Elastic epoxy plaster for tunnel segment caulking and preparation method of elastic epoxy plaster

Abstract

The invention discloses elastic epoxy plaster for tunnel segment caulking and a preparation method of the elastic epoxy plaster. The elastic epoxy plaster comprises a component A and a component B in a mass part ratio of 1: (1-1.5), the component A is composed of epoxy resin, a diluent, a thixotropic agent and the like, and the component B is composed of a curing agent, a thixotropic agent and the like. The elastic epoxy plaster provided by the invention is good in toughness, and the elongation can reach 200% or above; the bonding effect on duct piece concrete is good, the impermeability is good, the dry-state positive tensile bonding strength is larger than 2.5 MPa in a test, the wet-state positive tensile bonding strength is larger than 2.0 MPa in a test, and the impermeability grade is larger than P12 in a test when the elastic epoxy plaster is used in cooperation with concrete; the elastic epoxy plaster not only has excellent fatigue stress resistance, but also has excellent damp-heat aging resistance, and can be used for a long time in a dynamic load environment of subway operation and an underground humid environment. The elastic epoxy plaster provided by the invention is suitable for caulking sealing of tunnel segments.

Description

technical field [0001] The invention relates to the field of tunnel segment construction, and more specifically relates to an elastic epoxy mastic for tunnel segment caulking and a preparation method thereof. Background technique [0002] During shield tunneling construction, water seepage in the tunnel will cause underground engineering leakage, which will bring many hazards, such as damage to the main body of the structure, corrosion of equipment, impact on appearance, and endanger operation safety. When the shield method is adopted, the waterproof design is extremely important. The waterproof design of the shield tunnel follows the principle of "prevention first, multi-channel fortification, and comprehensive treatment". On the basis of the self-waterproofing of the segments, the waterproofing of the segment joints is particularly important. Segment seam waterproofing mainly includes elastic gasket waterproofing between segments and caulking waterproofing between adjacent...

AI Technical Summary

Problems solved by technology

For example, polysulfide rubber sealants are mostly two-component sealants. The main agent is liquid polysulfide polymer, and the curing agent is metal oxide. Although the performance of the high-elastic rubber sealing body is good, due to the large molecular weight of the liquid polysulfide polymer, the material is very viscous, and it is difficult to stir during the embedding operation, and the construction is inconvenient; although the polyurethane sealant is simple to operate and convenient to construct , but due to the underground construction, the construction environment often has high humidity, even open water and is difficult to remove. The polyurethane sealant is very sensitive to moisture, which will directly affect its bonding effect on the concrete base surface when used, and affect the long-term use of the material Sex; although the water-swellable sealant is easy to operate and construct, due to the low strength of the material itself and the poor bonding effect on the base surface, it cannot withstand water pressure and is easy to be broken through

When it comes to bonding ability, the common knowledge in the industry first thinks of epoxy materials, but it must be known that the tunnel segment is in a dynamic load environment for a long time, and conventional epoxy adhesives have poor toughness and high brittleness, and cannot be used for a long time. Be applicable

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