내화피복공법 적용 고강도 콘크리트의 내화성능 확보 방안에 관한 실험적 연구

김정진(Kim, Jeong-Jin) 대한건축학회 2014 大韓建築學會論文集 : 構造系 Vol.30 No.3

Owing to the dense internal organization of high-strength concrete, water vapor generated within the concrete cannot be easily discharged to the outside. The increased internal vapor pressure leads to a phenomenon known as spalling. This study investigated the use of fire-protection covering methods for preventing the spalling of high-strength concrete in order to inhibit temperature transmission to concrete structure by covering the material and to minimize the increase in cross-section. The fire-protection covering methods considered included fireproof plaster boards, high-performance fireproof plaster boards, and a composite covering method (fireproof plaster board + intumescent coating system). Among these, the high-performance fireproof plaster board exhibited 20∼40 % higher fire protection performance compared to the regular fireproof plaster board. If the composite covering material is exposed to high-temperature fires, especially above 500°C, a 4 mm-thick intumescent coating system extends up to at least 50 mm, thereby blocking most of the heat transferred inside the board and suppressing the temperature increase within the concrete. The above-mentioned mechanism leads to more than 40 % decrease in the coating thickness. The restrictive application of this method could reinforce fire protection performance on finishing parts of gypsum board in existing buildings.

방화 석고보드와 방화방수 석고보드의 내화성능 평가를 위한 연구

옥치열(Ok, Chi-Yeol),김재준(Kim, Jae-jun) 대한건축학회 2016 대한건축학회 학술발표대회 논문집 Vol.36 No.2

In this study, There are no performance difference of fire-protected waterproof gypsum board and Fireproof gypsum board in accordance with the Korea Industrial Standard, fire resistant structure composed of these boards has been recognized as a distinct structure. we study experimentally the differences in the performance of fire protected waterproof gypsum board, fireproof gypsum boards to get recognition as a fire resistant structure. and it will be used as objective data about the fire performance of domestic manufacturers of fire protected waterproof Gypsum board.

방화석고보드를 적용한 MCO 보의 내화공법에 관한 연구

이재승(Lee Jae-Sung),김흥열(Kim Heung-Yeal),조봉호(Cho Bong-Ho),김형준(Kim Hyung-Jun),김갑득(Kim Gap-Deug) 대한건축학회 2008 大韓建築學會論文集 : 構造系 Vol.24 No.11

Modular construction method is based on pre-fabricated unit module in a factory and assembling of the unit module in a construction site. The main advantage of the modular system is that the construction time can be reduced by small weather impact on scheduling, the relatively easy availability of machines and services in a well-structured factory environment, and so on. Fire-proofing paints have been used as the fire resistance material in modular buildings. However, in the modular system, the fire resistance method using the paint is uneconomical due to several painting works and long drying time. The purpose of this study is to develop the fire resistance system of the MCO beam (Modular Construction Optimized Beam) using fireproof board to reduce the construction time for fire resistance. This study presents a proper fire resistance system for the modular buildings using fireproof board with optimized values for thickness of fireproof board and space between MCO beam and fireproof board.

굴 패각을 활용한 내화모르타르의 고온수열에 따른 성분변화에 관한 연구

홍상훈 ( Hong Snag-hun ),정의인 ( Jung Ui-in ),김봉주 ( Kim Bong-joo ) 한국건축시공학회 2017 한국건축시공학회 학술발표대회 논문집 Vol.17 No.1

IN order to use it for high-temperature fire, Fireproof boards mainly composed of Ca and Mg used. Korea does not have a fireproof board for explosive high temperatuer fire in tunnel, and it is applying existing fireproof coating.However, when a high-temperature fire(1350℃)with explosion occurs, it can not sustain its strength and can not be destroyed to have fire resistance. Each year,more than 100,100tons of wastes are produced by using Ca as an oyster shell. In this study, we try to determine whether or not to reuse the heat-heated fireproof board.

