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Thursday, 27 February 2020
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Raw materials & technologies, Applications

Influence of filler effect on the sulfate requirement of blended cements

Friday, 6 December 2019

A recently published study investigates the mechanism behind the impact of two SCMs on the sulfate balance of blended cements.

In some blended cements, the optimum amount of sulfate addition differs from that observed in OPC. Source: Thomas Söllner – stock.adobe.com.

In some blended cements, the optimum amount of sulfate addition differs from that observed in OPC. Source: Thomas Söllner – stock.adobe.com.

The study aims to understand the mechanism behind the impact of two SCMs, namely metakaolin and limestone, on the sulfate balance of blended cements. No significant impact of the aluminum content of these SCMs was observed. Instead, it is observed that the filler effect of the SCM, which accelerates the reaction of alite, is the main factor impacting the sulfate balance.

Relationship between heat release and gypsum content

As the rate of precipitation of C-S-H is increased, more sulfate is adsorbed by the C-S-H and consequently, the depletion of gypsum is reached earlier in time during the hydration process. A relationship between heat release at the onset of the aluminate peak and the gypsum content of the system was established.

The study is published in: Cement and Concrete Research, Volume 126, December 2019, 105918.

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