Cementing material based on continuous elastic-plastic expansion joints of small-span and medium-span bridges and preparation method and application thereof

Abstract

The invention discloses a cementing material based on continuous elastic-plastic expansion joints of small-span and medium-span bridges and a preparation method and application thereof. The cementing material is composed of matrix pitch, SBS (styrene butadiene styrene polymer), waste rubber powder, TOR (trans-polyoctenamer rubber) binder and aromatic hydrocarbon. The mass ratio of matrix pitch : SBS : waste rubber powder : TOR (trans-polyoctenamer rubber) binder : aromatic hydrocarbon is 100:8 to 10:15:2:3 to 5. The preparation method includes steps of mixing the waste rubber powder and TOR uniformly, then adding the mixture into the matrix pitch at the temperature of 170 DEG C to mix to form modified pitch mother liquor, adding the SBS and the aromatic hydrocarbon into the modified pitch mother liquor and mixing the same at the temperature of 180 DEG C to prepare composite modified pitch which is the cementing material based on the continuous elastic-plastic expansion joints of the small-span and medium-span bridges. The cementing material based on the continuous elastic-plastic expansion joints of the small-span and medium-span bridges is simple in preparation and applied to the small-span and medium-span bridge expansion joints and has the advantages of high comfortableness in running, high elastic recovery capability, low flexibility, fine high-temperature stability and waterproof performance, convenience in construction and repair, fast traffic opening and the like.

Description

technical field [0001] The invention relates to the technical field of road modified asphalt and a construction method of continuous elastic-plastic expansion joints. In particular, it relates to a continuous elastic-plastic expansion joint cement based on small and medium-span bridges and its preparation method and application. Background technique [0002] The continuous elastic-plastic bridge expansion device replaces a narrow range of bridge deck pavement above the expansion joint with a special high-elasticity asphalt mixture. This high-elastic special asphalt mixture can absorb the displacement of the bridge deck due to temperature and traffic load, so as to ensure that the surface layer will not be cracked and damaged. At the same time, it takes into account the opposing performance requirements of high temperature and low temperature, permeability and viscosity. It is suitable for areas with a single temperature and is suitable for areas with large temperature diffe...

AI Technical Summary

Problems solved by technology

[0003] However, factors such as heavy traffic volume, bridge structure, inadaptability of elastoplastic cementitious materials to ambient temperature, and construction quality have caused various degrees of early damage to continuous elastoplastic expansion joints. The main forms of damage are: elastic There are obvious ruts and cracks on the surface of the plastic body, washboard or partial shedding on the surface of the elastic-plastic body, partial or large-scale peeling off of the aggregate, cracks on the bridge deck at the joint with the bridge deck pavement, and gradually crack and fall off, or The bridge deck pavement is damaged within the scope of the telescopic device

These damages may cause large vehicle impact loads, deteriorate the driving conditions, and drastically reduce the service life of the bridge

On the other hand, due to the lack of effective measures to ensure the service life of the expansion device, the construction management department has to invest manpower and material resources for maintenance and replacement, which has brought a lot of negative effects on traffic and economic development