Slurry Consistency and In Situ Synchrotron X-Ray Diffraction During the Early Hydration of Portland Cements With Calcium Chloride |
| |
| Authors: | Andrew C Jupe Angus P Wilkinson Karen Luke Gary P Funkhouser |
| |
| Affiliation: | School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, Georgia 30332-0400; Trican Well Services Ltd., R&D Centre, Calgary, Alberta, Canada T2Z 4M3; Halliburton, Duncan Technology Center, Duncan, Oklahoma 73536-0470 |
| |
| Abstract: | Class A and H oil well cements are compared at 25° and 50°C with 0%, 1%, 2%, and 4% CaCl2. Up to 4% CaCl2 accelerated Class A thickening, but 4% led to slower thickening than 2% for Class H. C3S hydration in the two cements responded differently to CaCl2. CaCl2 always accelerated aluminate hydration. For Class A, CaCl2 accelerated early Ca(OH)2 precipitation, but sometimes reduced the amount at longer times. This may be coupled to C–S–H gel composition changes. For Class H, Ca(OH)2 precipitation changes nonlinearly with CaCl2 concentration. Ettringite to monosulfate conversion and Friedel's salt formation were sometimes seen. |
| |
| Keywords: | |
|
|
