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      INDEX AND ENGINEERING PROPERTIES OF OREGON COB

      1 , , PhD, PE 2

      Journal of Green Building

      College Publishing

      Cob, Oregon cob, earthen building material, properties

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          Abstract

          Cob is an earthen building material comprised of sand, clay, straw, and water used for millennia to construct dwellings. Although cob construction largely died out during the nineteenth century, it is experiencing a revival in England and the Pacific Northwest of the United States. Little scientific research has investigated the engineering properties of cob, knowledge of which is important for modern-day design practices and code requirements. Researchers at Oregon State University investigated six different Oregon cob mixtures using a series of standard soils and concrete tests adapted for this material. The objectives were to characterize the constituents, to establish estimates for the magnitude of, and degree of variability in, the mixture properties, and to develop correlations between the engineering properties and mixture composition. Results indicated low to moderate variation in basic mixture properties (i.e., unit weight, moisture content, and sand equivalent), moderate variation in strength properties, and high variation in the elastic modulus. Several reasonable correlations were found between shrinkage, compressive strength, elastic modulus, and sand equivalent and between flexural strength and fiber tensile strength.

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          Most cited references 13

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          “Geomorphology and Soils, Willamette Valley, Oregon,”

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            “Strength and Composition of Willamette Valley Cob: An Earthen Building Material,”

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              “At Hollyhock,”

               G. Thomasen (2007)
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                Author and article information

                Journal
                jgrb
                Journal of Green Building
                College Publishing
                1552-6100
                1943-4618
                1943-4618
                Spring 2011
                : 6
                : 2
                : 88-106
                Author notes

                1Honors Baccalaureate, School of Civil and Construction Engineering, Oregon State University, Corvallis, Oregon 97331; PH (541) 908-5156; e-mail: qu.pullen@ 123456gmail.com (Corresponding author).

                2Assistant Professor, School of Civil and Construction Engineering, Oregon State University, Corvallis, Oregon 97331; PH (541) 737-2056; FAX (541) 737-3052; e-mail: todd.scholz@ 123456oregonstate.edu .

                Article
                jgb.6.2.88
                10.3992/jgb.6.2.88
                ©2011 by College Publishing. All rights reserved.

                Volumes 1-7 of JOGB are open access and do not require permission for use, though proper citation should be given. To view the licenses, visit https://creativecommons.org/licenses/by-nc/4.0/

                Page count
                Pages: 19
                Product
                Categories
                RESEARCH ARTICLES

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