재생굵은골재와 산업부산물을 사용한 재생콘크리트의 특성

성찬용,류능환 강원대학교 부설 석재복합신소재 제품연구센터 2004 석재연 논문집 Vol.9 No.-

The purpose of this study was to obtain the basic data for the development of block utilizing recycled aggregate and industrial by-product. The unit weight, compressive and flexural strength, ultrasonic pulse velocity, dynamic modulus of elasticity and durability factor were decreased with increasing the content of recycled coarse aggregate. But, the absorption ratio was increased with increasing the content of recycled aggregate. The unit weight was 2,237~2,307 kgf/㎥, the absorption ratio was 2,96~4.12%, the compressive strength was 415~532 kgf/㎠, the flexural strength was 75~96 kgf/㎠, the ultrasonic pulse velocity was 4,350~4,949m/s, the dynamic modulus of elasticity was 390×10³~465×10³ kgf/㎠ and the durability factor was more than 60 in the freezing and thawing 300 cycles. Accordingly, this recycled coarse aggregate can be used for high strength concrete and block manufacture. 본 연구는 재생굵은골재와 산업부산물을 활용한 블록을 개발하기 위하여 플라이 애시와 고로슬래그 미분말을 결합재 중량의 20%를 대체하고, 재생골재의 혼입율을 5종류로 하여 총 10종류의 콘크리트에 대하여 단위용적중량, 흡수율, 압축강도, 휨강도, 초음파진동속도, 동탄성계수 및 내구성 지수에 대하여 구명하였다. 단위용적중량, 압축강도, 휨강도, 초음파진동속도, 동탄성계수 및 내구성 지수는 재생골재의 사용량이 증가할수록 감소하는 경향을 나타내었고, 흡수율은 증가하는 경향을 나타내었다. 재생골재를 100%까지 사용하여도 압축강도는 415 kgf/㎠ 이상, 휨강도는 75 kgf/㎠ 이상, 내구성 지수는 60이상으로 나타나, 고강도 콘크리트 및 블록 제조에 활용이 가능할 것으로 생각된다.

폐석재와 석분을 사용한 식생블럭 제품 개발

성찬용,류능환,연규석,윤준노,김영익,남기성,노경희,박일순 강원대학교 부설 석재복합신소재 제품연구센터 2002 석재연 논문집 Vol.7 No.-

본 연구는 폐석재와 석분을 사용하여 친환경적인 식생블럭 제품을 개발하기 위하여 폐석재의 입경과 석분의 첨가량을 각각 3종류씩 총 9종류의 식생블럭에 대하여 단위중량, 공극율, 투수량, 압축강도, 쪼갬인장강도, 휨강도, 내산성, 알카리농도에 대하여 구명하였다. 단위중량, 강도, 내산성은 골재의 입경이 작을수록 석분의 혼입량이 많을수록 크게 나타났으며, 공극율과 투수량은 작게 나타났다. 강도는 중성화 처리 유무에 따라 4∼5% 정도의 미소한 차이가 나타났다. 알카리 농도는 중성화 약품처리, 수중용출, 야외폭로 순으로 효과가 크게 나타났으며, 이는 식생블럭의 중성화 방법 선택에 매우 중요한 내용이라 할 수 있다. 또한, 식생상태는 공극율과 골재의 입경이 큰 식생블럭이 생육에 유리한 것으로 나타났다. This study was performed to develop the environment-friendly plantable block and to evaluate unit weight, void ratio, permeability, strength, acid-resistance and value of pH by the change of the grading of waste stone and the addition amount of stone dust. The unit weight, strength, acid-resistance is increased with small size of waste stone with increase of the addition amount of stone dust. But, the void ratio and permeability is decreased. The strength of neutral plantable block is decreased approximately 4-5% than that of the normal plantable block. The decreased effect of pH increased in order to neutral treatment, underwater leaching and field exposure. It is very important contents in neutral method selection of plantable block. Also, the planting state is grown rapidly with increase of the void ratio and of the waste stone size, approximately.

