RT Journal Article
T1 Enhancing fluidity and mechanical properties in Limestone Calcined Clay cements with one-third Portland clinker content
A1 Morales-Cantero, Alejandro
A1 Vallina, Diego
A1 Gómez-de-la-Torre, María de los  Ángeles
A1 Cuesta, Ana
A1 Santacruz-Cruz, María Isabel
A1 Dalla-Libera, Alessandro
A1 Borralleras, Pere
A1 Dhers, Sebastien
A1 Schwesig, Peter
A1 Mazanec, Oliver
A1 García-Aranda, Miguel Ángel
K1 Cemento Portland
K1 Cemento
AB Limestone Calcined Clay Cements (LC3) are attracting considerable attention due to their low CO2 footprints and relatively fast hydration kinetics. LC3-50 formulations (approximately 50% Portland clinker, 30% kaolinitic calcined clay, 15% limestone and 5% gypsum) are being extensively investigated and the hydration chemistry, rheology, mechanical strength developments and durability performances are starting to be well established. LC3 binders with lower clinker factors are possible, offering an opportunity for further CO2 footprint reduction. However, these blends have been much less studied. This work contributes to fill this gap. Here, a LC3-35 binder (i.e. 35% Portland clinker content) is investigated and its performances are compared to those of the original Portland cement (PC) and a standard LC3-50 binder. The effects of two superplasticizers and a strength-enhancing admixture are thoroughly investigated in mortars and pastes. Larger calcined clay contents result in an exacerbation of the slump retention problem, but this issue is solved by the use of a new superplasticizer. Moreover, the low mechanical strengths at early ages can be partly mitigated with a C-S-H nucleation seeding admixture. Employing the right admixtures, LC3-35 binders can develop strength values similar to those of neat PC and LC3-50 at 7 and 28 days. The laboratory X-ray powder diffraction results for LC3-35 pastes, when using the strength-enhancing admixture, show that C4AF exhibits an accelerated reaction rate, leading to the formation of larger amounts of AFt and AFm. Approximate mass balance calculations are carried out to estimate the metakaolin reaction degree and an environmental performance indicator is used to place the footprints of the reported binders within the LC3 landscape.
PB Elsevier
YR 2024
FD 2024
LK https://hdl.handle.net/10630/36334
UL https://hdl.handle.net/10630/36334
LA eng
NO Alejandro Morales-Cantero, Diego Vallina, Angeles G. De la Torre, Ana Cuesta, Isabel Santacruz, Alessandro Dalla-Libera, Pere Borralleras, Sébastien Dhers, Peter Schwesig, Oliver Mazanec, Maiguel A.G. Aranda, Enhancing fluidity and mechanical properties in Limestone Calcined Clay cements with one-third Portland clinker content, Journal of Building Engineering, Volume 95, 2024, 110334, ISSN 2352-7102, https://doi.org/10.1016/j.jobe.2024.110334. (https://www.sciencedirect.com/science/article/pii/S2352710224019028)
NO This research was partly supported by the research grant PID2020-114650RB-I00 which is co-funded by ERDF. We thank the Escuela de Ingenierías Industriales, Universidad of Málaga, where the mechanical strength tests were performed.
DS RIUMA. Repositorio Institucional de la Universidad de Málaga
RD 21 ene 2026