Surface characterization of blended cements by H2O and N2 sorption isotherms

Title: Surface characterization of blended cements by H2O and N2 sorption isotherms
Author(s): Ivindra Pane, Will Hansen
Paper category : conference
Book title: International RILEM Symposium on Concrete Science and Engineering: A Tribute to Arnon Bentur
Editor(s): J. Weiss, K. Kovler, J. Marchand, and S. Mindess
Print-ISBN: None
e-ISBN: 2912143926
Publisher: RILEM Publications SARL
Publication year: 2004
Nb references: 23
Language: English

Abstract: Microstructural analysis of blended cements has been conducted based on water and nitrogen sorption isotherms. Virgin pastes containing ordinary portland cement (OPC) and three blended cement systems containing supplementary cementitious materials (SCM) were investigated for two water-binder ratios (0.45 and 0.35). These systems contained 25% of total cementitious class-F fly ash (FA), 25% ground granulated blast furnace slag (GGBF), and 10% silica fume (SF). Water and nitrogen sorption isotherms were obtained at ages ranging from 0.5 day up to about 200 days. Solid surface area was determined based on Brunauer-Emment-Teller (BET) and volume-thickness theory. Surface area found from nitrogen isotherms were always smaller than those obtained from water isotherms, but both of them exhibited similar age-dependent behavior. Furthermore, it was found that the surface area obtained from the desorption branch of water sorption were more in agreement with findings in the literature. The result was found to be surprising and revealed that, for the systems investigated, the highest surface area hydration product was obtained for the OPC+GGBF blend. It was then followed by the products of OPC+SF, OPC alone, and OPC+FA.

Online publication: 2004-03-25
Classification: Microstructure
Publication type : full_text
Public price (Euros): 0.00
doi: 10.1617/2912143926.006