Chloride Binding Capacity of Mortars Made with Various Portland Cements and Mineral Admixtures

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  • Ishida Tetsuya
    Department of Civil Engineering, University of Tokyo, Japan.
  • Miyahara Shigeyoshi
    Civil Engineering Laboratory, Taisei Technology Center, Taisei Corporation, Japan.
  • Maruya Tsuyoshi
    Civil Engineering Laboratory, Taisei Technology Center, Taisei Corporation, Japan.

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The authors experimentally studied the chloride binding capacity of mortar specimens made with various combinations of Portland cement, blast furnace slag, and pozzolans. In the experiment, a pore liquid extraction method, chloride titration test, a quantitative analysis of Friedel's salt based on the XRD method, and a mercury intrusion porosimetry test were conducted in order to measure chloride ions, adsorbed chlorides on the pore wall, and solid-phase chlorides (Friedel's salt), separately. It was clearly shown that the amount of Friedel's salt strongly depends on the type of binder used, whereas adsorbed chlorides is controlled by the micropore structure and the characteristics of the hydrated products.

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