铝粉掺量对水泥乳化沥青胶凝材料孔形貌的影响

Effect of Content of Aluminum Powder on Pore Morphology of Cement and Emulsified-asphalt Binders

利用数码光学显微镜、扫描电子显微镜和能谱仪,研究了不同铝粉掺量的水泥乳化沥青胶凝材料(CAB)的孔形貌特征。结果表明:随着铝粉掺量的增加,CAB中的气孔逐渐增多,孔径级别逐渐多样化,主要原因为掺加的铝粉越多,其与H2O和Ca(OH)2发生的反应越激烈,产生的氢气越多,且平均气孔面积和平均气孔体积率均随铝粉掺量的增加呈指数函数增加。CAB中的大孔孔壁随铝粉掺量的增加愈发光滑,大孔与不同孔径的众多小孔连通,形成蜂窝结构,但孔壁内侧附着的水泥水化产物形貌相差较大。

The pore morphology of cement and emulsified-asphalt binders(CAB)with different contents of aluminum powder was investigated viadigital optical microscopy,scanning electron microscopy and energy dispersive spectroscopy.The results show that the air pores in CAB gradually increase and the air pore size range varies with the increase of the content of aluminum powder.The more the content of aluminum powder and the more intense the reaction among aluminum powder,H2 O and Ca(OH)2,the more the generated hydrogen will be.The average air pore area and the average air pore volume ratio increase exponentially with the increase of content of aluminum powder.The pore wall of great pores in CAB is more smooth when the content of aluminum powder increases.The great pores connect with the small pores with different apertures,forming a cellular structure.The morphology of the cement hydration products adhered to the pore wall is different.