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Development of a composite substrate peel test to assess moisture sensitivity of aggregate–bitumen bonds

机译:研发复合基材剥离试验,以评估骨料-沥青粘结层的湿度敏感性

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摘要

This paper presents the development of a suitable procedure to prepare peel test specimens using coarse aggregates and compare the results with the established standard peel test. The newly developed composite substrate peel test (CSPT) was found to be effective in characterising the moisture sensitivity of the aggregate–bitumen bond and the results correlated well with the results from a standard peel test. The results from the CSPT and the standard peel test showed that the fracture energy after moisture damage was found to be aggregate type dependent. Limestone tends to have better resistance to moisture damage than granite when moisture adsorptions are similar. Furthermore, in terms of similar aggregates, lower moisture adsorption results in better moisture resistance. This phenomenon suggests that in a moisture susceptible asphalt mixture, the effect of aggregate may be more influential than the effect of bitumen. Strong correlations were found between the standard peel test and the CSPT in terms of moisture damage evaluation and suggest that the CSPT maybe a more practical procedure to test the aggregate–bitumen bond for actual aggregates used in asphalt mixtures.
机译:本文介绍了使用粗骨料制备剥离试样的合适程序的发展,并将结果与​​已建立的标准剥离试验进行了比较。发现新开发的复合基材剥离试验(CSPT)可有效表征骨料-沥青键的湿度敏感性,其结果与标准剥离试验的结果具有很好的相关性。 CSPT和标准剥离试验的结果表明,水分破坏后的断裂能与骨料类型有关。当水分吸收相似时,石灰石往往比花岗岩具有更好的抗水分破坏能力。此外,就相似的骨料而言,较低的水分吸收导致更好的抗湿性。这种现象表明,在易受潮的沥青混合料中,集料的影响可能比沥青的影响更大。在标准剥离试验和CSPT之间,在湿气损害评估方面发现了很强的相关性,这表明CSPT可能是测试沥青混合料中实际骨料的骨料-沥青键的更实用程序。

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