With the increasing number of aging buildings across Korea, emerging maintenance technologies have surged. One such technology is the non-contact detection of concrete cracks via thermal images. This study aims to develop a technique that can accurately predict the depth of a crack by analyzing the temperature difference between the crack part and the normal part in the thermal image of the concrete. The research obtained temperature data through thermal imaging experiments and constructed a big data set including outdoor variables such as air temperature, illumination, and humidity that can influence temperature differences. Based on the collected data, the team designed an algorithm for learning and predicting the crack depth using machine learning. Initially, standardized crack specimens were used in experiments, and the big data was updated by specimens similar to actual cracks. Finally, a crack depth prediction technology was implemented using five regression analysis algorithms for approximately 24,000 data points. To confirm the practicality of the development technique, crack simulators with various shapes were added to the study.

Most apartment houses have been constructed with concrete structures. However, underground parking lots and rooftops in apartment buildings frequently have cracks due to drying shrinkage and various degradation factors. The leakage caused by this cracks has a problem that the durability of the structure and the waterproof performance is deteriorated. Therefore, the development of a proper crack repairing materials is continuously required. The purpose of this study is to apply chemically bonded ceramics (CBC) as a repair material to repair cracks in concrete, which has strong adhesion, durability, rapid hardening performance. Therefore, it was applied to the roof crack of the apartment(mock-up test) and the performance was evaluated. As a result, the compressive strength and the bond strength showed excellent performance. In the case of the dry shrinkage characteristics, the performance was stable in the range of -35 to 43 × 10 -6 until 20 days of age. In addition, the mock-up test results showed good workability and surface condition, and surface polishing is possible after 2 hours of consruction, which is considered to be very effective for Reducing work time.

In this study, we tried to review the potential of commercialization of the developed product of aerated concrete and floor mortar used in the construction of residential buildings such as apartment buildings. As a result, it was analyzed that the difference was negligent in terms of the depth of subsidence, though the developed product was good enough in terms of compressive strength and economic efficiency.

In this study, mock-up test of ternary blended concrete using structure was conducted in order to evaluate the temperature rise. The results of the mock-up test, it was found that it was convenient to obtain the minimum temperature rise of 3:5:2 mixing.

It is necessary to develop application design technology and modular of reinforcing bar. After reviewing the rebar drawing of the NPP Stucture and performing the mock-up test, the rebar modularization method in the various area of the NPP Stucture has been established.

It is necessary to develop application design technology and modular of reinforcing bar. After reviewing the rebar drawing of the NPP Stucture and performing the mock-up test, the rebar modularization method in the various area of the NPP Stucture has been established.

현재 도시시설물의 창호는 구형창호와 신형창호로 구분될 수 있다. 2006년 창호시방의 개정과 함께 기존의 알루미늄 샤시의 창호가 점차 PVC 시스템 창호로 변경되었다. 또한, 2006년을 기준으로 아파트 발코니 확장이 허용되면서 기존에 내풍설계 과정 없이 임의로 설치되던 발코니 창호가 건축물 풍하중 기준 및 창호설계 기준에 따라 설계과정을 거쳐 설치하게 되었다. 이에 따라 강풍에 의한 창호의 피해를 예측하기 위해서는 창호시스템에 대한 취약도의 평가가 필요하며 이를 위해 창호의 내풍저항 성능평가가 요구된다. 기존 창호시스템 내풍저항성능평가 연구에서는 창호타입별로 창호를 구성하는 세부저항요소를 구분하고 각각의 요소에 대한 구조실험 또는 기존문헌자료를 통해 내풍저항성능을 평가하였다. 세부저항요소별 저항성능 데이터를 바탕으로 몬테카를로 시뮬레이션을 통해 창호타입별 내풍저항성능을 확률적으로 도출하였다. 본 연구에서는 기본연구결과 중 구형창호와 신형창호 각 1개 타입에 대한 창호의 실대형 Mock-up 실험을 실시하여 기존 평가 결과와 비교하여 실제로 조합된 창호시스템의 내풍저항 성능을 평가하였다.

The mock-up test was carried out to evaluate applicability of unmanned coating method to prevent asbestos scattering from fiber insulation board in same vibration condition of school. Fiber insulation boards were cut into uniform size and attached in checker figure. Bang machine and rubber hammer were used to scatter asbestos sufficiently. Sodium silicate was used as a asbestos scattering inhibitor. The asbestos concentration was counted by PCM (Phase Contrast Microscope) and TEM (Transmission Electron Microscope). Asbestos concentration was 0.014 (1st day) and 0.021 (14th day) f/cm3, respectively in case of without coating. Asbestos concentration was 0.006 (1st day) and 0.008 (14th day) f/cm3, respectively in case of unmanned coating method. It was satisfied the standard of asbestos concentration in indoor air quality management law. So unmanned coating method was applicable to prevent asbestos scattering from fiber insulation board in buildings.

Heat insulator materials can be classified inorganic and organic. The organic material is due to toxic gas emission, when a fire occurs. And it has lower water resistance. The inorganic material is heavy and worse thermal performance than organic materials. This study focused on evaluation of the physical properties of light-weight inorganic foam panel for using industrial by-products materials and performance evaluation by mock up test.

본 연구는 최근 지반공학 기술의 발전에 따라 성토제체의 자중을 가볍게 하기 위한 방안의 일환으로 화력발전소에서 발생되는 다공성의 바텀애시를 골재로 활용한 모르타르 슬러리 내부에 기포를 혼합한 경량성토공법의 활용성을 평가하고자 하였다. 개발한 경량성토층을 연약지반의 상부에 적용하였을 때 지반거동을 관측하기 위하여 모형시험기를 제작하였으며, 단계적으로 하중을 증가시켜 지반의 거동과 변형값을 측정하였다. 또한, 연약지반 현장에서 실용화되고 있는 표층고화공법과 침하량, 지반융기량, 한계하중값을 비교함으로써 개발한 기술의 효과를 비교, 검토하였다. 모형시험을 통한 관측결과, 타 연약지반처리공법과 달리 본 성토는 강도가 높아 지반변형 크기는 작은 반면 지반변형의 영역은 넓은 것으로 나타났으며, 하중-침하량과 융기량이 기존 표층고화공법에 비해 작게 나타나고 있어 연약지반 활용에 효과적인 것으로 평가되었다.