Multi-scale evaluation of sodium dodecyl sulfate intercalated LDHs on the ageing resistance of SBS modified bitumen
Multi-scale evaluation of sodium dodecyl sulfate intercalated LDHs on the ageing resistance of SBS modified bitumen
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DOI：
10.1016/j.conbuildmat.2023.133369
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发表时间：
2023-11
影响因子：
7.4
通讯作者：
Canlin Zhang;Yifei Li;Ting Wang;Song Xu;Hongyan Ma;Lei Fang;Yun Que;Yu Chen
中科院分区：
文献类型：
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作者：
Canlin Zhang;Yifei Li;Ting Wang;Song Xu;Hongyan Ma;Lei Fang;Yun Que;Yu Chen
采用十二烷基硫酸钠（SDS）插层水滑石（LDHs）的方法提高SBS改性沥青（SMB）的抗老化性能。X射线衍射（XRD）和傅里叶变换红外光谱（FTIR）分析表明，SDS已插层到水滑石层间。与LDHs相比，SDS插层LDHs（OLDHs）与SMB的相互作用明显增强，在SMB中的分散性和稳定性更好。老化后，SMB的粘弹性能变差。LDHs和OLDHs能明显缓解老化对SMB性能的恶化，提高SMB的耐老化性能，尤其是OLDHs。此外，通过分子动力学研究了OLDHs和LDHs对SMB抗老化性能的微观增强机理。LDHs的掺入可以阻断氧向SMB内部的侵入，抑制氧在SMB中的扩散速率，从而降低SMB老化过程中发生氧化反应的几率，最终达到改善SMB耐老化性能的目的。SDS插层改性后，LDH的改性效果进一步提高，即SDS插层改性有利于提高LDH的抗SMB老化性能。
Sodium dodecyl sulfate (SDS) intercalated layered double hydroxides (LDHs) were prepared to enhance the ageing resistance of SBS modified bitumen (SMB). X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR) showed that SDS has been intercalated into the interlayers of LDHs. Compared to LDHs, the interaction between SDS intercalated LDHs (OLDHs) and SMB was obviously stronger, and OLDHs exhibited better dispersity and stability in SMB. After ageing, the viscoelastic properties of SMB were deteriorated. LDHs and OLDHs could obviously alleviate the deterioration of ageing on the properties of SMB, which could improve the ageing resistance of SMB, especially OLDHs. Additionally, the enhancement mechanisms of OLDHs and LDHs for the ageing resistance of SMB at the microscopic scale were investigated by molecular dynamics. The incorporation of LDHs could obstruct the invasion of oxygen into the interior of SMB and inhibit the diffusion rate of oxygen in SMB, which reduced the oxidation reaction probability of SMB during ageing, and eventually achieved the improvement on ageing resistance of SMB. The effectiveness of LDHs was further improved after SDS intercalated modification, that was, SDS intercalated modification was beneficial to enhance the ageing resistance of LDHs for SMB.