공사시방서 활용방안

장덕배 한국건축시공학회 2017 건축시공 Vol.17 No.3

주거현장에서 창호 결로저항 성능을 확인하기 위한 다양한 실험 방법에 대한 고찰

장덕배(Jang, Duk-Bae),홍구표(Hong, Goo-Pyo) 대한건축학회 2012 대한건축학회논문집 Vol.28 No.6

Condensation has been a persistent and often misunderstood problem associated with windows. The purpose of this study was to analyze the tests about the condensation resistance for windows. We tested the condensation by Computer Simulation (WINDOW & THERM), Mock-up Test and Field Test. First, We conducted the simulation as pre-analysis. Second, We did Mock-up Test in the official approval laboratory, and last we made same condition in the residential building and measured the window surface’s temperatures. TDR values were calculated by measured temperatures and We observed the condensation of windows. It is possible that we could use three methods(Simulation, Mock-up Test and Field Test) to analyze the condensation resistance. Analyzing the condensation resistance result from the Field Test, we can verify the level of air tightness and quality of construction finish and also possible to improve it.

한중 콘크리트의 가열보온 양생막용 개량형 버블시트의 현장시공적용을 통한 성능평가

장덕배(Jang, Duk-Bae),최현규(Choi, Hyun-Kyu) 대한건축학회 2011 大韓建築學會論文集 : 構造系 Vol.27 No.11

Using cold weather concrete, you should know that how to maintain curing temperatures for its initial curing is very important, because it can cause frost damage at the beginning. So they mostly apply heating-insulation curing method for retaining curing temperatures of cold weather concrete in the domestic construction site. And thetent fabrics as curing sheet for heating-insulation curing are prevalent in the domestic construction site due to low price and easiness to handle. But the material is very low in insulative efficiencyand high in heat-loss coefficiency; moreover, it is easily torn off and a successive rupture phenomenon arises due to its low tensile performance, which makes it difficult to maintain the temperatures fit for curing, so frequently they have trouble in preventing the frost damage at the beginning due to the low efficiency in heating-insulation curing process. Accordingly, this study aims at verifying the efficiency in the use of the imporved bubble sheet for heating-insulation curing sheet through the analysis of concrete structure, temperature history of the space for installing the curing sheet, and strength property of concrete by applying the improved bubble sheet, which is created by reinforcing the tensileness of the bubble sheet excellence in insulative performance with mesh-tarpaulin as heating ?insulation curing sheet for cold weather concrete, to a field in the cold weather. As a result, it is verified that when you use improved bubble sheet as a substitution for the tent fabric, it is very efficient in the control of cold weather concrete quality and has great effectiveness in securing strength because of high tensileness and excellent insulativeness in the cold weather environment.

조분시멘트에 의한 개량2성분계 저발열시멘트를 활용한 매트기초 매스 콘크리트의 현장시공 적용

장덕배(Jang, Duk-Bae) 대한건축학회 2011 大韓建築學會論文集 : 構造系 Vol.27 No.10

This paper is to validate the effect of the application of improvement binary blended cement with the combination of OPC, FA and coarse particle cement on the reduction of hydration heat for field application. Mat foundation at the basement floor of steel reinforced concrete building constructed at Seoul OO project is considered for field application of the improvement binary blended cement. Slump, air content and chloride content met the target values. Compressive strength also satisfied the design strength at 28 days. According to temperature history, crack occurrence index at the center section in A, B and D placement zones had over 1.5, which can be protected from crack, while crack occurrence index at C placement zone had around 1.2∼1.5, which requires proper crack prevention measures. However, there are no significant crack induced by excessive hydration heat to be observed at the concrete after placement based on visual survey. Accordingly, it is thought that the application of improvement binary blended cement studied in this paper is valid to control the hydration heat of the mass concrete.

