Beyond the Sorptivity: Definition, Measurement, and Properties of the Secondary Sorptivity
Publication: Journal of Materials in Civil Engineering
Volume 30, Issue 4
Abstract
Capillary imbibition in brick, stone, and concrete occurs in two stages. The primary process, which occurs in the standard test to measure sorptivity, is a spontaneous imbibition in which air is displaced by the invading liquid (usually water). In primary imbibition, the displacement of air is incomplete, and some air is trapped. The residual air content lies usually in the range 0.1–0.4 of the volume-fraction porosity. Primary imbibition is followed by a much slower secondary process in which trapped air in the interior of the material dissolves in the liquid phase and diffuses to the unsealed external surfaces, where it escapes. As air is lost, there is further imbibition of liquid to replace it. Eventually, all trapped air is lost, and the material reaches saturation. There is current interest in using the rate of secondary imbibition to define a secondary sorptivity, and speculation that this may be a useful property for characterizing porous construction materials, particularly in relation to durability. This paper analyzes the secondary imbibition process and provides a definition of the secondary sorptivity which is independent of the dimensions of the test specimen. The analysis is supported by experimental data on Ancaster and Portland limestone test materials.
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Acknowledgments
Andrea Hamilton acknowledges financial support from the U.K. Engineering and Physical Sciences Research Council (Grant No. EP/L014041/1).
References
Alava, M., Dubé, M., and Rost, M. (2004). “Imbibition in porous media.” Adv. Phys., 53(2), 83–175.
ASTM. (2004). “Standard test method for measurement of rate of absorption of water by hydraulic-cement concretes.” C1585–04, West Conshohocken, PA.
Blunt, M. (2017). Multiphase flow in permeable media, Cambridge University Press, Cambridge, U.K.
Fagerlund, G. (1993). “The long time water absorption in the air-pore structure of concrete.”, Lund Univ., Lund, Sweden.
Ferrell, R. T., and Himmelblau, D. M. (1967). “Diffusion coefficients of oxygen and nitrogen in water.” J. Chem. Eng. Data, 12(1), 111–115.
Ghasemzadeh, F., and Pour-Ghaz, M. (2015). “Effect of damage on moisture transport in concrete.” J. Mater. Civ. Eng., 04014242.
Gummerson, R. J., Hall, C., and Hoff, W. D. (1980). “Capillary water transport in masonry structures: Building construction applications of Darcy’s law.” Constr. Pap., 1(1), 17–27.
Hall, C. (1989). “The sorptivity of mortars and concretes: A review.” Mag. Concr. Res., 41(147), 51–61.
Hall, C. (2017). “Capillary water absorption by a porous cylinder.” J. Build. Phys., in press.
Hall, C., and Hamilton, A. (2015). “Porosity-density relations in stone and brick materials.” Mater. Struct., 48(5), 1265–1271.
Hall, C., and Hamilton, A. (2016). “Porosities of building limestones: using the solid density to assess data quality.” Mater. Struct., 49(10), 3969–3979.
Hall, C., and Hoff, W. D. (2002). Water transport in brick, stone and concrete, 1st Ed., Taylor & Francis, New York.
Hall, C., and Hoff, W. D. (2012). Water transport in brick, stone and concrete, 2nd Ed., Taylor & Francis, New York.
Henkensiefken, R., Castro, J., Bentz, D., Nantung, T., and Weiss, J. (2009). “Water absorption in internally cured mortar made with water-filled lightweight aggregate.” Cem. Concr. Res., 39(10), 883–892.
Hens, H. (1976). “Die hygrischen Eigenschaften von Ziegel.” Proc., 4th Int. Brick Masonry Conf., Bruges, Belgium.
Hirschwald, J. (1912). Handbuch der bautechnischen Gesteinsprüfung, Bornträger, Berlin.
Ioannou, I., Charalambous, C., and Hall, C. (2017). “The variation of the water sorptivity with temperature.” Material. Struct., 50(5), 208.
Kurtis, K., Burris, L., and Alaptai, P. (2016). “Consider functional equivalence: A (faster) path to up-scaling sustainable infrastructure materials compositions.” Proc., 1st Int. Conf. on Grand Challenges in Construction Materials, Los Angeles, 380–388.
Li, W., Pour-Ghaz, M., Castro, J., and Weiss, J. (2012). “Water absorption and critical degree of saturation relating to freeze-thaw damage in concrete pavement joints.” J. Mater. Civ. Eng., 299–307.
Liu, Z., and Hansen, W. (2016). “A geometrical model for void saturation in air-entrained concrete under continuous water exposure.” Constr. Build. Mater., 124, 475–484.
Roels, S., et al. (2004). “Interlaboratory comparison of hygric properties of porous building materials.” J. Thermal Environ. Build. Sci., 27(4), 307–325.
Schaffer, R. J. (1932). The weathering of natural building stones, HMSO, London.
Wei, Z., et al. (2017). “The durability of cementitious composites containing microencapsulated phase change materials.” Cem. Concr. Compos., 81, 66–76.
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Published In
Journal of Materials in Civil Engineering
Volume 30 • Issue 4 • April 2018
Copyright
©2018 American Society of Civil Engineers.
History
Received: Jul 23, 2017
Accepted: Oct 3, 2017
Published online: Feb 9, 2018
Published in print: Apr 1, 2018
Discussion open until: Jul 9, 2018
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