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Slurry Consistency and In Situ Synchrotron X‐Ray Diffraction During the Early Hydration of Portland Cements With Calcium Chloride
Author(s) -
Jupe Andrew C.,
Wilkinson Angus P.,
Luke Karen,
Funkhouser Gary P.
Publication year - 2007
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2007.01806.x
Subject(s) - ettringite , precipitation , aluminate , calcium hydroxide , portland cement , mineralogy , chemistry , cement , salt (chemistry) , slurry , portlandite , calcium , chloride , nuclear chemistry , materials science , metallurgy , composite material , organic chemistry , meteorology , physics
Class A and H oil well cements are compared at 25° and 50°C with 0%, 1%, 2%, and 4% CaCl 2 . Up to 4% CaCl 2 accelerated Class A thickening, but 4% led to slower thickening than 2% for Class H. C 3 S hydration in the two cements responded differently to CaCl 2 . CaCl 2 always accelerated aluminate hydration. For Class A, CaCl 2 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 CaCl 2 concentration. Ettringite to monosulfate conversion and Friedel's salt formation were sometimes seen.