Title:
Workability and Retardation Effects on Early CSA Hydration by Phosphono and Carboxylate Chemistries
Author(s):
Childs
Publication:
Web Session
Volume:
ws_S23_Childs.pdf
Issue:
Appears on pages(s):
Keywords:
DOI:
Date:
4/2/2023
Abstract:
Alternative binder chemistries, such as calcium sulfoaluminate (CSA) cements, often require admixtures to achieve set-time and workability requirements. A common carboxylate retarder for CSA cement, citric acid, is compared against a series of phosphono-group compounds for both retarding and workability capability. X-ray diffraction, pore solution analysis, and adsorption analysis were analyzed to understand the early hydration phase formation and retardation mechanism by each retarder utilized. While citric acid maintained the longest Vicat set time, it was found through mini-slump experiments that phosphono-based chemistries maintained higher mini-slump spreads compared to citric acid.