• Title/Summary/Keyword: construction materials.

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A Study on the Development of Construction Production Rates System for Estimating Proper Construction Expenses of Off-Site Construction (OSC) Based PC Structure Factory-Built Assembly (OSC기반 PC구조 공장제작 적정 공사비 산정을 위한 품셈체계 개발 연구)

  • Lee, Jeongwook;Lee, Hansoo;Lee, Chiho;Noh, Hyunseok
    • Korean Journal of Construction Engineering and Management
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    • v.23 no.6
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    • pp.89-100
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    • 2022
  • The development of the Construction Production Rates System for appropriate construction cost calculation has recently come to the fore as a means of invigorating OSC based PC structure which currently needs institutional frameworks. PC structure based construction expenses consist of the factory-built assembly, transportation and on-site installation. Recently, in the field of transportation and site installation, research on product structure development is being conducted, such as presenting the standard product calculation system reflecting the results of field survey for each subsidiary materials (Lee et al., 2021). On the other hand, there is no ongoing research on estimating construction expenses of Factory-built assembly. This study suggests Construction Production Rates System which can be used for PC subsidiary materials based Factory-built assembly cost estimations. For the research, work types for the construction procedures have been categorized, and the standard input manpower suitable for the corresponding work characteristics has been derived from analyzing the associated Construction Standard Production Rates for each work type. Also, as the research referred PC subsidiary materials (such as columns, beams, walls, and slab, as well as on-site installation) and the standard number of workforce based on work types, one can calculate direct labor cost, using what the research shows. In addition, it suggests that the size of individual subsidiary materials be the extra cost factor, by using the characteristics that productivity changes depending on the size(m3) of subsidiary materials. It is expected that the research can contribute to objectively verifying factory-built assembly cost through of PC structure, which currently relies on estimates.

Development of 3D Printing Cement Based Composite Materials Applying for Exterior Finishing Material (건물 외장재 적용을 위한 3D 프린팅 시멘트 베이스 결합재 개발)

  • Shin, Hyeon-Uk;Song, Hun
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2018.05a
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    • pp.83-84
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    • 2018
  • 3D printing technology can be applied to various industries, and is trapped by major technologies that change existing manufacturing processes. 3D printing materials must satisfy designability, economy and productivity, and building materials are required to have strength and economy secured technology. 3D printing technology of construction field can be divided into structural materials and internal and external materials, and is mainly done by extruding and adapting. Particularly when it is applied as an exterior materials, it is mainly applied to an unstructured exterior materials and high accuracy is required. The exterior materials can be used as a cement composite materials, it is suitable also for a lamination type, and the role of a cement base bonding material is important. In this research, we developed a cementitious base binder applicable as a 3D printing exterior materials, confirmed density and strength characteristics for application as an exterior materials, a flame retardancy test for improving the fire resistance of buildings and confirmed its possibility.

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High Temperature Compressive Strength of Polymer Cement Composite Apply for 3D Printing Exterior Materials (시멘트 폴리머를 사용한 외장재용 결합재의 고온강도 특성)

  • Shin, Hyeon-Uk;Song, Hun
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2019.05a
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    • pp.116-117
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    • 2019
  • 3D printing technology can be applied to various industries, and is trapped by major technologies that change existing manufacturing processes. 3D printing materials must satisfy designability, economy and productivity, and building materials are required to have strength and economy secured technology. 3D printing technology of construction field can be divided into structural materials and internal and external materials, and is mainly done by extruding and adapting. Particularly when it is applied as an exterior materials, it is mainly applied to an unstructured exterior materials and high accuracy is required. The exterior materials can be used as a cement composite materials, it is suitable also for a lamination type, and the role of a cement base composite material is important. In this research, we developed a cementitious base binder applicable as a 3D printing exterior materials, confirmed high temperature strength characteristics for application as an exterior materials of buildings and confirmed its possibility.

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The Necessity Analysis of Development Waterproofing Materials and Methods of Construction Technologies for Green Roof (옥상녹화를 위한 방수재료 및 공법개발의 필요성에 관한 분석)

  • 권시원;오미현;강효진;오상근
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2003.05a
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    • pp.107-111
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    • 2003
  • The need for this study must be considerable, as being activate of green roofs research that the organization and construction obtain access to more development technologies. Nevertheless, the green roofs system has begun to apply since 1980's, the green roofs technology was restricted to develop without verification of technologies such as a load or water leakage. There is a limit as urethane waterproofing to almost domestic waterproofing materials and methods of construction for general green roofs. The introduction of materials and methods of construction which are appropriated to property of green roofs could be a decisive factor in a long-range durability and economical maintenance cost, moreover. it support to variety construction system and organization. This present paper describes a necessity of waterproofing and root barrier system is one of the sub-organization based on green roofs construction. which have enormously large impact on the durability.

