高强型CA砂浆力学性能影响因素及力学机理研究

为了解高强型CA砂浆主要组成材料对力学性能影响,研究乳化沥青与水泥质量比、砂灰比对CA砂浆强度和弹性模量的影响;并采用扫描电镜观察CA砂浆水泥沥青微观胶凝结构和CA胶浆与砂界面情况,分析CA砂浆力学性能微观机理。结果表明:随乳化沥青与水泥质量比增加,CA砂浆28d轴心抗压强度和弹性模量显著下降;随砂灰比增加,CA砂浆弹性模量无明显变化,28d轴心抗压强度开始无明显变化,之后大幅度下降;水泥沥青微观胶凝结构特征和CA胶凝材料与砂的界面黏结决定CA砂浆力学特点。因此,合适的乳化沥青与水泥比和良好流动性能是CA砂浆良好力学性能的保证。

Research on Factors Influencing Mechanical Properties of High Strength Cement Asphalt Mortar and Mechanical Mechanism

In order to understand the influence of the main component materials of high strength CA mortar on the mechanical properties,the influence of changes of the mass ratio of asphalt emulsion to cement(mA/mC) and the mass ratio of sand to cement(mS/mC) on the strength and elasticity modulus was studied.In order to analyze the microcosmic mechanism of mechanical properties of CA mortar,the cement asphalt gel microstructure and interface between CA mastic and sand in CA mortar were observed by the scan electron microscopy.Results show as follows: The axial compressive strength and elasticity modulus of CA mortar decline dramatically with the increase of mA/mC;along with increasing of mS/mC,the elasticity modulus of CA mortar changes little,while the 28 d axial compressive strength changes little at first and then declines sharply;the cement asphalt gel microstructure characters and interface bonding between CA mastic and sand in CA mortar determine the mechanical characteristics of CA mortar.The appropriate mA/mC and good flow properties are the guarantee of good mechanical properties of CA mortar.