A kind of joint filling concrete in bridge expansion joint area and preparation method thereof

Abstract

The invention discloses a bridge expansion joint area filling concrete, which comprises FERRO fiber, basalt fiber, steel fiber, cementitious material, basalt gravel, sand, water and admixture, and the weight components of each component are: FERRO fiber 1-3 parts, 2-4 parts of basalt fiber, 30-60 parts of steel fiber, 400-550 parts of cementitious material, 1000-1150 parts of basalt crushed stone, 650-800 parts of sand, 140-160 parts of water and admixture 3 ‑6 servings. The invention also discloses a method for preparing the joint filling concrete in the bridge expansion joint area. Under the condition that the joint-filling concrete in the expansion joint area of ​​the bridge of the present invention guarantees to provide relatively large bending resistance, the impact resistance and energy consumption capacity of the concrete is greatly improved, the service life of the concrete is prolonged, and driving safety is ensured.

Description

technical field [0001] The invention belongs to the technical field of road building materials, and in particular relates to a bridge expansion joint area joint filling concrete and a preparation method thereof. Background technique [0002] In order to meet the deformation requirements of the bridge deck in temperature, concrete shrinkage and creep, etc., the existing bridges are usually provided with expansion joints between the two girder ends, between the girder end and the abutment, or at the hinge position of the bridge. In addition, the expansion joints are required to be free to expand and contract in two directions parallel to and perpendicular to the bridge axis, firm and reliable, and the vehicles should run smoothly without sudden jumps and noises, so as to ensure driving safety. 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 o...

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