Research On The Material Collection And Pavement Performance Of Old Pavement Waste Concrete

With the accelerated development of China's infrastructure construction, the old cement concrete pavement reconstruction and expansion produce a lot of waste cement concrete, the effective use of waste concrete block has become an urgent problem to be solved. Old cement concrete pavement recycling technology, is the use of old cement concrete pavement of recycled aggregate paving road, so that the road reconstruction and maintenance of waste generated in the road materials are fully utilized, To reduce old pavement reconstruction and maintenance of waste caused by environmental pollution, reduce the exploitation of the limited road building material resources, reduce the pavement engineering cost, environmental protection and conservation of resources, has very important significance for the sustainable development of highway construction.In this paper, the road of old cement concrete broken as aggregate and application in road engineering in the critical path performance research, A systematic analysis and evaluation of the physical and mechanical properties of recycled aggregate and its mixture of graded crushed stone mixture. Around both project research content, main work includes:1) Through market research of crushing equipment and site hoarding of old cement concrete slab, To formulate by cement panel regeneration scheme design. Including is mainly used for soft ground and semi-rigid base. Use of Guangxi local quota, calculate, comparison of various kinds of crushing solution, and outsourcing of gravel as verification recycling economy. Summary technical and economic index calculation results of the program, the advantages and disadvantages of various schemes are analyzed, and optimal economic plan formulation, provide feasible basis for guiding the scene of the construction.2) On the production of recycled aggregate required for crushing equipment, crushing process, as well as the crushing equipment price market research, from the perspective of the cost of a detailed analysis of the economic benefits of both. T Through selects the representative of old concrete pavement of indoor small broken, a detailed study of the material physical and mechanical properties of recycled aggregate, and specifications make the comparison and evaluation of regenerated aggregate on the pavement performance of the feasibility.3) Based on the experimental data obtained from this experiment and the data in the relevant data, the samples were prepared by the method of continuous gradation design. Compaction test, bearing ratio test, rotary compaction test and three axis shear test were carried out in the laboratory. Integrated comprehensive analysis the factors of regeneration set material effect on the mechanical properties and the obtained research results, to promote the recycling of resources and recycling, environmental protection and sustainable development, and large-scale industrial production of old concrete recycled aggregate reuse technology provides a strong technical support.4)The construction technology of recycled aggregate gradation gravel cushion is discussed in detail. Describes the graded gravel cushion occasion setting and function, in the construction process quality control and cushion performance of detection and of Liunan Expressway change extension project construction has a certain reference value.