Reactivity and Performance of Limestone Calcined-Clay Cements (LC3) Cured at Low Temperature

Author(s): Franco Zunino and Karen Scrivener
Paper category: Proceedings
Book title: Proceedings of International Conferences (ICACMS) Advances in Construction Materials and systems Vol 2
Editor(s): Manu Santhanam, Ravindra Gettu, Radhakrishna G. Pillai, Sunitha K. Nayar
ISBN: 978-2-35158-194-0
e-ISBN: 978-2-35158-191-9
Publisher: RILEM Publications SARL
Publication year: 2017
Pages: 180-186
Total Pages: 7
Language : English

Abstract: Limestone calcined-clay cements (LC3) take advantage of the synergetic effects of calcium carbonate reaction with the additional alumina provided by the calcined clay. As temperature decreases, calcium carbonate solubility increases, therefore, the early-age hydration kinetics are modified. This study explored the reactivity and mechanical performance of different LC3 systems cured at 10 and 20°C. Mixtures containing PC, PC-limestone and LC3
blends with 50 or 65 % clinker factors and 0.5:1, 1:1 and 2:1 clay-to-limestone ratio were cast and compared. The hydration kinetics were assessed using isothermal calorimetry at each temperature. Compressive strength was monitored over time on cement paste samples. The phase assemblage was monitored using XRD. Results showed that LC3 systems are more resilient to
low temperature curing conditions than traditional PC systems with enhanced early-age performance due to modifications of the phase assemblage. The increased solubility of limestone allows the same performance to be obtained at lower clay-to-limestone ratios.

Online publication : 2017
Publication type : full_text
Public price (Euros) : 0.00