Earth Friendly Concrete

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Earth Friendly Concrete (EFC) is traditional concrete that doesn’t use ordinary Portland cement (OPC). EFC uses a geopolymer binder system made from the chemical activation of two industrial waste byproducts – blast furnace slag and fly ash. This alternative binder can reduce the carbon emissions associated with OPC by up to 90%.

The engineering and construction properties of EFC are equal to and surpass OPC in some areas, e.g. greater durability, lower shrinkage, earlier strength gain, 30% higher flexural tensile strength and increased fire resistance.​

The contractor trialled EFC, with 170m3 used for thrust blocks, underpinning and back blinding of footings, all ground movement analysis works and all blinding of permanent works. The trial was successful and further options for the use of EFC are being explored on the project.

Typically, EFC provides a 64% CO2e reduction compared to traditional concrete (EFC = 50kg CO2e/m3 ​versus the original CEMI mix of 139.5kg CO2e/m3 ).

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About this entry

Published 8 March 2021
Views 3587

Categories
Carbon reduction,

Size of site
Large,

Level of Best Practice
Best practice,

About the author

Patrick Smith
Sustainability Manager

Entries by this author 12

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Mace
https://www.macegroup.com/

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