2019 CSCE Annual Conference - Laval (Greater Montreal)

2019 CSCE Annual Conference - Laval (Greater Montreal) Conference


Title
Performance of Engineered Cementitious Composites Utilizing Locally Available Materials in the State of Louisiana


Author(s)
Mr. Hassan Noorvand, LSU
Dr. Gabriel Arce
Dr. Marwa Hassan, LSU (Presenter)
Dr. Tyson Rupnow
Abstract

Engineered cementitious composites (ECC) are steady-state multiple cracking strain-hardening cementitious materials that significantly enhance ductility and tensile strength of traditional cement-based materials.  This investigation focuses on the development of ECC utilizing locally available materials in the state of Louisiana.  The influence of high contents of fly ash (up to 81% cement replacement) and low Polyvinyl Alcohol (PVA) fiber content (1.5% volume fraction) were investigated for cost-effectiveness of the composite.  Compressive and third-point bending tests were conducted to characterize the mechanical properties of PVA-ECC mixes produced at different levels of matrix/interface tailoring.  Experimental results demonstrated the feasibility of producing ECC exhibiting robust strain-hardening behavior with locally available materials in the state of Louisiana and low fiber content (1.5% volume fraction of PVA fibers). Furthermore, results suggested that increasing cement replacement with fly ash favored ductility of the composites. Yet, compressive, and flexural strength were reduced suggesting a trade-off between strength and ductility. Moreover, specimens with the highest cementitious matrix strength (specimens produced with the lowest fly ash content) did not exhibit strain-hardening behavior but a strain-softening performance similar to that of fiber reinforced concrete (FRC). Strain-softening behavior was attributed to an excessive matrix strength that did not allow the strength or energy criteria to be met.