Yesitis - N. D. Bhatt; Engineering Drawing, 50th Edition (2010), Charotar Book Stall PDF

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N. D. Bhatt; Engineering Drawing, 50th Edition (2010), Charotar Book Stall...

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Determination of in-field temperature variations i fresh HMA and corresponding compactio temperatures

Article info Article history: Received 4 October 2018 Received in revised form 6 April 2019 Accepted 20April2019

Keywords: HMA compaction Environmental factors Temperature differential Cessation temperature Traffic opening

Abstract Hot mix asphalt (HMA) compacted at low temperatures develops many distres due to high air voids. Asphalt compaction operations in the field are mostly bas on the experience of field staff. Hence, independent of the actual temperature the HMA. In this study, temperature variation in hot mix asphalt (HMA) w investigated during paving operations at eight test locations in field. Two m commonly used HMA layer thicknesses i.e. 5 cm and 8 cm were studi Temperature of the fresh HMA layer was noted at the centre, surface and at interface points by four node K-type thermocouple assembly. The average lay temperature of the HMA for eight tests was calculated as 136.92_C. Whereas, average compaction start temperature for eight tests was noted as 127.81 which shows the critical temperature loss of 9.11 _C before the compaction sta The average compaction end temperature calculated was 62.89 _C which is be the common cut off temperature of 80_C. Temperature difference between day a night tests was 10 _C which can be attributed as the effect of sunlight. The resu of this study can be helpful to the field staff in decision making during pavi operations.

Introduction Asphalt is an expensive composite material used extensively for the construction of pavements...