期刊
CONSTRUCTION AND BUILDING MATERIALS
卷 24, 期 5, 页码 631-639出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2009.11.006
关键词
Gypsum; Anhydrite; Composite cements; Hydration; Slag; Low energy cements; Durability
资金
- Conacyt Mexico [39902]
- GCC TP
The effect of various additives (Ca(OH)(2), K2SO4, Na2SO4, Al-2(SO4)(3)) was evaluated on the hydraulic character and stability of pastes of 50-75% Fluorgypsum, 15-30% Portland cement and 10-20% Blast furnace slag. Characterization included length changes, compressive strength, SEM, DTA and XRD. The combination of Na2SO4 and Al-2(SO4)(3) favored early strength but caused detrimental expansion and strength losses after 90 days; whereas the use of only K2SO4 was favorable for strength and dimensional stability. The type of additive had a more important effect on stability and strength than the amounts of cement and slag. XRD indicated the presence of anhydrite, gypsum, ettringite, CaCO3 and an unidentified phase, the interaction of these is proposed to explain the behavior of the cements investigated. SEM showed that cement and slag reacted forming C-S-H that enhanced the hydraulic character by engulfing the gypsum crystals. (C) 2009 Elsevier Ltd. All rights reserved.
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