What Is Low Carbon Concrete

Because conventional concrete generates so much CO2, low-carbon concrete has garnered a lot of interest. It has been shown that cement contributes the most to CO2 emissions from concrete, accounting for 75% of all emissions, with aggregate coming in second with less than 20%. The largest source of CO2 emissions from aggregate is power, with smaller amounts coming from excavation, hauling, blasting, and transportation.

Concrete that has a reduced carbon footprint than standard concrete is known as low carbon concrete. Low-carbon concrete should behave exactly like its high-carbon version, with the exception of a smaller carbon footprint.

Producers can make a number of relatively low-impact adjustments to their manufacturing procedures and mix designs to generate-carbon concrete. For instance, changing the fuel source, substituting some of the cement's mineral ingredients with calcined clays, fly ash, or blast-furnace slag, or adopting cutting-edge technology like CarbonCure's line of products.

The Global Cement and Concrete Association published a Climate Ambition promise in September 2020 that aims to achieve carbon neutrality for the entire industry by 2050, not only for low-carbon concrete. Numerous cement and concrete industries have already committed to this and the Science Based Targets programme has third-party verified their strategies.

Demand for Low Carbon Concrete is Growing

Over 4,500 construction projects have requested Environmental Product Declarations (EPDs) in the past year, according to a review of databases for construction projects (Dodge database search in May 2022).

This exemplifies the growing market desire for greater openness about the carbon impact of building materials.

The pressure to demonstrate that they are keeping sustainability commitments to end clients and to professional initiatives and organisations like Architecture 2030, Structural Engineers 2050 Challenge, the Carbon Leadership Forum, and the World Green Building Council is mounting for architects, engineers, contractors, and project owners.

Methods for Making Low Carbon Concrete

Low carbon concrete production does not have a magic solution. There are many ways to lessen the carbon footprint of the many parts and processes that go into making concrete because it contains so many different elements.

Low-carbon fuels, low-carbon mixed cement, and carbon capture, utilisation, and storage technologies are the main areas of concentration for innovation in carbon reduction and removal.

Low carbon concrete benefits

• up to a 75% reduction in carbon emissions when compared to conventional products increased early power.
• enhanced toughness as a result of the growth of nano-CaCO3 crystals.
• Low embodied energy and cement content.
• CO2 can be used in place of steam.