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    Effect of Synthetic Fibers and a Rheology Modifier on Settlement Cracking of Concrete

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    SM Report 116.pdf (3.356Mb)
    Issue Date
    2015-12
    Author
    Al-Qassag, Osama
    Darwin, David
    O’Reilly, Matthew
    Publisher
    University of Kansas Center for Research, Inc.
    Type
    Technical Report
    Is part of series
    SM Report;116
    Published Version
    https://iri.ku.edu/reports
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    Abstract
    Three series of concrete mixtures, consisting of 133 batches, were tested. The first series consisted of 27 control mixtures with a 24.3 percent cement paste content by volume and a water-to-cement ratio of 0.5. The second series consisted of 18 control mixtures with a 27 percent cement paste content by volume and a water-to-cement ratio of 0.45. The third series consisted of 88 mixtures with a 27 percent cement paste content and a water-to-cement ratio of 0.45. Fourteen batches in the third series served as controls; the remaining 74 mixtures were used to evaluate the effectiveness of crack reduction technologies on settlement cracking performance; fifty-seven mixtures contained from 1.5 lb/yd3 (0.89 kg/m3) to 7.5 lb/yd3 (4.45 kg/m3) of one of four different synthetic fibers, and 17 mixtures contained a rheology modifier in the form of a dry viscosity modifying admixture (dosed at 0.05% of mixture material dry weight). The results showed that settlement cracking increased as the slump of the mixture increased. The addition of fibers or the viscosity modifying admixture reduced settlement cracking compared to the mixtures without the additions. For a given slump, mixtures containing fibers exhibited less settlement cracking than the mixtures containing the viscosity modifying admixture. For a given slump, concrete containing the viscosity modifying admixture was more workable when shear force is applied compared to concrete containing fibers. With one exception, differences in settlement cracking as a function of fiber type were not statistically significant.
    URI
    http://hdl.handle.net/1808/20711
    Collections
    • Infrastructure Research Institute Scholarly Works [332]
    Citation
    Al-Qassag, O., Darwin, D., and O'Reilly, M., "Effect of Synthetic Fibers and a Rheology Modifier on Settlement Cracking of Concrete," SM Report No. 116, The University of Kansas Center for Research, Inc., Lawrence, KS, December 2015, 130 pp.

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    KU Libraries
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    Lawrence, KS 66045
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    Contact KU ScholarWorks
    785-864-8983
    KU Libraries
    1425 Jayhawk Blvd
    Lawrence, KS 66045
    785-864-8983

    KU Libraries
    1425 Jayhawk Blvd
    Lawrence, KS 66045
    Image Credits
     

     

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