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경량 콘크리트의 휨·전단에 대한 설계기준의 안전성 평가
심재일(Sim Jea-Il),양근혁(Yang Keun-Hyeok) 대한건축학회 2011 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.31 No.2(구조계)
The safety and reliability of design procedures for lightweight concrete specified in ACI 318-08, EC2 and KCI provisions are confirmed using an extensive database. The modify factor to explain the reduced rupture modulus and shear strength of lightweight concrete was unconservative. Furthermore, the coefficients for the equivalent rectangular stress block recommended in ACI 318-08 are needed to be corrected in order to ensure the safe design of columns subjected to axial load level higher than proportional limit of tension.
양근혁,심재일,송진규,이정한,Yang, Keun-Hyeok,Sim, Jea-Il,Song, Jin-Gyu,Lee, Jung-Han 대한건축학회 2011 대한건축학회논문집 Vol.27 No.1
The present study evaluated the various material properties of concrete brick-masonry using alkali-activated (AA) ground granulated blast-furnace slag (GGBS) binder in order to examine the limitation and significance of environmental-friendly cementless masonry. The reasonable mixing proportions for cementless bricks and masonry mortar using AA GGBS binder were determined from the laboratory and practical plant tests. The compressive strengths of brick and masonry mortar were measured for individual cementless materials. In addition, compressive strength, elastic modulus, diagonal shear strength and modulus of elasticity in shear of masonry prisms were recorded for cementless masonry wall. The measured properties of GGBS-based AA concrete brick-masonry were compared with those of ordinary portland cement (OPC) concrete brick-masonry and empirical equations proposed by different codes including UBC-97, EC 6, and KBC-2009 and existing researchers, wherever possible. The present study clearly showed that the developed GGBS-based AA concrete brick-masonry can be practically applicable as environmental-friendly masonry structures.
양근혁(Yang Keun-Hyeok),심재일(Sim Jea-Il),송진규(Song Jin-Gyu),이정한(Lee Jung-Han) 대한건축학회 2011 大韓建築學會論文集 : 構造系 Vol.27 No.1
The present study evaluated the various material properties of concrete brick-masonry using alkali-activated (AA) ground granulated blast-furnace slag (GGBS) binder in order to examine the limitation and significance of environmental- friendly cementless masonry. The reasonable mixing proportions for cementless bricks and masonry mortar using AA GGBS binder were determined from the laboratory and practical plant tests. The compressive strengths of brick and masonry mortar were measured for individual cementless materials. In addition, compressive strength, elastic modulus, diagonal shear strength and modulus of elasticity in shear of masonry prisms were recorded for cementless masonry wall. The measured properties of GGBS-based AA concrete brick-masonry were compared with those of ordinary portland cement (OPC) concrete brick-masonry and empirical equations proposed by different codes including UBC-97, EC 6, and KBC-2009 and existing researchers, wherever possible. The present study clearly showed that the developed GGBS-based AA concrete brick-masonry can be practically applicable as environmental-friendly masonry structures.
알카리활성 무시멘트 경량모르타르의 유동성, 압축강도 및 내화특성
양근혁(Yang Keun-Hyeok),심재일(Sim Jea-Il),이설(Lee Seol),황혜주(Hwang Hey-Zoo) 대한건축학회 2009 大韓建築學會論文集 : 構造系 Vol.25 No.8
Sixteen cementless mortars using alkali-activated (AA) hwangtoh (HT) binder or AA ground granulated blast-furnace slag (GGBS) binder were mixed and tested. The main variables investigated were water-binder ratio, lightweight fine aggregate-to-binder ratio, and maximum size of lightweight aggregate. Initial flow and air content were measured in the fresh mortars, and compressive strength development was recoreded in the hardened mortars. In addition, fire resistance of the AA lightweight mortars was evaluated against the variation of water-binder ratio. Test results showed that the workability of AA GGBS lightweight mortars was commonly lower than that of AA HT lightweight mortars. On the other hand, compressive strength of AA GGBS lightweight mortars was greatly higher than that of the company AA HT lightweight mortars. The compressive strength of AA mortars tested increased with the increase of their oven-dry density, showing that higher increasing rate was developed in AA GGBS lightweight mortars than in AA HT lightweight mortars. In addition, higher residual compressive strength ratio under high temperature was observed in AA GGBS lightweight mortars than in the company AA HT lightweight mortars. In particular, the thermal conductivity of AA lightweight mortars was highly lower than that of oridinary portland cement pastes with the same oven-dry density. This indicates that AA GGBS lightweight mortar has the advantage over the fire resistance.