01661025

Component

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.

This paper was sponsored by TRB committee AFN20 Standing Committee on Properties of Concrete.

18-01658

English

5p

2018

Transportation Research Board 97th Annual Meeting

Digital/other

References

Cement; Composite materials; Ductility; Engineered materials; Fly ash; Local materials; Strength of materials

Engineered cementitious composites

Louisiana

Highways; Materials; Pavements

Transportation Research Board Annual Meeting 2018 Paper #18-01658

TRIS, TRB, ATRI

Jan 8 2018 10:25AM