한국예술종합학교에서의 노출마감공법 적용

장덕배(Duk-Bae Jang),최장식(Jang-Sik Choi) 한국콘크리트학회 2006 콘크리트학회지 Vol.18 No.6

굵은입자 시멘트와 광물질 혼화재를 조합 사용하는 콘크리트의 기초적 특성

한천구,장덕배,Han, Cheon-Goo,Jang, Duk-Bae 한국건설순환자원학회 2010 한국건설순환자원학회지 Vol.5 No.1

본 연구에서는 보통포틀랜드 시멘트(이하 OPC)제조과정의 분쇄공정 중 밀출구에서 배출되는 비교적 가격이 저렴하면서, 수화열면으로도 효과일 것으로 예상되는 입자분포를 갖는 시멘트(이하 CC)를 대상으로 플라이애시(이하 FA)와 고로슬래그 미분말(이하 BS)를 복합치환하는 3성분계 저발열 시멘트로의 개발 가능성을 검토하기 위하여 유동성, 강도, 간이단열온도 상승량 등 기초적인 특성에 대하여 분석하고자 한다. 실험결과로 유동성은 CC의 치환율이 증가함에 따라 저하하는 경향을 보였고, FA+BS의 치환율이 늘어남에 따라 증가하는 경향을 나타냈다. 공기량은 CC의 치환율이 증가함에 따라 미소하게 감소하는 경향을 나타냈고, FA+BS의 치환율이 증가함에 따라 감소하였다. 응결특성으로 CC 및 FA+BS의 치환율이 증가 할수록 응결 시간은 지연되었다. 간이 단열에 의한 온도 상승량은 전반적으로 CC 치환율이 증가할수록, FA+BS의 치환율이 증가할수록 피크온도는 감소하였고, 이후 온도저하가 완만해 지는 경향을 나타냈다. 압축강도는 CC 및 FA+BS 치환율이 증가할수록 저하하였는데, 재령이 경과함에 따라 장기강도는 Plain과 동등하거나 동등 이상의 강도를 발현 하였다. 종합적으로 CC에 FA+BS를 치환하였을 때 유동성 및 공기량은 저하하는 경향을 나타냈으나, 수화열 면에서 양호한 저감효과를 보여 3성분계 저발열 시멘트로의 개발이 가능성할 것으로 사료된다. This research intends to analyze the basic characteristics of cements(hereinafter "CC") with affordable price and particle distribution effective as hydration heat face which are discharged at the outlet of smashing process of ordinary portland cement(hereinafter "OPC") manufacturing process such as fluidity, rigidity, temporary insulation temperature increase amount etc to review the potential of developing "CC" to 3 ingredients low heat cement that substitutes fly ash and blast furnace slag(hereinafter "BS"). As a result of experiment, fluidity tended to decrease with increase in CC substitution rate, and increase with increase in FA+BS substitution rate. Air amount tended to slightly decrease with increase in CC substitution rate, and decrease with increase in FA+BS substitution rate. Condensation characteristics were such that condensation time was delayed with increase in CC and FA+BS substitution rate. As for the temperature rising amount by temporary insulation, peak temperature decreased with increase in CC substitution rate and increase in FA+BS substitution rate in general, and thereafter, temperature tended to decrease slowly. Compressive strength decreased with increase in CC and FA+BS substitution rate, and as aging goes on, long term strength was equivalent to plain or higher. By and large, when FA+BS was substituted to CC, fluidity and air amount tended to decrease, but hydration heat face showed good reduction effects, suggesting possibility of development to 3 ingredients low heat cement.

조분(粗粉) 시멘트와 플라이애시를 복합 치환한 매트 기초 매스콘크리트의 현장적용

한천구,장덕배,이충섭 한국건축시공학회 2010 한국건축시공학회지 Vol.10 No.4

매스콘크리트를 시공함에 있어 수화열은 균열에 직접적으로 영향을 미치는 중요한 요인이다. 그러나, 우리나라의경우 이와 같은 저발열형 시멘트를 이용하는 방법은 거의채택되지 않고, 값싼 플라이애시나 고로슬래그미분말 등의혼화재만을 치환하여 수화열을 줄이고 있는 실정이다. 그런데, 이렇게 혼화재만을 다량 치환하게 되면 내구성 품질에악영향을 미쳐 구조물의 성능을 저해하는 요소로 작용할수 있으므로 조분(粗粉)시멘트(CC)를 사용하면서 혼화재를복합 치환함으로서 성능저하를 최소화 하며, 수화열을 줄일수 있는 새로운 공법의 개발이 가능할 수 있을 것으로 추측된다. 이에 본 연구에서는 OPC에 CC와 함께 FA를 복합 치환하여 분말도를 약 3 000 ± 200 ㎠/g으로 조정한 시멘트를실용화 할 목적으로 Mock-up test를 진행한 후 이를 실무현장에 적용하도록 한다. This study carried out a Mock-up test to apply Low-heat Cement (CF) that is adjusted to a fineness of 3,000±200cm2/g by substituting Coarse particle Cement (CC) and fly ash with ordinary Portland Cement (OPC), then applied it on-site. The result of the test is as follows. The Mock-up test showed that the amount of admixture in CF increased SP agent and AE agent slightly more compared to OPC, while temperature history showed that the highest temperature of CF was around 6∼10℃ lower than that of OPC. Compressive strength in CF was low compared to that of OPC, but the strength width became narrow at the age of 28 days, which is not considered to be significant. In on-site application, slump, air content and chloride content all satisfied the target values, while the temperature history showed that the highest temperature in the center by each cast was about 34℃ in the first cast, 42℃ in the second cast, and 39℃ in the third cast. Compressive strength of specimen for strut management showed low value compared to standard curing, but its strength was reduced at the age of 28 days.

