Correlation of sustainable material in concrete with compressive strength of grade 25 with metakaolin

Teo, Chung Jing (2024) Correlation of sustainable material in concrete with compressive strength of grade 25 with metakaolin. Final Year Project, UTAR.

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Abstract

Rapid urbanization and population growth have led to a surge in demand for concrete structures and exacerbating environmental issues such as wastage pollution and greenhouse gas emissions. Plastic wastes were the most serious caused of the environmental impact. Hence, this study aims to investigate the usage of sustainable waste materials and pozzolanic materials in the concrete design to achieve the sustainable development goal. Polyethylene Terephthalate (PET) and Metakaolin (MK) was adopted in concrete mix design as PET was the most produced waste plastic among all the plastic types. The effect and incorporation of PET flakes replacing coarse aggregates and MK replacing OPC in concrete mix was determined in terms of fresh properties and hardened properties of concrete, such as slump test, density determination, compressive and splitting tensile strength test. Firstly, during trial mix, both CTR and PET�5 with different W/C ratio was prepared and the concrete mix with W/C ratio of 0.6 was selected to be optimal concrete mix design for further experimental work as both CTR and PET-5 had achieved the desired strength of 25 MPa. In Phase 2, three design concrete mixes were prepared with different percentages of PET replacement from range 5 % to 15 % with interval of 5 %. Thus, PET�10 was selected as optimal concrete mix design and adopted in Phase 3. In Phase 3, PET-10 was mixed with different percentages of MK replacement from 5 % to 10 % with interval of 2.5 %. PET-10 +MK-7.5 exhibited the greatest compressive strength of 37.71 MPa by increased 27 % of PET-10 with compressive strength of 29.71 MPa due to the pozzolanic effect of MK that can increase the concrete strength. Furthermore, the microstructural analysis, such as SEM-EDX and XRD analysis, were performed to investigate the chemical composition of the designed concrete. Consequently, the PET-10 + MK-7.5 was the optimal design concrete mix to achieve the sustainability goal and concrete strength of 25 MPa.

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