Stress-crack Separation Relationship for Macrosynthetic, Steel an Hybrid Fiber Reinforced Concrete

Author(s): Chiranjeevi Reddy Kamasani, Jayakrishnan R. and Kolluru V. L. Subramaniam
Paper category: Proceedings
Book title: Proceedings of International Conferences (ICACMS) Advances in Construction Materials and systems Vol 2
Editor(s): Manu Santhanam, Ravindra Gettu, Radhakrishna G. Pillai, Sunitha K. Nayar
ISBN: 978-2-35158-194-0
e-ISBN: 978-2-35158-191-9
Publisher: RILEM Publications SARL
Publication year: 2017
Pages: 304-311
Total Pages: 8
Language : English

Abstract: An experimental evaluation of the crack propagation and post-cracking response of macro fiber reinforced concrete in flexure is conducted. Two types of structural fibers, hooked end steel fibers and continuously embossed macro-synthetic fibers are used in this study. A fiber blend of the two fibers is evaluated for specific improvements in the post peak residual load carrying response. At 0.5% volume fraction, both steel and macrosynthetic fiber reinforced concrete exhibits load recovery at large crack opening. The blend of 0.2% macrosynthetic fibers and 0.3% steel fibers shows a significant improvement in the immediate post peak load response with a significantly smaller load drop and a constant residual load carrying capacity equal to 80% of the peak load. An analytical formulation to predict flexure load-displacement behaviour considering a multi-linear stress-crack separation (σ-w) relationship is developed.An inverse analysis is developed for obtaining the multi-linear σ-w relation, from the experimental response. The -w curves of the steel and macrosynthetic fiber reinforced concrete exhibit a stress recovery after a significant drop with increasing crack opening. Significant residual load carrying capacity is attained only at large crack separation. The fiber blend exhibits a constant residual stress with increasing crack separation following an initial decrease. The constant residual stress is attained at a small crack separation.

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