Measuring volume change caused by calcium oxychloride phase transformation in a Ca(OH)2-CaCl2-H2O system

C. Qiao, Prannoy Suraneni, J. Weiss

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

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.

Original languageEnglish (US)
Pages (from-to)157-169
Number of pages13
JournalAdvances in Civil Engineering Materials
Volume6
Issue number1
DOIs
StatePublished - Jan 1 2017
Externally publishedYes

Keywords

  • Calcium chloride
  • Calcium oxychloride
  • Differential scanning calorimetry
  • Phase diagram
  • Volume change

ASJC Scopus subject areas

  • Ceramics and Composites
  • Civil and Structural Engineering
  • Mechanics of Materials
  • Polymers and Plastics
  • Metals and Alloys
  • Materials Chemistry

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