동결(凍結)-융해작용(融解作用)이 흙의 강도특성(强度特性)에 미치는 영향(影響) (IV) - 단열재(斷熱材)를 삽입(揷入)한 동결성토(凍結盛土)의 단열거동(斷熱擧動) -

유능환 ( Ryu Neung Hwan ),박승범 ( Park Seung Bum ),유영선 ( Ryu Young Sun ) 한국농공학회 1990 韓國農工學會誌 : 전원과 자원 Vol.32 No.3

This paper was analized the thermal conductivity of polystylene (TENSAR- GEOGRID) embeding into the subbase through frost penetration depth, frost heave, change of bearing capacity, and soil moisture movement due to freezing, thawing and icing actions, and their results were as follows : 1. The change of temperature into the sub-base was much increased by the Tensar-Geogrid insertion, and the frost penetration and frost heave were decreased as the thinner of the insulation thickness but the thawing velocity of melting period was appeared to be faster in case of non-insulated. 2. The frost heave had a close relationship with the thickness of insulations which was reasonably included anti-frost effects. 3. The moisture content during the freezing period of upper layer of the insulation insertion was increased by 15 per cent but it was returned to initial state of the thawing period, and at the down layer temporarily increased by 10 per cent and returned to the original state at once. 4. The insulation was acted as a function of distribution of surcharge, and the settlement of the sub-base was about 1.5 mm under 15 tonnage of load and which was included within the allowable limits. 5. The sliding resistance due to the icing which was induced by the insulation insertion into the sub-base was appeared as more 40 per cent than noninsulation area, so that the insulations should be restricted on the place such as mountains, curved and cross area which were required the braking power under the traffics.

폴리머 모르터를 이용한 사면보호재의 개발

유능환 ( Ryu Neung Hwan ),연규석 ( Yeon Kyu Seok ),김기성 ( Kim Ki Sung ),지경용 ( Ji Kyung Yong ) 한국농공학회 1998 한국농공학회 학술대회초록집 Vol.1998 No.-

The objective of this study was to develop a polymer mortar defensive block with high strength and durability using unsaturated polyester resin to complement defects of conventional cement mortar defensive block. Physical and mechanical properties of the polymer mortar defensive block were also investigated. Low absorptivity, high impact strength, and great bending strength of the polymer mortar defensive block was compared with those of the conventional cement defensive block. In conclusion, the polymer mortar defensive block is excellent and useful as industrial products for erosion control works.

FRP보강 폴리머 모르터 패널의 역학적 특성

유능환 ( Ryu Neung Hwan ),연규석 ( Yeon Kyu Seok ),김기성 ( Kim Ki Sung ),이윤수 ( Lee Youn Soo ),최동순 ( Choi Dong Soon ) 한국농공학회 1999 한국농공학회 학술대회초록집 Vol.1999 No.-

This study was initiated to develop a precast polymer concrete panel production method and to describe some engineering properties of FRP(Fiberglass Reinforced Plastics) reinforced polymer mortar. Specimens with different panel thickness and FRP reinforcement were prepared and tested and analyzed with respect to structural behaviors. Cracking moment was mostly affected by the thickness and reinforced FRP. Data of the study could be widely applied to the designing and planning of production processes of many polymer concrete products of which all or some of the components are composed with thin panels.

기초지반(基礎地盤)의 지지력보강공법(支持力補强工法)에 관한 연구(硏究)

유능환 ( Ryu Neung Hwan ),최예환 ( Choi Ye Hwan ),유연택 ( Ryu Yean Taek ) 한국농공학회 1988 韓國農工學會誌 : 전원과 자원 Vol.30 No.1

This paper presented as follows results of laboratory model tests with various shaped footings on soil bed reinforced with the strips on the base of behaviour of soil structure according to the loads and triaxial test results reinforced with geotextiles. Their parameters studied were the effects on the bearing capacity of a footing of the first layer of reinforcement, horizontal and vertical spacing of layers, number of layers, tensile strength of reinforcement and iclination load to the vertical. 1. Depending on the strip arrangement, ultimate bearing capacity values could be more improved than unreinforced soil and the failure of soil was that the soil structure was transfered from the macrospace to microspase and its arrangement, from edge to edge to face to face. 2. The reinforcement was produced the reinforcing effects due to controlling the value of factor of one and permeable reinforcement was never a barrier of drainage condition. 3. Strength ratio was decreased as a linear shape according to increment of saturation degree of soil used even though at the lower strength ratio, the value of M-factor was rot influenced on the strength ratio but impermeable reinforcement decreased the strength of bearing capacity. 4. Ultimate bearing capacity under the plane-strain condition was appeared a little larger than triaxial or the other theoretical formulars and the circular footing more effective. 5. The maximum reinforcing effects were obtained at U / B=0.5, B / B=3 and N=3, when over that limit only acting as a anchor, and same strength of fabric appeared larger reinforcing effects compared to the thinner one. 6. As the LDR increased, more and more BCR occurred and there was appeared a block action below Z / B=0.5, but over the value, decrement of BCR was shown linear relation, and no effects above one. 7. The coefficient of the inclination was shown of minimum at the three layers of fabrics, but the value of H / B related to the ultimate load was decreased as increment of inclination degree, even though over the value of 4.5 there wasn't expected to the reinforcing effects As a consequence of the effects on load inclination, the degree of inclination of 15 per cent was decreased the bearing capacity of 70 per cent but improved the effects of 45 per cent through the insertion of geotextile.

