Acid rain-resistant freezing-resistant repairing material for rail transit engineering concrete structure

Abstract

The invention provides an acid rain-resistant freezing-resistant repairing material for a rail transit engineering concrete structure. The repairing material is prepared from the following raw materials in parts by mass: 100 parts of sulphoaluminate cement, 29.5 to 37.5 parts of water, 13 to 25 parts of microbeads, 4 to 10 parts of waste rubber powder, 32 to 34 parts of quartz sand, 6 to 8 parts of quartz powder, 1.30 to 1.60 parts of polyacrylic fibers, 0.80 to 1.10 parts of a super-high-performance retarder type water reducing agent, and 0.02-0.04 part of an alkyl sodium sulfonate air entraining agent. The repairing material has the advantages of high toughness, self healing in the presence of water and resistance to acid rain and freezing, and is suitable for the concrete structure withmedium-strength dynamic load, the repairing material has a rapid setting and hardening speed, the rebound rate after spraying is very low, the integrity is good, the prepared repairing material has very high resistance to composite corrosion of the acid rain and the freezing, and the repairing material is cracked into multipoint fine cracks under stress, and has self-healing performance in wateror humid environments; and the repairing material is suitable for rapid repair of the rail transit engineering concrete structure project in acid rain, severe cold or cold areas, and has good development and application prospects.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to an acid rain freezing repair material for concrete structures of rail transit engineering. Background technique [0002] Freezing is the most common climate in cold and severely cold regions. Acid rain refers to rain, snow or other forms of precipitation with a pH less than 5.6. The corrosion of concrete by acid rain is a complex physical and chemical process that can occur spontaneously in a natural environment. Acid rain can dissolve the hardened cement on the surface of non-metallic building materials (concrete, mortar, and lime-sand bricks), causing voids and cracks to reduce the strength. Thereby damage to buildings, acid rain and freezing combined to cause more serious damage to structures. The biggest characteristic of the rail transit engineering structure is to bear the dynamic load. Under the action of alternating loads, structural repair materi...

AI Technical Summary

Problems solved by technology

In recent years, there have been many studies on the recovery ability of structures, but there are few studies on structural repair materials after acid rain and freezing composite corrosion, and organic materials are mainly used, and ultra-high performance inorganic materials are rarely used.

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