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Analysis of air void variations with traffic in hot mix asphalt wearing course mixtures used in Sri Lankan roads - a case study

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dc.contributor.advisor Mampearachchi, WK
dc.contributor.author Lakmal, KHR
dc.date.accessioned 2017-01-04T09:06:05Z
dc.date.available 2017-01-04T09:06:05Z
dc.identifier.uri http://dl.lib.mrt.ac.lk/handle/123/12186
dc.description.abstract Over the past decades, road construction with hot mix asphalt (HMA) has significantly increased. However, many issues have risen with respect to the durability of recently constructed asphalt concrete roads. Therefore, the importance of introducing new quality control measures is a current concern. Properties of the asphalt mixture and the construction practices are important criteria for quality and durability of asphalt pavements. Present Sri Lankan practice is to measure and control, (1) Thickness, (2) Density, (3) Bitumen content and aggregate gradation, and (4) Roughness index (IRI) of the laid asphalt mat. Objective of the present research is to find the importance of measuring air void of the laid asphalt mat and the need of a combined index of significant parameters to improve quality and durability of asphalt concrete roads. Core samples were tested at 12 locations with various initial compaction levels at two aging levels, as 100 days and 225 days. In addition, performance of road sections was evaluated with various levels of initial compaction after 5 years to check the long-term aging of asphalt concrete. It revealed that initial air void content decreased significantly under traffic in a short period and it is not possible to evaluate the long-term performance of HMA roads by initial air void content alone. en_US
dc.language.iso en en_US
dc.subject Air voids, Marshall density, Degree of compaction en_US
dc.title Analysis of air void variations with traffic in hot mix asphalt wearing course mixtures used in Sri Lankan roads - a case study en_US
dc.type Thesis-Abstract en_US
dc.identifier.faculty Engineering en_US
dc.identifier.degree M.Eng. en_US
dc.identifier.department Department of Civil Engineering en_US
dc.date.accept 2015
dc.identifier.accno 109883 en_US


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