Abstract
The aim of this study was to investigate the engineering characteristics of different mixes of copper slag and fly ash stabilised with lime or cement for use as a base layer of flexible highway pavements. The effects of fly ash content, binder content, curing period and wetting–drying cycles on unconfined compressive strength (UCS), indirect tensile strength (ITS), resilient modulus and permanent strain were studied. The ITS was found to be 17 and 18% of the UCS for a mixture of lime and cement, respectively. Mixes with 6% lime or cement content, which were found to satisfy both the strength and durability criteria suggested by the Indian Road Congress, are therefore recommended for use in the base layer of flexible road pavements. The fitting of different existing models for predicting resilient modulus and permanent strain was compared and constants of the best-fitting model are presented. On the basis of a finite-element analysis of a five-layer flexible pavement system, pavements with mixes of copper slag, fly ash and lime or cement in the base layer were found to have up to 78 and 55%, respectively, higher service life compared with pavements with wet-mix macadam as the base material.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: Proceedings of the Institution of Civil Engineers - Construction Materials
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
