Environment-friendly high-performance airtight concrete and preparation method thereof

Abstract

The invention discloses environment-friendly high-performance airtight concrete and a preparation method thereof. The concrete is prepared from the following components: 280-400 kg / m < 3 > of cement, 40-75 kg / m < 3 > of gasified ash, 25-50 kg / m < 3 > of high-titanium heavy slag powder, 20-65 kg / m < 3 > of lithium slag powder, 0.04-0.9 kg / m < 3 > of an anti-agglomeration agent, 5-10 kg / m < 3 > of a modified polycarboxylate superplasticizer, 700-900 kg / m < 3 > of sand, 1000-1200 kg / m < 3 > of gravel and 150-180 kg / m < 3 > of water. By using the industrial solid waste, the anti-agglomeration agent and the like, the compactness and compactness of the airtight concrete are improved the air permeability coefficient is reduced, the environment-friendly high-performance airtight concrete is obtained, and waste utilization is achieved. The environment-friendly high-performance airtight concrete does not contain high-pollution toxic components, has good environmental benefits and economic benefits, and overcomes the defects of the existing airtight concrete preparation technology.

Description

technical field [0001] The invention relates to the technical field of concrete, in particular to an environment-friendly high-performance airtight concrete and a preparation method thereof. Background technique [0002] Airtight concrete refers to the infiltration of a certain amount of airtight agent in concrete construction to improve the airtightness of concrete, improve the compactness of concrete, anti-crack and anti-seepage performance, compensate for the shrinkage of concrete, and enhance the waterproof and anti-seepage effect of concrete . It is mostly used in highway and railway tunnel projects passing through coal seam rock mass containing gas to prevent serious threats to the life safety of tunnel excavation engineers and users, and is also used in projects with high waterproof requirements. [0003] There are currently existing problems in the preparation of airtight concrete. First, due to the use of silica fume, fly ash and ground blast furnace slag powder as...

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Problems solved by technology

[0003] There are currently existing problems in the preparation of airtight concrete. First, due to the use of silica fume, fly ash and ground blast furnace slag powder as admixtures, and the use of special airtight materials such as airtight agents, the production of airtight concrete higher cost

Second, use the method of "eliminating first and then introducing" to eliminate the original bubbles in the matrix and then introduce specific closed bubbles to block the gas channel and reduce the air permeability coefficient. This method controls the quality and proportion of defoamers, air-entraining agents, etc. The requirements are strict, and the pump pressure during pumping construction will affect the actual effect of foam induction, and it is difficult to control the final air tightness of the concrete structure

This patented technology mainly uses fly ash and finely ground mineral powder as admixtures to improve the compactness, and its use cost is relatively high. There are certain defects in the use of special air-entraining agents to further improve the airtightness of concrete. This patented technology uses Introduce closed air bubbles to block the passage of gas or liquid in capillary pores and gel pores, but it is difficult to ensure that 100% of the introduced pores are closed pores in the actual application process, and the possible connected pores will increase the porosity, increase the The air permeability coefficient cannot achieve the effect of improving the compactness of concrete

Secondly, since the current concrete pouring methods basically adopt pumping construction, the bubbles introduced by the air-entraining agent will defoam under the pumping pressure, and the bubbles used to block the passage of gas in the actual poured concrete structure will be very large. During the pumping process, several independently closed air bubbles may gather together to form large interconnected air bubbles, making the air permeability coefficient of the actual poured concrete structure larger

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