http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
박조범,류득현,서치호,Park, Cho-Bum,Ryu, Deuk-Hyun,Seo, Chee-Ho 대한건축학회 2012 대한건축학회논문집 Vol.28 No.3
In this study, to reduce carbon dioxide caused global warming, it attempts to manufacture high volume mineral admixture (HVMA) concrete using large content of by-products blast furnace slag and fly ash, and 10 % of cement occurred carbon dioxide. As compressive strength of HVMA concrete is lower, the concrete experiment was performed using inorganic additives, an inorganic additives of CSA, anhydrous gypsum and calcium oxide, for strength increase of normal concrete degree. At the slump of concrete, CSA 1 % series was not showed loss of change after 1 hour, but CSA 2 % series showed significant loss of change after a hour. And air content of concrete was not change between initial and 1 hour later, so additives was not affect air content. Compressive strength of 28 days was measured 23.4~30.7 MPa at CSA 1 % and range of 25.4~39.1 MPa at CSA 2 %, it increased according to usage of CSA and anhydrous gypsum, but it did not show significant changes about use of calcium oxide. Elastic modulus of 28 days was measured 27.4~29.5 GPa at CSA 1 % and range of 27.2~32.0 GPa at CSA 2 %, and its range of change according to additives were lower compared to compressive strength. Considering fluidity and mechanical properties of concrete, it is judged that optimum combination ratio of additives for performance revelation of HVMA concrete at normal concrete area was CSA is 1 %, and anhydrous gypsum and calcium oxide is 2~4 % respectively. Therefore, HVMA concrete made by only 10 % of cement and a little inorganic additives is expected that reduce carbon dioxide at concrete in manufacturing field and match government policy of low carbon green growth.
박조범(Park Cho-Bum),최성우(Choi Sung-Woo),김경찬(Kim Kyung-Chan),지석원(Ji Suk-Won),류득현(Ryu Deug-Hyun) 한국콘크리트학회 2021 한국콘크리트학회 학술대회 논문집 Vol.33 No.1
강섬유 콘크리트는 철근콘크리트공사에서 철근을 사용하지 않거나 줄일 수 있어 생산성 향상에 큰 장점이 있다. 휨 하중에 대한 저항성을 높이기 위해서는 인장강도가 높은 강섬유를 사용하는 것이 유리하며, 인장강도 1,500 MPa이 1,000 MPa보다 휨 하중이 약 6.20~32.1 % 정도 높았고, 강섬유 사용량이 20, 40kg/m3보다는 80kg/m3를 사용하여야 그 성능이 더욱 큰 것으로 나타났다. Steel fiber concrete has a great advantage in improving productivity because it cannot use or reduce rebar in reinforced concrete construction. To increase the resistance to bending loads, it is benefit to use high tensile strength steel fiber, with a tensile strength of 1,500 MPa about 6.20~32.1 % higher flexural load than 1,000 MPa, and 80 kg/m3 greater performance than 20, 40 kg/m3.
박조범(Park, Cho-Bum),박창건(Park, Chang-Gun),백철우(Back, Chul-Woo),최성우(Choi, Sung-Woo),류득현(Ryu, Deug-Hyun) 한국콘크리트학회 2021 한국콘크리트학회 학술대회 논문집 Vol.33 No.2
콘크리트 공사에서 과도한 진동다짐에 의한 굵은 골재의 분리는 배합과 재령에 관계없이 강도발현에는 큰 영향이 없었다. 굵은 골재가 분리된 시험체의 압축강도는 유사하였으며, 탄성계수는 진동다짐 시험체가 101 %에서 113 % 까지 증가하였다. 진동다짐에 의한 굳은 콘크리트에서의 영향을 분석하기 위해서는 본 연구의 결과보다 다양한 배합인자와 진동조건에서 분석하여야 할 것으로 판단된다. The separation of aggregates by excessive vibration in concrete construction didn‘t significantly affect compressive strength regardless of mixtures and age. The compressive strength of specimen is separated aggregate was similar, and elastic modulus increased from 101 % to 113 %. In order to analyze effect of vibration compacting on hardened concrete, it is judged that it should be analyzed under various factors and vibration conditions rather than results of this study.