水泥乳化沥青砂浆微观结构演变规律研究

Microstructure Evolution Law of Cement-Emulsified Asphalt Mortar

通过EDS、SEM、NMR等试验方法,从微观形貌、水化产物、元素分布、孔隙特征等多角度对多模态数据进行深度融合分析,定性与定量地研究了水泥乳化沥青(CA)砂浆微观结构随沥灰比(A/C)和龄期的演变规律。结果表明,随着A/C增大,CA砂浆由以水泥水化产物为连续相、沥青为分散相的空间结构,转变为以沥青为连续相、水泥水化产物为分散相的疏松多孔空间结构。水泥颗粒和水化产物被沥青裹覆,严重影响了孔隙结构的发育,总孔隙率、最可几孔径逐渐增大,凝胶孔、过渡孔数量减少,大孔数量增多。随着龄期增加,水泥水化产物增多,原本较大的孔隙被分隔为较小孔隙,总孔隙率降低,大孔及毛细孔数量减少,凝胶孔及过渡孔增多,孔隙结构逐渐密实。

By means of EDS,SEM,NMR and other test methods,the multi-modal data were deeply fused and analyzed from the perspectives of microstructure,hydration products,element distribution and pore characteristics.The evolution law of cement-emulsified asphalt(CA)mortar microstructure varying with asphalt-cement ratio(A/C)and age was studied qualitatively and quantitatively.The results show that with the increase of A/C,the CA mortar changes from a spatial structure with cement hydration products as continuous phase and asphalt as dispersed phase to a loose porous spatial structure with asphalt as continuous phase and cement hydration products as dispersed phase.The cement particles and hydration products are coated by asphalt,which seriously affects the development of pore structure.The total porosity and the most probable pore size gradually increase,the number of gel pores and transition pores decreases,and the number of macropores increases.With the increase of age,the hydration products of cement increases,the original larger pores are separated into smaller pores,the total porosity and the number of macropores and capillary pores decrease,the number of gel pores and transition pores increases,and the pore structure gradually becomes dense.