This experiment can maximize the decline of the heat on steel structure by using the magnesium hydroxide and aluminum hydroxide which generally used to resistant or retardant. These materials can delay a temperature rise due to the generation of vapors around the fire resistive covering, when reacting with heat by a creating moisture. Therefore, applicability of the fire resistance mortar used magnesium hydroxide and aluminum hydroxide was studied and experimented. As a result, in case of the workability is satisfied with the condition of site, but in case of the bonding strength is not satisfied with the standard with fire resistance mortar.

To evaluate the quality of the concrete cover a research project using non destructive air permeability measurements is carried out. Measurements were conducted in the laboratory as well as on concrete structures.

It will use the Schmidt hammer law, the Ultrasonic waves velocity law and the composition law in the concrete Korean mandolin lump examination law from the research which it sees consequently and proposal of the usual concrete and existing regarding the high-in-tensity concrete the comparison which will be cool it will analyze and compared to accurately the burglar presumption which is the possibility of buying the compressive strength of the concrete it will be cool and it proposes.

최근 환경문제가 이슈화됨에 따라 건설폐기물의 재활용과 순환자원의 사용을 확대해 나가고 있다. 이에 순환자원과 무시멘트 알칼리 활성제를 사용한 지오폴리머에 대한 연구를 실시하였다.

산업부산물인 폐유황의 재황용을 목적으로 개질처리된 유황을 대상으로 콘크리트용 혼화재료로써의 물성검토를 위하여 개질처리된 유황을 콘크리트에 외할 첨가하여 개질유황 첨가별 압축강도 및 내구성능을 평가한 결과를 고찰하였다.

It will use the Schmidt hammer law, the supersonic waves speed law and the composition law in the concrete Korean mandolin lump examination law from the research which it sees consequently and proposal of the usual concrete and existing regarding the high-in-tensity concrete the comparison which will be cool it will analyze and compared to accurately the burglar presumption which is the possibility of buying the compressive strength of the concrete it will be cool and it proposes.

This work was intended to test the collision of a 14-ton truck with a concrete protection wall and thus analyze fracture behavior of a protection wall. And, this work investigated fracture phenomena by modeling concrete protection walls in different levels of stress with the use of LS-DYNA. In addition, it analyzed fracture behavior of a protection wall by modelling concrete protection walls in the different installation heights of wire-mesh.

To clarify the load-carrying behavior of RC beams caused by the rebar fracture and the expansive crack along the longitudinal reinforcement due to aggregate expansion simulating ASR, experimental study was carried out. From the test result, all specimens caused by the rebar fracture failed in shear tension. Moreover, cracking behavior and crack propagation highly influenced by the range of expansive crack.

Damage evaluation of railway bridge is presented. Changes of dynamic properties between damaged case and repaired case using free vibration responses are evaluated. Power Spectrum and Cross Power Spectrum of Fourier Transform for vibration responses are used to evaluate the dynamic properties of the bridge to check out the difference before and after the reinforcement.

강상자형사교의 경우 국내의 도로교 설계기준이 갖추어지지 않아, 미국의 AASHTO 및 AASHTO LRFD 설계기준을 적용할 경우에는 실제의 거동과 다른 하중분배계수를 산출하게 되어 과대설계 및 과소설계를 초래할 가능성을 가지고 있다. 본 연구의 목적은 실제 거동을 바탕으로 한 강상자형 사교의 둔각부 지점에서의 전단력 산정을 위한 하중분배계수식을 제시하는 데 있다. 이를 위하여 본 연구에서는 강상자형 사교의 다양한 구조모델들에 대해 유한요소해석을 수행하고, 각 매개변수들이 강상자형사교의 하중분배계수에 미치는 영향을 분석한 후, 다중회귀분석을 수행하여 강상자형사교의 전단력 산정을 위한 하중분배계수식을 제시한다.