| Because of its good permeability,permeable concrete is widely used in urban parks,sidewalks,parking lots and other pavement,can effectively alleviate the "flood disaster" and "heat island effect" and other problems.Due to its own structural reasons,the strength of concrete can not be compared with that of ordinary concrete,so it is difficult to popularize in practical engineering applications.At the same time,rubber production is increasing with each year in our country,and the utilization rate of waste rubber resources is low,the traditional main treatment methods mainly for incineration,landfill and other methods,will not only cause environmental pollution,but also occupy a large amount of land resources.However,rubber has the characteristics of high elasticity,good impact resistance and wear resistance.Therefore,the waste tire is ground into particles or powder and added to the concrete material,which is conducive to rubber concrete to better meet the requirements of working performance and mechanical properties.In order to better improve the mechanical properties of pervious concrete,epoxy resin was used to enhance the mechanical properties and deformation properties of waste rubber pervious concrete,and excellent pervious concrete was prepared.The main research contents of this paper are as follows:(1)The waste rubber was modified by Na OH and silane coupling agent,and the modification effect of the three methods of unmodified,Na OH modification and silane coupling agent modification was compared and observed through the hydrophilic coefficient test.The test results showed that the modification effect of silane coupling agent was the best,and the hydrophilic coefficient increased the most.The hydrophilic coefficient was increased from 0.11 to 0.82.(2)The volume method was used to calculate the amount of each material in pervious concrete,and 12 groups of mix tests were designed for the target porosity(15%,18%,20%)and water-cement ratio(0.27,0.28,0.29,0.30).The benchmark mix following this test was selected with the results of compressive strength test as reference.(3)Through the physical properties and mechanical property tests,the influence of rubber internal(20 mesh,40 mesh,60 mesh)and external doping(20 mesh,40 mesh,60 mesh)and incorporation(3%,6%,9%)on the physical and mechanical properties of modified waste rubber permeable concrete was studied.The test results show that under the premise of rubber doping,with the increase of rubber content,the compressive strength generally decreases,and the flexural strength increases first and then decreases.In the rubber content of 3% 20 mesh,the compressive strength effect is the best is 28.5MPa;when the rubber content is 6% 60 mesh,the flexural strength reaches a maximum of 3.7MPa.Under the premise of rubber external doping,the mechanical properties show a trend of first increasing and then decreasing with the increase of rubber content,and the compressive strength reaches a maximum of 30.5MPa when the rubber content is 3% 20 mesh,and the best performance of the flexural strength effect is4.0MPa when the rubber content is 6% 60 mesh.Permeable concrete and porosity have obvious deterioration effects when mixed inside and outside.(4)The epoxy resin(0,3%,5%,7%)was added to the modified waste rubber permeable concrete,and the mechanical properties were best when the dosage was 5%,and the compressive strength was 33.7MPa and 35.2MPa,the flexural strength was 3.5MPa and3.3MPa,the axial compressive strength was increased by 23.1% and 35.7%,respectively,and the axial compressive deformation performance of modified waste rubber permeable concrete was significantly improved. |
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