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Pore structure characterisation of GGBS/OPC grouts using solvent techniques
Several attempts have been made to correlate the permeability of cement based systems and their pore structure characteristics although a unic relationship has yet to be found. At the centre of the problem lies the difficulty of characterizing a highly complex and delicate pore structure using a set of relatively crude techniques such as oven drying and mercury porosimetry. Simple counter diffusion does not occur in GGBS/OPC grouts immersed in methanol and propan-2-ol. The anomalous behaviour is a function of solvent type, GGBS/OPC ratio and period of curing prior to test. Interpretation of solvent exchange data is complicated by the generation of vacated pore space during the exchange process. Methanol appears able to largely refill this space whilst propan-2-ol only achieves it at early ages. This behaviour is a consequence of the production of a highly constricted pore structure after short periods of hydration. The results suggest that the exchange process generates vacated pore space yielding anomalous weight and length to preclude the determination of diffusion coefficients. The degree of this behaviour is a function of GGBS/OPC ration, curing and solvent. Thus, the technique is unable to yield diffusion coefficients for these grouts.
Pore structure characterisation of GGBS/OPC grouts using solvent techniques
Several attempts have been made to correlate the permeability of cement based systems and their pore structure characteristics although a unic relationship has yet to be found. At the centre of the problem lies the difficulty of characterizing a highly complex and delicate pore structure using a set of relatively crude techniques such as oven drying and mercury porosimetry. Simple counter diffusion does not occur in GGBS/OPC grouts immersed in methanol and propan-2-ol. The anomalous behaviour is a function of solvent type, GGBS/OPC ratio and period of curing prior to test. Interpretation of solvent exchange data is complicated by the generation of vacated pore space during the exchange process. Methanol appears able to largely refill this space whilst propan-2-ol only achieves it at early ages. This behaviour is a consequence of the production of a highly constricted pore structure after short periods of hydration. The results suggest that the exchange process generates vacated pore space yielding anomalous weight and length to preclude the determination of diffusion coefficients. The degree of this behaviour is a function of GGBS/OPC ration, curing and solvent. Thus, the technique is unable to yield diffusion coefficients for these grouts.
Pore structure characterisation of GGBS/OPC grouts using solvent techniques
Charakterisierung der Porenstruktur von GGBS/OPC-Vergußmörtel mittels Lösungstechniken
Hughes, D.C. (author) / Crossley, N.L. (author)
Cement and Concrete Research ; 24 ; 1255-1266
1994
12 Seiten, 11 Bilder, 9 Quellen
Article (Journal)
English
Portlandzement , poröser Werkstoff , Porosität , Messung , Lösungsmittel , Alkohol , Adsorption , Pore , Mikrogefüge , Diffusionskoeffizient , Tricalciumsilicat , Dicalciumsilicat , Calciumsilicat , Calciumaluminathydrat , Tetracalciumaluminatferrit , Austauschbarkeit , Porengrößenverteilung , Porositätsmessung , Porenstruktur
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