Effect of Slag Addition and Rate of Loading on Fibre Pullout in Alkali- Activated Fly Ash-Based Materials

Author(s): Mohammed Farooq, Aamer Bhutta and Nemkumar Banthia
Paper category: Proceedings
Book title: Proceeding of the 71st RILEM Annual Week & ICACMS 2017
Editor(s): Manu Santhanam, Ravindra Gettu, Radhakrishna G. Pillai, Sunitha K. Nayar
ISBN:978-2-35158-195-7, 978-2-35158-190-2 (Set)
e-ISBN: 978-2-35158-191-9
Publisher: RILEM Publications SARL
Publication year: 2017
Pages: 19-28
Total Pages: 10
Language : English

Abstract: Several attempts have been made to counter the brittle nature of alkali activated materials by addition of fibres, however, the fundamental understanding of fibre-matrix bond & mechanism is still lacking. Single fibre pullout tests were performed to determine the fibre-matrix bond and to understand the toughening mechanisms in alkali-activated fly ash-based mortars (AAFMs) in this study. The effects of slag addition, rate of loading (quasi-static and dynamic) and curing on fibre pull-out behavior of AAFMs reinforced with different fibers were evaluated. Steel (straight, end-deformed, length-deformed) and polypropylene enddeformed fibers have been investigated. Slag was replaced as 0% and 20% of the total binder (fly ash) and activated by alkaline solutions. Dogbone specimens were prepared and cured at ambient (23°C) for 7-day and elevated temperatures (60°C) for 1-day plus 6-day ambient cure. The results were compared to the bond-slip behavior of the same fibers in an ordinary portland cement (OPC) mortar under control condition. Partial replacement of fly ash by slag (20%) has shown to improve the strength and interfacial bond properties of these materials. AAFMs in general had a far superior interfacial bond compared to the OPC counterparts. The overall performance under dynamic loading is observed to improve for most fibre-binder combinations.

Online publication :2017
Publication type :full_text
Public price (Euros) : 0.00