• Title/Summary/Keyword: Fills

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A Study on the Development of Flowable Fill Materials for H-pile (가시설 H-pile의 유동화 채움재 개발)

  • Jeong, Won-Jeong;Im, Jong-Chul;Kim, Tae-Hyo;Joo, In-Gon;Kang, Hyun-Woo
    • Journal of the Korean GEO-environmental Society
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    • v.12 no.8
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    • pp.39-50
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    • 2011
  • Nowadays, H-piles are usually used as temporary retaining walls, and sometimes buried in the ground after construction. The purpose of this study is the development of flowable fill materials that are easy to fill holes of retaining wall structure and minimize friction during pulling out H-pile. The first test was performed to decide mix proportion that is reasonable for purpose, in the second test, direct shear test was performed to get pullout resistance between flowable fills material and H-pile, and one dimensional consolidation test was performed to analyze the compressibility. In the test result, it showed that flowable fill material mix proportion is 350-450% of water, 70-100% of cement and 70-100% of sand based on the bentonite weight.

Cooling Tower Overhaul of Secondary Cooling System in HANARO (하나로 2 차 냉각탑의 공장분해수리)

  • Park, Young-Chul;Lee, Young-Sub;Kim, Yang-Gon;Jung, Hoan-Sung;Lim, In-Chul
    • Proceedings of the KSME Conference
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    • 2007.05b
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    • pp.2714-2719
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    • 2007
  • HANARO, an open-tank-in-pool type research reactor of 30 MWth power in Korea, has been operating normally since its initial criticality in February, 1995. For the last about ten years, A cooling tower of a secondary cooling system has been operated normally in HANARO. Last year, the cooling tower has been overhauled for preservative maintenance including fills, eliminators, wood support, water distribution system, motors, driving shafts, gear reducers, basements, blades and etc. This paper describes the results of the overhaul. As results, it is confirmed that the cooling tower maintains a good operability through a filed test. And a cooling capability will be tested when a wet bulb temperature is maintained about 28 $^{\circ}C$ in summer and the reactor is operated with the full power.

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A Novel Technoque for Characterization of Membranes

  • Webber, Ronald;Jena, Akshaya;Gupta, Krishna
    • Proceedings of the Membrane Society of Korea Conference
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    • 2001.10a
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    • pp.39-50
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    • 2001
  • The performance of membranes is governed their pore struture. Pore structures of porous materials can be determined by a number of techniques. However, The novel technique, capillary folw porometry has a number of advantages. In this technique, the sample is brought in contact with a liquid that fills the pores in the membrane spontaneously. Gas under pressure is used to force the liquid from the pores and increase gas flow. Gas flow rate measured as a function of gas pressure in wet and dry samples yield data on the largest pore size, the mean flow pore size, flow distribution and permeability. Pore characteristics of a number of membranes were measured using this technique. This technique did not require the use of any toxic material and the pressure employed was low. Capillary flow porometry is a suitable technique for measurement of the pore structure of many membranes.

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Fuzzy logic based estimation of effective lengths of columns in partially braced multi-storey frames

  • Menon, Devdas
    • Structural Engineering and Mechanics
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    • v.11 no.3
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    • pp.287-299
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    • 2001
  • Columns in multi-storey frames are presently categorised as either braced or unbraced, usually by means of the stability index criterion, for estimating their effective length ratios by design aids such as 'alignment charts'. This procedure, however, ignores the transition in buckling behaviour between the braced condition and the unbraced one. Hence, this results in either an overestimation or an underestimation of effective length estimates of columns in frames that are in fact 'partially braced'. It is shown in this paper that the transitional behaviour is gradual, and can be approximately modelled by means of a 'fuzzy logic' based technique. The proposed technique is simple and intuitively agreeable. It fills the existing gap between the braced and unbraced conditions in present codal provisions.

Standard Architecture of Information Systems for Virtual Construction (가상건설 정보시스템 통합을 위한 표준 아키텍처)

  • Han, Shocky
    • Proceedings of the Computational Structural Engineering Institute Conference
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    • 2008.04a
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    • pp.247-252
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    • 2008
  • Systems architecture of information models for construction industry is introduced. The architecture ful fills international standards, such as ISO 10303(STEP) and IAI IFC, etc. It is defined in web service description language(WSDL) and ISO 10303-11(EXPRESS) language. A standard platform for this standard architecture is also developed. This platform has several tools which can transform EXPRESS description file into C++ or Java languages and which also can generate an IDL file or OWL file from an EXPRESS file. System architects, software engineers, information system consultants can use these standards to define their information model for construction industry in standardized way. Construction engineers can test this information model with ease using standard testing tools and testing method, which is also a part of standard architecture of information systems for virtual construction.

