Composite material for building leak-stopping and its application method

Abstract

The invention provides a construction plugging composite material, which is composed of active magnesium oxide, rubber particles, water-based acrylate emulsion, water-based curing agent, magnesium bicarbonate and magnesium chloride. It has the advantages of low shrinkage rate of the consolidated material body, good water resistance, strong resistance to crack deformation, and high fault tolerance of the formula.

Description

technical field [0001] The invention belongs to the field of building materials, and in particular relates to a building leak-stopping composite material. Background technique [0002] The plugging material can solve the technical problems of repairing cracks and plugging in buildings such as concrete. The plugging agent in the construction industry is widely used, including plugging of tunnels, bridges, houses and other buildings in complex construction environments such as underground, underwater, and quicksand, water stop, emergency repair, perfusion, waterproofing, bonding, etc. [0003] Taking the transportation field as an example, tunnel engineering has become an important part of road facilities. At present, the total length of road tunnels in China has exceeded 20,000 kilometers. Whether it is a new tunnel or a tunnel that has been put into operation, tunnel lining vault void and tunnel shield water leakage are common problems that affect the quality and service l...

AI Technical Summary

Problems solved by technology

The plastic expansion rate of the micro-expansion grouting material used for tunnel lining vault belt mold grouting is 0.6-1.2%, and it has the following disadvantages: 1. The preparation method is more complicated and the cost is high

2. The use of mineral admixtures has a large loss of fluidity for 90 minutes

3. Although it has a certain degree of micro-expansion, its compressive strength, flexural strength, and bonding strength with concrete are all low, and the surplus value of bonding strength with concrete is not high, so it is difficult to predict its bonding performance with lining concrete in the later stage

It has the following disadvantages: 1. The cost of the formula of the invention is relatively expensive, which is not convenient for construction engineering application; 2. The formula contains a retarder, which makes it difficult to control the 12h strength, and it is difficult to ensure the 12h mechanical strength of the grout; 3. The performance of the embodiment In the index test results, the 7d strength is low, and the surplus value of the bonding strength with the concrete is not high, it is difficult to predict the bonding performance of the configured micro-expansion grouting material and the lining concrete in the later stage; 4. In the performance index test results of the examples, Lack of detection of the combination performance of micro-expansion grouting material and RPC grouting pipe

[0010] (1) The synergistic effect of various additives added is not good, resulting in poor long-term bonding between the plugging material and the blocked base material (concrete material or rock material)

[0011] (2) The condensation and solidification of the plugging material is usually an exothermic reaction. After condensation, the temperature drops, and the volume shrinkage easily leads to cracking of the bonding surface, which affects the plugging effect

[0012] (3) In order to achieve the purpose of shortening the setting time, some additives (such as coagulation accelerators and hardening accelerators) sacrifice the later strength of the material, resulting in internal cracks gradually appearing in the plugging material, which affects the service life

[0013] (4) The expansion agent is generally fully expanded in the plastic stage of the grouting material, and there is basically no expansion after the grouting material is hardened, and the expansion amount of the grouting material in the later stage of curing cannot be guaranteed. After curing, it is easy to expand due to heat and contract, and continue to water. Cracks are formed due to continuous shrinkage due to chemicalization and other reasons

[0015] It can be seen that the existing technology is prone to repeated leakage in the plugging of construction projects such as tunnels, underground buildings below the groundwater level, and underwater buildings, which can only treat the symptoms but not the root cause

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