Evaluation of ultraviolet aging resistance of bitumen containing different organic layered double hydroxides
Evaluation of ultraviolet aging resistance of bitumen containing different organic layered double hydroxides
复制标题
不同有机层状双氢氧化物沥青的抗紫外老化性能评价
DOI：
10.1016/j.conbuildmat.2018.10.172
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发表时间：
2018-12-20
影响因子：
7.4
通讯作者：
Que, Yun
中科院分区：
文献类型：
--
作者：
Xu, Song;Dang, Lin;Que, Yun
层状双氢氧化物(LDHs)由于具有较高的紫外光反射率而被用于改善沥青的抗紫外线老化性能，但LDHs颗粒与沥青的相容性差，不能均匀稳定地分散在沥青中。因此，在应用之前必须解决兼容性差的问题。通常情况下，有机改性可以改变无机粒子的表面特性，从而改善其相容性。本工作的目的是评价所制备的各种有机水滑石对沥青抗紫外线老化性能的影响，从而确定一种用于沥青改性的最佳有机水滑石。为此，采用三种有机阴离子十二烷基苯磺酸钠(SDBS)、十二烷基硫酸钠(SDS)和十二烷基磺酸钠(SDSO)作为有机改性剂制备了有机LDHs(OCLDHs)，并研究了OCLDHs改性沥青的储存稳定性和抗紫外线老化性能。试验结果表明，有机改性可以抑制OCLDHs改性沥青在高温储存过程中的析出现象，改善了混合料的相容性和稳定性。与LDHs改性沥青相比，OCLDHs改性沥青在紫外线照射下的老化程度较低，表明OCLDHs对提高沥青的抗紫外线老化性能具有更好的效果。FTIR分析表明，OCLDHs有效地抑制了沥青中含氧官能团的形成和芳香族结构的形成。此外，与十二烷基硫酸钠和十二烷基硫酸钠相比，SDBS在与沥青的相容性和沥青的抗紫外线老化性能方面是一种较好的有机改性剂。(C)2018爱思唯尔有限公司。保留所有权利。
Layered double hydroxides (LDHs) have been alternatively employed to improve the ultraviolet (UV) aging resistance of bitumen due to their high UV reflectance, but LDHs particles cannot be dispersed into bitumen uniformly and stably since their poor compatibility with bitumen. Therefore, the problem of poor compatibility must be solved before its application. Generally, organic modification can change the surface characteristics of inorganic particle and then improve the compatibility. The objectives of this work are to evaluate the effect of prepared various organic LDHs on the anti-UV aging property of bitumen and then determine an optimal organic LDHs for bitumen modification. For these purposes, three organic anions, sodium dodecyl benzenesulfonate (SDBS), sodium dodecyl sulfate (SDS) and sodium dodecyl sulfonate (SDSO), were used as organic modifiers to prepare organic LDHs (OCLDHs), then the storage stability and anti-UV aging of OCLDHs modified bitumen were investigated. Experimental results show the organic modification can suppress the separation phenomenon of OCLDHs modified bitumen during the high temperature storage, indicating the compatibility and stability of the mixture is ameliorated. Compared with LDHs modified bitumen, OCLDHs modified bitumens show lower aging degree during UV exposure, which indicates that OCLDHs exhibit better effect in enhancing the anti-UV aging performance of bitumen. FTIR analysis indicates that OCLDHs effectively retard the formations of oxygen-containing functional groups and aromatic structure of bitumen. Furthermore, SDBS is a preferable modifier for the preparation of organic LDHs due to the most effective improvement in compatibility with bitumen and UV aging resistance of bitumen as compared with SDS and SDSO. (C) 2018 Elsevier Ltd. All rights reserved.