沥青老化深度随紫外老化时间增加的发展机制,Case Studies in Construction Materials

当前位置： X-MOL 学术 › Case Studies in Construction Materials › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

沥青老化深度随紫外老化时间增加的发展机制
Case Studies in Construction Materials ( IF 6.5 ) Pub Date : 2022-04-08 , DOI: 10.1016/j.cscm.2022.e01057
Yuanyuan Li ₁ , Jianlin Feng ₁ , Anqi Chen ₂ , Shaopeng Wu ₂ , Tao Bai ₁ , Quantao Liu ₂ , Hongbin Zhu ₁

Affiliation

沥青的紫外老化对路面使用寿命有着显着的影响，因此，紫外老化的研究近年来越来越受到人们的关注。众所周知，沥青路面的老化并不是立即发生在整个深度的，而是随着老化时间的增加，沥青的老化深度逐渐增加。该研究的局限性在于沥青老化深度的发展机制尚不清楚。制备了不同厚度的沥青防水卷材，并通过紫外-可见分光光度法研究了沥青防水卷材的紫外光透射和吸收性能，旨在确定紫外光在紫外老化后沥青中的穿透深度。结果表明，对于同一沥青膜，紫外光透过率随着光波长的增加而增加；而紫外光透过率随着沥青膜厚度的增加而显着降低。紫外光在沥青中的穿透深度随着紫外老化时间的增加而逐渐增加。分析了紫外光在沥青中的穿透深度与沥青老化深度的关系，建立了沥青三部分的紫外老化模型，揭示了紫外光老化过程中沥青紫外老化深度的发展机制。沥青老化深度的增加是由于紫外光在沥青中穿透深度的增加，以及老化产物从表层沥青向更深层次沥青的扩散作用。在紫外老化过程中，沥青实际上包括三部分，即表面直接老化部分（紫外光可到达）、较深层的扩散老化部分（通过扩散作用而老化）和内部未老化部分（紫外光和扩散作用可到达）。不影响）。

"点击查看英文标题和摘要"

Development mechanism of aging depth of bitumen with increasing UV aging time

The UV aging of bitumen has a significant influence on the pavement service life, therefore, the research on UV aging has attracted increasing attention recently. It is known that the aging of bituminous pavements does not occur instantly through the full depth, instead, the aging depth of the bitumen increases gradually with the increasing aging time. The limitation of the research is that the development mechanism of the aging depth of bitumen is not clearly known. Various thicknesses of bituminous membranes were prepared and the UV light transmission and absorption properties of bituminous membranes were investigated by UV–visible spectrophotometric, aiming to determine the penetration depth of UV light in bitumen after UV aging. It is concluded that, for the same bituminous membrane, the transmittance of UV light increases with the increase of the light wavelength; while the transmittance of UV light decreases significantly with the increase of bituminous membrane thickness. The penetration depth of UV light in bitumen increases gradually with increasing UV aging time. The relationship between UV light penetration depth in bitumen and aging depth of bitumen was analyzed, and UV aging models of three parts of bitumen were established to reveal the development mechanism of the UV aging depth of bitumen during UV aging. The increasing aging depth of bitumen is due to the increase of UV light penetration depth in bitumen, and the diffusion action of aging products from surface bitumen to deeper bitumen. During the UV aging, the bitumen actually comprises three parts, namely, the surface direct aging part (UV light can reach), the deeper diffusion aging part (aged by the diffusion action) and the internal unaged part (UV light and diffusion action can not affect).

更新日期：2022-04-08

点击分享查看原文

点击收藏

公开下载

阅读更多本刊最新论文