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Thursday, 17 October 2019
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Raw materials & technologies, Technologies

Valorisation of co-combustion fly ash in concrete production

Friday, 7 August 2015

The purpose of a paper is to compare the effects of two different Supplementary Cementing Materials (SCMs) on mechanical and durability-related properties of structural concrete.

Researchers have compare the effects of cementing materials on the properties of structural concrete. Source: Marlis Dülsen/pixelio.de

Researchers have compare the effects of cementing materials on the properties of structural concrete. Source: Marlis Dülsen/pixelio.de

Three mixes were produced, where coal and co-combustion fly ashes were used as partial substitute of cement (20% in volume) and compared with a control/reference concrete. Performances investigated included fresh concrete properties, compressive and tensile strength, elastic modulus, permeability, capillarity and drying/wetting resistance.

Workability improves

Results indicate that both the SCMs can be classified as low-carbon fly ashes, and their use in concrete improves the workability of the mixes. A slight reduction of mechanical strength was observed for the concretes including both the SCMs. In addition, concrete transport properties were also slightly reduced when co-combustion fly ash was used. Wetting-drying cycles affected significantly the durability of all the mixes: compressive strength after these cycles was significantly lowered, and the cracks occurred due to the thermal stress applied, appeared to be filled by needle-shape crystals of ettringite.

The study is published in: Materials & Design, Volume 85, 15 November 2015, Pages 687-694.

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