Epoxy resin concrete for grouting of bridge expansion joints and road-bridge joints

Abstract

The invention provides an epoxy resin concrete for grouting bridge expansion joints and road-bridge junctions. The composition of the epoxy resin concrete includes the following raw materials in parts by weight: 70-80 parts of bisphenol A epoxy resin E51, epoxy Active toughening agent D-411 5-10 parts, glycidyl ether 5-10 parts, defoamer 0.1-0.3 parts, leveling agent 0.1-0.3 parts, coupling agent 0.1-0.3 parts, Mannisamine 20-30 parts 50-60 parts of modified aromatic amine, 40-50 parts of polyamide, 10-20 parts of 425# cement, 10-20 parts of 10-20 mesh quartz sand, 40-50 parts of 8-10 mesh quartz sand, 5- 30-40 parts of 8 mesh quartz sand, 10-20 parts of polyarylether nitrile, 5-10 parts of sorbitol ester, 5-10 parts of polyoxyethylene sorbitol ester, 5-10 parts of 10-20 mesh glass bead powder. The present invention modifies the epoxy resin and the curing agent without adding any volatile solvent, so it has low requirements on the moisture content of the sand and gravel, and is easy to operate in the construction process, without heating, non-toxic and tasteless, and has high requirements on the quality of the construction personnel. Low temperature, low requirement for construction environment temperature, easy operation, performance far exceeds the existing on-site epoxy resin concrete.

Description

technical field [0001] The invention relates to the technical field of concrete, in particular to epoxy resin concrete for grouting bridge expansion joints and road-bridge joints. Background technique [0002] With the construction of bridges, highways and high-speed railways in our country, the grouting construction of key parts such as bridge expansion joints and road-bridge connections is becoming more and more important. Concrete is a general term for engineering composite materials that bind aggregates into a whole by cementitious materials. It is a building material widely used in civil engineering. [0003] At present, epoxy resin concrete commonly used in China is prepared from epoxy resin E44 (adhesive main agent), ethylenediamine (curing agent), acetone (diluent), dibutyl ester (toughening agent) and sand and gravel. The raw materials of each component are deployed and used at the construction site. The consistency and setting time of this type of epoxy resin con...

AI Technical Summary

Problems solved by technology

[0004] 1. Epoxy resin E44 (adhesive main agent) is a high-viscosity epoxy resin, which is close to semi-solid when the temperature is lower than 15 degrees. Before use, it must be heated with an open flame or electric heating until the viscosity is low before use. , the use of open flames and electric heating will increase the risk factor and increase energy consumption

However, in field construction, the power problem is difficult to solve, and the use of generators causes waste of environmental energy and the like.

[0005] 2. Ethylenediamine is a colorless or light yellow oily or watery liquid with an ammonia-like smell

Flammable, volatile, and dangerous

[0007] 4. Dibutyl ester is an inactive toughening agent and does not react with epoxy resin. It only exists in the gap of the three-dimensional crosslinked structure of epoxy resin cured product to provide toughness. It will gradually precipitate out after a long time, resulting in surface oil painting. , and at the same time lose the toughening effect, so that the strength and toughness of the resin concrete decrease

2) Coarse and fine aggregate: In order to reduce the voids in the epoxy resin concrete and improve the compactness of the batch materials, use 5-20mm graded crushed stones for the crushed stones (the crushed stones need to be cleaned and dried before use), and clean medium Sand (the mud content of the sand must be controlled below 2%, and it can be used after sieving if necessary). The sand and gravel materials need to be dried and prepared, which is difficult to guarantee in the field environment, resulting in increased costs and quality of construction products. unqualified

[0009] The epoxy resin concrete obtained by the above formula is difficult to operate during the construction process, the toxic and volatile substances are easy to volatilize and cause environmental pollution, and the labor intensity of the workers is high. There is a serious threat to health, and the construction quality is difficult to guarantee

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