Hydration and Microstructure Development of OPC Blended with Calcium Aluminate and Sulfoaluminate Cements
The aim of this study is to compare the hydration kinetics and the mi crostructure development of binders based on Portland cement accelerated by early ettringite formation brought by mixed calcium aluminate cement and calci um sulfate (CAC+CS) or calcium sulfoaluminate cement and calcium sulfate (CSA+ CS).The ratio between OPC and rapid cement addition has been adjus ted to evaluate its impact on chemical and physical properties.Binders contai ning 70% and 5% of OPC have been compared, hydration being quicker for lower percentage of OPC, i.e.higher ettringite content.The phase assemblage has been followed over time by XRD-Rietveld, TGA and SEM-EDS analyses.Microstructure has been studied by SEM-BSE images.These systems are com plex in terms of phase development; there are crystalline phases (ettringite, calcium monosulfoaluminate, hemicarboaluminate, monocarboaluminate and Portlendite) and amorphous phases (C-S-H and AH3).Due to their strong in termixing, complementary techniques are essential for the understanding of the microstructural development.
AFm Blended cements Building chemistry Ettringite Hydration Rapid setting
Bizzozero Julien Scrivener Karen
Laboratory of construction materials,Swiss Federal Institute of Technology EPFL,Lausanne 1015,Switzerland
国际会议
武汉
英文
31-44
2013-10-23（万方平台首次上网日期，不代表论文的发表时间）