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    Volume 43, Issue 5 (September 2015)

    Dynamic CBR Test to Assess the Soil Compaction

    (Received 5 October 2013; accepted 24 June 2014)

    Published Online: 2015

    CODEN: JTEVAB

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    Abstract

    Earth structures require appropriate soil compaction, commonly assessed using the Proctor methods. In the case of cohesive soil and fly ash, whose permeability and mechanical properties depend on moisture content at compaction, compaction degree (% of maximum compaction) should not be the only parameter of estimation of soil compaction. Therefore, for such materials the California Bearing Ratio (CBR) could be used as a method of compaction assessment and an indicator of soil bearing capacity. Another and much more efficient method for the compaction control is the dynamic CBR (CBRd). This methodology is conducted by using a loading system employing a light falling weight deflectometer (LFWD), consisting of a falling weight to produce a defined force pulse on the CBR piston. In this paper, the CBR research was done for both static (classic) and dynamic methods on fly ash specimens without soaking them to replicate field conditions. A force of 2.44 kPa was applied to all specimens subjected to penetrations. Due to the speed of research execution of the dynamic CBR test, it could be used for running compaction control during embankment erection. Test results obtained from the tests on fly ash revealed that dynamic CBR could be recommended in the cases of embedded fine-grained soil with moisture contents insignificantly greater or less than optimum water content.


    Author Information:

    Zabielska-Adamska, Katarzyna
    Associate Professor, Department of Civil and Environmental Engineering, The Bialystok Univ. of Technology, Bialystok,

    Sulewska, Maria J.
    Associate Professor, Department of Civil and Environmental Engineering, The Bialystok Univ. of Technology, Bialystok,


    Stock #: JTE20130256

    ISSN:0090-3973

    DOI: 10.1520/JTE20130256

    Author
    Title Dynamic CBR Test to Assess the Soil Compaction
    Symposium ,
    Committee D18