Hydration and phase assemblage of limestone calcined clay cements (LC3) with clinker content below 50

Limestone calcined clay cement (LC3) is a promising material for producing cement with low CO2 emissions and properties similar to, or superior to, those of Portland cement (PC), but at 50 % clinker content (LC3-50). In many applications, lower strengths than PC are acceptable, opening new opportuni...

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Bibliographic Details
Published inCement and concrete research Vol. 177; p. 107417
Main Authors Sun, Jinfeng, Zunino, Franco, Scrivener, Karen
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 01.03.2024
Subjects
Blended cement
Ca(OH)2
Calorimetry
Compressive strength
Hydration
Calorimetry
Compressive strength
Hydration
Ca(OH)2
Blended cement
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Summary:Limestone calcined clay cement (LC3) is a promising material for producing cement with low CO2 emissions and properties similar to, or superior to, those of Portland cement (PC), but at 50 % clinker content (LC3-50). In many applications, lower strengths than PC are acceptable, opening new opportunities to develop suitable LC3 formulations with clinker contents below 50 %. In this study, we investigate the microstructural development of low-clinker LC3 and the effect of portlandite (CH) addition on the reaction of metakaolin (MK). In low-clinker systems, the MK reaction is limited by the availability of CH. The addition of CH to the blends effectively enhanced the reaction of metakaolin and promoted the formation of carboaluminates, which significantly improved the compressive strength from 7 to 90 d. Environmental performance indicators showed that all investigated low-clinker LC3 systems had lower embodied CO2 compared to PC while achieving adequate mechanical properties.
ISSN:0008-8846
1873-3948
DOI:10.1016/j.cemconres.2023.107417