Abstract
This experimental study investigated the effects of polyvinyl alcohol (PVA) and copper-coated steel (CCS) on the mechanical properties and the post cracking behavior of fiber reinforced concrete (FRC). In designing high-performance concrete mixes, cement replacement materials are the essential ingredients. Therefore, the research objective was to investigate PVA and CCS fiber’s post-cracking performance in 100% cement concrete and concrete with 80% cement and 20% fly ash. The fiber content was fixed as a 0.3% volumetric fraction. CSS fibers required 15% more superplasticizer to achieve the desired slump of fresh concrete than the PVA fibers. Simultaneously, CCS fibers showed a 10% higher compressive strength than the concrete made of PVA fibers. Both fibers exhibited a similar effect in developing tensile and flexural strength. PVA fibers showed a value of 47 Gpa of secant modulus, and CCS fibers resulted in 37 Gpa in 100% cement concrete. In post-cracking behavior, CCS fibers showed better performance than the PVA fibers. The reason for this is that CCS showed 2.3 times the tensile strength of the PVA fibers. In comparing the two concretes, fly ash concrete showed about 10% higher compressive strength at 56 days and about 6% higher tensile and flexural strength. Similarly, fly ash concrete showed more than 15% first crack strength and flexural toughness than the 100% cement concrete in post-cracking behavior. Fiber-reinforced concrete containing PVA or CCS fibers showed enhanced post-cracking characteristics and its use could be preferred in structural applications.
Highlights
Due to global pressure on achieving sustainability, many industries and disciplines are facing challenges in coping with sustainable development demands
This study aims to investigate the effects of low volume fraction (0.3%) of Polyvinyl Alcohol (PVA) and Copper Coated Steel (CCS) fibers on the mechanical properties, modulus of elasticity, ductility, and concrete post cracking characteristics
The control mix containing fly ash (CF) included a lower dosage of superplasticizer (0.25%) than that added to the 100% cement mix (CM), which was 0.35% for obtaining the targeted slump of concrete
Summary
Due to global pressure on achieving sustainability, many industries and disciplines are facing challenges in coping with sustainable development demands. In this regard, the concrete making industry faces enormous challenges because concrete is the second-largest consumable materials on the planet [1]. In the last few years, successful efforts have been made in achieving the ultra-high strength of concrete by varying the water to cement ratio and by the use of new generation admixtures. Achievement of ultra-high-strength concrete resulted in increased brittleness when subjected to adverse conditions, which is one of its drawbacks regarding its long-term performance [1]
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