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이백수,윤길봉,한천수 대한건축학회 2001 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.21 No.1
In this paper, prescription on the architectural standard specifications between China(CASS) and Korea(KASS) are compared focused on the part of transportation, placing, compacting and curing. According to the research, there are a lot of differences between KASS and CASS. In CASS, time limitation from discharging concrete to completing placement of concrete, transportation, placing and continuous placing time limit are provided in accordance with strength level such as below C30 and above C30. There are no provisions related to special purpose concrete in CASS.
중국과 한국의 건축공사 표준시방서 비교 : 콘크리트 품질관리 부분을 중심으로 Focused on the Part of Quality Control of Concrete
이백수,김은호,배정열,윤길봉,한천구 대한건축학회 2001 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.21 No.2
This paper investigates and compares the architectural standard specifications between Korea(KASS) and China(CASS), especially focused on quality control, in order to help construction engineer understand the both regulations. According to results, in case of KASS, specimens for compressive strength test is cylindrical type with 2 times of diameter to height. Quality inspection is regulated to be performed 1 times per 150㎥ of concrete. However, in case of CASS, cubic type specimens with 150㎜ of length is used. Quality inspection is regulated to be performed 1 times every 100th batch at least 100㎥.
현무암골재를 이용한 콘크리트의 역학적 특성에 관한 실험적 연구
이백수,김상우,윤기원,류현기,한천구 대한건축학회 2000 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.20 No.2
The objective of this paper is to investigate mechanical properties of concrete using granite stone produced from continent and basalt produced from cheju island. According to experimental results, Compressive strength, tensile strength and modulus of elasticity of concrete using basalt show to be less than those using granite stone by about 10∼12% repectively, while dynamic modulus of elasticity show reverse tendency. Relations of C/W and Compressive strength, tensile strength, modules of elasticity and dynamic modules of elasticity, which is capable of applying mixing design, are provided in Fig 4, 5, and Table 5.
현무암골재를 사용한 콘크리트의 역학적 특성에 관한 연구
한천구,이백수 청주대학교 산업과학연구소 2001 産業科學硏究 Vol.19 No.1
This paper is to investigate the mechanical properties of concrete using basalt aggregate A with large void, basalt aggregate B with small void and granite aggregates, respectively. According to test results, compressive, tensile and elastic modules of concrete using basalt aggregate are larger than those using granite aggregates by 10%, 10% and 12%, But, dynamic elastic modules of concrete using basalt aggregate is lower than that using granite aggregate.
한·중 건축공사 표준시방서의 큰크리트공사 규정에 대한 상호연구
김은호,배정렬,이백수,한천구 청주대학교 산업과학연구소 2002 産業科學硏究 Vol.19 No.2
This paper is intended to introduce the Chinese Architectural Standard Specifications(CASS) for Korean construction engineers and compare it with Korean Architectural Standard Specifications (KASS). According to the results, the prescription on the limitation of chloride contents is less than 0.3㎏/㎥ in KASS, but, less than 1% of cement weight in CASS. As for determining target strength, although the concept of specifying strength, which is combination of designed strength with strength compensation by low temperature, is applied in KASS, it is determined by applying designed strength only in CASS. Protecting period of concrete against physical and mechanical attacks requires more than 1day since placing in KASS, but, it needs more than 12㎏f/㎠ of compressive strength according to CASS. The appearance of test specimens for compressive strength is cylindrical type with 2 times of diameter to the height of specimens in KASS, while cubic type with 150㎜ of each side length.
PP섬유 혼입 및 횡구속재 변화에 따른 고성능 콘크리트의 폭열방지에 관한 실험적 연구
황인성 ( Hwang¸ Yin-seong ),이백수 ( Li¸ Bai-shou ),이병열 ( Lee¸ Byung-yul ),양성환 ( Yang¸ Seong-hwan ),한천구 ( Han¸ Cheon-goo ) 한국구조물진단유지관리공학회 2002 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.6 No.1
This study is an experimental study on the spalling resistance of high performance concrete with PP fiber contents and material for lateral confinement. According to the results, spalling occurs to all specimens that do not contain PP fiber and it is prevented in the specimens containing PP fiber by more than 0.05% after heating, so it shows good effect on the spalling resistance. Variation of material kind for lateral confinement, metal lath shows the best effect on spalling resistance, and glass fiber and carbon fiber do not show good effect on the spalling resistance due to reduction of bond strength by high temperature. While the residual compressive strength shows about 80% of its original strength in the specimen confined laterally by PP fiber contents and metal lath, it decreases a bit in the range of 50~60% of its original strength because of reduction of the bond strength.
현무암골재를 사용한 콘크리트의 초음파법 비파괴 시험에 의한 강도 평가
김상우,표대수,이백수,류현기,한천구 대한건축학회 2001 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.21 No.1
The objective of this study is to compare compressive strength and ultrasonic pulse velocity of concrete using basalt aggregate to that using granite aggregate. And is to provide the reference data on the standardization of nondestructive test of concrete. According to test results, compressive strength of concrete using basalt aggregate is highly estimated under the same ultrasonic pulse velocity comes to that using granite aggregate about 1.5-2times. It is urgently that new by suggested estimation formula of compressive strength using basalt aggregate must be prescribed because estimation formula of compressive strength of concrete using basalt aggregates overestimates the strength compared to that using granite aggregate.
슈미트 햄머법 비파괴 시험에 의한 현무암 골재를 사용한 콘크리트의 강도 평가
김상우 ( Kim¸ Sang-woo ),이백수 ( Li¸ Bai-shou ),이승석 ( Lee¸ Seung-seok ),류현기 ( Ryu¸ Hyun-ki ),한천구 ( Han¸ Cheon-goo ) 한국구조물진단유지관리공학회 2000 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.4 No.2
This paper is intended to provide the reference data on the standardization of nondestructive test of concrete using basalt aggregate produced in Cheju island. Compressive strength and rebound number of schmidt hammer are measured. Concrete using granite stone are also tested. According to experimental results, compressive strength of concrete using basalt aggregate is highly estimated compared to that using granite stone about 10~20% for same rebound number condition. It is urgently necessary to prescribe modified evaluation formular of compressive strength with schmidt hammer considering our condition because existing estimation formular provided in Japan underestimate the compressive strength of concrete using basalt aggregate.