Effect of Inappropriate Binder Grade Selection on Initiation of Asphalt Pavement Cracking

Rodgers Mugume and Denis Kakoto
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Rodgers Mugume: Civil Engineering and Asset Management, Transport Research Laboratory, Wokingham, Berkshire RG40 3GA, UK
Denis Kakoto: Technical Audit, Uganda National Roads Authority, Kampala P.O. Box 28487, Uganda

Sustainability, 2020, vol. 12, issue 15, 1-18

Abstract: This paper is aimed at assessing in-service asphalt pavement cracking in order to fully understand its causes as well as reviewing the possible impact of implementing a new mix design method on failures observed. Field and laboratory investigations were conducted as well as a review of design and construction records. Substitution of a Performance Grade (PG) binder with straight run pen grade binder without performing independent Superpave PG verification tests greatly contributed to cracking. A 20/30 pen grade binder which was utilised had already undergone some change in its properties since its manufacture and therefore did not provide the required workability and crack resistance that it would otherwise have been expected to provide. Target mixing and compaction temperature ranges during construction were higher than those recommended confirming that the binder used had already undergone a change in its physical and chemical characteristics between the time of its manufacture and use. Additionally, a lapse in quality control and assurance during asphalt production and laying resulted in a highly voided wearing course which exacerbated the situation.

Keywords: cracking; mix design; superpave; asphalt concrete; bitumen; air voids; pavement performance (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2020
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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