Green concrete production via waste iron powder carbonation
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Date
2020-10-10
Authors
Saabneh, Diala
Shadid, Mohammad
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Abstract
Abstract
This project is prepared as a graduation project in material science and engineering. The project focused on producing a new environmentally friendly concrete. The new product formed by carbonation of iron waste (in form of powder or filings) with addition of sand, clay, glass and slaked lime and presence of water. Iron powder and filings are abundant industrial waste. The main benefit of the product presented in disposing iron filings and glass wastes and the use of CO2 gas as a carbonation reaction medium which aims to reduce its emissions in the atmosphere. The production of ordinary Portland cement is responsible to over 5% of all CO2 emissions. In this case, the project would avoid the amount of CO2 produced in the conventional cement and further absorbing extra amount of CO2 and subsequently reducing the CO2 emissions. The reaction is done in a high pressure reactor system. It allows for high pressure or flow through conditions. Optimization of different parameters (PCO2, temperature, time, particle size, flow rate, pH, and mortar chemistry and mineralogy) controlling the carbonation process shall be pursued. These parameters will affect the rate and extent of carbonation as well as the properties of the product. Mechanical and chemical testing of products should be done. In the first chapter of this project, two samples were prepared and tested. The first sample was placed under static pressure condition. The sample crumbled after the experiment. The second was placed under flow through condition. It shows that a reaction occurred; this was manifest by an increase in sample volume. Further characterization shall be done with both XRD and SEM/EDX to determine if iron had carbonated and what form of mineral phases appeared in the sample.