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Standards Development
This document provides guidelines for the calculation of carbon footprints for calcium silicate cement (CSC) products. It specifies principles, system boundaries, functional units, data requirements, and calculation procedures for assessing greenhouse gas (GHG) emissions and removals associated with the production and use stages of CSC products.
The guideline includes provisions for accounting CO uptake through carbonation and reaction hardening processes unique to calcium silicate systems. It aims to ensure consistency, transparency, and comparability in the quantification and reporting of carbon footprints among CSC producers and users
Recently, as carbon neutrality has become a major global agenda for greenhouse gas reduction, international carbon trade mechanisms such as the EU’s Carbon Border Adjustment Mechanism (CBAM) and the G7’s Climate Club are being reinforced. The cement industry—including clinker, Portland cement, calcined clay, and alumina cement—has been identified as one of the key sectors subject to carbon taxation and mandatory reporting of direct and indirect emissions.
Calcium silicate cement(CSC) products are emerging as innovative low-carbon alternatives to conventional portland cement, which including clinker, portland cement, calcined clay, and alumina cement. Calcium silicate cement exhibit unique reaction hardening and CO uptake characteristics that can substantially reduce net emissions through mineral carbonation during curing and service life. However, current international standards do not provide specific guidance for quantifying CO reduction or accounting for the complex balance between embodied and absorbed carbon in calcium silicate cement systems.
Therefore, this proposal aims to establish a standardized defensible methodology for calculating the carbon footprint of selected areas and specific pruducts. The guideline will define system boundaries, data requirements, and calculation procedures tailored to the reaction-based CO sequestration mechanisms of calcium silicate cement.
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