LC3: Limestone Calcined Clay Cement

Imagine a blended cement, distinct from the PPC and PSC blends covered elsewhere on this site, that replaces even more of the carbon-intensive clinker with a combination of limestone and calcined clay, low-grade clay heated to a specific temperature to activate its chemical reactivity, achieving roughly 40% lower carbon emissions than conventional Portland cement while genuinely maintaining comparable strength and durability. Limestone Calcined Clay Cement, LC3, represents exactly this next-generation blended cement technology.

LC3's genuine appeal lies in using widely available, low-grade raw materials, ordinary clay deposits considerably more abundant and geographically distributed than the specific high-quality materials some other cement innovations require, meaning LC3 production doesn't face the same raw material scarcity constraints that might otherwise limit how widely a lower-carbon cement technology could actually scale across India's diverse regional cement industry.

JK Lakshmi Cement's January 2026 commercial launch of Green PRO LC3 at its Sirohi, Rajasthan plant represents one of India's first genuinely commercial-scale LC3 rollouts, moving the technology from research and pilot demonstration into actual market availability, a genuinely significant milestone given how much cement industry innovation historically remains stuck at the pilot stage without ever reaching commercial production volume.

This LC3 development connects directly to the Carbon Credit Trading Scheme covered elsewhere on this site, technologies like LC3 give cement producers a genuine, concrete pathway toward meeting their CCTS emission intensity targets, rather than relying purely on operational efficiency improvements or purchased carbon credits, exactly the kind of genuine technological decarbonisation option the scheme's binding targets are specifically designed to incentivise producers toward developing and adopting at scale.