KUKU

KU ScholarWorks

  • myKU
  • Email
  • Enroll & Pay
  • KU Directory
    • Login
    View Item 
    •   KU ScholarWorks
    • Engineering
    • Infrastructure Research Institute Scholarly Works
    • View Item
    •   KU ScholarWorks
    • Engineering
    • Infrastructure Research Institute Scholarly Works
    • View Item
    JavaScript is disabled for your browser. Some features of this site may not work without it.

    Submicroscopic Cracking of Cement Paste and Mortar in Compression

    Thumbnail
    View/Open
    darwin_submicroscopic.pdf (9.314Mb)
    Issue Date
    1985-11
    Author
    Attiogbe, Emmanuel K.
    Darwin, David
    Publisher
    University of Kansas Center for Research, Inc.
    Type
    Technical Report
    Is part of series
    SM Report;16
    Published Version
    https://iri.ku.edu/reports
    Metadata
    Show full item record
    Abstract
    Submicroscopic cracking of cement paste and mortar under uniaxial compression is measured and correlated with applied strain and load history. Cement paste specimens with water-cement ratios of 0.7, 0.5 and 0.3 were subjected to monotonic, sustained or cyclic loading, while mortar specimens with a water-cement ratio of 0.5 were subjected to monotonic loading. One hundred and thirty ( 130) specimens were tested at ages ranging from 27 to 29 days, using a closed-loop servo-hydraulic testing machine. After loading, slices of material were removed for study at a magnification of 1 250x in a scanning electron microscope. Cracking on transverse and longitudinal surfaces was measured. Statistical and stereological models are developed to convert the surface crack distributions to three-dimensional distributions. A self-consistent model is developed tc estimate the elastic moduli of transversely isotropic cracked materials. These models are used to correlate submicrocracking with the reduction in stiffness and the shape of the stress-strain curve. The surface crack densities in cement paste and mortar are about ten times the density of bond and mortar microcracks in concrete at the same value of compressive strain. Submicrocracking accounts for a significant portion (20% to 90%) of the nonlinear respons of cement paste and mortar at all levels of applied compressive strain. As compressiVE strain increases, other mechanisms, such as large microcracks, macrocracks, and creep, play an increasingly greater role.
    URI
    http://hdl.handle.net/1808/20398
    Collections
    • Infrastructure Research Institute Scholarly Works [324]
    Citation
    Attiogbe, E., and Darwin, D., "Submicroscopic Cracking of Cement Paste," SM Report No. 16, Research Grant AFOSR-85-0194, The Air Force Office of Scientific Research, November 1985, 466 pp.

    Items in KU ScholarWorks are protected by copyright, with all rights reserved, unless otherwise indicated.


    We want to hear from you! Please share your stories about how Open Access to this item benefits YOU.


    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
     

     

    Browse

    All of KU ScholarWorksCommunities & CollectionsThis Collection

    My Account

    LoginRegister

    Statistics

    View Usage Statistics

    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
     

     

    The University of Kansas
      Contact KU ScholarWorks
    Lawrence, KS | Maps
     
    • Academics
    • Admission
    • Alumni
    • Athletics
    • Campuses
    • Giving
    • Jobs

    The University of Kansas prohibits discrimination on the basis of race, color, ethnicity, religion, sex, national origin, age, ancestry, disability, status as a veteran, sexual orientation, marital status, parental status, gender identity, gender expression and genetic information in the University’s programs and activities. The following person has been designated to handle inquiries regarding the non-discrimination policies: Director of the Office of Institutional Opportunity and Access, IOA@ku.edu, 1246 W. Campus Road, Room 153A, Lawrence, KS, 66045, (785)864-6414, 711 TTY.

     Contact KU
    Lawrence, KS | Maps