基于灰度分析的抑尘沥青混合料微宏观性能关联研究

Research on Micro-macro Performance Correlation of Dust Suppression Asphalt Mixture Based on Gray Analysis

抑尘沥青混合料能利用其表面吸附的水分捕获空气中的颗粒物,进而达到抑尘的目的。因此吸湿性能决定了其抑尘效果。为探究影响抑尘沥青混合料吸湿性能的主次因素,对以不同矿粉置换率分别掺入天然沸石粉、无水氯化钙及玉米芯粉成型的试件进行了研究。采用物理吸附仪、接触角仪及吸湿试验得到了在不同比表面积、孔总体积、平均孔径及表面自由能下的吸湿质量增重。在此基础上通过灰度分析,确定了微观因素对抑尘沥青混合料宏观吸湿性能的影响程度。结果表明:随着置换物掺量的增加,比表面积、孔总体积、平均孔径及表面自由能的值均呈上升趋势,吸湿质量增重也随之增大。通过吸湿质量增重的灰色关联计算,得到了比表面积、孔总体积、平均孔径及表面自由能与其关联度分别为0.891,0.873,0.646和0.759,说明比表面积对吸湿质量增重的影响最大,孔总体积与表面自由能次之,平均孔径对吸湿质量增重的影响最小。

The dust suppression asphalt mixture can capture the particles in the air by using the water adsorbed on its surface,so as to achieve the purpose of dust suppression.Therefore,the hygroscopicity determines the dust suppression effect.In order to explore the primary and secondary factors affecting the moisture absorption performance of dust suppression asphalt mixture,natural zeolite powder,anhydrous calcium chloride and corncob powder were respectively mixed with different replacement rate of mineral powder.The weight gain of hygroscopic mass under different specific surface area,total pore volume,average pore diameter and surface free energy was obtained by physical adsorption instrument,contact angle meter and moisture absorption test.On this basis,through gray analysis,the influence degree of micro factors on macro hygroscopicity of dust suppression asphalt mixture was determined.The results show that:with the increase of the content of the replacement,the values of the four micro factors are increasing,and the weight gain of moisture absorption is also increased.Through the grey correlation calculation of hygroscopic mass gain,the correlation degree among specific surface area,total pore volume,average pore diameter and surface free energy is 0.891,0.873,0.646 and 0.759,respectively.It shows that the specific surface area has the greatest influence on the hygroscopic mass gain,the total pore volume and surface free energy take the second place,and the average pore size has the least influence on the hygroscopic mass gain.