Fracture Energy Optimization in Synthetic Fiber Reinforced Cementitious Composites

1990 ◽  
Vol 211 ◽  
Author(s):  
Victor C. Li ◽  
Youjiang Wang ◽  
Stanley Backer
Keyword(s):  
Fracture Energy ◽  
Tensile Behavior ◽  
Model Systems ◽  
Synthetic Fiber ◽  
Fracture Mechanisms ◽  
Cementitious Composites ◽  
Fiber Reinforced ◽  
Cracking Behavior ◽  
Pull Out ◽  
Fiber Reinforced Cementitious Composites

AbstractA study has been carried out on cementitious composites reinforced with various synthetic fibers, focusing on their tensile behavior, toughness, and fracture mechanisms. A model is formulated to predict the tensile behavior and fracture energy of fiber reinforced cementitious composites (FRC) with short, randomly distributed fibers. The model accounts for the pull-out of fibers oblique to the fracture surfaces (including snubbing friction effect), and the variation of the fiber/matrix interfacial shear stress during pull-out. Experimental and analytical results are shown to be in close agreement for the one class of fiber reinforcement which best satisfies the assumptions of the model. Systems which violate the assumptions exhibited different failure mechanisms and were observed to show less satisfactory reinforcement performance, especially the composite fracture energy. The model is used to examine the effect of fiber properties on composite post-cracking behavior and is useful in design of such material systems with optimum performance and cost effectiveness.

scholarly journals Self-Healing Potential and Post-Cracking Tensile Behavior of Polypropylene Fiber-Reinforced Cementitious Composites

2021 ◽  
Vol 5 (5) ◽  
pp. 122
Author(s):  
Mohit Garg ◽  
Pejman Azarsa ◽  
Rishi Gupta
Keyword(s):  
Volume Fraction ◽  
Peak Load ◽  
Polypropylene Fiber ◽  
Cementitious Composites ◽  
Self Healing ◽  
Fiber Reinforced ◽  
Cracking Behavior ◽  
Micro Scale ◽  
Macro Scale ◽  
Fiber Reinforced Cementitious Composites

The use of synthetic fibers as reinforcement in fiber-reinforced cementitious composites (FRCC) demonstrates a combination of better ductile response vis-à-vis metallic ones, enhanced durability in a high pH environment, and resistance to corrosion as well as self-healing capabilities. This study explores the effect of macro- and micro-scale polypropylene (PP) fibers on post-crack energy, ductility, and the self-healing potential of FRCC. Laboratory results indicate a significant change in fracture response, i.e., loss in ductility as curing time increases. PP fiber samples cured for 2 days demonstrated ductile fracture behavior, controllable crack growth during tensile testing, post-cracking behavior, and a regain in strength owing to FRCC’s self-healing mechanism. Different mixes of FRCC suggest an economical mixing methodology, where the strong bond between the PP fibers and cementitious matrix plays a key role in improving the tensile strength of the mortar. Additionally, the micro PP fiber samples demonstrate resistance to micro-crack propagation, observed as an increase in peak load value and shape deformation during compression and tensile tests. Notably, low volume fraction of macro-scale PP fibers in FRCC revealed higher post-crack energy than the higher dosage of micro-scale PP fibers. Lastly, few samples with a crack of < 0.5 mm exhibited a self-healing mechanism, and upon testing, the healed specimens illustrated higher strain values.

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