Porosity-Cement Ratio Controlling Strength of Artificially Cemented Clays
Publication: Journal of Materials in Civil Engineering
Volume 23, Issue 8
Abstract
There exists an effort to develop dosage methodologies for cement improved soils based on a rational criterion, as in concrete technology, in which the water to cement ratio plays an essential role in strength determination. This study aims to assess the strength controlling parameters of two clays with distinct coarse grained materials (silty clay and sandy clay) treated with cement and to show that the porosity/cement ratio plays a fundamental role in target strength assessment of clayey materials. The controlling parameters evaluated were the cement content, porosity, and porosity/cement ratio. A number of unconfined compression tests and suction measurements were performed for the present work. The results show that a linear function better fits the unconfined compressive strength-cement relationship. The strength increased exponentially with the reduction in porosity for the studied soil-cement mixtures. Finally, the porosity/cement ratio is shown to be a key parameter in an evaluation of the unconfined compressive strength of the clayey soils studied.
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Acknowledgments
The writers wish to express their gratitude to Brazilian Research Council CNPq/MCT (projects Produtividade em Pesquisa, Edital Universal, PNPD, and INCT-Reageo) and to the Brazilian Electrical Energy Agency ANEEL (project P&D UNSPECIFIED0089-036/2006—UNSPECIFIEDCEEE-GT/9936455) for their financial support to the research group.
References
ASTM. (2006a). “Standard classification of soils for engineering purposes.” D 2487-06, Philadelphia.
ASTM. (2006b). “Standard test method for unconfined compressive strength of cohesive soil.” D 2166-06, Philadelphia.
ASTM. (2009). “Standard specification for portland cement.” C 150-09, Philadelphia.
Brazilian Standard Association. (1980). “Mortar and concrete—Test method for compressive strength of cylindrical specimens.” NBR 5739, Rio de Janeiro, Brazil (in Portuguese).
Chandler, R. J., Crilly, M. S., and Montgomery-Smith, G. (1992). “A low-cost method of assessing clay desiccation for low-rise buildings.” Proc. Inst. Civ. Eng.–Civ. Eng., 92(2), 82–89.
Clough, G. W., Sitar, N., Bachus, R. C., and Rad, N. S. (1981). “Cemented sands under static loading.” J. Geotech. Engrg. Div., 107(6), 799–817.
Consoli, N. C., Cruz, R. C., Floss, M. F., and Festugato, L. (2010). “Parameters controlling tensile and compressive strength of artificially cemented sand.” J. Geotech. Geoenviron. Eng., 136(5), 759–763.
Consoli, N. C., Dalla Rosa, F., and Fonini, A. (2009a). “Plate load tests on cemented soil layers overlaying weaker soil.” J. Geotech. Geoenviron. Eng., 135(12), 1846–1856.
Consoli, N. C., Foppa, D., Festugato, L., and Heineck, K. S. (2007). “Key parameters for strength control of artificially cemented soils.” J. Geotech. Geoenviron. Eng., 133(2), 197–205.
Consoli, N. C., Viana da Fonseca, A., Cruz, R. C., and Heineck, K. S. (2009b). “Fundamental parameters for the stiffness and strength control of artificially cemented sand.” J. Geotech. Geoenviron. Eng., 135(9), 1347–1353.
Mitchell, J. K. (1981). “Soil improvement—State-of-the-art report.” Proc., 10th Int. Conf. on Soil Mechanics and Foundation Engineering, Balkema, Rotterdam, Netherlands, 509–565.
Mitchell, J. K., and Soga, K. (2005). Fundamentals of soil behavior, 3rd Ed., Wiley, New York, 577.
Porbaha, A., Tanaka, H., and Kobayashi, M. (1998). “State of the art in deep mixing technology. Part II: Applications.” Proc. Inst. Civ. Eng.–Ground Improv., 2(3), 125–139.
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© 2011 American Society of Civil Engineers.
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Received: Apr 14, 2010
Accepted: Jan 26, 2011
Published online: Jan 28, 2011
Published in print: Aug 1, 2011
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