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首页> 外文期刊>Construction and Building Materials >Application of surface-modified silica nanoparticles with dual silane coupling agents in bitumen for performance enhancement
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Application of surface-modified silica nanoparticles with dual silane coupling agents in bitumen for performance enhancement

机译：具有双硅烷偶联剂的表面改性二氧化硅纳米粒子在沥青中的应用，以提高性能

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Bitumen is a black and highly viscous liquid that holds stone aggregate together in road pavement. Oxidation aging of bitumen can accelerate overall pavement deterioration and shorten pavement service life. Use of silica nanoparticles (SNPs) have been promoted as a sustainable construction practice to delay bitumen oxidation. Nonetheless, adequate dispersion of SNPs in bitumen has been a challenge since their first employment. Surface functionalization of SNPs with (3-aminopropyl) triethoxysilane (APTES) has demonstrated its efficiency to improve dispersion of SNPs in bitumen at relatively high loading of SNPs with low mechanical energy input. As the amount of APTES increases in the process of surface modification of SNPs, however, average size of the resultant SNPs and their agglomeration in bitumen also increase due to APTES self-condensation reaction on SNP surface. This research investigated surface modification of SNPs with other silane coupling agents including 3-(trihydroxysilyl) propyl methylphosphonate (THPMP) and (3-glycidyloxypropyl) trimethoxysilane (GPTMS) as well as dual silane combinations: APTES with THPMP and APTES with GPTMS. The intention was to minimize agglomeration of SNPs in bitumen and to further improve overall performance of SNP-containing bitumen. The comparative experimental results indicated that the surface-modified SNPs with dual silanes (APTES-GPTMS) outperformed the sole APTES-modified SNPs regarding dispersion in bitumen, resulting in bitumen with more enhanced anti-aging and low temperature properties. The results of this study inform and promote the application of SNPs in road pavement with enhanced performance and sustainability. (C) 2020 Elsevier Ltd. All rights reserved.
机译：沥青是一种黑色的高粘度液体，可将石料在路面中粘结在一起。沥青的氧化老化会加速整体路面的劣化并缩短路面的使用寿命。二氧化硅纳米颗粒（SNPs）的使用已被推广为可持续的建筑实践，以延迟沥青的氧化。然而，自从第一次使用以来，SNP在沥青中的充分分散一直是一个挑战。用（3-氨基丙基）三乙氧基硅烷（APTES）对SNP进行表面功能化已显示出其在相对较高的SNP负荷下以较低的机械能输入改善了SNP在沥青中的分散性的效率。然而，随着APTES的量在SNP的表面修饰过程中增加，由于APTES在SNP表面上的自缩合反应，所得SNP的平均尺寸及其在沥青中的附聚也增加。这项研究研究了使用其他硅烷偶联剂对SNP的表面改性，包括3-（三羟基甲硅烷基）丙基甲基膦酸酯（THPMP）和（3-环氧丙氧基丙基）三甲氧基硅烷（GPTMS）以及双硅烷组合：APTES与THPMP以及APTES与GPTMS。目的是使沥青中SNP的聚集最小化，并进一步改善含SNP沥青的整体性能。对比实验结果表明，在沥青中的分散性方面，含双硅烷的表面改性SNP（APTES-GPTMS）优于单独的APTES改性SNP，从而使沥青具有更强的抗老化性和低温性能。这项研究的结果为提高性能和可持续性提供了信息，并促进了SNP在路面中的应用。 （C）2020 Elsevier Ltd.保留所有权利。

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