Composite material for maintaining and monitoring bridge concrete structure and preparation method thereof

Abstract

The invention relates to a composite material for maintaining and monitoring a bridge concrete structure and a preparation method thereof. The composite material is prepared from two components of a component A and a component B, wherein the component A is prepared from Portland cement, quartz sand, carbon fiber, mineral powder, bentonite and a water reducer; the component B is prepared from CNTs(Carbon Nano Tubes), silica fume, a dispersant, a defoamer and water. The composite material disclosed by the invention has excellent bending resistance, excellent deformation adaptability, good interfacial property and good sensitivity, is capable of realizing real-time monitoring on a structure state of a weak area and can be applied to the fields of maintaining and monitoring of bridge tunnels.

Description

technical field [0001] The invention relates to the technical field of bridge concrete structure maintenance and monitoring, in particular to a composite material used for bridge concrete structure maintenance and monitoring and a preparation method thereof. Background technique [0002] In the construction of concrete bridges, there has always been a wrong concept of emphasizing the design of structural bearing capacity and ignoring the design of service durability. In addition, the lack of effective maintenance, maintenance and monitoring of the engineering structure after the bridge is completed makes the durability of the concrete bridge structure in service problem. It is becoming more and more prominent that there are usually durability degradation problems such as corrosion of concrete steel bars, carbonization of the protective layer of steel bars, chloride ion erosion, freeze-thaw damage, etc., resulting in cracking and peeling of concrete, leaking bars and other dis...

AI Technical Summary

Problems solved by technology

[0002] In the construction of concrete bridges, there has always been a wrong concept of emphasizing the design of structural bearing capacity and ignoring the design of service durability. In addition, the lack of effective maintenance, maintenance and monitoring of the engineering structure after the bridge is completed makes the durability of the concrete bridge structure in service problem. It is becoming more and more prominent that there are usually durability degradation problems such as corrosion of concrete steel bars, carbonization of steel bar protective layers, chloride ion erosion, freeze-thaw damage, etc., resulting in cracking and peeling of concrete, leaking bars and other diseases

Up to now, there are more than 100,000 bridges in my country with insufficient safety and durability.

There is a mutual coupling relationship between bridge durability and safety, and the deterioration of structural durability will inevitably lead to a decrease in safety.

If the bridge management and maintenance unit does not pay enough attention to the durability issue, on the one hand, it will lead to a significant increase in maintenance and repair costs in the later period. On the other hand, the lack of durability will endanger the safety of the project, resulting in damage or even collapse of the bridge structure, resulting in casualties and economic losses.

[0003] At present, the maintenance technology or products in this field are not mature enough, the flexibility, collaborative deformation ability, and interface adaptability are poor, and the structure and material state after maintenance cannot be monitored in real time, resulting in a relatively short period of time after maintenance (usually 3 to 5 years) left and right), the concrete structure of the bridge is affected by external environmental factors (load stress, CO 2 , chlorine salt, water, etc.) under the repeated action, there will be different degrees of secondary durability disease, seriously affecting the performance of the bridge

Images