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Отправлено: 15.10.08 03:54. Заголовок: Using pore parameters to estimate permeability or conductivity of concrete
Using pore parameters to estimate permeability or conductivity of concrete Materials and Structures Springer Netherlands ISSN 1359-5997 (Print) 1871-6873 Volume 41, Number 1 2008 г. DOI 10.1617/s11527-006-9212-y pp. 1-16 Original article Using pore parameters to estimate permeability or conductivity of concrete M. R. Nokken1 and R. D. Hooton2 (1) Concordia University, Montreal, QC, Canada (2) University of Toronto, Toronto, ON, Canada Received: 6 March 2006 Accepted: 14 November 2006 Published online: 23 January 2007 Abstract This study investigated the relationships between pore parameters and transport properties. Fourteen concrete mixtures were investigated for water permeability, conductivity for the pore solutions and bulk concrete, as well as total porosity and critical pore diameter. The measured parameters allowed comparison to the Katz–Thompson relationship as well as Archie’s Law. Using a low-pressure device, measured permeability from 1 to 28 days was found to be approximately an order of magnitude higher than that calculated using the Katz–Thompson relationship for the six mixtures examined with this technique. Better agreement between measured and predicted permeability was found using apparatus capable of higher applied pressure. Comparing the data to other published data, the Katz–Thompson relationship seems to be a useful technique for the approximation of water permeability. The exponential relationship between porosity and normalized conductivity (the inverse of the Formation factor) forming the basis of Archie’s Law was found to hold within each specific concrete mixture. However, no overall trend was apparent. The constants of the Archie’s Law vary over a wide range. Keywords Pore size - Pore solution - Conductivity - Permeability - Katz–Thompson - Archie’s Law -------------------------------------------------------------------------------- M. R. Nokken Email: nokken@bcee.concordia.ca References 1. Hooton RD, Wakeley LD (1989) Influence of test conditions on water permeability on concrete in a triaxial cell. In: Pore structure and permeability of cementitious materials. Materials Research Society, Boston 2. CRD-C 48-92 (1992) Standard test method for water permeability of concrete. Handbook of cement and concrete. U.S. Army Corps of Engineers 3. CRD-C 163-92 (1992) Standard test method for water permeability of concrete using triaxial cell. US Federal Standards 4. El-Dieb AS, Hooton RD (1994) A high pressure triaxial cell with improved measurement sensitivity for saturated water permeability of high performance concrete. Cement Concrete Res 24(5):854–862 5. Carman PC (1956) Flow of gases through porous media. Academic, New York 6. Garboczi EJ (1990) Permeability, diffusivity, and microstructural parameters. A critical review. Cement Concrete Res 20(4):591–601 7. Powers TC (1958) Structure and physical properties of hardened Portland cement paste. J Am Ceram Soc 41(1):1–6 8. Mehta PK, Manmohan D (1980) Pore size distribution and permeability of hardened cement pastes. In: 7th International Congress of the Chemistry of Cement. Editions Septima, Paris 9. Goto S, Roy DM (1981) The effect of w/c and curing temperature on the permeability of hardened cement paste. Cement Concrete Res 11(4):575–579 10. Nyame BK, Illston JM (1980) Capillary pore structure and permeability of hardened cement paste. In: 7th International Congress on the Chemistry of Cement, Paris 11. Winslow DN, Diamond S (1970) Mercury porosimetry study of the evolution of porosity in portland cement. J Mater 5(3):564–585 12. Roy DM (1989) Relationships between permeability, porosity, diffusion, and microstructure of cement pastes, mortar, and concrete at different temperatures. In: Pore structure and permeability of cementitious materials. Materials Research Society, Boston 13. Marsh BK (1984) Relationship between engineering properties and microstructural characteristics of hardened cement paste