Study On The Effect Of Concrete On The Adsorption Of Atmospheric PM2.5

PM2.5 is an important atmospheric pollutant.PM2.5 stays in the atmosphere for a long time,which not only affects climate and air quality,destroys the ecological environment,but also seriously endangers human health.Concrete is the main component of urban architecture,especially porous concrete has strong hygroscopicity.Under certain humidity conditions,PM2.5 particles as condensation nuclei can absorb the moisture in the air to form dust-containing droplets absorbed by the concrete,thereby absorbing PM2.5 particles.There are relatively few studies on the adsorption of PM2.5 specifically for the structural characteristics of concrete pores at home and abroad.There is an urgent need to develop relevant research that is consistent with the actual conditions of concrete structures.Based on the establishment of the PM2.5 simulation system,the effect of the concrete pore structure on the adsorption and diffusion behavior of PM2.5 in concrete was studied.The influence of external environmental factors on the adsorption and diffusion behavior is analyzed.Established the relationship between concrete water absorption and PM2.5 adsorption.Concrete capable of efficiently adsorbing PM2.5 was manufactured.This article has made exploratory and innovative research work in the following aspects:(1)The establishment of the PM2.5 simulation system.Design and build a PM2.5 simulation system suitable for the characteristics of concrete structures.The established simulation system can not only adj ust the concrete specimens of larger volume,but also adjust the actual parameters such as humidity,PM2.5 concentration,PM2.5 composition and temperature to meet the experimental research needs.(2)The effect of internal pore structure characteristics of concrete on the adsorption and diffusion behavior of PM2.5.Change the concrete pore structure by changing the concrete water-cement ratio and the mineral admixture.In the simulation system,the effect of concrete pore structure on PM2.5 adsorption and diffusion behavior was studied,and the mechanism of adsorption of atmospheric PM2.5 by concrete pore structure was studied.(3)Study on the influence of external environmental factors on the adsorption and diffusion behavior of PM2.5.In the simulation system,the influence of external environmental factors on the adsorption and diffusion behavior of PM2.5 was studied by changing the influence factors such as soluble ion composition,PM2.5 concentration and humidity in PM2.5.(4)Correlation between concrete water absorption and PM2.5 adsorption.The correlation between the water absorption of concrete and the adsorption of PM2.5 was studied,and the relationship between the water absorption of concrete and the adsorption of PM2.5 was established,and the adsorption of PM2.5 through the water absorption of concrete was achieved.(5)Concrete with good adsorption of PM2.5 properties was manufactured.The effects of concrete age,adsorption time and dryness on the adsorption of PM2.5 on concrete were studied.