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Effects of portland cement particle size on heat of hydration.

File Language:
English


Details

  • Creators:
    Zayed, Abla
  • Corporate Creators:
    University of South Florida. Dept. of Civil and Environmental Engineering
  • Subject/TRT Terms:
  • Publication/ Report Number:
    BDK84 977-13
  • Resource Type:
    Tech Report
  • Geographical Coverage:
    Florida
  • Corporate Publisher:
    Florida. Dept. of Transportation. Research Center
  • Abstract:
    Following specification harmonization for portland cements, FDOT engineers reported signs of ; deterioration in concrete elements due to temperature rise effects. One of the main factors that affect ; concrete temperature rise potential is the heat generated by portland cement during hydration. This study ; was initiated to identify the effect of cement fineness on the heat generated by portland cement. Eleven ; cements were selected for this study to address the effects of cement fineness and mineralogy. Several ; of the cements came from the same source but had different grinds. This was important in studying the ; fineness contribution to heat of hydration while maintaining similar cement mineralogy. The as-received ; cements from different suppliers had a wide range of mineralogical compositions which allowed the ; study of the effects of mineralogy on the heat of hydration. Cements were characterized through oxide ; chemical analysis, x-ray diffraction, Blaine fineness, laser particle size analysis, setting behavior, and ; strength measurements. Additionally, limited restrained shrinkage experiments were performed on two ; of the cements from the same source to determine the effect of cement fineness on restrained shrinkage. ; The findings indicate that cement fineness is better correlated to 7-day heat of hydration than the heat ; index expressed as C3S + 4.75 C3A. Additionally, the results indicate that a finer cement experiences ; higher shrinkage than a coarser cement. Comparison of activation energies indicates that cements with ; higher fineness have lower activation energy. For Type II moderate heat (MH) portland cements that ; will be used in structural concrete elements where there is a risk of cracking due to thermal stresses, it ; is recommended that limits be placed on the heat of hydration, the Blaine fineness, and the heat index.
  • Format:
    PDF
  • Download URL:
    https://rosap.ntl.bts.gov/view/dot/26987/dot_26987_DS1.pdf
  • File Type:
    Filetype[PDF - 2.15 MB]
  • Collection(s):
    US Transportation Collection
  • Main Document Checksum:
    urn:sha256:0ab0ce1440a975d43b11019742bd1c24dc8670f02c7a3d695710cd2e961aa902
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