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    Volume 6, Issue 1

    Measuring Volume Change Caused by Calcium Oxychloride Phase Transformation in a Ca(OH)2-CaCl2-H2O System

    (Received 5 October 2016; accepted 5 January 2017)

    Published Online: 20 April 2017

    CODEN: ACEMF9

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    Abstract

    Calcium oxychloride has been reported to form in cementitious materials when calcium chloride (CaCl2) solutions react with calcium hydroxide [Ca(OH)2]. In this study, Ca(OH)2 is mixed with CaCl2 solutions with concentrations of 5 %, 10 %, 15 %, 20 %, 25 %, and 30 % by weight, using a 1:1 M ratio of Ca(OH)2 to CaCl2. The Ca(OH)2-CaCl2 solution mixtures are subject to a cooling and heating cycle. Volume change is measured to quantify the phase transformation associated with calcium oxychloride. Low-temperature differential scanning calorimetry (LT-DSC) is used to construct a phase isopleth, which is used to quantify the phase transformation associated with calcium oxychloride. Hysteresis is observed in the volume-change measurement during the cooling–heating cycle. In a temperature range of 50°C to 0°C, the formation of calcium oxychloride is complete for the 20 %, 25 %, and 30 % CaCl2 solutions. The liquidus temperatures at which calcium oxychloride is expected to form from LT-DSC during heating match those from the volume-change measurements.


    Author Information:

    Qiao, C.
    School of Civil and Construction Engineering, Oregon State Univ., Corvallis, OR

    Suraneni, P.
    School of Civil and Construction Engineering, Oregon State Univ., Corvallis, OR

    Weiss, J.
    School of Civil and Construction Engineering, Oregon State Univ., Corvallis, OR


    Stock #: ACEM20160065

    ISSN:2165-3984

    DOI: 10.1520/ACEM20160065

    Author
    Title Measuring Volume Change Caused by Calcium Oxychloride Phase Transformation in a Ca(OH)2-CaCl2-H2O System
    Symposium ,
    Committee C09