The Application of the Cold Recycled of Cement Mixture in the Repair Works of Asphalt Pavement
|Course||Road and Railway Engineering|
|Keywords||Asphalt Pavement Grass roots Semi-rigid material Cement stabilized crushed stone Cement cold recycling Composition design Road performance Major repair works Control standards|
China each year a large number of pavement restoration and improvement, will produce large amounts of waste material, recycling waste materials of the asphalt pavement, not only can reduce the demand for road building and energy saving investment, and protection of the ecological environment, in line with national economic and the overall direction of social development and the needs and requirements of sustainable development, is an energy saving technology. Therefore, the applied research, carried out the cement cold recycled aggregate has important practical significance. In this paper, recycled aggregate for cement cold objects, old asphalt pavement material regeneration program, a variety of cold regeneration characteristics and stability of the stabilizer effect analysis, select cement as a stabilizer to carry out cement cold recycled aggregates composed of design and road Performance the strength of the cement cold recycled materials formation mechanism analysis, combined with the pilot study of the mechanical strength of the cement cold recycled aggregate structure design parameter values; force state based on the typical semi-rigid asphalt pavement structure analysis, study cement cold recycled aggregate the tensile stress of the grass-roots level, and then study the cement cold renewable pellets intensity control standards, carry out the cement cold renewable aggregates in asphalt pavement overhaul project for a major overhaul of the semi-rigid asphalt pavement characteristics, and finally recycled aggregate cement cold The Base Construction technology research. The study showed that the blending ratio of the aggregate should be controlled at around 15%, cement dose of 4% -5%; the cement cold recycled aggregate characteristics in line with ordinary cement stabilized material characteristics, the strength of cement cold recycling pellets and resilient modulus is low, but stable performance, good performance of anti-erosion properties and anti-shrink, crack resistance and erosion resistance; asphalt and semi-rigid material adverse effect on the strength of the cement cold recycled materials; Cement cold regeneration pellets should be used side double indicators of unconfined compressive strength and splitting strength control; cement the cold recycled aggregates used in highway and a highway pavement subbase, when applied to the grass-roots level should be careful, can also be applied to secondary roads grassroots and tertiary roads; the cement cold renewable lime soil can be applied to the sub-base of the secondary roads and tertiary roads. The cement cold recycled materials, especially suitable for asphalt pavement overhaul project. The research has good practicality and significant economic and social benefits, and is conducive to the promotion and application of the cement cold recycled materials.