Effect of super absorbent polymer(SAP) on viscosity and mechanical properties of asphalt

被引：0
|
作者：
Wu H. [1 ]
Sun Y. [1 ]
Song W. [1 ]
Zhan Y. [1 ]
机构：
[1] School of Civil Engineering, Central South University, Changsha
来源：
Zhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (Science and Technology) | 2022年 / 53卷 / 10期
基金：
中国国家自然科学基金;
关键词：
low temperature performance; rheological property; super absorbent polymer (SAP); viscosity reduction effect;
D O I：
10.11817/j.issn.1672-7207.2022.10.015
中图分类号：
学科分类号：
摘要：
Super absorbent polymer (SAP) has strong water absorption and retention capacities, and water-absorbing SAP has the function of foaming and reducing viscosity of asphalt. In order to explore the viscosity reduction effect of SAP after water absorption on asphalt mastic, SAP was used with different dosages to replace hydrated lime in equal volume. Firstly, infrared spectrum test was conducted to analyze the interaction mechanism between SAP and asphalt. Then, viscosity test was performed to explore volume fraction of the asphalt mastic viscosity when SAP substituted different amounts of hydrated lime (10%, 20%, 30%, 40%, volume function) and pre-absorbed different amounts of water. On this basis, dynamic shear creep test and low temperature bending test were carried out to verify the high and low temperature behaviors of SAP-modified asphalt. Finally, the adhesion test was conducted to explore the effect of SAP on the adhesion between asphalt mastic and aggregate. The results show that SAP and asphalt exist in a physical blending state. The replacement of hydrated lime with water-absorbing SAP has good effect on viscosity reduction, but the viscosity reduction is no longer obvious when the replacement amount is larger than 30% and the water absorption is more than three times of the mass of SAP. The high temperature stability performance of asphalt mortar is improved when the equal volume of SAP is not more than 10% of the hydrated lime, and the low temperature cracking performance is reduced. However, the high temperature stability performance decreases after 10% SAP inclusion, and the decrease rate is less than 15%. The low temperature cracking performance is promoted. The inclusion of SAP has no effect on the adhesion between asphalt mastic and aggregate. © 2022 Central South University of Technology. All rights reserved.
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页码：3948 / 3958
页数：10
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