The Experts below are selected from a list of 3 Experts worldwide ranked by ideXlab platform

Natalya Shanahan - One of the best experts on this subject based on the ideXlab platform.

  • Effects of Portland Cement Particle Size on Heat of Hydration
    2014
    Co-Authors: A. Zayed, Ahmadreza Sedaghat, Andre Bien-aime, Natalya Shanahan
    Abstract:

    Following specification harmonization for Portland Cements, Florida Department of Transportation (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.

A. Zayed - One of the best experts on this subject based on the ideXlab platform.

  • Effects of Portland Cement Particle Size on Heat of Hydration
    2014
    Co-Authors: A. Zayed, Ahmadreza Sedaghat, Andre Bien-aime, Natalya Shanahan
    Abstract:

    Following specification harmonization for Portland Cements, Florida Department of Transportation (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.

Ahmadreza Sedaghat - One of the best experts on this subject based on the ideXlab platform.

  • Effects of Portland Cement Particle Size on Heat of Hydration
    2014
    Co-Authors: A. Zayed, Ahmadreza Sedaghat, Andre Bien-aime, Natalya Shanahan
    Abstract:

    Following specification harmonization for Portland Cements, Florida Department of Transportation (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.

Andre Bien-aime - One of the best experts on this subject based on the ideXlab platform.

  • Effects of Portland Cement Particle Size on Heat of Hydration
    2014
    Co-Authors: A. Zayed, Ahmadreza Sedaghat, Andre Bien-aime, Natalya Shanahan
    Abstract:

    Following specification harmonization for Portland Cements, Florida Department of Transportation (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.