Compressive strength of extruded unfired clay masonry units


Heath, A., Walker, P., Fourie, C. and Lawrence, M., 2009. Compressive strength of extruded unfired clay masonry units. Proceedings of the Institution of Civil Engineers: Construction Materials, 162 (3), pp. 105-112.

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    Interest in traditional unfired clay building materials has grown in the UK in recent years. Although the use of traditional vernacular techniques, such as cob, adobe and rammed earth, have raised the profile of earthen architecture, wider impact on modern construction is likely to come from modern innovations such as extruded unfired masonry units. A large driver behind the move to unfired clay masonry is the significant reduction in embodied energy when compared with fired bricks and concrete blockwork, and the passive environmental control provided by clay. This paper summarises the results of extensive testing on commercial mass-produced extruded unfired clay bricks. The focus of this study was to investigate the properties affecting the compressive strength of these building products. Both theoretical models and test results demonstrate that the clay content plays a large role in defining the compressive strength of these materials. The reduction in strength with increases in moisture content are similar for different material sources and these strength reductions are unlikely to cause problems under normal operating conditions, even at relative humidity levels up to 95%.


    Item Type Articles
    CreatorsHeath, A., Walker, P., Fourie, C. and Lawrence, M.
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    URLURL Type
    DepartmentsFaculty of Engineering & Design > Architecture & Civil Engineering
    Research CentresBRE Centre in Innovative Construction Materials
    Publisher Statementcoma162-105.pdf: This article is available with permission from the Institution of Civil Engineers/Thomas Telford Publishing.
    ID Code16596


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