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Volatile organic compounds (VOCs) volatilize in quantity during production and application of asphalt. The VOCs will not only cause environmental pollution, but also affect the properties of the pavement. Therefore, the VOCs emission from asphalt pavement is a very worthwhile concern. A brief review concerning VOCs from asphalt pavement, effect of VOCs and measures to mitigate VOCs emission is presented.

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This paper studies the pollutants released by the foaming agent used in the green and low carbon backfill material of high strength and light fluid soil, which can effectively solve the problem of “bridge jump”. The results showed that the concentrations of total volatile organic compounds, benzene, toluene + xylene and free formaldehyde in the pollutants were all within the qualified range. The concentration of non-methane total hydrocarbon in the pollutants increases with the increase of temperature. The concentration of non-methane total hydrocarbon in the pollutants is 3.90mg/m3 at 180°C, which is within the allowable range. During production and use, attention should be paid to ventilation and monitoring.

Coal gangue is a common solid waste in coal mining area, which causes great environmental pollution. Using coal gangue as filling material of highway subgrade can turn waste into treasure. In order to study the greening situation of the road section with coal gangue instead of soil as subgrade filling material, the pH and electrical conductivity (EC) were studied, The electrical conductivity (EC) and pH value of coal gangue used in a highway subgrade test section under different soaking time and initial pH solution were measured, and their change characteristics were analyzed. Both of them increased with the extension of time, and the change trend of EC was more severe. The results of correlation analysis showed that pH and EC were highly positively correlated, and the correlation coefficients were 0.7941, 0.8198 and 0.8639 at initial ph4.1, 5.2 and 6.5, respectively. On the whole, pH is proportional to EC. By mastering the change characteristics and correlation between pH and conductivity of coal gangue under different pH conditions, it can provide certain data and theoretical support for the greening research of coal gangue as subgrade filler.