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Comparison of moisture equilibrium of cement-based materials in presence of slag and silica fume in different wetting and drying cycles

Saeidpour, Mahsa LU and Wadsö, Lars LU (2014) 1st International Conference on Construction Materials and Structures p.813-818
Abstract
Water vapor sorption isotherms are essential data in models to predict the service life of the cement based structures. The knowledge about sorption isotherms in the presence of supplementary cementitous materials (SCMs) is limited. This study investigates the influence of water to cement ratio (0.4, 0.5 and 0.6), and the presence of two SCMs (70% slag and 10% silica fume) on sorption isotherm in hygroscopic and above hygroscope RH ranges for paste and mortars. Dynamic vapor balance in hygroscopic rang and pressure plates above hygroscopic range are used to generate sorption isotherms. Based on Jennings model (CM-II) for C-S-H structure, desorption isotherms are divided to different parts in which different pores are emptied. The samples... (More)
Water vapor sorption isotherms are essential data in models to predict the service life of the cement based structures. The knowledge about sorption isotherms in the presence of supplementary cementitous materials (SCMs) is limited. This study investigates the influence of water to cement ratio (0.4, 0.5 and 0.6), and the presence of two SCMs (70% slag and 10% silica fume) on sorption isotherm in hygroscopic and above hygroscope RH ranges for paste and mortars. Dynamic vapor balance in hygroscopic rang and pressure plates above hygroscopic range are used to generate sorption isotherms. Based on Jennings model (CM-II) for C-S-H structure, desorption isotherms are divided to different parts in which different pores are emptied. The samples with silica fume and slag have higher moisture content than OPC, but, with higher amount of gel pores and lower amount of capillary pores. At low RH intervals all samples have very similar desorption curves and introduction of SCMs induce slightly increase on BET surface area. Above 30% RH, samples have different desorption curves and the initial desorption is higher than following desorption for all samples. (Less)
Please use this url to cite or link to this publication:
author
and
organization
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
keywords
Water vapor sorption isotherms, supplementary cementitous materials
host publication
Proceedings of the First International Conference on Construction Materials and Structures
pages
813 - 818
publisher
IOS Press
conference name
1st International Conference on Construction Materials and Structures
conference location
Johannesburg, South Africa
conference dates
2014-11-24 - 2014-11-26
external identifiers
  • wos:000353898900105
ISBN
978-1-61499-466-4
978-1-61499-465-7
DOI
10.3233/978-1-61499-466-4-813
language
English
LU publication?
yes
id
f342798c-1b79-49eb-81e0-e2e50a9b1273 (old id 7432861)
date added to LUP
2016-04-04 12:08:17
date last changed
2018-11-21 21:09:13
@inproceedings{f342798c-1b79-49eb-81e0-e2e50a9b1273,
  abstract     = {Water vapor sorption isotherms are essential data in models to predict the service life of the cement based structures. The knowledge about sorption isotherms in the presence of supplementary cementitous materials (SCMs) is limited. This study investigates the influence of water to cement ratio (0.4, 0.5 and 0.6), and the presence of two SCMs (70% slag and 10% silica fume) on sorption isotherm in hygroscopic and above hygroscope RH ranges for paste and mortars. Dynamic vapor balance in hygroscopic rang and pressure plates above hygroscopic range are used to generate sorption isotherms. Based on Jennings model (CM-II) for C-S-H structure, desorption isotherms are divided to different parts in which different pores are emptied. The samples with silica fume and slag have higher moisture content than OPC, but, with higher amount of gel pores and lower amount of capillary pores. At low RH intervals all samples have very similar desorption curves and introduction of SCMs induce slightly increase on BET surface area. Above 30% RH, samples have different desorption curves and the initial desorption is higher than following desorption for all samples.},
  author       = {Saeidpour, Mahsa and Wadsö, Lars},
  booktitle    = {Proceedings of the First International Conference on Construction Materials and Structures},
  isbn         = {978-1-61499-466-4},
  language     = {eng},
  pages        = {813--818},
  publisher    = {IOS Press},
  title        = {Comparison of moisture equilibrium of cement-based materials in presence of slag and silica fume in different wetting and drying cycles},
  url          = {http://dx.doi.org/10.3233/978-1-61499-466-4-813},
  doi          = {10.3233/978-1-61499-466-4-813},
  year         = {2014},
}