Material Science Full Assignment (2) - Assignment Title Production of Cement from Recycling CO2 via Calera Process Subject UEME 1122 Material Science

Material Science Full Assignment (2) - Assignment Title...

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Assignment Title: Production of Cement from Recycling CO 2 via Calera Process Subject: UEME 1122 Material Science Course: CL and ME Date of submission: 04-08-2016 Name of Lecturer: Dr Thiam Hui San Name of Student Student ID No Year and Semester Ramesh A/L Segaran 1500036 Y1S2 Roland Goh Hon Wei 1501017 Y1S2 Tan Yi Xiang 1503431 Y1S1 Chee Wai Kit 1504740 Y1S1 Saravanan Raj A/L Pariyasamy 1600167 Y1S2 Received by: Dr Thiam Hui San Date: 04/08/2016 Lecturer
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Contexts 1. Introduction 2. Report Body 2.1 Properties of Alite 2.2 Raw Materials for Manufacturing Alite 2.3 Manufacturing Pathway of Alite via Calera Process 2.4 Energy Usage for Manufacturing Alite 2.5 Effect of the Calera Process 2.6 Durability of Recycled Cement 3. Conclusion 4. References
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Introduction The word ‘Calera’ came from a Spanish word which means as lime quarry. The idea of this process was first proposed by Brent Constantz in the year 2007. He have shared his plan to an Indian/American billionaire, Vinod Khosla who is interested in a clean technology and the idea was encouraged by him. Calera process is a process which uses the carbon dioxide that’s emitted to the air to produce cement which known as ‘green cement’. As we all know, carbon dioxide is the main contributor to the greenhouse effect that causes global warming and production of concrete makes up to 5% of total carbon footprint on earth (WBCSD, 2005). Therefore, Calera process was presented as a solution to tackle the high carbon emissions from concrete production. Currently, Portland cement is widely used in most construction sites and throughout the world. In order to produce Portland cement, about 36 billion tons of limestone are mined a year. Countless energy lost and emissions of carbon dioxide in the air is increasing gradually as mining of limestone becomes more rapid. Constant supply of limestone is needed due to the booming population and the high demand to create more living space with concrete. Mining of limestone has also set to produce large air pollution to surrounding environments. In order to reduce the usage of Portland cement or have a better alternative to traditional Portland cement, Calera process which produces calcium carbonate can alternatively replace the use of limestone. Portland cement is the basic ingredient for concrete. Cement is manufactured through a closely controlled chemical combination of calcium, silicon, aluminum,
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iron and other ingredients. The main ingredient in Portland cement is alite which is known as calcium carbonate. The method that is used commonly to manufacture Portland cement is through the dry method, where it involves in quarrying the rock and mixing it with the iron ore which is then fed to the cement kiln. The cement kiln heats the ingredient at a temperature about 2700 degree Fahrenheit which is about 1482.22 degree Celsius. In the cement kiln, some elements are driven off in the form of gases which known as carbon dioxide gas. In order to reduce the emission of the carbon dioxide gas to the air, Calera process is introduced. It was also proven of its capability to bring a proper alternative to Portland cement.
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  • Calcium carbonate, Portland cement, Calera Process

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