| Title |
Effect of Various Partial Replacements of Cement with Blast Furnace Slag and Different Placing Times on Thermal Properties of Mass Concrete and Modeling Work |
| DOI |
https://doi.org/10.5659/JAIK_SC.2019.35.10.207 |
| Keywords |
Blast furnace slag; Setting time; Adiabatic temperature rise; Hydration heat analysis; Temperature crack |
| Abstract |
The aim of the research is analyzing the simple adiabatic temperature rising properties and the heat of hydration based on different placing
timing of the mass concrete depending on various replacing ratios of blast furnace slag to comparative analyze the thermal cracking index
and cracking possibility. As a result from the experiment, a suggested adiabatic temperature rising equation based on various blast furnace
slag replacing ratios can be provide favorable correlation with over 0.99 of R2 value by applying the initial induction period. With this
relationship, more accurate prediction of the amount of the hydration heat rising and heating timing, and it is known that there is an
approximately 13.1 °C of gap between plain concrete without blast furnace slag and concrete with 80 % of replacing blast furnace slag. To
control the setting time and heat rising gap, the mix designs between top and bottom concrete casts were changed 15 cases, and D, E, H, I,
and L models of controlling the heat of hydration showed 41.23 to 46.88 °C of core temperature and 0.98 to 1.27 of thermal cracking
index. Therefore the cracking possibility was 15 to 52 % of favorable results of possibly controlling both the cracking due to the internal
and external retainment and concrete temperature at early age. |