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:

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