containing pfa as a partial cement replacement. Hatfield Polytechnic, p 236 14. Hughes DC (1985) Pore structure and permeability of hardened cement paste. Mag Concrete Res 37(133):227–233 15. Li S, Roy DM (1986) Investigation of relations between porosity, pore structure and Cl− diffusion of fly ash and blended cement pastes. Cement Concrete Res 16:749–759 16. Nyame BK, Illston JM (1981) Relationships between permeability and pore structure of hardened cement paste. Mag Concrete Res 33(116):139–146 17. Katz AJ, Thompson AH (1986) Quantitative prediction of permeability in porous rock. Phys Rev B 34(11):8179–8181 18. Christensen, BJ, Mason TO, Jennings HM (1996) Comparison of measured and calculated permeabilities for hardened cement pastes. Cement Concrete Res 26(9):1325–1334 19. El-Dieb AS, Hooton RD (1994) Evaluation of the Katz–Thompson model for estimating the water permeability of cement-based materials from mercury intrusion porosimetry data. Cement Concrete Res 24(3):443–455 20. Tumidajski PJ, Lin B (1998) On the validity of the Katz–Thompson equation for permeabilities in concrete. Cement Concrete Res 28(5):643–647 21. Halamickova P et al (1995) Water permeability and chloride ion diffusion in portland cement mortars: relationship to sand content and critical pore diameter. Cement Concrete Res 25(4):790–802 22. Hooton RD (1986) Permeability and pore structure of cement pastes containing fly ash, slag, and silica fume. In: Blended cements. ASTM, Denver, CO, Committee C-1 on Cement, Philadelphia, PA, USA 23. Cox AJ (1990) Utilization of high strength concrete, in civil engineering. University of Toronto 24. Katz AJ, Thompson AH (1987) Prediction of rock electrical conductivity from mercury injection measurements. J Geophys Res 92(B1):599–607 25. Bentz DP (2004) Personal communication. Received by: Nokken MR (May, 2004) 26. Tumidajski PJ, Schumacher AS (1996) On the relationship between the formation factor and propan-2-ol diffusivity in mortars. Cement Concrete Res 26(9):1301–1306 27. Daw GP (1971) A modified Hoek-Franklin triaxial cell for rock permeability measurements. Geotechnique 21:89–91 28. Barneyback RS Jr, Diamond S (1981) Expression and analysis of pore fluids from hardened cement pastes and mortars. Cement Concrete Res 11(2):279–285 29. Bentz DP et al (2000) Influence of silica fume on diffusivity in cement-based materials I Experimental and computer modeling studies on cement pastes. Cement Concrete Res 30(6):953–962 30. Coverdale RT et al (1995) Interpretation of impedance spectroscopy of cement paste via computer modelling. Part I: bulk conductivity and offset resistance. J Mater Sci Lett 30:712–719 31. Archie GE (1942) The electrical resistivity log as an aid to determining some reservoir characteristics. AIME Trans 146:54 32. Wong P-Z, Koplik J, Tomanic JP (1984) Conductivity and permeability of rocks. Phys Rev B 30(11):6606–6614 33. Tumidajski PJ et al (1996) On the relationship between porosity and electrical resistivity in cementitiuous systems. Cement Concrete Res 26(4):539–544 34. Christensen BJ et al (1994) Impedance spectroscopy of hydrating cement-based materials: measurement, interpretation, and application. J Am Ceram Soc 2789–804 35. Taffinder GG, Batchelor B (1993) Measurement of effective diffusivities in solidified waste. J Environ Eng 119:17–33 36. Hearn N, Mills RH (1991) Simple permeameter for water or gas flow. Cement Concrete Res 21(2–3):257–261 37. ASTM C 1202 (1997) Electrical indication of concrete’s ability to resist chloride ion penetration. American Society for Testing and Materials 38. Christensen BJ, Mason TO, Jennings HM (1992) Influence of silica fume on the early hydration of Portland cements using impedance spectroscopy. J Am Ceram Soc 75(4):939–945 39. Snyder KA et al (2003) Estimating the electrical conductivity of cement paste pore solutions from OH−, K+ and Na+ concentrations. Cement Concrete Res 33:793–798 40. Diamond S (1983) Effects of microsilica (silica fume) on pore solution chemistry of cement pastes. J Am Ceram Soc 66(5):82–84
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