Abstract: The addition of an appropriate amount of naphthalene superplasticizer (NSP) to modified asphalt emulsified (MAE) enables direct mixing of cement and modified emulsified asphalt. When the NSP content is 4%, cement asphalt mastic (CAM) does not work well. The asphalt and three organic retarders used in this test are: modified emulsified asphalt, seaweed powder, polyacrylamide (PAM), sodium gluconate. The test results show that seaweed powder has the best effect on CAM. When the dosage of seaweed powder is 0.03%, the 28 d tensile strength and compressive strength of CAM are the highest, the setting time is the shortest, the variation of dry shrinkage is small, and the intensity increment within 7 d is relatively large; with the amount of seaweed powder increased, tensile strength and compressive strength decreased. PAM has a great influence on the viscoelasticity of CAM because of its strong viscosity and flocculation. When the PAM content is 0.02%, the viscosity of CAM is the largest and the turbulence is the smallest. In the process of increasing 0.01% to 0.03%, the viscosity, dry shrinkage and compressive strength of CAM showed a first increase and then decrease, and the turbulence and condensation time showed a first change and then an increase. The tensile strength increases as the amount of the addition increases. Sodium gluconate has the worst improvement effect on CAM. Although the addition of sodium gluconate can improve the non-mechanical properties such as fluidity and viscosity of CAM, it will cause large vo-lume shrinkage and shrinkage, tensile strength and resistance of CAM test pieces. The pressure strength is obviously lowered, the setting time is too long, and cracks appear on the surface of the test piece.
杜华川, 王延宁, 何苗苗, 林梓锋, 吕正宗. 有机缓凝剂对水泥改性乳化沥青胶浆的改善效果研究[J]. 材料导报, 2019, 33(Z2): 254-260.
DU Huachuan, WANG Yanning, HE Miaomiao, LIN Zifeng, LYU Zhengzong. Study on the Effect of Organic Retarder on the Performance of Cement ModifiedEmulsified Asphalt Mastic. Materials Reports, 2019, 33(Z2): 254-260.
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