Recycled Concrete Mechanics Performance Test Research

Since the reform and opening up, China’s construction industry is developingrapidly,concrete as a good building material is widely used in engineering, and plays anirreplaceable role, but also brought a series of environmental problems, such as: thedestruction and waste of natural resources, with a huge amount of building waste. At the sametime, the ecological environment has suffered from great damage. Therefore,howto effectively utilize two times, in the protection of ecological environment at the sametime of the construction waste, reduce excessive exploitation of natural resourceshas becomean important issue. And the recycled concrete technology is a kind of cansolve the problemeffectively.3kinds of construction waste is the main content of this paper is to researchgroup collected as basic raw materials, were recycled concrete(referred to as: RAC) andregeneration of fiber reinforced concrete (referred to as: F-RAC) study on the preparation ofbasic mechanical properties and comprehensive economic method, evaluation.(1) for the use of0,10years and40years of waste concrete processing of recycledcoarse aggregate (hereinafter referred to as0,10years and40years of recycled coarseaggregate and natural aggregate physical and mechanical performance test, analysis of the usetime of natural coarse aggregate and different recycled coarse aggregate and apparent density,water absorption and crushed value difference, the performance of recycled coarse aggregateis discussed the use of different time for physical and mechanical performance, summed upthe general law. The results showed that the various physical and mechanical properties ofrecycled coarse aggregate are no worse than natural aggregate, and with the increase of usingtime, physical and mechanical performance of recycled coarse aggregate.(2) set a total of126normal and recycled concrete block and the mechanical propertiestest, ordinary concrete is studied with different time (0,10years and40years) and different substitution rate (0%,30%,50%,70%and100%) of the recycled concrete compressivestrength, splitting tensile strength and flexural strength, etc., on the basis of experiment,analyzes the failure mechanism and the changing rule and discussed the main influencefactors. Results show that the compressive strength of recycled concrete is generally higherthan that of ordinary concrete compressive strength, splitting tensile strength is lower than theordinary concrete splitting tensile strength, flexural strength of the two basic approach.(3) design group, a total of54renewable fiber concrete block, the use of recycledcoarse aggregate for10years, the replace rate were30%and50%respectively, fiber mixedwith single anti-aging fiber mixing polypropylene three branches respectively three branchesof anti-aging, double mixing polypropylene fibers and the separation of waste tires nylon fiber,anti-aging three mixing polypropylene fibers and the separation of waste tires nylon fiber andpolypropylene fiber TANK3kinds of situation, and carries on the mechanical properties test.Results show that the regenerated fiber concrete compared with not doped fiber recycledconcrete, cube compressive strength, splitting tensile strength and flexural strength wereincreased, and the cube compressive strength increase is not obvious, but for splitting tensilestrength and flexural strength increased more obviously, especially the influence of singleanti-aging fiber mixing polypropylene three branches is most obvious.(4) the whole life cycle cost analysis method, the ordinary concrete and recycledconcrete economic cost, environmental cost and social cost of comprehensive analysis. At thesame time, using the value engineering principle, of normal concrete, recycled concrete andrecycled fiber concrete price has carried on the comprehensive evaluation. The results showthat the recycled concrete’s comprehensive cost is lower than normal concrete, recycledconcrete and recycled fiber concrete price is higher than the general and common concrete.