http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
원종필 ( Won Jong Pil ),박찬기 ( Park Chan Gi ) 한국농공학회 1999 한국농공학회 학술대회초록집 Vol.1999 No.-
This study has been performed to obtain the mechanical properties of specialty cellulose fiber reinforced concrete. Flexural test is proceeded by third-point loading method and the size of the test specimens is 15 x 15 x 55mm. The effects of differing volume fraction(0.08%, 0.1%, 0.15%) were studied. The results of tests of the specialty cellulose fiber reinforced concrete were compared with plain and polypropylene fiber reinforced concrete. Results indicated that specialty cellulose fiber reinforcement showed an ability to increase the flexural strength.
원종필 ( Won Jong Pil ),배동인 ( Bae Dong In ) 한국농공학회 2000 한국농공학회 학술대회초록집 Vol.2000 No.-
Mechanical and physical properties of wood fiber for the reinforcement of thin-sheet cement products were investigated. The slurry-dewatering method followed by pressing was used to manufacture the products. Mechanical and physical properties of wood fiber reinforced cement composites were assessed with flexural strength, density, and water absorption. The results obtained in this study were analyzed statistically using the analysis of variance in order to derive statistically reliable conclusions.
원종필 ( Won Jong Pil ),황금식 ( Hwang Keum Sic ),윤종환 ( Yoon Jong Hwan ),장필성 ( Jang Pil Sung ),김명균 ( Kim Myung Koun ) 한국농공학회 2003 한국농공학회 학술대회초록집 Vol.2003 No.-
Plastic shrinkage cracking occurs at the exposed surfaces of freshly placed concrete due to consolidation of the concrete mass and rapid evaporation of water from the surface. This so-called shrinkage cracking is a major concern for concrete, especially for flat structural such as pavement, slabs for industrial factories and walls. This study has been performed to obtain the plastic shrinkage properties of hydrophilic fiber reinforced mortar and concrete. The results of tests of the hydrophilic fibers were compared with plain and polypropylene fibers. Test results indicated that hydrophilic poly vinylalcohol fiber reinforcement showed an ability to reduce the total crack area and maximum crack width significantly( as compared to plain and polypropylene fiber reinforcement).
원종필 ( Won Jong-pil ),권연성 ( Kwon Youn-sung ),이찬민 ( Lee Chan-min ),김완영 ( Kim Wan-yong ) 한국농공학회 2002 한국농공학회 학술대회초록집 Vol.2002 No.-
The purpose of this research was to evaluate on the properties of fresh and hardened high-performance concrete(HPC) incorporating high-reactivity metakaolin(HRM). Setting time, heat of hydration, compressive strength, resistance to chloride-ion penetration, and repeated freezing and thawing test were carried out in order to investigate the properties of fresh and hardened state concrete. The properties of the HRM concrete were also compared with those of the portland cement concrete and silica fume(SF) concrete. The laboratory test results indicate that HRM material can be used as a supplementary cementitious material to produce high-performance concrete.
Bottom ash를 사용한 저강도 고유동 충전재의 강도특성
원종필 ( Won Jong Pil ),이용수 ( Lee Yong Su ) 한국농공학회 2001 한국농공학회 학술대회초록집 Vol.2001 No.-
This research was undertaken on the use of bottom ash as a fine aggregate in Controlled Low-strength Material(CLSM). The mixtures contained constant fly ash. And four different level of bottom ash with fly ash contents, 25 %, 50 %, 75%, 100 % are investigated. Mixture proportions were developed for producing CLSM at three 28-day strength levels: removal with tools (less than 7 kgf/cm<sup>2</sup>), removal by mechanical means (less than 200 kgf/cm<sup>2</sup>) and removal with power equipment (less than 83 kgf/cm<sup>2</sup>). To obtain these strengths, cement contents of 30, 60, and 120 kg/m<sup>3</sup> were utilized. The compressive strength properties support the concept that by-product bottom ash can be successfully used in CLSM.