Mishra, K. and Behra, S.K. and Prashant , Singh and Buragohain, J. and Hazra, B. and Mandal, S. K. and Kumar , Ritesh (2025) Experimental Investigation on the Mechanical and Microstructural Properties of Cemented Coal Ash Based Paste Backfill Reinforced with Polypropylene Fibre. Indian Geotechnical Journal.

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Abstract

Ordinary-cemented paste backfill (CPB) has low stiffness and tensile strength. Several studies have reported pre-eminence of polypropylene (PP) fibre in improving such characteristics. The efficacy of PP fibre as a reinforcement for mine tailing-based CPB is widely explored but for coal ash-based CPB is not investigated. Therefore, through present study, the significance of PP fibre on the mechanical and microstructural characteristics of CPB prepared with coal ash was investigated. Through repeated experimental trials, the optimum solid concentration for CPB was fixed at 75wt.%. The fibre was subsequently added from 0.1‒0.5% of total dry solid weight. The results show that reinforcement did not have any trend with the slump but increased the rate of water loss through evaporation. In compare to CPB specimens without fibre, the specimens with 0.5% fibre showed enhancement in UCS by 185% (7 days), 128% (14 days), and 81% (28 days). The failure pattern of CPB was transformed from brittle to ductile through fibre reinforcement. Increasing fibre proportion from 0 to 0.5% augmented the elastic modulus by 37%, 25.4%, and 36.4%, tensile strength by 138.89%, 105.57%, and 93.61%, and failure strain by 90.5%, 86.7%, and 75% for the CPB specimens tested after 7 days, 14 days, and 28 days of curing, respectively. The SEM analyses revealed the fibre bridging impact in view of lessen pores, better compactness, integrity, and fibre-matrix bond. The present investigation could improve the ground conditions during underground winning of coal and provide a new theoretical reference for coal ash-based paste backfill mining.

Item Type:	Article
Uncontrolled Keywords:	Cemented paste backfill Polypropylene fibre Coal ash Reinforcement UCS Tensile strength
Subjects:	Mine Stowing and Filling
Divisions:	UNSPECIFIED
Depositing User:	Mr. B. R. Panduranga
Date Deposited:	22 Apr 2025 10:50
Last Modified:	22 Apr 2025 10:50
URI:	http://cimfr.csircentral.net/id/eprint/2781

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