to repair cracks and holes of the recycled aggregate, and a weak bonding area between the recycled aggregate and a new cement matrix is enhanced; in an anoxic environment, facultative aerobic bacteria are subjected to anaerobic metabolism to generate calcium carbonate precipitates to repair closed holes in the water permeable brick, so that the mechanical property of the water permeable brick is enhanced while no great adverse effect is generated on the water permeable performance; and the high-performance green water permeable brick with excellent mechanical property and water permeable performance is prepared from the construction waste.

Description

technical field [0001] The invention relates to the technical field of permeable bricks, in particular to a high-performance green permeable brick with good mechanical properties and high water permeability prepared based on a facultative aerobic microbial mineralization method and construction waste. Background technique [0002] In recent years, my country has attached great importance to the construction of ecological civilization and proposed the strategy of developing sponge cities for the first time in 2013. As an important means of developing the sponge city strategy, permeable bricks can effectively improve the urban ecological environment because of their unique pore structure, and make the city have good resilience in adapting to environmental changes and facing natural disasters. Its advantages are mainly manifested in the following aspects: (1) Rainwater can penetrate into the ground through the pores of permeable bricks. When the rainfall is small, it can effect...

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Problems solved by technology

[0003] At present, the large-scale promotion of permeable bricks is due to the following defects: (1) The water permeability coefficient and mechanical properties are a pair of contradictory indicators, and it is difficult to obtain permeable bricks with excellent mechanical properties and water permeability; (2) ) There are a large number of semi-connected pores and closed pores in the currently prepared permeable bricks, which have no obvious beneficial effect on the water permeability, but will significantly reduce the mechanical properties of the brick body; In cold northern regions, its frost resistance is low; (4) Most of the current performance enhancement methods of permeable bricks are expensive and difficult to popularize and apply in engineering

At present, most of the existing performance enhancement methods use materials with smaller particle sizes to fill the pores in the permeable bricks to enhance the mechanical properties of the permeable bricks. However, these strengthening methods often do not distinguish between beneficial pores and harmful pores in the permeable bricks, and the strengthening effect is too significant. , while enhancing the mechanical properties, it has a significant adverse effect on the water permeability

[0005] At present, with the modernization of our country, the acceleration of industrialization and the renovation of old urban areas and old roads, our country produces about 2 to 2.5 billion tons of construction waste every year, accounting for 40% of urban solid waste. However, the construction waste in our country Most of them are treated by open-air stacking and landfill, and the reuse rate is less than 10%, which does not meet the national sustainable development strategy requirements

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