Effects of portland cement particle size on heat of hydration.

Details

• Creators:
  Zayed, Abla
• Corporate Creators:
  University of South Florida. Dept. of Civil and Environmental Engineering
• Subject/TRT Terms:
  Chemical Analysis Fineness Grain Size (Geology) Heat Of Hydration Mineralogy Portland Cement Concrete Shrinkage
• 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
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha256:0ab0ce1440a975d43b11019742bd1c24dc8670f02c7a3d695710cd2e961aa902
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/26987/dot_26987_DS1.pdf
• File Type:
  [PDF - 2.15 MB ]