Research On Frost Resistance And Acid Rain Resistance Of Recycled Aggregate Pervious Concrete

In this paper,the basic physical properties of recycled aggregate were measured and analyzed by experiments.By means of compressive strength test and permeability test,the influence law and mechanism of the substitution rate of recycled aggregate,water-cement ratio and mixed aggregate particle size on the compressive strength and permeability of recycled aggregate permeable concrete were studied,and the optimal mix ratio of recycled aggregate permeable concrete was determined.On this basis,the frost resistance and acid rain resistance of reclaimed aggregate pervious concrete and the improvement effect of fly ash and silica fume admixtures on its frost resistance and acid rain resistance were studied.The results show that the compressive strength of the regenerated aggregate permeable concrete decreases with the increase of the regenerated aggregate substitution rate and water-cement ratio,and then decreases with the increase of the aggregate particle size.The permeability of regenerated aggregate permeable concrete increases with the increase of regenerated aggregate substitution rate and particle size,but decreases with the increase of water-cement ratio.Both fly ash and silica fume can improve the anti-freezing performance and anti-acid rain erosion performance of the reclaimed aggregate pervious concrete to a certain extent,and the effect of silica fume is better than that of fly ash,and the mixed effect of fly ash and silica fume is better than that of fly ash alone.Target porosity was 25%,30% recycled aggregate,water cement ratio 0.3,combined aggregate particle size of 9.5-16 mm,5% dosage of fly ash,silicon ash content is 10%,the compressive strength of recycled aggregate permeable concrete can,permeable coefficient of resistance to acid rain erosion mass loss,strength loss rate of antifreezing unit surface area of exfoliation total quality and strength loss rate can satisfy the requirements of the relevant specification,can be used as a proportion of practical engineering construction.There are 82 figures,40 tables and 134 references in this paper.