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Promising Early Age Evaluations of Fly Ash - Calcined Marl - OPC Ternary Cement
Abstract The search for new supplementary cementing materials (SCM) creates opportunities to using new materials such as calcined clays and marl. However, such changes require a transition period, where introduction of new SCMs are most successful when they can be coupled and employed with the existing materials. For this purpose, a series of ternary mixes employing fly ash (F), calcined marl (C) and ordinary Portland cement (OPC) was evaluated against mono- and binary mixes of the components. It was found that due to the complementary water demand of fly ash and calcined marl, forming pastes made of ternary blends of FC-OPC leads to better rheology than pure OPC pastes, particularly when a F:C ratio of 1:1 was present, even up to 60% replacement of OPC. Any increase in C results in a decrease in flowability, while increasing the F proportion resulted in higher flow, with eventual bleeding. This was coupled with a synergetic improvement in the early age of hydration of the ternary mixes as compared to mono- or binary mixes. The results here indicate that ternary mix of fly ash-calcined marl-OPC can pave the way for future cementing systems, where it can be easily utilized even in the transition stage and allow the successful implementation of this material.
Promising Early Age Evaluations of Fly Ash - Calcined Marl - OPC Ternary Cement
Abstract The search for new supplementary cementing materials (SCM) creates opportunities to using new materials such as calcined clays and marl. However, such changes require a transition period, where introduction of new SCMs are most successful when they can be coupled and employed with the existing materials. For this purpose, a series of ternary mixes employing fly ash (F), calcined marl (C) and ordinary Portland cement (OPC) was evaluated against mono- and binary mixes of the components. It was found that due to the complementary water demand of fly ash and calcined marl, forming pastes made of ternary blends of FC-OPC leads to better rheology than pure OPC pastes, particularly when a F:C ratio of 1:1 was present, even up to 60% replacement of OPC. Any increase in C results in a decrease in flowability, while increasing the F proportion resulted in higher flow, with eventual bleeding. This was coupled with a synergetic improvement in the early age of hydration of the ternary mixes as compared to mono- or binary mixes. The results here indicate that ternary mix of fly ash-calcined marl-OPC can pave the way for future cementing systems, where it can be easily utilized even in the transition stage and allow the successful implementation of this material.
Promising Early Age Evaluations of Fly Ash - Calcined Marl - OPC Ternary Cement
Ng, Serina (author) / Østnor, Tone (author)
2017-10-28
5 pages
Article/Chapter (Book)
Electronic Resource
English
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