Title:
Comparison of Strength–Maturity Models Accounting for Hydration Heat in Massive Walls
Author(s):
Keun-Hyeok Yang, Jae-Sung Mun, Do-Gyeum Kim, and Myung-Sug Cho
Publication:
IJCSM
Volume:
10
Issue:
1
Appears on pages(s):
47–60
Keywords:
high-strength concrete, in situ strength, mock-up, hydration heat, maturity, curing temperature
DOI:
10.1007/s40069-016-0128-9
Date:
3/31/2016
Abstract:
The objective of this study was to evaluate the capability of different strength–maturity models to account for the effectof the hydration heat on the in-place strength development of high-strength concrete specifically developed for nuclear facilitystructures under various ambient curing temperatures. To simulate the primary containment-vessel of a nuclear reactor, three1200-mm-thick wall specimens were prepared and stored under isothermal conditions of approximately 5 C (cold temperature),20 C (reference temperature), and 35 C (hot temperature). The in situ compressive strengths of the mock-up walls weremeasured using cores drilled from the walls and compared with strengths estimated from various strength–maturity modelsconsidering the internal temperature rise owing to the hydration heat. The test results showed the initial apparent activationenergies at the hardening phase were approximately 2 times higher than the apparent activation energies until the final setting. Thedifferences between core strengths and field-cured cylinder strengths became more notable at early ages and with the decrease inthe ambient curing temperature. The strength–maturity model proposed by Yang provides better reliability in estimating in situstrength of concrete than that of Kim et al. and Pinto and Schindler.