• Korean Journal of Construction Engineering and Management
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• v.15 no.1
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• pp.101-110
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• 2014

The ministry of Land, Infrastructure and Transport announced that they launched the pilot project to offer Happy House built with modular construction as part of the major projects of incumbent government in 2013. The market size of modular construction is getting increasingly enlarged together with strong will of government. The major challenges that current modular construction encounters can be summed up as lack of standardization of material on the stage of design and fabrication. The portion of material costs in modular construction marks 16 to 17% higher than the existing other construction method, and account for 60 % of total construction cost, which is why material management is the most important factor. However, the imperfect standardization and specification on design causes high loss of materials on fabrication, which makes the construction wastes and total construction cost increasing in accordance with the increase of material costs. This study has been conducted to verify major modules by developing optimization algorithm on gypsum board material among wall finishing materials. It is expected that this paper contributes not only to eco-friendly construction by minimizing the waste factors of materials through these efforts, but also to removing high cost issues which had been recognized as a setback of current modular construction.

• Proceedings of the Korean Nuclear Society Conference
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• 2001.05a
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• pp.424.2-424
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• 2001

• Proceedings of the Korean Institute of Industrial Safety Conference
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• 2000.06a
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• pp.190-195
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• 2000

현재 미국과 유럽, 일본 등에서는 실내 벽 및 천장 마감재에 관하여 성능 기준 설계에 의한 새로운 평가방법이 활발하게 연구되고 있다. 예를 들면 시험에 소요되는 시간과 경비를 절감하고자 Bench-scale test 결과를 이용하여 화재위험성을 예측하는 내장재의 Performance-based fire safety design에 관한 연구가 진행되고 있다. 한편, 성능기준 화재안전 설계를 적용하기 위하여 현재 사용하는 대부분의 존 모델 프로그램은 공간화재시 가연성 마감재의 발화 및 화염확산 및 위험성을 충분히 고려하지 못하고 있다. (중략)

• Proceedings of the Korea Institute of Fire Science and Engineering Conference
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• 2011.04a
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• pp.334-339
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• 2011

이 연구에서는 내화천장구조 재료의 고온 열특성을 파악하여, 건축물 화재시 천장구조에 대한 보다 정확한 화재성상예측을 위한 실험적 자료로 제시하고자 한다. 건축물의 화재성상 예측은 내화설계 시 반드시 필요하며, 화재성상예측을 위해서는 화재하중, 작용외력, 안전계수 및 설계용 정수의 합리적인 설정이 중요하다. 화재하중 및 작용외력 등은 건축물의 부재가 지니는 하중조건에 대한 화재시의 부재 안정성 예측에 관계되는 부분이며, 설계 시 필요한 데이터 중 내화천장구조 재료의 고온 열특성 값은 화재발생 구획의 화재온도가 주요 구조부재에 전달되는 정도를 예측할 수 있는 인자로 볼 수 있다. 따라서 내화천장구조 재료의 고온 열특성 값 설정은 화재발생 공간의 온도범위($20{\sim}1000^{\circ}C$)에 걸쳐 평가 및 분석되어야만 정확하고 신뢰성 있는 화재발생 예상 공간의 부재 온도 및 안전성 분석이 가능하다. 이에 국내 건축구조물에 사용되고 있는 대표적인 내화피복 재료인 방화석고보드, 텍스, 암면에 대해서 $20^{\circ}C{\sim}900^{\circ}C$까지의 열전도율을 측정하였다. 실험결과 방화석고보드와 텍스의 경우 약 0.15 W/m K까지 일정하게 증가하였다. 암면의 경우 약 $700^{\circ}C$까지는 방화석고보드나 텍스에 비해 열전도율이 낮게 나타났지만, $800^{\circ}C$ 지점부터 용융 및 탄화가 진행되면서 열전도율이 급격히 상승하는 것으로 나타났다.

