Rapid open-to-traffic concrete for repairing pits on cement concrete pavement

Abstract

The invention discloses rapid open-to-traffic concrete for repairing pits on a cement concrete pavement. The concrete is prepared from the following raw materials at a specific ratio: composite cement, wear-resisting medium sand, crushed stones, water, a polycarboxylic acid water reducer and a compound additive. An inorganic cement-based gel material is used for modifying so that the problems that asphalt concrete is high in repairing material cost and poor in repairing effect, the hardening speed of common cement concrete is slow, the close-to-traffic time is long and the long-term strength is decreased are solved. C2S is added into P.S42.5 cement to improve the long-term strength of the concrete; the hydration induction period and the condensation time of the cement are shortened through a compound additive so that high early strength and controllable condensation and hardening time are realized. The rapid open-to-traffic concrete can be used for repairing the pits on the cement concrete pavement, can meet rapid open-to-traffic requirements of open-to-traffic time of 2h, 5h, 12h and the like and has important value on low pavement maintenance cost and rapid open-to-traffic recovery speed.

Description

technical field [0001] The invention belongs to the technical field of maintenance and repair of cement concrete pavement, and in particular relates to a quick traffic concrete for repairing potholes of cement concrete pavement. Background technique [0002] Cement concrete pavement is the main structural form of my country's road network and highway pavement, which has the characteristics of low cost and high strength. However, with the development of the domestic economy and the increase of heavy-duty traffic, most of the concrete in operation has various diseases, and the road slab pits and grooves are one of the important types of diseases. At present, asphalt mixture is mainly used for the repair of pits and grooves. However, due to the problems of poor interface bonding and deformation inconsistency between organic materials and inorganic materials such as cement concrete, and the strong sensitivity of asphalt mixture to water , so the pits repaired with asphalt mixtu...

AI Technical Summary

Problems solved by technology

At present, asphalt mixture is mainly used for the repair of pits and grooves. However, due to the problems of poor interface bonding and deformation inconsistency between organic materials and inorganic materials such as cement concrete, and the strong sensitivity of asphalt mixture to water , so the pits repaired with asphalt mixture will be completely destroyed 3-4 months after the repair, resulting in the outstanding problems of high maintenance cost and poor repair effect; if ordinary concrete is used for repair, due to hardening time and maintenance The time is too long, and the time of causing traffic interruption is also too long