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Title: Effect of temperature on the microstructure of calcium silicate hydrate (C-S-H)

Abstract

Temperature affects the properties of concrete through its effect on the hydration of cement and its associated microstructural development. This paper focuses on the modifications to C-S-H induced by isothermal curing between 5 and 60 °C. The results show that as the temperature increases (within the range studied) the C/S ratio of C-S-H changes only slightly, with a higher degree of polymerisation of silicate chains, but there is a significant decrease in its bound water content and an increase of apparent density of 25%. This increase seems to come from a different packing of C-S-H at the nanoscale. As a consequence of these changes, the microstructure of the cement paste is much coarser and porous, which explains the lower final strengths obtained by curing at elevated temperatures. -- Highlights: •C-S-H structure studied at the atomic level •Multiple analytical techniques used •Studies conducted at temperatures above and below normal temperatures.

Authors:
;
Publication Date:
OSTI Identifier:
22220821
Resource Type:
Journal Article
Journal Name:
Cement and Concrete Research
Additional Journal Information:
Journal Volume: 53; Other Information: Copyright (c) 2013 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0008-8846
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 77 NANOSCIENCE AND NANOTECHNOLOGY; CALCIUM SILICATES; CEMENTS; CONCRETES; DENSITY; HYDRATES; HYDRATION; MICROSTRUCTURE; NANOSTRUCTURES; POLYMERIZATION; SCANNING ELECTRON MICROSCOPY

Citation Formats

Gallucci, E., E-mail: gallucci.emmanuel@ch.sika.com, Zhang, X., and Scrivener, K. L. Effect of temperature on the microstructure of calcium silicate hydrate (C-S-H). United States: N. p., 2013. Web. doi:10.1016/J.CEMCONRES.2013.06.008.
Gallucci, E., E-mail: gallucci.emmanuel@ch.sika.com, Zhang, X., & Scrivener, K. L. Effect of temperature on the microstructure of calcium silicate hydrate (C-S-H). United States. https://doi.org/10.1016/J.CEMCONRES.2013.06.008
Gallucci, E., E-mail: gallucci.emmanuel@ch.sika.com, Zhang, X., and Scrivener, K. L. 2013. "Effect of temperature on the microstructure of calcium silicate hydrate (C-S-H)". United States. https://doi.org/10.1016/J.CEMCONRES.2013.06.008.
@article{osti_22220821,
title = {Effect of temperature on the microstructure of calcium silicate hydrate (C-S-H)},
author = {Gallucci, E., E-mail: gallucci.emmanuel@ch.sika.com and Zhang, X. and Scrivener, K. L.},
abstractNote = {Temperature affects the properties of concrete through its effect on the hydration of cement and its associated microstructural development. This paper focuses on the modifications to C-S-H induced by isothermal curing between 5 and 60 °C. The results show that as the temperature increases (within the range studied) the C/S ratio of C-S-H changes only slightly, with a higher degree of polymerisation of silicate chains, but there is a significant decrease in its bound water content and an increase of apparent density of 25%. This increase seems to come from a different packing of C-S-H at the nanoscale. As a consequence of these changes, the microstructure of the cement paste is much coarser and porous, which explains the lower final strengths obtained by curing at elevated temperatures. -- Highlights: •C-S-H structure studied at the atomic level •Multiple analytical techniques used •Studies conducted at temperatures above and below normal temperatures.},
doi = {10.1016/J.CEMCONRES.2013.06.008},
url = {https://www.osti.gov/biblio/22220821}, journal = {Cement and Concrete Research},
issn = {0008-8846},
number = ,
volume = 53,
place = {United States},
year = {Fri Nov 15 00:00:00 EST 2013},
month = {Fri Nov 15 00:00:00 EST 2013}
}