Joint grouting concrete for bridge expansion joint area and preparation method thereof

Abstract

The invention discloses joint grouting concrete for a bridge expansion joint area. The joint grouting concrete comprises the following components in parts by weight: 1-3 parts of FERRO fibers, 2-4 parts of basalt fibers, 30-60 parts of steel fibers, 400-550 parts of cementing materials, 1000-1150 parts of basalt gravels, 650-800 parts of sand, 140-160 parts of water and 3-6 parts of additives. The invention also discloses a preparation method of the joint grouting concrete for the bridge expansion joint area. The joint grouting concrete for the bridge expansion joint area, which is disclosed by the invention, ensures that the impact energy consumption resistance of concrete is greatly enhanced under the condition that high bending resistance is provided, thereby prolonging the service life of the concrete and ensuring the driving safety.

Description

Technical field [0001] The present invention belongs to the field of road building materials technology, which involves a bridge telescopic seam seam seam concrete and its preparation methods. Background technique [0002] In order to meet the deformation requirements of the bridge deck at temperature, concrete contraction, and slow changes, the telescopic joints are usually set on the position of both end, between the beam ends and the bridge, or the hinge position of the bridge.In addition, the expansion joints are required to be parallel and perpendicular to the two directions of the bridge axis, which can be freely expanded and solid and reliable. When the vehicle is driving, it should be smooth, no jump and noise to ensure driving safety.However, the expansion joint belongs to the secondary subsidiary in the bridge structure, and the investment amount is small. In most cases, it is arranged to be rushed to construction before the project is approaching.Soon after the bridge ...

AI Technical Summary

Problems solved by technology

However, the expansion joint is a secondary subsidiary part of the bridge structure, and the investment is small. In most cases, it is arranged to be constructed hastily before the end of the project, which leads to the lack of proper maintenance of the joint filling concrete in the expansion joint area and accelerates cracking and damage. As a result, shortly after the bridge was opened to traffic, vehicle jumping will occur at the expansion joints of the bridge, and then the anchorage system will fail, and finally the entire expansion joint will be deformed and cannot be used, affecting traffic safety

In addition, the construction time is compressed in the post-maintenance treatment, and some early-stage high-strength concrete with poor durability is often used for repairs, resulting in frequent problems at the expansion joints and resulting in large economic losses

[0003] In order to improve and solve the damage caused by the repeated impact of vehicles on the anchorage area on both sides of the expansion joint, steel fiber reinforced concrete is often used instead of ordinary plain concrete to improve the bending resistance of the concrete in the anchorage area. However, due to the failure of commonly used concrete All belong to brittle failure, once cracked, the function will be basically lost, especially under the repeated impact load in the later stage, even if steel fiber reinforced concrete is used, its ability to crack and dissipate energy in the later stage is limited, and eventually the concrete in the anchorage area will soon appear. Large-scale damage; in addition, in order to ensure the improvement of the mechanical properties of concrete, high-strength steel fibers are often used to strengthen the concrete with a higher content, which may result in higher costs and the risk of steel fiber tying. Harmful to driving safety and not conducive to application