Study On Mechanics And Sulfate Resistance Of Pervious Concrete Made Of Waste Glass Powder

China’s urbanization is getting better and better,and while it brings convenience to life,there are also many problems,such as "heat island effect","noise pollution","urban flooding" and other phenomena.Therefore,China proposed the concept of "sponge city" in 2012.Pervious concrete is a porous lightweight concrete,with permeable water storage,sound absorption and noise reduction performance,is an important part of the sponge city pavement construction,but the unique pore structure of pervious concrete will reduce its own mechanical,durability performance,so its application is limited.China’s Jiangsu and Zhejiang regions are subject to acid rain all year round,the pervious concrete pavement in this region is at risk of sulfate erosion,so it is important to enhance the pervious concrete resistance to sulfate erosion for its application development.At present,glass products are widely used and a large amount of glass waste is produced every year,which can cause serious pollution to the environment.If waste glass powder,which is a raw material of waste glass,can be applied to pervious concrete,it can provide new ideas for glass recycling and also improve the mechanical and durability performance of pervious concrete.The main research contents and conclusions of this paper are as follows:(1)Fly ash and waste glass powder with particle sizes of 400 mesh,1000 mesh and 2000 mesh were mixed into cement cementitious sand specimens at 10%,20% and 30% of the cement mass,and liquidity,mechanical properties and volcanic ash activity tests were conducted.The mixing of 400 mesh glass powder can improve the fluidity,and 2000 mesh glass powder will reduce the fluidity;2000 mesh glass powder has the best effect on improving the compressive and flexural strength of the specimens,with a maximum increase of 5.8% and 9.3%.The specimens mixed with 2000 mesh glass powder have the highest volcanic ash activity index of 106%,which is better than the same amount of fly ash,indicating that its performance as an auxiliary cementing material is good.(2)The volume of waste glass powder with particle size of 400 mesh,1000 mesh and 2000 mesh is mixed into pervious concrete instead of cement,and the proportion of mixing is 10%,15%and 20% respectively,and the permeability performance and mechanical properties are tested.The glass powder of 400 mesh will reduce the permeability of pervious concrete,and the glass powder of2000 mesh has the best effect on the improvement of permeability at 15%;the glass powder of 400 mesh and 1000 mesh will reduce the compressive strength of pervious concrete,and the glass powder of 2000 mesh has the best effect on the improvement of later compressive and flexural strength,and its 90 d compressive strength is the highest at 10%,reaching 26.5MPa.The highest 90 d compressive strength of 26.5MPa was achieved at 10%,which was 8.2% higher than the base group.The highest 90 d flexural strength of 4.5 MPa was achieved at 10% and 15%,which was 12.5%higher than the base group.(3)Waste glass powder with a particle size of 2000 mesh was incorporated into pervious concrete and tested for sulfate erosion resistance by two erosion methods,dry and wet cycles and full immersion,supplemented by microscopic morphological tests.The specimens were more severely damaged by sulfate erosion under dry and wet cycles than under full immersion.In both erosion methods,the compressive strength corrosion resistance coefficient of pervious concrete showed a trend of increasing and then decreasing with the growth of erosion cycles.After 75 dry and wet cycles,the highest compressive strength coefficient of corrosion resistance of the specimens was reached at the glass powder dosing of 15%,which was 0.94 and increased by 4.4% compared with the reference group.This paper investigates the effect of waste glass powder on the mechanical properties and sulfate erosion resistance of pervious concrete,which is important for expanding the application of pervious concrete pavement,promoting the construction of "sponge city" and the recycling of waste glass.