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Title: Natural and accelerated CO{sub 2} binding kinetics in cement paste at different relative humidities

Natural carbonation and accelerated carbonation are compared in terms of CO{sub 2} combination. Thermogravimetrical analysis, neutron diffraction and weight measurements were used to quantify the amounts of CO{sub 2} in samples exposed to different CO{sub 2} and relative humidity (RH) conditions. An exponential equation is proposed to describe temporal evolution: combination rates and maximum values are obtained both for natural and accelerated processes. The influence of RH in these parameters is analyzed. At 100% CO{sub 2} an increase of RH from 53 to 75% diminishes the combination rate considerably, but increases slightly the maximum CO{sub 2} binding. At 0.5% CO{sub 2} both the rate and the maximum are higher for intermediate RH, with a linear relation between both variables. Equivalences between the different processes have been calculated: the amount of CO{sub 2} combined in 1 h at 100% CO{sub 2} and 65% RH carbonation is equivalent to approximately 36 days of natural exposure outside and 54 days inside.
Authors:
 [1] ; ;  [2]
  1. University of Aberdeen, Department of Chemistry, Meston Walk, AB24 3UE (United Kingdom)
  2. Eduardo Torroja Institute CSIC, Serrano Galvache 4, 28033 Madrid (Spain)
Publication Date:
OSTI Identifier:
22220800
Resource Type:
Journal Article
Resource Relation:
Journal Name: Cement and Concrete Research; Journal Volume: 49; Other Information: Copyright (c) 2013 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; 36 MATERIALS SCIENCE; CARBON DIOXIDE; CARBONATES; CEMENTS; HUMIDITY; NEUTRON DIFFRACTION; THERMAL ANALYSIS