Experimental study on pore connectivity and its influence on chloride transport in saturated cementitious system

Conference paper (2016)

Authors

Y. Zhang Materials and Environment - CEG
G. Ye Materials and Environment - CEG
Research Group
Materials and Environment (CEG) (TU Delft)
Copyright: © 2016 Y. Zhang, G. Ye
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Published Date

2016

Language

English

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Faculty

Civil Engineering & Geosciences

Department

Materials- Mechanics- Management & Design

Research Group

Materials and Environment

Abstract

The purpose of this paper is to investigate the pore connectivity and its influence on chloride transport property in cementitious materials under saturated condition. Mercury intrusion porosimetry experiment was carried out on a variety of hydrated cement pastes curing up to one year. By repeating pressurization-depressurization cycles, pore entrapment (namely ink-bottled effect) was expressed as a function of the equivalent diameter of penetrated throat neck pores. Accordingly, the small capillary pores that are present within patches of hydration products and the large capillary pores that are left out of hydration products were distinguished and their connections were ascertained, which provide evident basis for the study of transport property estimated by means of rapid chloride migration test on mortar samples. The results suggested that in hydrated cementitious system the capillary pore connections influencing mass transport should be mainly attributed to the connectivity of small capillary pores, whose relevance to chloride migration coefficient has also been testified by the well-fitted experimental plots in this study.

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