Distribution Deviation of Large Aggregates from Uniformity in Waste Containment Concrete. I: Quantitative Model Formulation
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Volume 18, Issue 1
Abstract
Even distribution of aggregate particles in matrices is the target of random mixing processes that are used in the preparation of construction materials to enhance the postplacement uniformity of characteristics. This is particularly important for waste containment barrier concrete where strength, durability, and minimal permeability are desirable. An index, herein referred to as the deviation index (DI) was developed and applied to the cross-sectional areas and volume elements of concrete containing large aggregate to describe distribution deviations of large aggregate particles from perfectly even volumetric distribution. The Poisson distribution and the goodness of fit test were used to describe deviations. Experimental results were obtained from concrete batching tests, designed and performed to compare two mixing methods (rodding and vibration) and a control. The results show no significant uneven distribution as the values are less than 19.6 at 5% significance level. Within the bounds of these low deviation values, the rodded samples deviated the most, and had the highest DI values (22, volumetrically and 65.32, areally). Sequentially batched samples show minimal variability in DI, indicating that the batch mixing processes were consistent.
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Acknowledgments
This research project was sponsored by Duke Energy Corporation at the Global Institute for Energy and Environmental Systems (GIEES) of the University of North Carolina at Charlotte. Special thanks go to Concrete Supply for providing the materials used in this research and to Mactec Engineering and Consulting of Georgia (formerly Law Engineering) for allowing the use of their concrete laboratory.
References
Bai, M., Elsworth, D., Inyang, H. I., and Roegiers, J. C. (1997). “Modeling contaminant migration with linear sorption in strongly heterogeneous media.” J. Environ. Eng., 123(11), 1116–1125.
Bai, M., Inyang, H. I., Chien, C. C., and Bruell, C. (2002). “Factors for assessing flow and transport in fractured porous media.” Special Publication on Remediation in Rock Masses, 1–11.
Bai, M., Roegiers, J. C., and Inyang, H. I. (1996). “Contaminant transport in nonisothermal fractured media.” J. Environ. Eng., 122(5), 416–423.
Crank, J. (1975). The mathematics of diffusion, Oxford University Press, Oxford, U.K.
Daniels, J. L., Inyang, H. I., and Iskandar, A. (2003). “Durability of Boston blue clay in waste containment applications.” J. Mater. Civ. Eng., 15(2), 144–152.
Davis, J. C. (1973). Statistics and data analysis in geology, Wiley, New York.
Fleming, L. N., and Inyang, H. I. (1995). “Permeability of clay-modified fly-ash under thermal gradient.” J. Mater. Eng., 7(3), 178–182.
Gaunt, P. N., and Gaunt, W. A. (1978). Three dimensional reconstruction in biology, Pitman Medical, London.
Inyang, H. I., Iskandar, A., and Parikh, J. M. (1997). “Physico-chemical interactions in waste containment barriers.” Encyclopedia of environmental analysis and remediation, Vol. 2, Wiley, New York, 1158–1165.
North Carolina Department of Transportation (NCDOT). (1998). “Hot mix asphalt quality management system manual.” Asphalt technology, construction and inspection training manual, Raleigh, N.C.
Shi, B., Inyang, H., and Chen, J. (2000). “Techniques for analyzing microstructures of barrier materials in waste containment systems.” Proc., 4th Int. Symp. on Environmental Geotechnology and Global Sustainable Development, Boston, 1207–1215.
Shi, B., Murakami, Y., Wu, Z., Chen, J., and Inyang, H. I. (1999a). “Monitoring internal failure evolution in soils using computerized x-ray tomography (CT).” Eng. Geol. (Amsterdam), 54(3–4), 321–328.
Shi, B., Wu, Z., Inyang, H. I., Chen, J., and Wang, B. (1999b). “Preparation of soil specimens for SEM analysis using freeze-cut-drying.” Bulletin of the International Association of Engineering Geology and Environment, 58, 1–7.
Stephansson, O., and Wang, W. X. (1992). “Automatic image processing of aggregates.” Proc., ISRM Symp.: Eurock ’92, Chester, U.K., 31–35.
Steude, J. S., Hopkins, F., and Anders, J. E. (1994). “Industrial x-ray computed tomography applied to soil research.” Special Publication No. 36, Soil Science Society of America, Madison, Wis., 29–41.
Tikalsky, P. J., Mather, B., and Olek, J. (2000). “Concrete durability.” A2E01: Committee on Durability of Concrete ⟨http://www.nationalacademies.org/trb/publications/millenium/00020.pdf⟩ (April 9, 2002).
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© 2006 ASCE.
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Received: Nov 25, 2003
Accepted: Nov 9, 2004
Published online: Feb 1, 2006
Published in print: Feb 2006
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Note. Associate Editor: Zhishen Wu
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