Environmental Impact of Calcium Sulfoaluminate Cement Manufacturing: An Indian Case Study

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Piyush Chaunsali
Ravindra Gettu
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Ordinary portland cement (OPC) manufacturing contributes to about 5–8% of the CO2 emissions globally and its consumption is expected to increase. Finding alternative to OPC is a global issue in the recent times. Calcium sulfoaluminate (CSA)-based binder is gaining attention due to the lower requirement of limestone and temperature requirement during its production. There are several lab-scale studies where CSA has been produced using different alternative raw materials. In this study, earlier research works were reviewed to understand the different types of raw materials used to produce CSA. The data for cement production was collected from a cement plant in India to conduct a life cycle assessment (LCA). Two hypothetical cases of CSA production were assumed in the same cement plant, and environmental impacts were calculated in terms of CO2 emissions and energy consumed. It was found that with the change in alternative raw materials, the impact could vary from 460 to 590 kg CO2 per tonne of CSA. Generally, 30–45% of CO2 emissions reduction was observed when compared to Portland cement, whereas the substantial change in energy consumption was not evident. Transportation distance of raw materials seemed to be critical with respect to energy consumed.
Calcium sulfoaluminate cement, CO emissions 2, Environmental impact, LCA