Testing And Evaluation Of Self-consolidating Concrete (SCC) Using Volcanic Aggregates
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2023
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University of Hawaii at Manoa
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Self-consolidating concrete (SCC) flows under its own weight, passes through intricate geometrical configurations, and fills the formwork without vibrating or consolidating. In comparison with conventional concrete mixes, SCC should be closely controlled in terms of its composition and rheological properties to meet the fresh property requirements simultaneously. However, large-scale applications and acceptance have not yet been well-established in Hawaii for SCC materials. The problem can be attributed to Hawaii's unique aggregate, which is locally mined and crushed with absorption capacities ranging from 1 to 5%. Because volcanic aggregate has different absorption capacities, gradations, and textures than mainland aggregate, conventional SCC mix designs will not work. As a result, this study examined how aggregate properties affect SCC rheology. It was found that higher aggregate volume, higher fine aggregate to coarse aggregate ratio, smaller aggregate size, and lower aggregate packing density may increase the yield stress of the SCC mixture. Aggregate size had an insignificant effect on plastic viscosity. SCC mixes were also studied for their mechanical and durability properties to ensure their sustainability. Furthermore, since the rheological properties of SCC have been proven in Chapter 2, machine learning models were conducted to predict plastic viscosity. During the last phase of this project, liquid carbon dioxide admixture was used to test concrete carbon neutrality in the field. According to the research, CO2 admixtures do not adversely affect the fresh, mechanical, or durability properties of concrete, and they may be useful for carbon sequestration in the construction industry.
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Civil engineering
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