The effectiveness of carbon dioxide sequestration due to different aggregate size of carbide slag pellets and the mix ratio

• Main Author: Chen, Darryl Miles
• Other Authors: Qian Shunzhi
• Format: Final Year Project
• Language: English
• Published: Nanyang Technological University 2022
• Subjects: Engineering::Civil engineering
• Online Access: https://hdl.handle.net/10356/160105
• Institution: Nanyang Technological University

All around the world, the demand for concrete is always on the rise as the world keeps on innovating and the taste and preferences of the people keeps on changing as the standard of living increases. Previously, where the world was filled with greens such as trees and plants are now replaced with tall skyscrapers and roads which allows people to commute. With the increasing demand of concrete, the demand for cement, a main material to produce concrete, also increases. However, the production of cement causes the emission of carbon dioxide (CO2) which contributes to the environmental issues. Hence, there is a need to battle this problem while meeting the demand of cement production. There are plenty of methods to reduce the CO2 footprint of cement production but the main focus of this study will be the capturing and storing of CO2. Carbide slag residue (CCR), which is an industry by-product waste, can capture carbon dioxide. Thus, in this study, the main goal is to determine the feasibility of using CCR pellets to fulfil the role as an aggregate for the production of concrete has been investigated. Concrete samples of different aggregate sizes and different mix designs were casted and tested for the mortar properties such as compressive strength and thermal conductivity. In addition, the CO2 sequestration efficiency of the different pellets of aggregate sizes, carbide slag (CS) pellets and CS powder was also determined. It can be concluded that concrete that is made out from the optimal mix design and aggregates sizes will reduce CO2 footprint in the concrete/cement industry. Hence, making the industry more sustainable and environmentally friendly.