Repairing material for cement concrete structure

Abstract

The invention relates to a cement concrete patching material which is prepared from mixture and water, the weight portions of the mixture include silicate cement 13-17, high efficiency water reducing agent 0.06-0.2, exciting agent 0.6-5.3, yellow sand 13-28, crushed stone 26-50, polyvinyl alcohol 0.1-0.2, fibrous material 0.4-3.3, the amount of water accounts to 5-14% of the total weight parts of the mixture.

Description

[technical field] [0001] The invention relates to a building material, in particular to a cement concrete repair material used for cement concrete structure repair materials for bonding, strengthening and repairing the defects of municipal roads, municipal administration, bridges and water conservancy projects (dams, gates) . [Background technique] [0002] Since the reform and opening up, my country's economic construction has developed rapidly, and a large number of public facilities such as roads, municipal services, bridges, and water conservancy projects have been constructed and put into use. With the increase of service life and full or overloaded use of the above-mentioned public facilities, the requirements for the integrity and safety of these facilities are getting higher and higher. Among them, the defects of cement concrete structures are caused by the limitations of design, construction, use, etc., especially structural defects will seriously affect the safety...

AI Technical Summary

Problems solved by technology

[0003] At present, the existing technology is aimed at concrete defects. First of all, as far as the cement concrete pavement is concerned, it is mainly to use ordinary cement concrete to re-pave after the entire slab is excavated, resulting in a large waste of resources, poor social impact, large environmental pollution, and maintenance time. Especially now that barrier-free construction is increasingly advocated, this method will increasingly fail to meet the needs of social development

Secondly, although ordinary cement concrete is used for some small area renovations, although it has good durability, its bond strength and early strength are low, and it requires a long curing time; at the same time, under the action of load, it is affected by the performance of ordinary cement concrete. The repair interface is easy to pull apart and fall off due to the stress concentration caused by the shrinkage of ordinary cement concrete, and cannot effectively bond with the parent concrete, so the defect reinforcement effect is not ideal

[0004] Super early strength cement concrete repair has the effect of fast setting and early strength, and requires absolute curing time, but its bond strength is low, wear resistance is poor, it is easy to fall off, the surface is worn and exposed, and it is not suitable for small-scale rescue Repair strong

In addition, many excellent organic binders are expensive and lack durability in the alkaline (PH value > 12) environment of cement concrete. The organic matter is softened by the action of water and calcium hydroxide, and the bond strength is lower. , and then under the action of water vapor and salting out, the adhesive gradually detaches, and finally completely peels off, so it is generally rarely used for cement concrete defect repair

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