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Mechanical Properties of Sustainable High Strength High Ductility PE-ECC at Elevated Temperatures
Mahmoudi, Fardin
Mahmoudi, Fardin
Date
2022-08
Author
Advisor
Type
Thesis
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Description
A Master of Science thesis in Civil Engineering by Fardin Mahmoudi entitled, “Mechanical Properties of Sustainable High Strength High Ductility PE-ECC at Elevated Temperatures”, submitted in August 2022. Thesis advisor is Dr. Jamal Abdalla and thesis co-advisor is Dr. Rami Haweeleh. Soft copy is available (Thesis, Completion Certificate, Approval Signatures, and AUS Archives Consent Form).
Abstract
Engineered cementitious composite (ECC) is a family of high-performance fiber reinforced cementitious composites (HPFRCC) with multiple cracking and significant strain-hardening behavior. In terms of structural performance at ambient temperatures, ECC has distinguished itself as a superior building material, outperforming conventional concrete. However, its fire performance is still not well known. Additionally, polyethylene-based ECC (PE-ECC) received the least attention in the literature in assessing its residual mechanical properties at elevated temperatures. This research investigated the effect of elevated temperature on the residual mechanical properties of high strength and high ductility (HSHD) PE-ECC. For sustainability considerations, GGBS was employed as a cement replacement at ratios of 40%, 60%, and 80% in the casting of specimens. The experiment results revealed that a higher mass loss caused a higher residual compressive strength. The samples with an 80% replacement ratio showed the highest residual compressive strength at all temperature exposures, with cubes retaining 51% and 34% of their original compressive strength at 600 °C and 800 °C, respectively. All dogbones and prisms tested in this study showed multiple cracking and strain/deflection-hardening behaviors up to 200 °C. At 200 °C, the average tensile strength and the average strain capacity of dogbone specimens ranged between 9.30-6.63 MPa and 7.11-4.03%, respectively. A GGBS replacement level of 60% resulted in a higher tensile strain capacity than the 80% replacement level at all temperature exposures. The average flexural strength of specimens was reduced as the GGBS replacement increased from 40% to 80%. Furthermore, the samples with the highest GGBS replacement showed higher ultimate deflections. Empirical equations were obtained for the residual compressive strengths of PE-ECC cubes, and FE models were developed that effectively predicted the PE-ECC specimens’ ultimate tensile and flexural loads.