방화석고보드를 적용한 모듈러 보의 최적 내화성능 형상조건 도출을 위한 해석적 연구

김형준(Kim Hyung-Jun),김흥열(Kim Heung-Youl),이재승(Lee Jae-Sung),조봉호(Cho Bong-Ho) 대한건축학회 2009 大韓建築學會論文集 : 構造系 Vol.25 No.7

The study was intended to conduct the heat transfer analysis of the structural elements that serves the basis of performance-based fire resistance evaluation which has been widely implemented by the fire-related institutes (BRE, SP, NIST etc) in advanced nations, thereby carrying out the element temperature evaluation and the effect of heat characteristics under the standard fire condition (ISO). Based on this, an analytic study aimed to develop the performance-based fire-responding temperature control and improve the shape of the elements under the nonlinear stress condition in fire was carried out. The study to identify the optimal shape condition was conducted in an effort to develop the reliable fire resistance performance of the modular beam. This heat transfer analysis was conducted prior to carrying out the costly fire test so as to provide the numerical analysis technology enable to repeat the process, and based on data from the preceding test for material properties depending on temperature of component material, analysis modeling was implemented. ABACUS 6.7.1, an analysis program using finite element analysis method was employed as interpretation software to predict the fire resistance performance through the maximum temperature analysis of the modular beam, which enables to determine the optimal interval of modular beam and the thickness of fire-resistant gypsum board. And the verification experiment was followed based on the result of the analysis outcome. It was determined to use 30㎜ thick fire?resistant gypsum board for optimal fire resistance, and it was found to be able to grant the 180-minute fire resistance under the standard fire condition when the interval was set as 30㎜.

방화석고보드 부착이 섬유혼입 고강도 콘크리트 모의 기둥부재의 내화특성 및 잔존내력에 미치는 영향

양성환 한국건축시공학회 2012 한국건축시공학회지 Vol.12 No.4

In this study, fire resistance and residual strength were examined after the addition of PF fiber and bonding fireproofing gypsum board to a high strength concrete-model column of 50 MPa grade. At the beginning of the experiment, all the properties of base concrete appeared to satisfy the target range. In terms of the internal temperature record, a trend of slightly high temperature was shown when the fireproofing gypsum board was not bonding, and when the fireproofing gypsum board was bonding, as PF content increased gradually, the temperature was gradually lowered. In terms of the relationship, as time elapsed a low temperature was shown when fiber was mixed, and when the board was bonding, the trend of lower temperature could be confirmed. Meanwhile, in terms of spalling property,a severe explosive fracture was generated at PF 0%, and falling off was prevented as the fiber content was increased;however, discoloration and a multitude of cracks were discovered, and when the board was bonding, the trend in which the exterior became satisfactory when the content was increased emerged. In terms of the residual compressive strength, measuring of strength could not be performed at PF 0% without bonding of board, and the strength was increased as the fiber content was increased; however, there was a decrease in strength of about 30 ∼ 40%, and in the case of PF 0% with the bonding of board, the strength could be measured; however, about an 80% decrease in strength was shown, and only about a 10 ∼ 20% decline in strength was displayed, as the range of decrease was reduced as the fiber content was increased. Considering all of these factors, it was determined that a more efficient enhancement of fire resistance was obtained when two methods are applied in combination rather than when the PF fiber content and bonding of fireproofing gypsum board are utilized individually. 본 연구는 50 MPa급 고강도 콘크리트 모의 기둥부재를대상으로 PF섬유 혼입 및 방화석고보드를 부착하므로써, 내화특성 및 잔존내력에 대하여 검토하였다. 먼저, 모체 콘크리트의 기본 물성은 모두 목표 범위를 만족하는 것으로 나타났다. 내부 온도이력은 방화석고보드가 미부착된 경우 온도가 다소 높게 나타나는 경향을 보였고, 방화석고보드가부착된 경우는 섬유 혼입율이 증가할수록 온도가 점차 낮게분포되었다. 상호관계로는 시간이 경과할수록 섬유가 혼입된 경우에서 낮은 온도분포를 나타내었으며, 보드가 부착되었을 때 더욱 낮은 온도 경향을 확인할 수 있었다. 한편, 외관성상은 PF 0 %에서 심한 파괴 폭렬 현상이 발생하였으며, 섬유혼입율이 증가할수록 탈락 현상은 방지되었으나,색상 변질 및 다수의 균열이 발견되었고, 보드가 부착된 경우는 혼입율이 증가할수록 외관이 양호해지는 경향을 나타내었다. 잔존 압축강도로 보드 미부착 PF 0 %에서는 강도측정이 불가능하였으며, 섬유혼입율이 증가할수록 강도는증가하였으나, 약 30∼40 %의 강도저하 현상을 나타내었고, 보드 부착 PF 0 %의 경우 강도측정은 가능하였으나 약80 % 가량 강도가 저하하였으며, 섬유혼입율이 증가할수록저하폭은 감소하여 약 10∼20 %의 강도 저하만을 나타내었다. 이상을 종합하면, PF섬유 혼입 및 방화석고보드 부착을개별적으로 사용하는 것보다는 두 가지 방법을 복합적으로적용할 때 내화성능 향상에 있어서 보다 효과적일 것으로분석되었다.

