|
Title |
Evaluation of Spalling Characteristics and Fire Resistance Fiber-Entrained Mixed Cement Concrete at Ultra-High Temperatures
|
|
Authors |
오준환(Jun-Hwan Oh) ; 천주현(Ju-Hyun Cheon) ; 이만수(Man-Soo Lee) ; 유성원(Sung-Won Yoo) |
|
DOI |
https://doi.org/10.11112/jksmi.2023.27.5.23 |
|
Keywords |
슬래그 콘크리트; 폭렬; 초고온; 내화; 섬유 Slag concrete; Spalling; Ultra-high temperature; Fire resistance; Fiber |
|
Abstract |
The goal of this study is to evaluate the bursting characteristics and fire resistance performance of mixed cement concrete containing fibers at very high temperatures. For this purpose, FA-based, Slag-based, and each mix according to the amount of fiber mixed were heated to room temperature, 150°C, 300°C, 600°C, and 900°C, and then the burst shape, compressive strength, and elastic modulus were measured and evaluated. As a result of the experiment, it was found that relatively more surface damage occurred in FA-based specimens when heated at ultra-high temperatures than in slag-based specimens, and there was a difference between the mix without fibers and the mix with fibers when heated at ultra-high temperatures, that is, at 900°C. In the mix without fibers, a decrease in strength of more than 5% occurred. In addition, the elastic modulus also showed the same phenomenon as the compressive strength, and in particular, the decrease in elastic modulus was found to be greater than the amount of decrease in compressive strength. Meanwhile, estimation equations for compressive strength and elastic modulus according to heating temperature were statistically proposed.
|