| Title |
A Study on Effects of Woodpulp Contents and its Characteristics on Matrix Structure and Physical Properties in Cement Composite |
| Authors |
Choi Eung-Kyoo ; Kim Ok-Kyue ; Yang Keek-Young |
| Keywords |
목재펄프함량 ; 섬유소 ; 목재펄프피브릴화 ; 시멘트복합체 ; 내부구조목재펄프함량 ; 섬유소 ; 목재펄프피브릴화 ; 시멘트복합체 ; 내부구조 |
| Abstract |
The objective of the study is to suggest a suitable woodpulp material and its optimum content applicableto carbon fiber-reinforced cement composite. Following selection of a suitable carbon fiber within a range of inorganic fiber materials, a series of experiments has been carried out to analyze the effects of varying woodpulp contents and its characteristics in cement composite with respect to physical and mechanical properties. The experiments have demonstrated that fibrin and fibril in the woodpulp play important roles in the inorganic fiber-reinforced cement composite using carbon fiber; moderates inherent brittleness: disperses fibers uniformly: maintains the consistency of the mixture. Analyzing the properties of carbon fiber-reinforced cement composite in relation to the varying contents of woodpulp, the fibrin content in the woodpulp had significant effect upon the physical properties. In addition, the degree of fibrilization of woodpulp determines the mechanical properties. In brief, softwood pulp having tougher fibers and broader fibrin with rich fibrilization demonstrated better mechanical performance in the cement matrix. Observing the interfacial failure plane, while excessive content of woodpulp in the cement matrix exhibited loose matrix structure with voids, 2.5% woodpulp content proved to be optimum showing compact matrix structure. Based on the result of the experiment, softwood pulp with rich fibrin content and well-developed fibrilization proved to be the optimum woodpulp for inorganic fiber-reinforced cement composite. Optimum physical properties were obtained at the ranges of 2.5% to 3.0% in the woodpulp content. When carbon fiber is used as reinforcingfiber, the most effective content of woodpulp in the mix to moderate brittleness of carbon fiber turned out to be approximately 3.0%. |