Rishabh Kumar

ORCID Identifier(s)

0000-0002-5056-0546

Graduation Semester and Year

2021

Language

English

Document Type

Thesis

Degree Name

Master of Science in Civil Engineering

Department

Civil Engineering

First Advisor

Nur Yazdani

Abstract

This research focuses on the effects of hybridizing self-consolidating concrete (SCC) using steel (SF) and polypropylene (PP) fibers to study their benefits post-fire exposure. In an attempt to reduce cement’s environmental impacts and to make concrete more sustainable, this research also studies the substitution of cement using glass pozzolan. Limited research has been done in this regard previously, hence this research makes an effort to bridge the enormous knowledge gap. No research has reported tensile, compressive, and flexural strength of SCC with hybrid fibers and glass pozzolan, making this research unique. Based on previous research, the replacement rate of cement by glass pozzolan used is 20%. The dosage rates of steel and polypropylene fibers are 3.5 lb./yd3 and 1.5 lb./yd3. Four different SCC mixes are designed with different combinations of glass pozzolan and hybrid fibers. A total of 12 beams (three for each SCC mix) and 24 cylinders (six for each SCC mix) are tested as per ASTM standards. Out of the 12 beams, four were tested at room temperature and the remaining eight were tested after 30 minutes of fire exposure as per the ASTM E119 (2019) standards. Similarly, eight cylinders were tested at room temperature and the rest after fire exposure. No benefits of adding hybrid fibers were observed for compressive strength at both room and elevated temperatures. The split tensile strength of cylinders after fire exposure was found to be higher for the specimens containing hybrid fibers. At room temperature, the flexural strength of control SCC was found to be the highest while other mixes reported lesser strength. Post-fire exposure, the flexural strength of mixes containing hybrid fibers reported much better strength than control specimens. Also, brittle failure observed at room temperature was found to be ductile at elevated temperatures for mixes containing hybrid fibers and/or glass pozzolan. Fibers did not aid these strength parameters at room temperature but had better results post-fire exposure.

Keywords

Hybrid fiber reinforced self-consolidating concrete, Steel fibers, Polypropylene fibers, Fire exposure, SCC, Fire performance, Glass pozzolan

Disciplines

Civil and Environmental Engineering | Civil Engineering | Engineering

Comments

Degree granted by The University of Texas at Arlington

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