Long-term creep deformations in colloidal calcium-silicate-hydrate gels by accelerated aging simulations.

Accelerated dynamics Calcium–silicate–hydrate Colloidal gel Creep

Journal

Journal of colloid and interface science
ISSN: 1095-7103
Titre abrégé: J Colloid Interface Sci
Pays: United States
ID NLM: 0043125

Informations de publication

Date de publication:
15 Apr 2019
Historique:
received: 16 10 2018
revised: 24 12 2018
accepted: 06 02 2019
pubmed: 16 2 2019
medline: 16 2 2019
entrez: 16 2 2019
Statut: ppublish

Résumé

When subjected to a sustained load, jammed colloidal gels can feature some delayed viscoplastic creep deformations. However, due to the long timescale of creep (up to several years), its modeling and, thereby, prediction has remained challenging. Here, based on mesoscale simulations of calcium-silicate-hydrate gels (CSH, the binding phase of concrete), we present an accelerated simulation method-based on stress perturbations and overaging-to model creep deformations in CSH. Our simulations yield a very good agreement with nanoindentation creep tests, which suggests that concrete creep occurs through the reorganization of CSH grains at the mesoscale. We show that the creep of CSH exhibits a logarithmic dependence on time-in agreement with the free-volume theory of granular physics. Further, we demonstrate the existence of a linear regime, i.e., wherein creep linearly depends on the applied load-which establishes the creep modulus as a material constant. These results could offer a new physics-based basis for nanoengineering colloidal gels featuring minimal creep.

Identifiants

DOI: 10.1016/j.jcis.2019.02.022 PMID: 30769256
pubmed: 30769256
pii: S0021-9797(19)30187-0
doi: 10.1016/j.jcis.2019.02.022
pii:
doi:

Types de publication

Journal Article

Langues

eng

Pagination

339-346

Informations de copyright

Copyright © 2019 Elsevier Inc. All rights reserved.

Auteurs

Han Liu (H)

Physics of AmoRphous and Inorganic Solids Laboratory (PARISlab), Department of Civil and Environmental Engineering, University of California, Los Angeles, CA 90095, USA.

Shiqi Dong (S)

Physics of AmoRphous and Inorganic Solids Laboratory (PARISlab), Department of Civil and Environmental Engineering, University of California, Los Angeles, CA 90095, USA; Laboratory for the Chemistry of Construction Materials (LC(2)), Department of Civil and Environmental Engineering, University of California, Los Angeles, CA 90095, USA.

Longwen Tang (L)

Physics of AmoRphous and Inorganic Solids Laboratory (PARISlab), Department of Civil and Environmental Engineering, University of California, Los Angeles, CA 90095, USA; State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan 430072, China.

N M Anoop Krishnan (NM)

Physics of AmoRphous and Inorganic Solids Laboratory (PARISlab), Department of Civil and Environmental Engineering, University of California, Los Angeles, CA 90095, USA; Department of Civil Engineering, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110016, India.

Enrico Masoero (E)

School of Engineering, Newcastle University, Newcastle Upon Tyne NE1 7RU, UK.

Gaurav Sant (G)

Laboratory for the Chemistry of Construction Materials (LC(2)), Department of Civil and Environmental Engineering, University of California, Los Angeles, CA 90095, USA; California Nanosystems Institute (CNSI), University of California, Los Angeles, CA 90095, USA.

Mathieu Bauchy (M)

Physics of AmoRphous and Inorganic Solids Laboratory (PARISlab), Department of Civil and Environmental Engineering, University of California, Los Angeles, CA 90095, USA. Electronic address: bauchy@ucla.edu.

Classifications MeSH