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 language | English (US) |
|---|---|
| Pages (from-to) | 157-169 |
| Number of pages | 13 |
| Journal | Advances in Civil Engineering Materials |
| Volume | 6 |
| Issue number | 1 |
| DOIs | |
| State | Published - Jan 1 2017 |
| Externally published | Yes |
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