화강암 풍화토의 동상 발현 및 융해에 따른 변형 거동에 관한 연구

류능환 ( Ryu Neung Hwan ),최중대 ( Choi Jung Dae ),류영선 ( Ryu Young Sun ) 한국농공학회 1995 韓國農工學會誌 : 전원과 자원 Vol.37 No.3

Natural ground is a composite consisted of the three phases of water, air and soil paircles. Among the three components, water as a material is well understood but soil particles are not in foundation engineering. Especially, weathered granite soil generally shows a large volumetric expansion when they freeze. And, the stability and durability of the soil have shown decreased with repetitive freezing and thawing processes. These unique charcteristics may cause various construction and management problems if the soil is used as a construction material and foundation layers. This project was initiated to investigate the soil's physical and engineering characteristics resulting from freezing and freezing-thawing processes. Research results may be used as a basic data in solving various problems related to the soil's unique characteristics. The following conclusions were obtained: The degree of decomposition of weathered granite soil in Kangwon-do was very different between the West and East sides of the divide of the Dae-Kwan Ryung. Soil particles distributed wide from very coarse to fine particles. Consistency could be predicted with a function of P₂₀₀ as LL=0.8 P₂₀₀+20. Permeability ranged from 10^-2 to 10^-4cm/sec, moisture content from 15 to 20% and maximum dry density from 1.55 to 1.73g /cm³ By compaction, soil particles easily crushed, D₅₀ of soil particles decreased and specific surface significantly increased. Shear characteristics varied wide depending on the disturbance of soil. Strain characteristics influenced the soil's dynamic behviour. Elastic failure mode was observed if strain was less than 10^-4/s and plastic failure mode was observed if strain was more than 10^-2/s. The elastic wave velocity in the soil rapidly increased if dry density became larger than 1.5g /cm³ and these values were V_p=250, V_g=150, respectively. Frost heave ratio was the highest around 0℃ and the maximum frost heave pressure was observed when deformation ratio was less than 10% which was the stability state of soil freezing. The state had no relation with frost depth. Over freezing process was observed when drainage or suction freezing process was undergone. Drainage freezing process was observed if freezing velocity was high under confined pressure and suction frost process was occurred if the velocity was low under the same confined process.

압밀특성(壓密特性)에 관(關)한 연구(硏究) (I) (선행하중(先行荷重)이 압밀특성(壓密特性)에 주는 영향(影響))

류능환 ( Neung Hwan Ryu ),강예묵 ( Yea Mook Kang ) 한국농공학회 1976 韓國農工學會誌 : 전원과 자원 Vol.18 No.4

The determination of the pre-consolidation load known to have a great effect on the consolidation characteristics of the soil have been researched and discussed in detail by many other researchers. A study was undertaken to investigate and compare the effect of pre-consolidation loads on the coefficient of permeability and the consolidation characterisics of soil through the consolidation test on the three types of soil samples. The results of this study are follows; 1. Large compression index is dependent on initial void ratio of the sample being used and the pressure-void ratio curve shows a curved linear relationship in over-consolidated area but a linear relationship in normally consolidated area. 2. Settlement-time curve is S-shaped where the pressure is larger than pre-consolidation load and regardless of over-burden pressure, it is a similar straight line respectively in the secondary consolidation area. 3. Primary consolidation ratio of the sample increases almost linearly with the increase of over-burden pressure but the coefficient of volume compressibility decreases linearly with the increase of it. 4. Time factor of a certain degree of consolidation increases with over-burden pressure but the coefficient of consolidation decreases with it in over-consolidated area. There is a linear relationship between them in normally consolidated area. 5. The void ratio of completion point of primary consolidation decreases linearly with over-burden pressure. 6. The coefficient of permeability of sample decreases linearly with over-burden pressure in normally consolidated area, also it increases linearly with increment of the void ratio of the sample.

섬진강하구유역의 충적점토에 (沖積粘土) 대한 토질공학적 특성연구 (1)

유능환(Neung Hwan Ryu),유연택(Yean Taek Ryu),박승범(Seung Beom Park) 한국지반공학회 1988 대한토질공학회지 Vol.4 No.1

동결토의 압축강도에 관한 실험적 연구 (2)

류능환(Neung Hwan Ryu) 강원대학교 농업과학연구소 1995 강원 농업생명환경연구 Vol.6 No.-