굴 패각과 건식공정 바텀애시를 사용한 내화보드의 가열실험

정의인 ( Ui-in Jung ),김봉주 ( Bong-joo Kim ),김진만 ( Jin-man Kim ) 한국건축시공학회 2016 한국건축시공학회지 Vol.16 No.3

본 연구는 산업폐기물로 발생되는 굴 패각과 건식공정바텀애시를 골재로 활용하여 제작된 내화보드의 가열실험을 통한 성능에 관한 연구이며 다음과 같은 결론을 도출하였다. 전기로 가열실험을 통해 나타난 시험편의 이면온도는 300℃ 가열상황에서 103.1℃∼125.1℃로, 600℃의 가열상황에서 201.1℃∼210.1℃로, 900℃의 가열상황에서 249.2℃∼276.9℃의 범위로 나타났다. 내화보드 시험편의 경우 일정온도상승 이후 유지되는 것으로 나타나 사용재료들의 경우 내화성능이 발휘되는 것으로 판단된다. 실험의 결과로 유추할 때, 입자의 크기가 작을 경우 600℃까지는 내화성능이 상대적으로 우수하지만, 그 이상의 온도에서는 입자의 크기가 큰 경우 많은 공극을 포함하여 열전달이 지연되는 것으로 판단된다. This study is a research about performance of fireproof board using industrial waste such as oyster shell and dry process bottom ash through the heating test and conclusions were obtained as follows. Test samples show back side temperatures as follows : in 300℃, 103.1∼125.1℃, in 600℃, 201.1∼210.1℃, in 900℃, 249.2∼276.9℃. In the test, temperature increases of specimens of fireproof board are kept at certain temperatures hence it could be concluded that the specimens withstand high temperatures. According to the test, it could be concluded that fireproof board made by smaller particles shows better performance up to 600℃ while at higher temperatures, fireproof board made by bigger particles shows better performance. It is estimated that fireproof board made by particles of bigger size has more pore structure and it delays heat conduction.

섬유혼입율 및 개발 내화피복용 보드의 두께 변화가 고강도 콘크리트 모의 기둥부재의 내화특성 및 잔존내력에 미치는 영향

양성환(Yang, Seong-Hwan) 대한건축학회 2011 大韓建築學會論文集 : 構造系 Vol.27 No.12

This study investigates the combined effect of fiber addition and fireproofing protection board on fire resistance of high strength concrete. For fiber addition, the fiber type combining polypropylene and nylon (polylon) was selected based on previous work to achieve the optimum level of fire resistance. For thermal barriers, to achieve full fire resistance and to avoid falling-off from substrate concretes during fire exposure. constituents, mixture proportion and installation were also chosen based on previous work. Different contents of the fibers and different thicknesses of the thermal barriers were applied to concrete specimens. Fire tests were conducted according to the standard heating curve of ISO-834. Test results showed that the concrete with a single use of fiber addition could resist spalling, but resulted in the failure of a minimum temperature limit regulated by a fire code. These results were constantly observed, regardless of fiber content. In addition, the concrete with a single use of thermal barriers protected the substrate concrete from spalling, but deteriorated residual properties after fire exposure. However, this study found that the concrete with the application of both fiber addition and thermal barriers together significantly improved the fire resistance and residual properties of the concrete. In particular, the residual strength of the concrete with fiber addition and thermal barriers was enhanced 30 to 40% higher than the concrete with fiber addition only, which implies that this simultaneous application makes the substrate concrete after fire exposure equal to the control concrete at room temperature in terms of the level of residual strength.

내화피복 종류에 따른 각형강관 구조부재의 내화성능평가

권기혁(Kwon, Kee-Hyuk),신경재(Shin, Kyung-Jae),이준섭(Lee, Jun-Seop),노다훈(Noh, Da-Hun),이강민(Lee, Kang-Min) 한국강구조학회 2021 韓國鋼構造學會 論文集 Vol.33 No.3