• 아시안잔디학회지
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• 제16권1호
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• pp.19-30
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• 2002

경직된 지반의 물리성 개선재로서 rubber chip의 토양 내 혼합 또는 배토는 잔디의 생육과 지반의 이·화학성 및 중금속 추출 실험을 통하여 다음과 같은 결론을 얻었다. Rubber chip의 토양 내 혼합은 지면의 온도 상승효과를 가져왔으며 이는 겨울철의 동해방지 및 맹아출현기를 앞당길 수 있을 것이라 추정된다. 그러나 복사열이 높은 여름에는 rubber chip에 의한 표면, 지중 온도의 상승으로 잔디의 피해가 우려된다. 또한 토양 내에 rubber chip의 혼합함량(rubber chip 20%, 40%)이 많을수록 잔디의 발아와 생육 및 피복에 부정적인 영향을 끼쳤다. Rubberchip의 토양혼합은 지반의 이·화학성 변화에 크게 작용하지 않았으며 중금속 추출실험에서도 차이를 나타내지 않아 토양환경 오염이 없을 것으로 판단된다. Rubber chip을 배토용 재료로서 사용했을 경우, 경직된 토양구조를 개선시켜 주었다. 특히 통기작업 후 rubber chip의 배토는 지반의 표면탄성을 현저히 완화시켰다. 따라서 현재 우리나라에서 보수중이 거나 건설중인 연습구장, 보조구장에 재활용이 가능한 폐타이어 rubber chip을 지반 답압 개선용, 배토용 재료로서 사용이 가능할 것으로 판단된다.

• Journal of the Korean Wood Science and Technology
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• 제26권1호
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• pp.70-75
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• 1998

In this paper, the relationships between volumetric mixing ratio of rubber chip and physical and mechanical properties of wood/rubber composite panel was examined in order to investigate the mixture characteristics of wood and rubber chip. Because of the specific gravity of rubber differed from wood chip, physical properties of wood/rubber composite panel was shown very different values by mixing rate of chip element. Specific gravity in air-dry of composite panel was increased rapidly as volumetric percent of rubber chip was increased. Moisture content of composite panel was decreased as volumetric percent of rubber chip element was increased. This results was considered that wood weight is light and porosity material for moisture absorption. Compressive strength and modulus of rupture in bending test were decreased as volumetric percent of rubber chip increased. By mixing ratio control of chip elements, various wood/rubber composite panel can be applicable to every interior materials such as subfloor, playground, and exterior materials such as road blocks for recreational facilities in garden and forest and city parks.

• 한국환경복원기술학회지
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• 제15권4호
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• pp.97-109
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• 2012

In this study this writer carried out survey and analysis on paving materials of children's playground for 40 apartment buildings with each of such apartment containing 100 households or more and which were built within last 15 years in Jeonju. As a result of analysis of such questionnaires this author could draw following conclusion. In the second half of 1990s pavement materials which were used mainly were sand and during first half of 2000s they were mixture of sand and rubber block and around 2010 they were rubber block or rubber chip pavements. Such change seemed to be a result of consideration of convenience for management and safety rather than in deference to diversity of children's outing places. Survey on the current status of pavement materials revealed need for directives by the main entity for management and their firm resolve for its implementation. And there was need for their coping with problems such as pressure of treading or lack of it or poor condition of drainage in case of sand and phenomena of pitting or dipping down, discoloring and poor drainage in case of rubber chips and rubber blocks and loosening of gaps between rubber blocks etc. Result of analysing status of usage disclosed that 50.4% of the respondents to questionnaires stated that they had experience of accidents. With regard to cause of such accident it was found that 47.5% of accidents were attributable to play facilities and 19.5% were due to paving (floor) materials thus it was disclosed that not only play facilities but also pavement materials had impact on safety for the children. Result of analysing level of satisfaction with pavement materials showed that pavement by rubber chips and blocks had higher level of satisfaction which was reflection of fear on cleanness of sand. In terms of preference rubber chip and rubber block pavements were highest and the next one was sand. Reason for such preference was based on concern with safety.

