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골재의 온도 변화에 따른 저발열 포틀랜드 시멘트 콘크리트의 특성
조용진,박광수,신수균,원종필,Cho, Yong-Chin,Park, Kwang-Su,Shin, Su-Gyun,Won, Jong-Pil 한국농공학회 2004 한국농공학회논문집 Vol.46 No.4
Properties of concrete using low heat portland cement is different from using ordinary portland cement and temperature of aggregate can be expected to have an important influence on its properties. In this study, experiment by setting up 5 levels (40, 30, 20, 4, $-2^{\circ}C$) by temperature of aggregate for evaluation properties of concrete using low heat portland cement was conducted. The experiments include slump test, air content test, change of slump, change of air content and compressive strength of concrete test. As the result of experiments, slump and air content was decreased by increasing temperature of aggregate. But it was not exceeding it's limit. Change of slump and air content was rapidly decrease by decreasing temperature of aggregate. At early age, compressive strength was influenced by the temperature of aggregate.
굵은골재의 편장석 함유량이 콘크리트의 성능에 미치는 영향
원종필,조용진,박광수,신수균,Won , Jong-Pil,Cho, Yong-Chin,Park , Kwang-Su,Shin , Su-Gyun 한국농공학회 2004 한국농공학회논문집 Vol.46 No.2
Generally, the properties of aggregate greatly affect the physical and mechanical properties of concrete. Flat and elongated particles in coarse aggregates, for some construction uses, may interfere with consolidation and be difficult to place. In this study, an experiment to evaluate properties of flat and elongated particles as coarse aggregate in concrete was conducted. The experiments include slump test, air content test and compressive strength test. The test result of slump and change of slump was rapidly decreased by percentage of flat and elongated particles. But it had not a trend by increasing percentage of flat and elongated particles. Compressive strength of hardened concrete does not make any differences in comparison.
폴리머 콘크리트를 이용한 조립식 수로구조물 표준도 개발
박광수 ( Park Kwang Soo ),신수균 ( Shin Su Gyun ),김관호 ( Kim Kwan Ho ),김명원 ( Lee Meyong Won ),이준구 ( Lee Joon Gu ) 한국농공학회 2002 한국농공학회 학술대회초록집 Vol.2002 No.-
This study was developed high-quality a large size precast channel structure using polymer concrete to improve quality of the product as well as to enhance construction quality. Practical precast channel structure design and manufacture procedure for the high polymer concrete were described in this paper. Precast PC represent the fastest growing segment of the polymer concrete industry. The fast curing, high strength, and low impermeability permit thin section and rapid reuse of moulds. Precast channel structure will carry out structural experiment and analysis.
박광수 ( Park Kwang Soo ),신수균 ( Shin Su Gyun ),박미현 ( Park Mi Hyun ) 한국농공학회 2001 한국농공학회 학술대회초록집 Vol.2001 No.-
The majority of important structures are made of concrete. Recently earth canals have increasingly been changed to concrete-based irrigation structures every year for higher efficiency of water conveyance and easier maintenance. Unfortunately these concrete structures for agricultural purpose have serviced to only 15-20 years, which amounts to only about one third of target service life and will finally result in natural resources waste and weakening of competitive power of agriculture and farmers. Moreover, recently increased concerns of phil-environment have required reconsideration of the roles, shapes, service lives of the irrigation structures. Hereby, this study is presented to find out suggestions or comments on the solutions to the problems of shorter service life and the resultant environmental impact encountered recently in the hydraulic structures for the prosperity of farmers, agriculture and this country.
박광수 ( Park Kwang Su ),신수균 ( Shin Su Kyun ),김관호 ( Kim Kwan Ho ),이준구 ( Lee Joon Gu ),김명원 ( Kim Meyong Won ),장단금 ( Jang Dan Gum ) 한국농공학회 2003 한국농공학회 학술대회초록집 Vol.2003 No.-
The actual quality of the concrete in the structure for Irrigation may differ from that represented by the cylinders because the age, consolidation, or curing of the in-place material may not be well represented by the standard test specimens. The objective of this paper is to offer a base data of specification is the best fit the ready-mixed concrete strength to the specified, and to address this deficiency, so that the strength information of the concrete in the structure for Irrigation can be rationally accounted for in the assessment of the quality condition of this. The strength of concrete in the hydraulic structures is checked using strength of core obtained from that, and 28-day-old cylinder strength is analyzed using cylinder data of the ready-mixed concrete.
