Evaluation of local aggregate with chemical additives for microsurfacing mix

Author(s): eiborlang Lyngdoh Ryntathiang (1), Alan Carter (2), Anjan kumar Siddagangiah
Paper category: Proceedings
Book title: Proceedings of the International Conference on Sustainable Materials, Systems and Structures (SMSS2019) New Generation of Construction Materials
Editor(s): Marijana Serdar, Nina Štirmer, John Provis
ISBN: 978-2-35158-217-6,
Vol 1. ISBN: 978-2-35158-223-7
e-ISBN: 978-2-35158-218-3
Publisher: RILEM Publications SARL
Publication year: 2019
Pages: 60-67
Total Pages: 8
Language : English

Abstract: Microsurfacing has been known to retard deterioration and increase the service life of the pavement by 3 to 8 years for relatively heavy traffic and could be considerably longer for low to medium traffic. In the state of Assam, the Assam PWD took up some stretches in Guwahati and Tezpur to resurface the road with microsurfacing. In order to understand the laboratory performance of such mixes with commercially available emulsion, a study is carried out on aggregate collected from three districts of Assam - Kamrup, Baksa and Udalguri respectively. Property of aggregate required for microsurfacing is carried out, and its rock classification is made. It was observed that aggregate from Kamrup and Baksa districts could pass the specifications and is of one rock type. However, the aggregate from Udalguri district over shoot the Los Angeles Abrasion Test by 4 points and composed of five rock types. Laboratory studies on microsurfacing mix at different pure asphalt requirements(PAR) was carried out on consistency test, Wet Track Abrasion Test (WTA), Loaded Wheel Test (LWT), cohesion test and compatibility test with the additives, C500, E11 and C540 respectively that are either individually or combinedly added to the emulsion. Based on the studies, it was observed that water required for consistency is the lowest with Udalguri aggregate ranging from 3% to 5.5% with the additives. Mix with Udalguri aggregate was found to pass the specification of WTA at the highest PAR with the different additives. With LWT and cohesion test, again Udalguri aggregate has been found to pass the required cycles and the required 30-minute and 60-minute torque whereas, Baksa aggregate was found to pass only the 30-minute torque. With respect to compatibility of aggregate with emulsion, Baksa and Udalguri aggregates was found to score 12 points with all additives. However, Kamrup aggregate could score 11 points with only the combined additives.

Online publication : 2019
Publication type : full_text
Public price (Euros) : 0.00

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