|
Title |
Evaluation of Pore Size Distribution and Chloride Diffusion in Steel Fiber Reinforced Mortar depending on Supplementary Cements
|
|
Authors |
홍성인(Sung-In Hong) ; 이현기(Hyeon-Gi Lee) ; 문도영(Do-Young Moon) |
|
DOI |
https://doi.org/10.4334/JKCI.2019.31.2.147 |
|
Keywords |
강섬유 ; 모르타르 ; 공극률 ; 염분확산 steel fiber ; mortar ; porosity ; chloride diffusion |
|
Abstract |
The use of steel fiber in concrete able to enhance the resistance to crack evolution in the material has been increasing. However, previous studies have indicated that corrosion related degradations observed in steel fiber reinforced concrete under accelerated chloride migration would be due to the local increase in the interface porosity between the fiber surface and cement matrix. In this study steel fiber reinforced mortar (SFRM) was fabricated with supplementary cementitious materials including granulated blast furnace slag (GGBS) and pulverized fly ash (PFA) in order to investigate the effects of pore structure characteristic in SPRM on the chloride diffusion. From the results of the pore size distribution obtained from the mercury porosimetry intrusion (MIP), the first rapid porosity increment was observed over the pore diameter of 10 μm which is indicative of the interface porosity and decreases with increased compressive strength at the same time. Also, the chloride diffusion coefficients obtained from the concentration profile through SPRM exposed to 1.0 M NaCl for 100 days decrease up to 26 % when using 30 % GGBS, as compared with the case of 100 % OPC.
|