Volume 24, Issue 2 (December 2002)

    Use of Cement By-pass Dust in Flowable Fill Mixtures

    (Received 3 July 2002; accepted 20 September 2002)

    CODEN: CCAOAD

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    Abstract

    Flowable fill is a self-compacted, cementitious material used primarily as a backfill in lieu of compacted fill. It is generally a mixture of sand, small amount of cement, fly ash, and water. Sand is the major component of most flowable fill mixes. Waste materials such as fly ash, ground granulated blast furnace slag, and foundry sand are commonly used to ensure low maximum compressive strength. Cement by-pass dust (CBPD) is considered a waste material of the production of cement. An estimated 25,000 tons of CBPD are produced annually in the Sultanate of Oman by Oman Cement Company alone. Most of this material is not effectively used and is disposed of on-site without any reuse causing environmental concerns. The main objective of this research is to investigate the potential use of CBPD in flowable fill mixtures as an alternative to fly ash and as a partial substitute for cement. The physical and chemical properties of both CBPD and cement were determined. Cube and cylindrical samples were prepared using different proportions of CBPD and water-to-cement ratios in order to select the optimum mixes that can be used in flowable fill applications. The optimum mixtures were cured in air and covered in plastic bags in order to study the effect of curing method on the compressive strength of flowable fill mixtures. Promising results were obtained with respect to the use of CBPD as a partial or full substitute for cement in flowable fill mixtures. Results also demonstrated that air cured samples gave a higher compressive strength than samples cured in the plastic bags for the mixes where CBPD was used as a partial substitute for cement. However, in mixes where CBPD was used to fully replace cement, samples that were cured in plastic bags produced higher strength than air cured samples at longer curing periods.


    Author Information:

    Al-Harthy, A
    Assistant Professor, Sultan Qaboos University, College of Engineering, Al-Khoudh,

    Al-Nuaimi, A
    Assistant Professor, Sultan Qaboos University, College of Engineering, Al-Khoudh,

    Al-Jabri, K
    Assistant Professor, Sultan Qaboos University, College of Engineering, Al-Khoudh,

    Taha, R
    Associate Professor, Sultan Qaboos University, College of Engineering, Al-Khoudh,

    Al-Oraimi, S
    Assistant Professor, Sultan Qaboos University, College of Engineering, Al-Khoudh,


    Stock #: CCA10533J

    ISSN: 0149-6123

    DOI: 10.1520/CCA10533J

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    Author
    Title Use of Cement By-pass Dust in Flowable Fill Mixtures
    Symposium , 0000-00-00
    Committee C01