Design and Preparation of Metakaolin-Based Mineral Admixture and its Effects on the Durability of Concrete

Shui, Zhong He; Yuan, Kai; Sun, Tao Lin; Li, Qiu; Zeng, Weineng

doi:10.1007/978-94-017-9939-3_28

Cited by 1 publication

(1 citation statement)

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“…Another point in relation to this is that both MCA and TA-MCA treatments result in nearly similar D50, but the combination treatments produce at least a minimum of 17% increase in specific surface areas in SC and a minimum of 98% increase in case of NC. Increase of surface areas is not necessarily resulted from finer particle sizes, as this can be possible from altered/fractured morphology instead, such as from creation of mesopores [48]. As a result, the PSD could still be similar while more specific surface areas become available for reaction in a morphologically altered sample.…”

Section: Discussionmentioning

confidence: 99%

Characterisation, Activation, and Reactivity of Heterogenous Natural Clays

Hazarika,

Huang,

Babaahmadi

2023

Preprint

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Although thermal and mechanochemical activations of natural clays are well-documented, there exists a dual research gap. Firstly, a thorough investigation into the interrelationship between these activation methods and the governing parameters of reactivity for various clays has been notably lacking. Secondly, there is a distinct scarcity of studies specifically focusing on heterogeneous clays compared to the extensive research dedicated to single-layer clays specially kaolinitic clays. This study investigates the correlation of activation methods, and changes in the clay mineralogy, particle size distributions, morphology, specific surface area, and the reactivity of heterogeneous clays. Traditional thermal and mechanochemical activation methods often fall short in achieving complete dehydroxylation of heterogeneous clay minerals and improving their reactivity beyond predefined low thresholds. The results in this paper emphasize that, despite these limitations, combining these activation methods brings about significant modifications in crucial parameters. Notably, integrating 20 minutes of mechanochemical activation at 500 rpm with prior thermal treatment leads to 158% increase in specific surface area compared to mechanochemical activation conducted on un-calcined clays. Simultaneously, these combined activations result in up to 127% improvement in reactivity levels of heterogenous clays compared to standalone mechanochemical activation. The results underscore that, even with the advancements brought about by combined activations, the presence of impurities like iron oxides and calcite remains a noteworthy factor influencing the reactivity of kaolinitic natural clays. The study concludes by highlighting the potential of combined treatments to enhance the pozzolanicity of low-reactive heterogeneous clays, unlocking avenues for future clinker supplementation with this abundant resource.

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Section: Discussionmentioning

confidence: 99%