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Study on compaction characteristics of mixed fill materials(rock and soil) in railway roadbed (철도노반 혼합(흙과 암)성토의 다짐특성에 관한 연구)

  • Kim, Dae-Sang;Park, Seong-Yong;Song, Jong-Woo;Kim, Soo-Il
    • Proceedings of the KSR Conference
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    • 2007.11a
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    • pp.505-510
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    • 2007
  • Concrete track will be constructed in Gyungbu High Speed Railway II(GHSR II) stage construction site from Daegu to Busan. Concrete track is supported by substructure consisting of the original ground and embankment and does not allow the settlement of track because of its structural type. The embankment is composed of rock and soil mixture and settlement is feasible. So management of settlement of embankment is key point in successful construction of the concrete track. Compaction management of mixed fill materials is important in minimizing the settlement of embankment. In this study, in order to assess the compaction characteristics of mixed fill materials, large laboratory compaction tests were conducted. Mixed fill materials were obtained from two construction sites in GHSR II construction site. Modeled mixed fill materials having different rock type, fine content, maximum particle diameter, and moisture contents were prepared. From the test results, compaction characteristics of mixed fill materials were analysed.

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Mixdesign for Various Aggregates Material (골재기본성질에 따른 배합설계)

  • 전현우
    • Magazine of the Korean Society of Agricultural Engineers
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    • v.15 no.2
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    • pp.3031-3038
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    • 1973
  • The aggregate materials being scottored in districts of the country were investigated to provide the data to the Consturction worker who are working without quality tests of construction materials in the small scale land consolidation, farm building construction and new village Construction projects in the country. Also results of the survey will be helpful to those who want to devise a succerrful plan in concrete execution by means of specifying a standard and technical treatment of construction materials.

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The Ancient Construction Materials and Methods: The Great Wall of China in Jinshanling as a Case Study

  • Yang, Jin;Tan, Fabian Hadipriono;Tan, Adrian
    • Journal of Construction Engineering and Project Management
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    • v.7 no.1
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    • pp.37-49
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    • 2017
  • The Jinshanling section of the Great Wall of China is a series of fortifications in northern China that was constructed for strategic military defenses. This section was first built in the beginning of the Ming Dynasty in AD 1368 and then underwent major construction, reconstruction and renovation during the late Ming Dynasty, approximately in AD 1569. The Jinshanling section is 10.5 km long, a very short section compared with the entire 21,200 km wall. The wall section is located in Luanping County, Hebei province, China. This research paper focuses on the construction methods and materials of the wall and the towers in the area. The research methodology includes site visits, knowledge acquisition of experts and 3D graphic modeling. This study reveals that the materials selected for the structure include rubbles and rammed earth, bricks, stones, timber, and mortar. The erection sequence of the wall and the towers was a bottom-up fashion using various ancient construction techniques, such as the fire-setting rock blasting techniques and the surveying techniques from the Sea Island Mathematical Manual.

A Study on the Physical Properties of Insulation Materials according to the Period of Building Construction (건축물 준공년수 경과에 따른 단열재의 물성변화에 관한 연구)

  • Kim, Hyun-Jin;Choi, Se-Jin
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2018.11a
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    • pp.92-93
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    • 2018
  • This study analyzed the physical properties of insulation materials upon completion of building completion years and found the suitability of the current energy performance analysis methodology to apply the insulation specified in the design drawings to the same thermal conductivity values as the new materials.

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A Study on Finances and Factors of weighting Cost in Government Constructions in the Late of Chosun Dynasty (조선 후기 관영건축공사(官營建築工事)의 재원과 비용 절감 방안에 관한 연구)

  • Lee, Kweon-Yeong
    • Journal of architectural history
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    • v.11 no.3 s.31
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    • pp.53-68
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    • 2002
  • Since the 17th century, the finance for the government construction was demanded unlike the early chosun dynasty. It was consequent upon a transition in the supply method of materials and labors for the construction. The government construction being enforced in chronic financial difficulties had to undergo lack of funds. Especially, a rising construction cost by purchasing lots of materials including wood, and by employing labors weighted the difficulties. In order to put forward a construction, new and various efforts besides diversification in sources of finance ad been looked for. The efforts were driven in three parts which were to be the management of labor and materials, and the way of construction execution. As a result of spending a great effort to save cost, an extinguished improvement in the way of construction execution came out with 'Injungjeon-yeongkweon' in the year 1805.

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Existing and progress control research of Existing quantity the integrated information Uses WBS-CBS. (WBS-CBS통합정보의 실적수량에 의한 기성 및 진도관리에 관한 연구)

  • Ahn, Jae-Hong;Lee, Young-Do
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2009.11a
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    • pp.261-264
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    • 2009
  • Construction projects are managed by focusing on the results of projects. Moreover, cost and schedule are managed separately even though the efficiency of integrated management is very high. This paper proposes existing and progress control research of existing quantity the integrated information uses WBS-CBS. Schedule and cost are most important in construction projects. Specially, progress and cost are relationship of the managing integrated in many construction management. The quantity of materials for the works of construction is the base to create activities and a network. The quantity of materials of materials for the elemens of a building is a base of cost estimation and resource. allocation. This study suggest method for relating the schedule and cost information through the case study of construction field engineers.

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