2중 버블시트로 단열처리된 옹벽의 온도이력 및 결로 방지 특성

정은봉,장덕배,한천구 청주대학교 산업과학연구소 2013 産業科學硏究 Vol.30 No.2

This study investigates the effect of double layered bubble sheets on the side condensation of concrete cast for the retaining walls placed underground in practice. Temperature history was measured during summer and winter, in order to examine the level of the insulation performance of the double layered bubble sheets and to estimate the level of side condensation of the concrete structures applied in practice. Test results showed that in summer, the double layered bubble sheets applied to the outside of the retaining walls obstructed the low heat and moisture transfer, arising from the earth behind the walls. This effect maintained the temperature and the humidity of the retaining wall structures and thereby resulted in the protection of the side condensation. In addition, in winter, the similar effect of the double layered bubble sheets on the protection of the side condensation in the retaining walls was achieved. It is concluded that the double layered bubble sheets have a significant effect on insulating concrete structures, especially on the full protection of side condensation of the retaining wall during both summer and winter.

혼화재 종류 및 양생조건에 따른 속경성 SBR 시멘트 모르타르의 강도

조영국,정선호,장덕배 한국건축시공학회 2011 한국건축시공학회지 Vol.11 No.6

Ultra rapid-hardening cement is widely used for latex-modified mortar and concrete as repair and finishing material during urgent work. The purpose of this study is to evaluate the improvements in strength made to SBR cement mortars by the adding of various admixtures and by the use of different curing methods. SBR cement mortar was prepared with various polymer-cement ratios, curing conditions and admixture contents, and tested for flow, flexural and compressive strengths. From the test results, it was determined that the flow of SBR cement mortar increased with an increase in the polymer-cement ratio, and the water reducing ratio also increased. The strength of cement mortar is improved by using SBR emulsion, and is strengthened by adding metakaoline. The strength of SBR cement mortar cured in standard conditions was increased with an increase in the polymer-cement ratio, and attained the maximum strengths at polymer-cement ratios of 15 % and 10 %, respectively. The maximum strengths of SBR cement mortar are about 1.8 and 1.3 times the strengths of plain mortar, respectively. In this study, it is confirmed that the polymer-cement ratio and curing method are important factors for improving the strengths of rapid-hardening SBR cement mortar. 폴리머 시멘트 모르타르를 긴급공사의 보수․보강 재료로사용할 때, 초속경시멘트와 혼입하여 사용함으로써 시멘트의 빠른 응결과 시멘트 매트릭스 내부에서 형성된 폴리머필름의 작용이 물리적 성질과 내구성을 개선시킬 수 있다. 또한 각종 혼화재료를 혼입함으로써 매트릭스 내부 공극을충전하여 성질을 개선시킬 수 있는데, 양생방법이 큰 영향을 미칠 수 있다. 본 연구에서는 속경성 SBR 시멘트 모르타르의 압축강도와 휨강도에 영향을 미칠 수 있는 혼화재료와양생조건에 관하여 실험을 실시하여 그 영향성을 평가하고자 하였다. 본 연구결과, 초속경시멘트 모르타르에 SBR을혼입함으로써 휨강도와 압축강도가 크게 개선되었으며, 여기에 메타카올린을 혼입함으로써 보다 더 강도를 증진시킬수 있었다. 또한 양생방법에 있어서도 SBR을 사용한 경우에는 표준양생에서, SBR을 사용하지 않은 경우에는 수중양생에서 강도발현이 크게 나타났다.

저탄소 결합재를 다량 치환한 콘크리트의 품질특성에 관한 연구

김경민,이지환,장덕배 대한건축학회지회연합회 2014 대한건축학회연합논문집 Vol.16 No.6

본 연구는 고로 슬래그 미분말 및 플라이애시와 같은 저탄소 결합재의 사용량별 성능평가 데이터 확보를 통해 저탄소 결합재 다량 치환콘크리트의 범용적인 활용성을 도모하고, 실제 현장적용 시 발생할 수 있는 문제점을 사전에 파악하는데 목적이 있다. 그에 따라 대표적인 저탄소 결합재를 대상으로 2, 3성분계 저탄소 콘크리트에 대한 검토를 실시한 결과 저탄소 결합재 사용을 통해 콘크리트 물성이 개선되고, 수화열이 저감되는 장점을 나타내었지만, 초기 압축강도 저하문제를 재확인 할 수 있었다. 따라서 실제 현장에 저탄소 콘크리트를 적용 할 경우 본 콘크리트의 장․단점을 고려하여 시공하여야 할 것이며, 저탄소 콘크리트의 응결과 조기강도 증진을 위한 결합재 개선에 관한 연구가 추가적으로 이루어져야 할 것으로 사료된다. This study is trying to understand the problems caused by it as a result of the performance evaluation relates to the use of a large amount of low-carbon binder such as fly ash or ground granulated blast furnace slag, and use a lot of low-carbon binder. In response thereto, intended for fly ash and blast furnace slag are binder that were typically performed examined Binary system, ternary system low carbon concrete. Result of the examination, I showed the characteristic usage of low-carbon bond material increases, Fluidity is improved, and the heat of hydration is reduced. However, it was possible to reconfirm the problem that the initial compressive strength is lowered. Therefore, there is research on the improvement of the binder to increase the early strength and setting time of the low-carbon concrete is further performed.