콘크리트의 사용연한에 따른 중성화의 진행에 관한 실험적 연구
이준구 ( Lee Joon Gu ),박광수 ( Park Kwang Soo ),신수균 ( Shin Su Gyun ),김관호 ( Kim Kwan Ho ),박미현 ( Park Mi Hyun ) 한국농공학회 2001 한국농공학회 학술대회초록집 Vol.2001 No.-
This study was performed to find out variation of carbonation progress of agricultural hydraulic concrete structures along the used years with using Thermo Gravimetric analysis/Differential Thermal Analysis(TGIDTA) and Indicator(phenolphthalein). In this study some conclusions such as follows were derived. Firstly, The result that the age of structures and the content of Ca(OH)<sub>2</sub> and CaCO<sub>3</sub> in concrete have proportional relationships was found in the method of TGIDT A. This relational functions could be used to estimate remain lifetime of structures, obtaining the limits of the content of CaCO<sub>3</sub> in concrete which reinforcement corrosion could be occurred with breaking protection cover of alkalinity. Second, if the result of strength, voids, permeability characteristics could be combined with this relational function this may be able to be used as a new more accurate assessment technique for the quality of concrete than current usual methods. Third, environmental affect could be more superintendent for concrete carbonation than the age of agricultural hydration structures. Forth, It is difficult to estimate the used year of agricultural hydraulic concrete structures with the carbonation depth measured by indicator method. Finally, the accuracy of this relational function could be decided to be upgraded with continue analysis for more structures.
김중규 ( Kim Jung-kyu ),김현영 ( Kim Hyun-yong ),문세동 ( Moon Se-dong ),신수균 ( Shin Su-gyun ) 한국농공학회 2005 한국농공학회 학술대회초록집 Vol.2005 No.-
All these days, we achieved the result of our efforts on agricultural facilities by a huge budget for stable agricultural infrastructure development. But it is anticipated that the cost of maintenance is increased from now on since we've focused on installing facilities(agricultural infrastructures) in quantity more than in quality. Furthermore we are short of efficient management system(S/W) because of active and overall support for facilities expansion(H/W). This study is focus on how to improve our agricultural infrastructure for not only to maintain eco-friendly facilities but also to prepare water shortage era.
촉진양생조건에 따른 PC 콘크리트의 품질 특성에 관한 연구
김관호 ( Kim Kwan Ho ),박광수 ( Park Kwang Soo ),신수균 ( Shin Su Gyun ),이준구 ( Lee Joon Gu ) 한국농공학회 2001 한국농공학회 학술대회초록집 Vol.2001 No.-
Annual demand of a precast concrete bench flume used in the irrigation canal of arable land readjustment has continuously increased units recently. The average life time of the precast concrete bench flume was estimated 8 ~ 10 years, which is too shorter than the life time of in-site placed concrete structures. In order to increase the compressive strength of the precast concrete bench flumes, the highest temperature of being lower than 95℃ was suggested in this study. Through analyzing the relation between the compressive strength and the amount of chloride penetration into concrete specimens, a new formula early estimating durability of the concrete structure was suggested.
이준구 ( Lee Joon Gu ),박광수 ( Park Kwang Soo ),신수균 ( Shin Su Gyun ),김관호 ( Kim Kwan Ho ),김한중 ( Kim Han Joung ) 한국농공학회 2002 한국농공학회 학술대회초록집 Vol.2002 No.-
This study was performed to find out the regression function to calculate the modulus of elasticity of concrete mixed by river coarse aggregate. The distribution of the group of core strength made a normal curve and the effect factor in the modulus of elasticity was 0.97 at the concrete compounded by river coarse aggregate.