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

Mahsa Saeidpour, Lars Wadsö

Research output: Chapter in Book/Report/Conference proceedingPaper in conference proceedingpeer-review

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.
Original languageEnglish
Title of host publicationProceedings of the First International Conference on Construction Materials and Structures
PublisherIOS Press
Pages813-818
ISBN (Print)978-1-61499-466-4, 978-1-61499-465-7
DOIs
Publication statusPublished - 2014
Event1st International Conference on Construction Materials and Structures - Johannesburg, South Africa
Duration: 2014 Nov 242014 Nov 26

Conference

Conference1st International Conference on Construction Materials and Structures
Country/TerritorySouth Africa
CityJohannesburg
Period2014/11/242014/11/26

Subject classification (UKÄ)

  • Construction Management

Keywords

  • Water vapor sorption isotherms
  • supplementary cementitous materials

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