Abstract:
In order to investigate the effect of embedded depth on the bond property between jute yarn and cement matrix, pull-out tests of jute yearns from the cement matrix were conducted by utilizing a Criterion 43 electromechanical universal test system. Correlations between mechanical parameters (pullout stiffness, peak pullout load, equivalent bond strength and work of pullout force) and embedded depths were obtained through the tests. Samples with four different embedded depths (20 mm, 40 mm, 60 mm and 80 mm) were tested at a constant displacement rate of 6 mm/min. The experimental results show that pullout stiffness decreases in spite of local undulation happened as embedded depth increases, while peak pullout load increases initially and then tends to be stable when the embedded depth is larger than 60 mm, and equivalent bond strength decreases with the increasing of embedded depth, and work of pullout force increases initially but then turns to decrease sharply at the embedded depth of 60 mm. Tested samples with different embedded depths were observed for the purpose of investigating the mechanisms of this variation further, through which the correlation between failure modes and embedded depths was obtained.