From cement replacement and PT efficiency to slab optimisation and EPDs, here are the practical levers that cut embodied carbon in an RC or PT frame without blowing the budget.
Start with the concrete mix
The biggest single carbon lever in a frame is cement. Replacing a portion of Portland cement with GGBS or fly ash cuts embodied carbon substantially, with implications for early strength and striking times that a good contractor will plan around rather than resist.
Optimise the structure, not just the material
Using less concrete is as powerful as using greener concrete. PT efficiency, right-sized slabs, voided systems and sensible grids all reduce volume. The carbon you never pour is the carbon you never have to offset.
Measure it: EPDs and as-built data
You cannot manage what you do not measure. Environmental Product Declarations for the mix and reinforcement, plus as-built quantities, let you report real embodied carbon rather than estimates — increasingly a planning and client requirement, not a nice-to-have.
The budget reality
Most of these levers are cost-neutral or close to it when planned early. Bolted on late, they add cost and friction. The cheapest low-carbon frame is the one designed and procured with carbon in the brief from day one.
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