High-toughness epoxy composite grouting material capable of being constructed at low temperature and preparation method thereof

Abstract

The invention relates to a high-toughness epoxy composite grouting material capable of being constructed at low temperature and a preparation method thereof. The epoxy composite grouting material comprises a component A, a component B and a component C, the component A comprises an epoxy emulsion, a styrene-butadiene emulsion and a defoaming agent; the component B comprises a curing agent, a cosolvent and water; and the component C comprises modified cement powder, a coagulant, a retarder, a powder water reducer, alkali-resistant glass flakes and quartz sand. The three components are uniformly mixed and stirred according to a certain proportion and sequence for use. The defects that an existing epoxy mortar grouting material is poor in low-temperature constructability and a common cement-based grouting material is low in early strength are overcome, a waterborne epoxy rapid curing system is combined with a special cementing material, the grouting material has the advantages of being good in groutability and rapid in hardening and early strength under the low-temperature condition, and the grouting material is safe and environmentally friendly. Meanwhile, after being hardened, the material is high in toughness and good in impact resistance and corrosion resistance, and can be widely applied to the fields of building repair and reinforcement, duct grouting, secondary grouting and the like.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a high-toughness epoxy composite grouting material capable of low-temperature construction and a preparation method thereof. Background technique [0002] The grouting material is injected into the gaps and holes of the structure under the action of its own gravity or a certain pressure. After the material solidifies and hardens, it fills the gap to improve the bearing capacity of the structure and prevent leakage. It is used in highways, bridges, tunnels, and underground structures. It has a wide range of application prospects in projects such as hydraulic structures. Cement-based grouting materials are widely used because of their simple preparation and good economy. However, ordinary cement-based grouting materials have slow hydration rate, low early strength and poor corrosion resistance under low temperature conditions. Epoxy grouting materials have high strength...

AI Technical Summary

Problems solved by technology

Cement-based grouting materials are widely used because of their simple preparation and good economy. However, ordinary cement-based grouting materials have slow hydration rate, low early strength and poor corrosion resistance under low temperature conditions.

Epoxy grouting materials have high strength, low cure shrinkage, and good corrosion resistance, but the traditional oily epoxy system is sensitive to temperature, and its viscosity increases under low temperature conditions, resulting in poor groutability. In addition, low-temperature curing agents such as mercaptans Its own viscosity is relatively high, and a large amount of diluent needs to be added, which will have an adverse effect on the strength development

[0003] Chinese patent CN202010408925.5 discloses a cement-based grouting material and its preparation method and application, through the combination of at least eleven components such as cement, silica fume, mineral powder, fine aggregate and cellulose, so that the grouting material It has good fluidity and strength, but the grouting material cannot meet the construction requirements under low temperature environment conditions

Chinese patent CN201911357869.0 discloses a low-temperature environment cement-based grouting material and its preparation method. By adjusting the ratio of Portland cement and sulfate cement, the early strength is improved, but the compressive strength is mainly considered, and the bond strength, corrosion resistance and other properties have not been considered, and there are risks such as debonding and corrosion in practical applications

However, too much diluent will affect the mechanical strength of the cured product, and the cost is high

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