120MPa 고성능 강섬유 시멘트 복합체의 압축, 인장, 휨 및 전단 특성

Abstract

Compressive, Tensile, Bending and Shear Characteristics of 120MPa High Performance Steel Fiber Cement Composites Yang Jin Young Advisor : Prof. Cho Chang-Geun, Ph.D. Department of Architectural Engineering, Graduate School of Chosun University In this study, in order to solve problems such as brittle behavior of general concrete and weak properties on the impact of the external environment, a high-performance fiber cement composite mixing design was proposed by utilizing fiber cement composite according to the mixing ratio of steel fibers. To verify the high performance, high durability, and high fluidity of the proposed mixing design, mechanical experiments of fiber cement composite according to steel fiber mixing ratio were performed and basic data were secured. The fiber cement composite is a cement composite mixing fiber. If fibers are mixed with general concrete mixing, sufficient performance cannot be secured due to the lack of viscosity of concrete. In order to secure sufficient performance, a combination of high-strength concrete is required. In addition, performance is affected by the type, mixing rate, arrangement, etc. of fibers. Due to the material characteristics of irregular concrete, the performance is affected by the mixing when pouring concrete and the capacity of the mixed mixture. Therefore, mechanical data and basic studies are needed to utilize a high-performance fiber cement composite mixed with fibers. In this study, a combination of fiber cement composites mixed with steel fibers was proposed using a high-strength concrete combination. The mixing ratio of steel fibers were planned as 0.0%, 0.5%, 1.0%, 1.5%, and 2.0%. It has high compression and tensile strength, and has high toughness and high ductility properties. In addition, it has a dense structure to have high resistance to the effects of external environments such as carbonation, salt dissolution, and freeze melting. At the same time, fluidity was high, so mixing was minimized and excellent workability was achieved. In order to verify the performance of the mix proposed in this study, mechanical experiments such as slump flow, compression, tension, bending tension, and shear according to the steel fiber mixing ratio were performed. Based on the results of the mechanica experiment, it was confirmed that the mechanical performance of the fiber cement composite was improved when steel fibers were mixed. In addition, it behaves in the form of ductility failure, and due to its high fluidity, the performance of high performance, high durability, and high fluidity was confirmed. Through this, it is believed that sufficient basic data have been secured. It is believed that research and development through experiments are necessary by applying this to structural members.