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Moisture Damage and Its Relation to Surface Adsorption/Desorption of Rejuvenators
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2020-07-07 , DOI: 10.1021/acs.iecr.0c02534 Elham H. Fini 1 , Alireza Samieadel 1 , Amirul Rajib 1
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2020-07-07 , DOI: 10.1021/acs.iecr.0c02534 Elham H. Fini 1 , Alireza Samieadel 1 , Amirul Rajib 1
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This paper uses a multiscale approach to study the preferential surface adsorption of bio-based rejuvenators to siliceous substrates, used here as surrogates for mineral stones like quartz in bituminous composites. Bituminous composites are the main building blocks of asphalt pavements and roofing shingles. Various rejuvenators, including bio-based rejuvenators, are commonly used to extend the service life or facilitate the recycling of aged bituminous composites reclaimed at the end of their service life. While rejuvenators may be able to restore the thermomechanical properties of aged asphalt, the rejuvenators’ susceptibility to moisture damage is a rising concern as various types and dosages of biorejuvenators gain traction in the market. Here, we hypothesize that by controlling the composition of rejuvenators, the adsorption of rejuvenators to siliceous minerals in a wet environment can be increased, leading to enhanced resistance to moisture damage in revitalized aged asphalt. To test this hypothesis, we specifically designed a rejuvenator from a balanced feedstock of algae (high in protein and nucleic acids) and manure (high in lipid), and we compare its resistance to moisture damage with that of two commercial rejuvenators, using molecular modeling and laboratory experiments. Molecular modeling was geared toward simulation, and laboratory experiments were performed using the moisture-induced shear-thinning index (MISTI) and the wheel-tracking test under water. The study results showed that even though the aged asphalt was not susceptible to moisture damage, its moisture susceptibility varied significantly after it was revitalized by each of the three rejuvenators tested. Our molecular simulations showed that water promoted the desorption of molecules of low-performing rejuvenators from the siliceous stone surface, giving rise to moisture damage. This finding was supported by laboratory experiments showing a water-stripping inflection point (SIP) and a significant change in the shear-thinning slope after water exposure. The hybrid rejuvenator did not show any evidence of desorption or a stripping inflection point; this can be attributed to the presence of amide-enriched compounds in the hybrid rejuvenator that resulted from feedstock with a balanced combination of protein, nucleic acids, and lipids. The results of this study highlight the importance of accounting for a rejuvenator’s composition to ensure that the rejuvenator’s introduction to aged bitumen does not negatively impact the durability of the bituminous composite. This is even more critical for severely aged asphalts, which may require a higher concentration of rejuvenators to restore their properties. The study outcome provides insights to formulators and manufacturers to account for durability in their attempts at recycling and resource conservation to enhance sustainability in construction.
中文翻译：
保湿剂的水分损伤及其与表面吸附/解吸的关系
本文采用多尺度方法研究了生物基再生剂对硅质基质的优先表面吸附，此处用作硅酸盐复合材料中石英等矿物石的替代物。沥青复合材料是沥青路面和屋顶瓦的主要结构单元。各种再生剂，包括生物基再生剂，通常用于延长使用寿命或促进在使用寿命结束时回收的老化沥青复合材料的回收利用。尽管再生剂可能能够恢复老化沥青的热机械性能，但随着各种类型和剂量的生物再生剂在市场上的吸引力，再生剂对水分破坏的敏感性日益受到关注。在这里，我们假设通过控制再生剂的成分，在湿润的环境中，再生剂对硅质矿物的吸附可以增加，从而增强了活化的老化沥青对水分破坏的抵抗力。为了验证这一假设，我们从平衡的藻类（蛋白质和核酸含量高）和粪肥（脂质含量高）的原料中专门设计了一种嫩肤剂，并使用分子模型将其与两种商业嫩肤剂的抗水分破坏能力进行了比较。和实验室实验。分子建模旨在进行模拟，并使用水分诱导的剪切稀化指数（MISTI）和水下车轮跟踪测试进行了实验室实验。研究结果表明，即使老化的沥青不易受潮，它的水分敏感性在测试的三个再生剂中的每一个恢复活力后都发生了显着变化。我们的分子模拟表明，水促进了性能低劣的嫩肤剂分子从硅质石材表面解吸，从而导致水分受损。这一发现得到了实验室实验的支持，该实验显示出了水剥离拐点（SIP），并且在暴露于水后，剪切稀化斜率发生了显着变化。混合回春剂未显示出任何解吸或拐点拐点的迹象；这可以归因于杂化再生剂中酰胺含量高的化合物的存在，这是由于原料具有蛋白质，核酸和脂质的平衡组合所致。这项研究的结果凸显了考虑再生剂组成的重要性，以确保再生剂引入老化的沥青不会对沥青复合材料的耐久性产生负面影响。对于严重老化的沥青而言，这甚至更为关键，因为沥青可能需要更高浓度的再生剂才能恢复其性能。研究结果为配方设计师和制造商提供了见解，以说明其在尝试回收利用和节约资源以增强建筑可持续性方面的耐久性。
更新日期：2020-07-29
中文翻译：
保湿剂的水分损伤及其与表面吸附/解吸的关系
本文采用多尺度方法研究了生物基再生剂对硅质基质的优先表面吸附，此处用作硅酸盐复合材料中石英等矿物石的替代物。沥青复合材料是沥青路面和屋顶瓦的主要结构单元。各种再生剂，包括生物基再生剂，通常用于延长使用寿命或促进在使用寿命结束时回收的老化沥青复合材料的回收利用。尽管再生剂可能能够恢复老化沥青的热机械性能，但随着各种类型和剂量的生物再生剂在市场上的吸引力，再生剂对水分破坏的敏感性日益受到关注。在这里，我们假设通过控制再生剂的成分，在湿润的环境中，再生剂对硅质矿物的吸附可以增加，从而增强了活化的老化沥青对水分破坏的抵抗力。为了验证这一假设，我们从平衡的藻类（蛋白质和核酸含量高）和粪肥（脂质含量高）的原料中专门设计了一种嫩肤剂，并使用分子模型将其与两种商业嫩肤剂的抗水分破坏能力进行了比较。和实验室实验。分子建模旨在进行模拟，并使用水分诱导的剪切稀化指数（MISTI）和水下车轮跟踪测试进行了实验室实验。研究结果表明，即使老化的沥青不易受潮，它的水分敏感性在测试的三个再生剂中的每一个恢复活力后都发生了显着变化。我们的分子模拟表明，水促进了性能低劣的嫩肤剂分子从硅质石材表面解吸，从而导致水分受损。这一发现得到了实验室实验的支持，该实验显示出了水剥离拐点（SIP），并且在暴露于水后，剪切稀化斜率发生了显着变化。混合回春剂未显示出任何解吸或拐点拐点的迹象；这可以归因于杂化再生剂中酰胺含量高的化合物的存在，这是由于原料具有蛋白质，核酸和脂质的平衡组合所致。这项研究的结果凸显了考虑再生剂组成的重要性，以确保再生剂引入老化的沥青不会对沥青复合材料的耐久性产生负面影响。对于严重老化的沥青而言，这甚至更为关键，因为沥青可能需要更高浓度的再生剂才能恢复其性能。研究结果为配方设计师和制造商提供了见解，以说明其在尝试回收利用和节约资源以增强建筑可持续性方面的耐久性。
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