|
Title |
Evaluation of Time-Dependent Chloride Resistance in HPC Containing Fly Ash Cured for 1 Year
|
|
Authors |
윤용식(Yong-Sik Yoon) ; 권성준(Seung-Jun Kwon) |
|
DOI |
https://doi.org/10.11112/jksmi.2018.22.4.052 |
|
Keywords |
촉진 염화물 확산계수 ; 압축강도 ; 플라이애시 ; 통과 전하량 ; 시간의존성지수 Accelerated chloride diffusion coefficient ; Compressive strength ; Fly ash ; Passed charge ; Time-parameter |
|
Abstract |
To control chloride attacks which is a representative deterioration in RC(Reinforced Concrete) structures, many studies have been conducted. Above all, a method using mineral admixture was known to be effective for corrosion protection. In this study, durability test about chloride attacks was carried out for concrete specimens containing FA(Fly Ash)-representative concrete mineral admixture and OPC concrete specimens considering 3 different levels of W/B(Water to Binder). Accelerated chloride diffusion coefficient tests referred to Tang's method, total passed charge tests referred to ASTM C 1202, and compressive strength tests based on KS F 2405 were performed at each target age day. Also, based on previous studies of 28 days, time-parameter which is a key parameter for diffusion behavior is evaluated and its relations with compressive strength at the age of 365 days is evaluated. After the age of 49 days, chloride resistance of FA concrete is much improved than that of OPC concrete, which arose out of stable hydrates due to pozzolan reaction of fly ash. Time-parameter of FA concrete is evaluated to be about 1.5 times larger than that of OPC concrete. Also, time-parameter of FA concrete has a linearly decreasing relation while that of OPC concrete has a linearly increasing relation with compressive strength development.
|