Accelerated growth of calcium silicate hydrates: Experiments and simulations

Journal Article · Thu Dec 15 00:00:00 EST 2011 · Cement and Concrete Research

DOI:https://doi.org/10.1016/j.cemconres.2011.04.012· OSTI ID:21576909

Nicoleau, Luc

Despite the usefulness of isothermal calorimetry in cement analytics, without any further computations this brings only little information on the nucleation and growth of hydrates. A model originally developed by Garrault et al. is used in this study in order to simulate hydration curves of cement obtained by calorimetry with different known hardening accelerators. The limited basis set of parameters used in this model, having a physical or chemical significance, is valuable for a better understanding of mechanisms underlying in the acceleration of C-S-H precipitation. Alite hydration in presence of four different types of hardening accelerators was investigated. It is evidenced that each accelerator type plays a specific role on one or several growth parameters and that the model may support the development of new accelerators. Those simulations supported by experimental observations enable us to follow the formation of the C-S-H layer around grains and to extract interesting information on its apparent permeability.

• OSTI ID: 21576909
• Journal Information: Cement and Concrete Research, Vol. 41, Issue 12; Conference: International summit on cement hydration kinetics and modeling;CONMOD10: Symposium on concrete modelling, Quebec City, PB (Canada);Lausanne (Switzerland), 27-29 Jul 2009;22-25 Jun 2010; Other Information: DOI: 10.1016/j.cemconres.2011.04.012; PII: S0008-8846(11)00123-2; Copyright (c) 2011 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; ISSN 0008-8846
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ACCELERATION
ACCELERATORS
CALCIUM SILICATES
CALORIMETRY
CEMENTS
HARDENING
HYDRATES
HYDRATION
LAYERS
NUCLEATION
PRECIPITATION
SCANNING ELECTRON MICROSCOPY
SIMULATION
ALKALINE EARTH METAL COMPOUNDS
BUILDING MATERIALS
CALCIUM COMPOUNDS
ELECTRON MICROSCOPY
MATERIALS
MICROSCOPY
OXYGEN COMPOUNDS
SEPARATION PROCESSES
SILICATES
SILICON COMPOUNDS
SOLVATION