Mineral fiber-modified flexible rubber concrete

Abstract

The invention relates to mineral fiber-modified flexible rubber concrete. The mineral fiber-modified flexible rubber concrete comprises rubber cement concrete, chopped basalt fiber and a dispersant methylcellulose, wherein the rubber cement concrete consists of rubber particles, cement, sand, stones, a water reducing agent and water; and the chopped basalt fiber is 0.1 to 0.5 percent of the volume of the rubber cement concrete, and the dispersant is 0.05 to 0.2 percent of the weight of the water. The concrete is applicable to road engineering, and has high compressive strength, bending tensile strength and deformability, and low modulus of elasticity.

Description

technical field [0001] The invention belongs to the technical field of civil engineering materials, and in particular relates to a mineral fiber modified rubber flexible concrete, which is suitable for road engineering. Background technique [0002] With the rapid development of my country's economy, the traffic volume of roads has increased, and the proportion of heavy transport vehicles has increased, which puts forward higher requirements for the structural strength and performance of road pavement. Although the cement concrete pavement meets this demand due to its advantages of high compressive strength, high bending and tensile strength, good temperature stability, and long service life, it also has poor crack resistance, poor impact resistance, easy cracking and driving problems. Poor stability, high noise and other shortcomings. [0003] At present, fiber is often mixed into cement concrete to improve its crack resistance and impact resistance, so as to solve the cra...

AI Technical Summary

Problems solved by technology

However, if all the steel fibers are added to the concrete, it will not only greatly increase the cost of the project, but also have the disadvantages of serious corrosion of the steel fibers and short service life of the road surface during use.

Polypropylene fiber has a unique effect on reducing the early plastic shrinkage and drying shrinkage of concrete. Although polypropylene fiber has a certain effect on improving the crack resistance of the road surface, it is not obvious enough to improve the bending resistance of the road surface.

[0004] In order to overcome the limitations of a single fiber in improving the performance of concrete, the patent application No. 03154270.0 proposes a pavement structure in which a layer of metal fibers is paved on the bottom layer of the pavement and polymer synthetic fiber concrete is paved on the upper layer. Through the superposition effect of the two fibers, Play the role of strengthening and toughening the concrete, thereby improving the mechanical properties and durability of the concrete pavement, but this pavement structure does not improve the driving comfort

[0005] In view of the large vibration and noise of driving on cement concrete roads, Chinese patent 200610023164.1 discloses a rubber concrete for vibration reduction and noise reduction. In this patent, rubber blocks with a maximum particle size of 15mm are used to replace part of the coarse aggregate. The local homogeneity of the material is reduced. When it is used as a pavement material, the rubber block at the shallow layer of the pavement is easy to cause the mortar on the upper part to be broken due to stress concentration under load. Long-term use will cause spots and pits on the pavement. Affect driving comfort, road service life is also greatly reduced

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