Effect of layered double hydroxides on the VOCs emission and the properties of SBS modified asphalt
Construction and Building Materials, ISSN: 0950-0618, Vol: 439, Page: 137398
2024
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Findings from Chang'an University Has Provided New Data on Building and Construction (Effect of Layered Double Hydroxides On the Vocs Emission and the Properties of Sbs Modified Asphalt)
2024 AUG 20 (NewsRx) -- By a News Reporter-Staff News Editor at Daily Real Estate News -- Current study results on Building and Construction have
Article Description
During the production process of hot-mix asphalt mixtures, high-temperature heating of asphalt is required, which leads to the emission of a large amount of volatile organic compounds (VOCs). Additionally, during their service life, asphalt pavements are slowly and continuously releasing VOCs under ultraviolet radiation. This emission poses significant risks to the health of construction workers and the ecological environment. In this study, two types of layered double hydroxides (LDHs), Mg-Al-LDH (M-LDH) and Ca-Al-LDH (C-LDH), were used to modify SBS asphalt. The VOCs suppression ability under different conditions of the modified asphalt was tested on a laboratory scale. The VOCs suppression mechanism was analyzed through nitrogen adsorption-desorption experiments, synchronous thermal analysis, and UV–visible spectrophotometry. Additionally, the influence of LDHs on the performance of SBS asphalt was studied through Fourier transform infrared spectroscopy, aging simulation tests and dynamic shear rheological tests. The results showed that the VOCs suppression effect of C-LDH was superior to that of M-LDH. With the increase of C-LDH content, its inhibitory effect on VOCs first increases and then decreases. The optimal effect is achieved with 5 % C-LDH, with a VOCs inhibition rate of 52.48 % in a heating condition and 90.31 % under ultraviolet radiation conditions. The resistance of SBS-modified asphalt against ultraviolet aging and heat-oxidation is greatly increased by the inclusion of C-LDH. Moreover, greater complex modulus and rutting factor measurements indicate a discernible increase in the hardness of the asphalt due to the addition of Ca-Al-LDH. These enhancements suggest that LDH can strengthen SBS asphalt's resilience to rutting. Meanwhile, controlling the dosage of C-LDH at 5 % or less does not significantly reduce the low-temperature cracking resistance of the asphalt. Based on the advantages of both VOC reduction and performance improvement, the research concludes that the best compromise for changing SBS asphalt is a 5 % Ca-Al-LDH concentration.
Bibliographic Details
http://www.sciencedirect.com/science/article/pii/S0950061824025406; http://dx.doi.org/10.1016/j.conbuildmat.2024.137398; http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=85198040246&origin=inward; https://linkinghub.elsevier.com/retrieve/pii/S0950061824025406; https://dx.doi.org/10.1016/j.conbuildmat.2024.137398
Elsevier BV
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