Improvements on high-temperature stability, rheology, and stiffness of asphalt binder modified with waste crayfish shell powder
Improvements on high-temperature stability, rheology, and stiffness of asphalt binder modified with waste crayfish shell powder
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DOI：
10.1016/j.jclepro.2020.121745
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发表时间：
2020-08-10
影响因子：
11.1
通讯作者：
Zheng, Jianlong
中科院分区：
文献类型：
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作者：
Lv, Songtao;Xia, Chengdong;Zheng, Jianlong
中国小龙虾壳废料的快速积累导致了严重的环境问题和回收压力。本研究旨在建立一个有效的方案，利用废弃龙虾壳粉生产高性能和可持续的沥青结合料。首先在140 ℃ ~ 150 ℃温度范围内制备了不同龙虾壳粉含量（质量分数分别为对照沥青的5%、10%和20%）的改性沥青结合料。通过软化点和针入度的测定，比较了改性前后沥青结合料的刚度差异。结果表明，贝壳粉的加入提高了对照沥青的软化点，降低了针入度。此外，通过动态剪切流变仪（DSR）试验考察了沥青结合料的高温稳定性。DSR试验结果表明，贝壳粉的加入降低了沥青混合料的相位角δ，提高了沥青混合料的动态剪切模量（vertical bar G*vertical bar），最终提高了沥青混合料的车辙系数（vertical bar G*vertical bar/sin δ）。在此基础上，采用多应力蠕变恢复（MSCR）试验对改性沥青结合料和对照沥青结合料的蠕变性能进行了比较。MSCR试验结果表明，在相同温度下，改性沥青的回复率高于对照沥青，而不可回复蠕变柔量J（nr）低于对照沥青。结果表明，龙虾壳粉的加入能提高沥青结合料的劲度、高温稳定性和抗蠕变性。最后，通过傅立叶变换红外光谱（FT-IR）测试表明，CS的加入不会影响沥青结合料的化学结构，改性主要是物理过程。在讨论部分，本文也详细说明了本研究的新奇和局限性。试验结果可为螯虾壳粉改性沥青材料的工程应用提供参考，使产品更清洁、更环保。(C)2020爱思唯尔有限公司版权所有。
The quickly accumulated crayfish shell waste in China has led to severe environmental issues and recycling pressure. This study aims to build an efficient protocol by utilizing waste crayfish shell powder in the production of high-performance and sustainable asphalt binder. The asphalt binder modified with different contents of crayfish shell powder (5%, 10% and 20% mass ratio to control asphalt, respectively) were first prepared at the temperature of 140 degrees C-150 degrees C. Then the softening point and the penetration of the prepared samples were implemented to compare the stiffness difference between the modified and original asphalt binder. The results indicated that the added shell powder increased the softening point and decreased the penetration of the control asphalt. Furthermore, the high-temperature stability of the asphalt binder was examined by the dynamic shear rheometer (DSR) tests. The DSR results revealed that adding shell powder could enhance the rutting resistance of the asphalt binder by decreasing the phase angle delta, increasing the dynamic shear modulus vertical bar G*vertical bar and finally enhancing the rutting factor vertical bar G*vertical bar/sin delta. After that, to compare the creep performance between the control and modified asphalt binder, the multiple stress creep recovery (MSCR) tests were employed. The results of the MSCR test showed that at the same temperature, the percent recovery was higher while the non-recoverable creep compliance J(nr) of modified asphalt was lower than those of the control binder. These results indicated that the added crayfish shell powder could increase the stiffness, improve the high-temperature stability and creep resistance of the asphalt binder. Finally, fourier transform infrared spectroscopy (FT-IR) test results implied that the added CS would not affect the chemical structure of the asphalt binder, and the modification was mainly a physical process. The novelty and limitation of this study have also been detailedly explained in the discussion part. The test results could provide a reference for the engineering application of the crayfish shell powder modified asphalt material and lead to both a cleaner and greener product. (C) 2020 Elsevier Ltd. All rights reserved.