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Title: Why alite stops hydrating below 80% relative humidity

Abstract

It has been observed that the hydration of cement paste stops when the relative humidity drops below about 80%. A thermodynamic analysis shows that the capillary pressure exerted at that RH shifts the solubility of tricalcium silicate, so that it is in equilibrium with water. This is a reflection of the chemical shrinkage in this system: according to Le Chatelier's principle, since the volume of the products is less than that of the reactants, a negative (capillary) pressure opposes the reaction.

Authors:
 [1];  [2];  [3]
  1. Sika Technology AG, Zuerich (Switzerland)
  2. Princeton University, Eng. Quad. E-319, Princeton NJ 08544 (United States)
  3. National Institute of Standards and Technology, Gaithersburg MD (United States)
Publication Date:
OSTI Identifier:
21576916
Resource Type:
Journal Article
Journal Name:
Cement and Concrete Research
Additional Journal Information:
Journal Volume: 41; Journal Issue: 9; Other Information: DOI: 10.1016/j.cemconres.2011.06.001; PII: S0008-8846(11)00162-1; Copyright (c) 2011 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Journal ID: ISSN 0008-8846
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; 36 MATERIALS SCIENCE; CALCIUM SILICATES; CAPILLARIES; CEMENTS; EQUILIBRIUM; HUMIDITY; HYDRATION; REFLECTION; SHRINKAGE; SOLUBILITY; WATER; ALKALINE EARTH METAL COMPOUNDS; BLOOD VESSELS; BODY; BUILDING MATERIALS; CALCIUM COMPOUNDS; CARDIOVASCULAR SYSTEM; HYDROGEN COMPOUNDS; MATERIALS; MOISTURE; ORGANS; OXYGEN COMPOUNDS; SILICATES; SILICON COMPOUNDS; SOLVATION

Citation Formats

Flatt, Robert J., Scherer, George W., E-mail: scherer@princeton.edu, and Bullard, Jeffrey W. Why alite stops hydrating below 80% relative humidity. United States: N. p., 2011. Web. doi:10.1016/j.cemconres.2011.06.001.
Flatt, Robert J., Scherer, George W., E-mail: scherer@princeton.edu, & Bullard, Jeffrey W. Why alite stops hydrating below 80% relative humidity. United States. doi:10.1016/j.cemconres.2011.06.001.
Flatt, Robert J., Scherer, George W., E-mail: scherer@princeton.edu, and Bullard, Jeffrey W. Thu . "Why alite stops hydrating below 80% relative humidity". United States. doi:10.1016/j.cemconres.2011.06.001.
@article{osti_21576916,
title = {Why alite stops hydrating below 80% relative humidity},
author = {Flatt, Robert J. and Scherer, George W., E-mail: scherer@princeton.edu and Bullard, Jeffrey W.},
abstractNote = {It has been observed that the hydration of cement paste stops when the relative humidity drops below about 80%. A thermodynamic analysis shows that the capillary pressure exerted at that RH shifts the solubility of tricalcium silicate, so that it is in equilibrium with water. This is a reflection of the chemical shrinkage in this system: according to Le Chatelier's principle, since the volume of the products is less than that of the reactants, a negative (capillary) pressure opposes the reaction.},
doi = {10.1016/j.cemconres.2011.06.001},
journal = {Cement and Concrete Research},
issn = {0008-8846},
number = 9,
volume = 41,
place = {United States},
year = {2011},
month = {9}
}