Print Email Facebook Twitter On the chemo-mechanical evolution process of high-volume slag cement paste Title On the chemo-mechanical evolution process of high-volume slag cement paste Author Liang, M. (TU Delft Materials and Environment) Zhang, Y. (TU Delft Materials and Environment) He, S. (TU Delft Materials and Environment) Chen, Y. (TU Delft Materials and Environment) Schlangen, E. (TU Delft Materials and Environment) Šavija, B. (TU Delft Materials and Environment) Date 2023 Abstract This study investigated the evolution process of high-volume slag cement (HVSC) paste from a chemo-mechanical standpoint. HVSC specimens with a 70 w.t. % slag replacement rate were studied at various ages. Evolution of phase assemblage, microstructure development, and micromechanical properties were analyzed using TGA/XRD/MIP/SEM-EDS and nano-/micro-indentation techniques. A two-scale micromechanical model was built to predict the effective elastic modulus based on the nanoindentation results. Key findings include: 1) Between 7 and 28 days, the formation of calcium silicate hydrate (C-S-H) gel phase improves the effective elastic modulus by filling capillary pores; 2) From 28 to 90 days, the phase assemblage and microstructure remain stable, with a transition from low-density to high-density C-S-H; 3) Between 90 days and 2 years, slag rims produced by slag grains result in increased elastic modulus; 4) The two-scale micromechanical model, combined with nanoindentation data, accurately predicts the effective modulus of HVSC composites, although the unhydrated slag grains-hydrated cement matrix interface may cause an overestimation at an early age. With longer curing time, this interface disappears owing to the continuous hydration of large slag particles and therefore a good match is found between the modelling and experimental results. Subject Chemo-mechanical propertiesEvolutionHigh volume slag replacementLow-carbon cement To reference this document use: http://resolver.tudelft.nl/uuid:b67f7842-5981-4b9e-b995-26b5722ef492 DOI https://doi.org/10.1016/j.conbuildmat.2023.132891 ISSN 0950-0618 Source Construction and Building Materials, 400 Part of collection Institutional Repository Document type journal article Rights © 2023 M. Liang, Y. Zhang, S. He, Y. Chen, E. Schlangen, B. Šavija Files PDF 1_s2.0_S0950061823026077_main.pdf 5.18 MB Close viewer /islandora/object/uuid:b67f7842-5981-4b9e-b995-26b5722ef492/datastream/OBJ/view