Please use this identifier to cite or link to this item: https://scholarbank.nus.edu.sg/handle/10635/226782
Title: A FEASIBILITY STUDY ON THE MARINE ALGAE AS A PARTIAL CEMENT REPLACEMENT MATERIAL FOR DEVELOPING SUSTAINABLE CONCRETE
Authors: LIEW XINYI
Keywords: Marine Algae
Algae Biochar
CO2 Absorption Test
Carbonation Curing
Carbon Sequestration
Compressive Strength Test
Mechanical Performance
Issue Date: 2022
Citation: LIEW XINYI (2022). A FEASIBILITY STUDY ON THE MARINE ALGAE AS A PARTIAL CEMENT REPLACEMENT MATERIAL FOR DEVELOPING SUSTAINABLE CONCRETE. ScholarBank@NUS Repository.
Abstract: Carbon sequestration is well-known for its effectiveness in reducing the carbon emissions generated by the construction industry. Marine algae as one of the most effective carbon sequestration materials with its exceptional ability to fix CO2 has recently attracted considerable interest worldwide to convert it into biochar, a green additive in cement-based composites. CO2 curing has been found to accelerate carbonation more effectively by improving the bonding strength and the densification of the carbonates, which substantially enhance the mechanical strength and carbon sequestration. Thus, the combined use of marine algae biochar and the CO2 curing method could be a green technology for enhancing the properties of cement-based composites. Therefore, this paper aims to investigate the feasibility of the algae biochar and raw algae powder as partial cement replacement admixtures in the cementitious mortar based on their ability to sequester carbon as well as the effect on the compressive strength with carbonation curing through the CO2 absorption test and compressive strength test. It was concluded from the study that carbonation curing had increased the average 7th-day compressive strength at 63%, 16%, 28% and 20% for all four combinations (BAB, GAB, BAP, GAP) compared to the non-cured samples. However, there was a reduction in strength reported in the absence of carbonation treatment due to the diminution of cement content in cementitious mixtures. A considerable CO2 absorption rate at an average of 12mg/hour was reported in this study as well. These results have been believed to provide possibilities for deploying marine algae into cementitious mixtures for future studies.
URI: https://scholarbank.nus.edu.sg/handle/10635/226782
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