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Nicia, D.; Jakob, C.; Jansen, D.; Ivanov, D.; Mazanec, O.; Neubauer, J.; Lowke, D.:
Thixotropy of superplasticized cement pastes – Underlying mechanisms considering the polycarboxylate molecular structure, interparticle interactions and hydration kinetics
This paper investigates the mechanisms driving thixotropic structural build-up in superplasticized cement suspensions, focusing on the PCE molecular structure. By analyzing the effects of side chain length and anionic charge ratio, the study reveals how these factors, along with early hydration kinetics, influence structural changes, particularly through ettringite formation.
Paper
Activation of LC3 binders by C-S-H nucleation seeding with a new tailored admixture for low-carbon cements
Limestone Calcined Clay Cements (LC3) offer up to a 40% reduction in CO2 emissions, with the LC3-50 formulation being the most studied. However, early-age mechanical strength is a challenge. This study explores the use of a new PCE-based superplasticizer and a C-S-H seeding accelerator, Master X-Seed STE53, to improve fluidity and early compressive strength in LC3-50 mortars. Results showed that the superplasticizer effectively prevented early fluidity loss, while the accelerator significantly enhanced compressive strength, particularly at 1 day, with improvements lasting up to 28 days.