Experimental findings pertaining to the frost resistance of calcium sulfoaluminate (CSA) and amorphous calcium aluminate (ACA) cement-based repair mortars incorporated with anhydrite gypsum are described herein. To prepare the mortars, CSA and/or ACA cements were used as binders, and the water–binder ratio was fixed at 0.57. The compressive and bond strengths, chloride-ion penetration resistance, and scaling resistance of the mortars were measured. Based on the ASTM C666 method, the resistance to both frost action and multi-deterioration of chloride and frost attacks on the mortars were experimentally examined. Calcium aluminate-based binders effectively enhanced the compressive and bond strengths of the mortars owing to the formation of C2AH8 and Ye’elimite hydrates. Furthermore, replacing 25% ACA with OPC yielded excellent resistance to both frost attack and multi-deterioration of chloride and frost attacks. Replacing ACA at an appropriate level as a binder effectively improves the durability of concrete road facilities in winter.

The purpose of this study is to present a method that can estimate the height of reaction facilities for large structural experiment through load flow as primary design procedure. The characteristic of the load transmission according to the type of experiment was analyzed to obtain tensile and compressive forces occurring on the reaction facilities. Strong walls that are affected by the bending moment is applied the post-tensioning method, and the strong floor under the control of the tension and compression is designed in accordance with the load flow. And the optimum cross-section of the reaction facilities was obtained by comparing the stresses of the tensile stress and crack the concrete. Through validating elastic analysis, the design results were satisfied a given design conditions.

In the research-oriented university there are various laboratories in the departments according to a major field of study Under these circumstances the budget to purchase experimental facilities has only to be distributed among research teams and then is

최근 교통 표지판, 차막이 등 여러 안전시설물 등에 시인성을 겸비한 재료를 이용하여 발광기능 뿐만 아니라 유도기능을 부여하는 사례가 많이 늘고 있다. 그러나 이러한 발광재료의 무분별한 과다사용은 인간의 시선을 방해할 수도 있다. 그러므로 인지 가능한 최소한의 빛의 밝기를 확보함과 동시에 사용 목적에 맞는 적절한 발광재료 또는 발광재료의 배치를 적용할 필요성이 있다. 본 논문에서는 인간이 인지할 수 있는 최소한의 빛의 광도를 측정하기 위해 휘도(조사면적당 광도, cd/m2) 측정기를 사용하여 휘도를 측정하였다. 광원에서 15m 떨어진 거리에서 주황색과 파랑색 두 가지 색에 대한 인지 가능여부 실험을 수행하였다.