Investigation of the effect of Mg-Al-LDH on pavement performance and aging resistance of styrene-butadiene-styrene modified asphalt
Investigation of the effect of Mg-Al-LDH on pavement performance and aging resistance of styrene-butadiene-styrene modified asphalt
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DOI：
10.1016/j.conbuildmat.2018.03.280
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发表时间：
2018-05-30
影响因子：
7.4
通讯作者：
Zhang, Aoming
中科院分区：
文献类型：
--
作者：
Li, Yuanyuan;Wu, Shaopeng;Zhang, Aoming
层状双氢氧化物（LDH）可以提高沥青结合料的抗老化性能。然而，以往的研究都是任意选择LDH的单一掺量，如3%或5%，这不足以准确了解LDH及其掺量对沥青混合料路用性能和抗老化性能的影响，因此，从更广泛的掺量范围内研究LDH对沥青性能的影响具有重要意义。同时，LDH与沥青结合料的相互作用尚不清楚。本文采用Mg-Al-CO_3_2-LDH对苯乙烯-丁二烯-苯乙烯改性沥青（SBS MA）进行了6种不同掺量（2%~ 7%）的改性。红外光谱（FTIR）和X射线衍射（XRD）分析结果表明，LDH与SBS MA之间没有发生化学反应，LDH与SBS MA的共混是物理共混。采用动态剪切流变仪（DSR）和弯曲梁流变仪（BBR）对SBS MA的流变性能进行了研究，结果表明，LDH可以改善SBS MA的高温性能，控制LDH用量低于4%时，对SBS MA的其它性能没有明显影响。FTIR、复模量和VAI测试结果表明，LDH能显著提高SBS MA的耐热氧老化和耐紫外老化性能。综合考虑LDH对沥青混合料抗老化性能和路用性能的影响，建议LDH的最佳掺量为4%。(C)2018爱思唯尔有限公司版权所有。
Layered double hydroxide (LDH) could improve the aging resistance of an asphalt binder. However, the previous work all arbitrarily selected only one dosage of LDH such as 3% or 5%, which could not be enough to know the effect of LDH and its dosage on the pavement performance and aging resistance of an asphalt binder accurately, it is important to investigate the LDH effect on the properties of asphalt from more widely ranges of dosages. Meanwhile, the LDH and asphalt binder interaction is still unclear. In this paper, six dosages (from 2% to 7%) of Mg-Al-CO32--LDH were conducted to modify the styrene-butadienestyrene modified asphalt (SBS MA). The Fourier transform infrared spectroscopy (FTIR) and X ray diffraction (XRD) results indicate that there is no chemical reaction between LDH and SBS MA, the blending of LDH and SBS MA is a physical way. The rheological properties of SBS MA are studied by both dynamic shear rheometer (DSR) and bending beams rheometer (BBR), the results show that LDH can improve the high temperature performance of SBS MA, and does not significantly weaken other properties of SBS MA by controlling LDH dosage to be lower than 4%. The FTIR, complex modulus and VAI results show that LDH can significantly improve both the thermal oxide aging and UV aging resistances of SBS MA. LDH dosage of 4% is suggested to be the optimal dosage after considering the effect of LDH on the aging resistance and pavement performance of asphalt binder. (C) 2018 Elsevier Ltd. All rights reserved.