Скачать или смотреть Assessment of Fiber Reinforced Cement Composites for Structural Uses

Presented By: Minoru Kunieda, Gifu University
A number of Ultra High Performance Fiber Reinforced Cement Composites (UHPFRC) have been developed, with their applications progressively increasing. These now include research anticipating shear strengthening and enhancement of fatigue resistance, in addition to tensile strengthening using short fibers. Based on their results, applications of UHPFRC are increasing, including to road bridge decks. A number of studies have also been conducted on combinations of different materials for reinforced concrete bridge decks to enhance their performance. The presentation introduces various kinds of assessment for structural use of Fiber Reinforced Concrete (FRC) includes UHPFRC. In particular, pull-out test of single fiber with different cement matrices is conducted, and meso scale analysis by means of Rigid Body Spring Model (RBSM) is demonstrated based on the pull-out test results. This approach can help to know mechanical behavior of FRC includes post cracking behavior. The presentation also reports test results focused on the restraint stress by substrate concrete to prevent shrinkage cracking in an overlay of bridge deck. Recent application by using onsite UHPFRC has a risk to induce a shrinkage crack at early age. The proposed approach can help to interpret a crack resistance potentially.