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Curtain Wall Façades on the New Generation of Supertall Buildings Present and Future Directions

  • Oh, Sae Hwang
    • International Journal of High-Rise Buildings
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    • v.9 no.2
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    • pp.113-125
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    • 2020
  • Beginning in the late 19th century, construction of skyscrapers spread throughout Chicago, New York City, and then the world as demand of space in buildings and increase of cost of land. With this change curtain wall systems have evolved to be more visually complex; these unique profiles of the skyscraper became powerful images and symbols of our cities. A curtain wall is defined as usually aluminum-framed wall containing in-fills of glass and metal panels. The framing is attached to the building structure and does not carry the floor or roof loads of the building.

3D Printing Based Patient-specific Orbital Implant Design and Production by Using A Depth Image (깊이 영상을 이용한 3D 프린팅 기반 환자 맞춤형 안와 임플란트의 설계 및 제작)

  • Seo, Udeok;Kim, Ku-Jin
    • Journal of Korea Multimedia Society
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    • v.23 no.8
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    • pp.903-914
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    • 2020
  • In this paper, we present a novel algorithm to generate a 3D model of patient-specific orbital implant, which is finally produced by the 3D printer. Given CT (computed tomography) scan data of the defective orbital wall or floor, we compose the depth image of the defect site by using the depth buffering, which is a computer graphics technology. From the depth image, we compute the 3D surface which fills the broken part by interpolating the points around the broken part. By thickening the 3D surface, we get the 3D volume mesh of the orbital implant. Our algorithm generates the patient-specific orbital implant whose shape is accurately coincident to the broken part of the orbit. It provides the significant time efficiency for manufacturing the implant with supporting high user convenience.

TWO CASES OF LARGE ODONTOGENIC KERATOCYST(OKC) IN THE MANDIBLE (하악골에 광범위하게 발생한 치성각화낭종 2례)

  • Shim, Kwang-Sup
    • Maxillofacial Plastic and Reconstructive Surgery
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    • v.18 no.2
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    • pp.279-285
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    • 1996
  • The odontogenic keratocyst(OKC) was used of term and described some of clinical, radiological and microscopic features by Philipsen 1956. The microscopic finding of OKC is characterized by the production of keratin, Which sometimes fills the lumen and thinning of epithelium of cyst. The most clinical importance of OKC is its extraordinary recurrence rate owing to the incomplete removal of the cyst wall. The final diagnosis of OKC should be evaluated by histologic findings and follow-up of any case of OKC with annual roentgenograms and clinical evaluations is essential for at least five years after surgery. This article is report of 2 cases of large OKC involved both molar portion and symphysis of mandible with facial asymmetry, severe bone destruction and paresthesia of lower lip on clinically, roentgenographically. By the postoperative findings the patients showed normal regeneration of bone defect area without recurrence signs by panorama films after surgery.

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A Study on the Improvement of Discharge Capacity of Natural Fiber Drain (천연마섬유배수재의 통수능력 향상에 관한 연구)

  • 김지용;한상재;강민수;김수삼
    • Proceedings of the Korean Geotechical Society Conference
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    • 1999.10a
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    • pp.279-284
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    • 1999
  • Fiber drain(FD), which is made of organic fibers from jute and coir, has recently been used in several construction projects in the Southeast and East Asia region involving the soil improvement of reclamation fills overlying marine clay. FD is an environmentally friendly product that will naturally be biodegraded into soil after the completion of performance duration as a vertical drain. However, the conventional FD has limited and low-ranged discharge capacity compared to PVD. For this, in this study, the improvement of FD was attempted and new shaped FDs were evaluated by laboratory tests. A series of discharge capacity test was performed to investigate the functional applicability for several types of FDs.

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An Experimental Study on the Ultra High Strength Concrete Using Silica-Fume and Fly-Ash (실리카흄 및 플라이애쉬를 사용한 초고강도 콘크리트에 관한 실험적 연구)

  • 박기철;정헌수
    • Proceedings of the Korea Concrete Institute Conference
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    • 1991.04a
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    • pp.23-28
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    • 1991
  • Silica-Fume, an industrial by product, has an extremely small average partical size of 0.1${\mu}{\textrm}{m}$ and when used as a concrete admixture fills the fine voids which exist in concrete. The purpose of this study is to investigate material properties of the high-strength concrete using Silica-Fume and Fly-Ash. The main variables studied are; a) water-cement ratio. b) Silica-Fume, Fly-Ash content. The maximum compressive strength of 1000Kg/$\textrm{cm}^2$ is achieved with a mix using 18% water-cement ratio, 20% Silica-Fume and 10% Fly-Ash ratio.

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