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Wednesday, 17 July 2019
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Raw materials & technologies, Technologies

Investigating concrete mixes with low-energy demanding binders

Wednesday, 11 November 2015

A series of tests was performed to investigate salient mechanical properties of concrete in which Portland Cement (PC) was replaced by different combinations of low energy-demanding materials.

Researchers aimed at replacing Portland Cement by low energy-demanding materials. Source: Bernd Wachtmeister/pixelio.de

Researchers aimed at replacing Portland Cement by low energy-demanding materials. Source: Bernd Wachtmeister/pixelio.de

The potential use of the latter material in structural concrete has not been established and further research is needed prior to industrial scale applications. Tests investigated the setting times and soundness of the resulting cement, as well as the workability, cube compressive strength at various curing times, tensile splitting strength, flexural strength and water absorption of the resulting concrete.

Good potential for replacing high proportions of PC

The results showed that mixes combining the low energy-demanding materials at the right proportions i.e. Metakaolin (MK) up to a maximum of 20%, Pulverised Fuel Ash (PFA) up to 20% and 5–10% reactive magnesia (MgO), show good potential for replacing high proportions of PC (up to 50%), giving good quality concrete in terms of strength and durability, with improved environmental impact.

The study is published in: Construction and Building Materials, Volume 101, Part 1, 30 December 2015, Pages 1122–1141

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