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http://dx.doi.org/10.14190/JRCR.2014.2.1.052

Study on Mechanical Properties of Geopolymer Concrete using Industrial By-Products  

Kim, Si-Hwan (Korea Institute of Construction Technology)
Koh, Kyung-Taek (Korea Institute of Construction Technology)
Lee, Jang-Hwa (Korea Institute of Construction Technology)
Ryu, Gum-Sung (Korea Institute of Construction Technology)
Publication Information
Journal of the Korean Recycled Construction Resources Institute / v.2, no.1, 2014 , pp. 52-59 More about this Journal
Abstract
This study examines the compressive strength, elastic modulus and splitting tensile strength of geopolymer concrete in order to evaluate its mechanical characteristics according to the admixing of fly ash and blast furnace slag. Moreover, identical tests are also conducted considering the amount of powder, the mixing ratio of alkali activator and the mixing ratio of silica fume for further comparative analysis considering various variables. The comparison with the formulae specified in Korean and overseas codes reveal that a mixing ratio of 18% is adequate for the alkali activator and that a replacement ratio of 5% by silica fume is recommended for silica fume. The elastic modulus of the geopolymer concrete appears to increase slightly with the increase of the compressive strength per variable and age and to be smaller than the values predicted by the formulae specified in Korean and overseas codes. In addition, the examination of the stress-strain curves shows that the geopolymer concrete exhibits ductile behavior compared to the conventional OPC. In view of the splitting tensile strength, high strength is observed for a powder content of $400kg/m^3$ and a replacement ratio of 18% by silica fume. The resulting ratio of the compressive strength to the splitting tensile strength is seen to range between 8.7 and 10.2%.
Keywords
Blast furnace slag; Fly ash; Geopolymer Concrete; Modulus of elasticity; Splitting Tensile Strength;
Citations & Related Records
Times Cited By KSCI : 6  (Citation Analysis)
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