Fast hardening early strength concrete for overall width repair of cement concrete pavement

Abstract

The invention relates to a fast hardening early strength concrete for overall width repair of a cement concrete pavement. The fast hardening early strength concrete is prepared from the following raw materials in parts by weight: 450-480 parts of cement, 620-660 parts of medium sand, 1120-1140 parts of macadam, 140-160 parts of water and 4-6 parts of additive. The fast hardening early strength concrete has the beneficial effects that (1) the fact repair material for the cement concrete pavement, provided by the invention, has the characteristics of high early strength, high overall width repair speed for the damaged cement concrete pavement, capability of realizing clear road within 24h, convenience for realizing favorable traffic conditions, good working performance and the like; and (2) the cement, the medium sand, the macadam and the additive adopted by the invention are all common base materials on the market, and special materials which have a fast hardening early strength effect, but are high in cost and are not widely applied are not adopted, so that the fast hardening early strength concrete can be favorably popularized and applied in a large scale, and the maintenance and repair cost is reduced.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a rapid-hardening and early-strength concrete for full-thickness repair of cement concrete pavement. Background technique [0002] At present, cement concrete pavement is a pavement structure with high strength, high rigidity, strong diffusion load capacity, good stability and long service life. It has been widely used in my country. By the end of 2011, the cement concrete pavement in my country has reached 1.5121 million kilometers . Despite the many advantages of cement concrete pavements, once damaged, repair work is also very difficult. In the maintenance and repair project of local damage to cement concrete pavement, in order to reduce the impact on traffic and realize rapid opening to traffic, the current rapid repair technology and methods of cement concrete pavement mainly include prefabricated assembly technology and special materials such as special cement an...

AI Technical Summary

Problems solved by technology

For example, the prefabricated assembly technology is suitable for large-scale and large-area pavement maintenance, but it is not economical and practical for small-scale and local pavement damage, and there are problems of flatness and load transfer between panels; special materials or special reinforcing agents are used. It can meet the design strength requirements of the pavement in a relatively short period of time and resume traffic. However, due to the limited selection of raw materials, it is not conducive to large-scale promotion and application; at the same time, due to the high cost of special materials and relatively poor economic efficiency, it is not suitable for road maintenance. Management unit for maintenance of large areas across the entire line

It can be seen that the current full-thickness cement concrete pavement repair and maintenance method can no longer meet the increasingly busy traffic needs, and there is an urgent need to develop a fast, efficient and practical cement concrete pavement repair technology