Study On The Basic Mechanical Properties And Frost Resistance Of Pervious Concrete Of Waste Glass Recycled Aggregate

Glass is widely used in daily life.Using waste glass as recycled coarse aggregate to prepare pervious concrete can not only save natural resources such as sand and stone,but also alleviate road water and urban "heat island effect".However,pervious concrete is often faced with freezing and thawing damage in winter in the process of use.In this study,waste glass was used as recycled coarse aggregate to prepare pervious concrete test blocks,and the influences of different water-cement ratios,glass aggregate replacement rate and sand rate on the permeability,basic mechanical properties and frost resistance of reclaimed pervious concrete specimens were analyzed.Based on the optimal mix ratio,a freeze-thaw environment more in line with the actual situation is proposed.The freeze-thaw resistance of glass aggregate regenerated pervious concrete under different water content is studied,and the main conclusions are as follows:(1)The primary and secondary factors affecting the water permeability of pervious concrete of glass aggregate are: water-cement ratio,sand ratio and replacement rate of recycled aggregate;When the water-cement ratio is 0.25,the water permeability is the best.(2)The substitution rate of glass aggregate has a significant impact on the compressive,folding strength and grinding resistance of recycled pervious concrete.When the substitution rate of aggregate increases from 0 to 75%,the compressive strength is reduced by 33.32%,the folding strength is reduced by 41.39%,and the grinding loss rate increases by 10.41%.(3)For 50 freeze-thaw cycles of recycled permeable concrete specimens,the effects of water-cement ratio,glass aggregate substitution rate and sand rate on mass loss rate,relative dynamic elastic modulus,compression rate and folding loss rate were analyzed.When water-cement ratio was 0.30,sand rate was 6% and reclaimed glass replacement rate was 30%,the freeze-resistance of reclaimed pervious concrete was the best.(4)By studying the frost resistance of recycled permeable concrete under different water content,the worse the frost resistance of recycled glass aggregate pervious concrete.When the water content increased from 0 to 100%,After 50 freeze-thaw cycles,the mass loss rate increased by 1.22%,the relative dynamic elastic modulus decreased by 5.43%,the relative compressive strength increased by 11.24%,and the relative antagonistic bending strength increased by 9.15%.(5)According to the test results,the loss rate of the mass,the relative elastic modulus,the compression and the loss rate of the strength were combined.