• 한국지반공학회논문집
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• 제40권4호
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• pp.7-18
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• 2024

자체 광물 특성에 의해 타이어칩은 모래와 같은 천연 지반재료에 비해 매우 낮은 열전도도를 가지므로 모래-타이어칩 혼합토는 단열재료로써 활용될 수 있다. 하지만 모래-타이어칩 혼합토에 대한 기존 열전도도 연구는 제한적이었다. 따라서 본 연구에서는 포화도에 따라 다양한 입경크기 비율을 가진 모래-타이어칩 혼합토의 열전도도 변화를 조사하였다. 단열 처리된 셀에 시료를 조성하였으며, 탐침법을 이용하여 열전도도 실험을 수행하였다. 또한 본 연구는 혼합토의 접촉각 측정을 수행하였다. 그 결과 타이어칩 함량이 낮아질수록, 포화도가 증가할수록 열전도도가 증가함을 확인했다. 하지만 타이어칩 함량에 따라 혼합토의 포화도에 따른 열전도도 증가 경향은 달라졌으며, 특히 타이어칩 함량이 40% 이상인 시료의 경우 포화도가 증가함에도 불구하고 열전도도는 지연 증가하였다. 이는 소수성 입자(타이어칩)가 함수비 증가에 따른 추가적인 열전도 경로인 capillary water bridge 형성을 지연시키고, 이로 인해 포화도에 대한 혼합토의 열전도도 의존성이 변화하였기 때문이다.

• Journal of the Korean Wood Science and Technology
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• 제25권4호
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• pp.29-38
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• 1997

The effect and control of wood property of reconstituted composite panels for improved board properties by wood-waste materials and development of combination method for heterogeneous materials have been of interest to the wood science researchers. The purpose of this study is to consider the properties in relation to hot pressing conditions and to develope the optimum hot pressing condition with waste wood and waste tire for the manufacturing of composite boards. The study of composite boards for recycling of wood and waste tire is nothing up to the present. Physical and mechanical properties such as specific gravity, moisture content, swelling coefficient, modulus of rupture and modulus of elasticity in bending test were studied. The condition of 3-stage press time for the lowest moisture content of composite board was $4{\rightarrow}3{\rightarrow}3$ minutes. Specific gravity of composite panels was affected mainly by the amount of rubber chip. Because of the low rigidity and high elasticity in rubber chip, it is considered the composite panel was adequate material in the place of compression load, but not bending load. Therefore, it was concluded that a use of rubber-based wood composite panel is proper to the interior materials such as floor a room than exterior materials. From the test results, the most optimum hot pressing conditions were $4{\rightarrow}3{\rightarrow}3$ minutes for 3-stage press time and $45{\rightarrow}20{\rightarrow}5kg/cm^2$ for 3-stage press pressure. The rubber-based wood composite panel was very excellent in elasticity by combination of rubber chip in comparison with existing other wood-based materials. Therefore, it was considered that rubber-based wood composites can be applicable to every interior materials such as floor a room and will be expected to effective reuse and recycle of waste tires and wood-waste materials, and will be contribute to protection of environment pollution in earth.

• 한국안전학회지
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• 제30권1호
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• pp.66-71
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• 2015

Safety, resilience and comfort of pedestrian were assessed by the British Pendulum Test and SB/GB factor test at 8 kinds of sidewalk pavement. Sidewalk paving materials were normal concrete, porous concrete, concrete block, soil concrete, asphalt, rubber chip/resin mixture, wood chip/resin mixture and floor tile. In addition, a survey was conducted to investigate the perception of pedestrians on the sidewalk paving material. As a result, while the skid resistance value was measured in the most 60BPN above, the floor tile showed a low value of about 30BPN. The ratios of SB factor to GB factor of the elastic pavements(rubber/resin mixture and wood chip/resin mixture) appeared to be relatively large when compared with those of the conventional sidewalks. The survey showed that respondents perceived as more safe and comfortable elastic pavements compared to conventional pavements. Approximately 50% of respondents answered that hardened soil pavement was the most environmentally friendly.

