Materials Reports  2019, Vol. 33 Issue (Z2): 254-260 |
| INORGANIC MATERIALS AND CERAMIC MATRIX COMPOSITES |
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| Study on the Effect of Organic Retarder on the Performance of Cement ModifiedEmulsified Asphalt Mastic |
| DU Huachuan, WANG Yanning, HE Miaomiao, LIN Zifeng, LYU Zhengzong
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| Department of Civil and Environmental Engineering, Shantou University, Shantou 515000 |
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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.
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Published: 25 November 2019
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About author:: Huachuan Du, the graduate student of Shantou University. From September 2013 to June 2017, he obtained a bachelor’s degree in engineering cost from Sichuan Agricultural University and a master’s degree from Shantou University after graduation. Apply for two national invention patents, of which one has been authorized. The research work mainly focuses on paving materials represented by cement asphalt concrete, and also carries out research on new fields of microbial reinforcement of soft soil foundation, and participated in two National Natural Science Fund Youth Projects.
Zhengzong Lyu, associate professor of Shantou University. He has published more than 20 papers in core journals at home and abroad, including 3 papers in SCI journals and 1 paper in EI journals. A total of 4 invention patents have been authorized. The main research direction is new paving materials, and participated in the research of technical solutions of more than ten major projects. |
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