Experimental Study On Mechanical Properties Of Modified Concrete With Waste Plastic Granules

With the improvement of production technology, environmental pollution andecological destruction has become increasingly prominent due to the over-exploitationand waster of resources during the process of material production and utilization.Nowadays, the points of green and low-carbon sustainable development are verypopular, and then concrete has been paid much attention to as the most widely usedbuilding materials. Scientific resources exploitation of natural resources and reducethe negative environmental impact of materials, conduct research and implementationof green materials-products-a closed-loop material flow model of development ofrenewable resources, sustainable development has become inevitable. The largestamount of concrete as a building material, low-carbon environmental protection,conservation of resources and energy and green low-carbon concrete environmentalcoordination model is an important direction of development of concrete.On the other hand with the improvement of living standards and the developmentof polymer materials production technology, a wide variety of human-made polymermaterials such as plastics, rubber, glass.It is convenient to daily life also produced alot of solid waste. The traditional approach fills and incineration can pollute theenvironment, it can not achieve the goal of the recycling of waste. So researchers athome and abroad began to seek new solutions of these solid waste materials forrecycling, waste plastic can be crushed to particles so it can instead of concreteadmixtures as part of the component.Research on mechanical properties anddurability of this new concrete admixtures has been made. This study insures thatrecycled waste plastic granules as a sand-substitution aggregate in concrete is valuableto both concrete and waste plastic material.This paper summarizes a variety of new ways to achieve green concrete andthe research status waste filler as useful resource utilization, and discusses itsdevelopment and practical application of engineering. The main results are as follows:(1) The modified polypropylene (pp) waste plastic particles was grinding to a2-3.5mm dosage according to different percentages of sand instead of adding concrete,designed to replace the use of volume instead of part of the sand, the waste plasticcontent as the only linear factor from the basic mechanical properties of concrete tests.waste plastic were used as partial replacement of fine aggrate in concrete mixtures.The testing program was organized to study the effect of different proportions ofwaste plastic granules to concrete,laboratory prepared concrete mixes were tested,inwhich river sand was partially replaced by waste plastic granules in percentages of0%、2%、5%、7%、10%、15%by the weight of cementing material content. Thenthe influence of the plastic granules content on the mechanical performance ofconcrete was studied. Results show that the density of the modified concrete isreduced compared with the controlled concrete samples. The strength of concreteincreases to the maximum and then decreases with the increased content of the wasteplastic granules. But the elastic modulus becomes lower.(2) To study the ductility of waste plastic admixture concrete beams, theexperimental tests was designed to study relationship between the deflection and theapplied load of the concrete beams.Compared with the reference concrete beams toanalyze the deformation capacity of concrete beams with the introduction of wasteplastic impact. Experimental study found that compared with the reference concretebeams, adding recycled plastic granules the ductility of concrete beam get someimprovement,which is benefit for the anti-earthquake.(3) According to different percentages of sand instead of adding concrete, riversand was partially replaced by waste plastic granules in percentages of0%、5%、15%and30%by the weight of cementing material content.100xl00x515mm size,notch to height ratio of0.3,fracture tests of three-point bending beams using concreteof waste plastic granules are carried out.based on the test results,initial fracturetoughness and unstable fracture toughness are calculated. (4)When river sand was partially replaced by waste plastic granules,Plastic rawmaterial density is lower than natural sand, with a certain fluidity of freshconcrete,there is no plastic particles floating and segregation phenomenon; As therecycled content percentage increased, because the plastic is weak adsorption capacityfor water, excess water will increase the flow of concrete, cement ratio should beproperly adjusted and reduce the consumption of water.