• Elastomers and Composites
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• 제33권1호
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• pp.44-51
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• 1998

The purpose of this experiments were investigated on the physical properties of rubber com-pounds containing two types carbon black. Bound rubber and interaction coefficient for com-pounds with pure carbon black were higher than those for the compounds with dual phase carbon black. Slightly higher values in 300% modulus and tensile strength indicated that the ratio of rubber-filler bound to rubber-rubber bound of pure carbon black were higher than those of com-pounds with dual phase carbon black. It was founded that dynamic properties, that is rebound, heat build-up, 0 & $60^{\circ}C$ tan $\delta$, and cut and chip loss of compounds with dual phase carbon black were better than those of compounds with pure carbon black, but abrasion property of dual phase carbon black was lower than those of pure carbon black because of low reinforcing ability.

• Elastomers and Composites
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• 제32권1호
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• pp.20-28
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• 1997

This study have Investigated the effect of various factors related to the physical properties of vulcanizated rubber compounds. rubber type, carbon black type and carbon black loading were selected as main factors and evaluation were tested by tables of orthogonal arrays with 3 factors and 3 levels. rubber types have affected cure time, tensile strength, and $T_g$ as main factor and carbon black loading have affected viscosity, scorch time, maximum torque, hardness, 300% modulus, rebound, heat build-up, $0\;&\;60^{\circ}C$ tangent delta, PICO and CUT/CHIP loss as main factor but the effects of carbon black type have affected only bound rubber content.

• Elastomers and Composites
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• 제41권2호
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• pp.79-87
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• 2006

내소음성과 내균열성을 가진 고무재료의 개발을 목적으로 NBR에 oleamide와 아라미드를 첨가하여 함량에 따른 가황특성, 물리적 성질, 내열성, 내유성, 내마모성, 내균열성 및 내소음성을 조사하였다. 가황특성과 Mooney 점도를 측정한 결과, 미가황고무의 가황특성은 oleamide의 양이 증가할수록 torque가 감소하였다. oleamide의 함량이 3 phr까지 증가함에 따라 경도 및 모듈러스 값은 조금씩 감소하였고 신장률은 감소하는 경향을 나타내었으며 인장강도는 거의 변화가 없었다. 내열성 시험(70시간, $120^{\circ}C$) 및 내유성 시험(70시간, $40^{\circ}C$)을 수행한 결과. 인장강도와 신장률이 모두 감소하였으며, TGA/DSC 분석 결과 첨가제에 따른 배합고무재료의 열적특성은 변화가 없었다. 기본물성, 내마모성, 내소음성 및 내균열성을 종합한 결과, NBR 227001 고무재료에서 내마모성과 내소음성에 대한 oleamide의 최적배합비는 3 phr였으며, 내균열성에 대한 아라미드의 최적배합비는 1 phr로 나타났다.

• 한국소음진동공학회논문집
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• 제21권8호
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• pp.768-773
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• 2011

This work presents an experimental investigation on vibration control of the active hybrid mount system for naval ships. To reduce unwanted vibrations, this paper proposes an active mount which consists of rubber element, piezostack actuator and inertial mass. The rubber element supports a mass. The piezostack actuator generates a proper control force and supply it to the mount system. To avoid being broken piezostack actuator, an actuator of the proposed mount is devised as an inertial type, in which a piezostack actuator is positioned between inertial mass and rubber element. Vibration control performances of the active mount system are evaluated via experiment. To attenuate the unwanted vibrations transferred from upper mass, the feedforward control is designed. In order to implement a control experiment, the active mount system supported by four active mounts is constructed. For realization of the controller, one-chip board is manufactured and utilized. Subsequently, vibration control performances of the proposed active mount system are experimentally evaluated in frequency domains.