• Proceedings of the Korean Nuclear Society Conference
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• 2002.10a
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• pp.361-361
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• 2002

• Proceedings of the Korean Institute of Building Construction Conference
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• 2008.05a
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• pp.67-71
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• 2008

The study analyzed on fire resistance of high strength concrete followed by thickness of fireproof plaster board and change of adhesive method. In spalling characteristics after fire resistance test, all four-side covering concretes were left out of testing screens. Thus, serious spalling was happened by exposing their internal reinforcing rods. in partial testing screens, spalling was happened till the internal concrete of main reinforcing rod. Only, temperature history didn't have special differences among changes of adhesive method. However, thickness of fireproof plaster board is very important. Namely, mock member reinforcing 25mm general adhesive + Bending was 583℃ in the highest temperature of surface part and 479℃ in the highest temperature of the main reinforcing rod, which was relatively good temperature history.

• Applied Chemistry for Engineering
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• v.21 no.5
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• pp.570-574
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• 2010

The main function of conventional insulation materials is only to block the heat transfer and reduce heat loss from the building. On the other hand, thermal storage materials can work as an energy saver by absorbing or emitting heat within a specific temperature range. Thermal storage materials for building can maintain a constant temperature by effectively regulating the cycle of indoor temperature. As a result, we can enhance the performance of a cooling and heating system efficiently. In this study, phase change materials (PCMs) were added as thermal storage materials into gypsum boards which are extensively used for building material and we found out the thermal environmental characteristics. In addition, we checked out some problems when applying the thermal storage materials to buildings. Finally, This study set out to examine the degree of environmental-friendly characteristics of thermal storage building materials by analyzing the amount of TVOC and HCHO contents with the possibility of pollutants emission.

• Fire Science and Engineering
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• v.25 no.3
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• pp.91-98
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• 2011

This study is about fire resistance performance of wood framed lightweight wall including a middle lintel as a traditional wall form in Korea. The target wall is non-loadbearing system which constructed with $38{\times}89$ mm ($2"{\times}4"$) wood frame and fireproof gypsum board covering, including a middle lintel made of $150{\times}150$ mm section glue-laminated timber. As a test results, all specimens have showed fire resistant performance over 90 minutes and tests were maintained until flame occuring on Specimen-l, 2, 3 at 91 min, 97 min and 98 min respectively. Fire resistance of the heat side gypsum board was 45 minutes and charring rate of middle lintel was equivalant with that of usual timber. The wood stud inside wall system showed relatively quick combution characteristic when exposed to high temperature with no temperature rising delaying time caused by moisture evaporation because of the dehydration preceded during the early period of fire side gypsum board resist to heat.

• Journal of the Korea Institute of Building Construction
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• v.18 no.1
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• pp.9-15
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• 2018

Radon gas, which is present on the earth, is a primary carcinogen released from rocks, soil, building materials, etc., and exists as a unique gas phase. In order to solve the risk of radon gas, we evaluated the basic performance which can be used as indoor finishing materials in addition to the radon gas reduction properties of the matrix using anthracite. An anthracite used as a conventional filter material was used to produce a matrix, and a test was conducted to replace the gypsum board, which is one of the building materials used in the existing room. As the anthracite replacement ratio increases, flexural failure load strength increases and thermal conductivity tends to decrease. Depending on the thickness of the board, the reduction performance of radon gas shows a slight difference.

• Analytical Science and Technology
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• v.13 no.2
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• pp.158-165
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• 2000

The purity of gypsum and quantitation of impurities of flue gas gypsum will not only play an important role in deciding of the optimal condition during a trial run of FGD (flue gas desulfurization), but also can be utilized in quality control of gypsum. The purity of gypsum can be determined from combined water, sulfur trioxide and calcium concentration. We found that the thermal analysis by TGA (thermogravimetric analysis) was the most accurate and convenient method to determine the purity of gypsum. This method will be done in a hour and the results were reproducible. On the other hand, the best way of the analysis of impurities in gypsum was fusion method using $LiBO_2$ as a fusion agent. We also determined the amount of $CO_2$ gas to analyze magnesium carbonate and calcium carbonate contents. The analyses of combined water by TGA, fusion method followed by ICP-AES (inductively coupled plasmaatomic emission spectroscopy) and determination of $CO_2$ amount can lead to more accurate and convenient method for gypsum analysis.