INORGANIC MATERIALS AND CERAMIC MATRIX COMPOSITES |
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Influence of Different Warm Mix Agents on Rheological and Microscopic Properties of High-viscosity Asphalt |
WANG Yanlei1, LU Jun2, LIANG Pengfei1, LUO Ting3,4, YAN Chuanqi3,4,*
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1 Shandong Road and Bridge Group Co., Ltd., Jinan 250000, China 2 China Southwest Design and Research Institute of Municipal Engineering, Chengdu 610081, China 3 School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, China 4 Highway Engineering Key Laboratory of Sichuan Province, Chengdu 610031, China |
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Abstract High-viscosity asphalt has been widely used in China. It is quite common to use warm mix agents to improve the workability for high-viscosity asphalt. However, not many researches have been conducted to investigate the influence of warm mix agents on the rheological and micro properties of high-viscosity asphalt. In this paper, the Brookfield test is first conducted to determine the optimum dosage of different warm mix agents (ACMP, Sasobit, WCO, Evotherm) for high-viscosity asphalt. The microscopic property changes brought by the warm mix agents are investigated using FTIR. Then the temperature sweep test, creep test and linear amplitude sweep test (LAS) were used to study the influence on the rheological properties of high viscosity asphalt. The research results show that Sasobit is a waxy warm mix agent, which shows crystalline state when the temperature is lower than the melting point. This improves the high-temperature performance and creep recovery performance of high-viscosity asphalt but decreases the low-temperature performance and fatigue resistance. Evotherm is a quaternary ammonium salt surfactant. It changes the surface tension between asphaltene molecules, which has adverse effects on the high-temperature performance and fatigue resistance of high-viscosity asphalt. ACMP and WCO are basically lubricants, and their addition improves the fatigue resistance of high-viscosity asphalt. Based on the evaluation on the physical properties, rheological properties, and microscopic properties, ACMP might be recommended.
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Published: 25 August 2023
Online: 2023-08-14
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Fund:National Natural Science Foundation of China (52008353, 51908426), China Postdoctoral Science Foundation (BX20190240, 2019M660097), Sichuan Youth Science and Technology Innovation Research Team (2021JDTD0023, 2022JDTD0015), and Chengdu Technological Innovation R & D Project (2021-YF05-01175-SN). |
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