| Title |
Influence of Types and Replacement Levels of CSA Expansive Admixture on Mechanical Properties of Fiber-reinforced Cement-based Composite |
| Authors |
Ryu Seung-Hyun ; Kim Jong-Pil ; Lee Young-Oh ; Yun Hyun-Do |
| Keywords |
Expansive Admixture ; Fiber-reinforced Cement-based Composite(FRCC) ; Shrinkage ; Mechanical Properties |
| Abstract |
This paper discusses the results of an investigation on the influence of calcium sulfoaluminate (CSA) based expansive admixtures (EXA) on the mechanical and cracking properties of fiber-reinforced cement-based composite (FRCC). The specific compressive strength of FRCC matrix was 70 MPa and this FRCC matrix was reinforced with 1.5% polyethylene fibers (PE) by volume fraction. Two independent variables such as EXA type (Type-1 and Type-2) and percentages of EXA as cement replacement (0, 8, 10, 12 and 14% by mass) were used for the design of FRCC mixtures. The mechanical properties of FRCC such as uniaxial tensile, flexure, and compressive properties, as well as crack development and shrinkage behavior were evaluated to examine the effects of EXA on the performance of FRCC. The results indicated that 8 to 10% replacement of EXA could significantly increase compressive, flexural and tensile strength of FRCC manufactured in this study. In addition to its efficient shrinkage reducing effect, it was observed that 8 to 10% of EXA content decreased initial shrinkage cracking and induced multiple and narrow cracks in the FRCC specimen under flexure and direct tension properties. |