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전기로 환원슬래그를 제조 원료로 사용한 개량형 C<sub>12</sub>A<sub>7</sub> 광물계 급결제 및 성능 평가
조한상 ( Han Sang Cho ),황봉춘 ( Bong Choon Hwang ),문원식 ( Won Sik Moon ),박대철 ( Dae Cheol Park ),조남섭 ( Nam Sup Cho ) 한국폐기물자원순환학회 2015 한국폐기물자원순환학회지 Vol.32 No.2
This laboratory study showed the performance evaluations of a improved C<sub>12</sub>A<sub>7</sub> based mineral accelerator (I-CA) by both mortar and shotcrete tests. Performance of I-CA as a shotcrete accelerator was excellent by KCI-SC-102, which is a Korean specifications of shotcrete accelerator. In addition, I-CA showed equal qualities to the setting time and the compressive strength when compared those of the existing C<sub>12</sub>A<sub>7</sub> based mineral accelerator (CA). The I-CA was manufactured with 40wt.% of electric arc furnace reducing slag, 24wt.% of lime, and 36wt.% of bauxite, indicating that the commercialization of I-CA contributed to recycle electric arc furnace reducing slag and to reduce the manufacturing cost of C<sub>12</sub>A<sub>7</sub> based mineral accelerator due to the use a cheap raw material(electric arc furnace reducing slag), and to reduce the greenhouse gas emission due to the reductions in usage of lime and bauxite.
임주영(Lim Joo-Young),박해균(Park Hae-Geun),이명섭(Lee Myeong-Sub),조남섭(Cho Nam-Sup) 한국철도학회 2004 한국철도학회 학술발표대회논문집 Vol.- No.-
From the early 1980"s, the New Austrian Tunnelling Method (NATM) has been developed as a one of the standard tunneling method in Korea. Owing to the results of many researches, the practical problems of shotcrete has been improved for a last decade. However, the excess amount of rebound still remains one of the critical problems in shotcrete technology. In order to improve for this rebound problem, recently developed cement mineral accelerator has been successfully applied to several NATM tunnels in Korea. An experimental investigation was carried out in order to verify the rebound characteristics of wet-mix Steel Fiber Reinforced Shotcrete (SFRS) with powder types cement mineral accelerator. Mortar setting test, SEM analysis, bonding test under spring water condition and rebound test were conducted. From the result, wet-mix SFRS with cement mineral acelerator exhibited excellent bonding characteristics even spring water condition and less rebound ratio compared to the conventional liquid accelerator.