CUEVAS SANDOVAL JULIO CESAR

鋼材と樹脂モルタルとの接着強度とその管理方法に関する研究

高橋　修

One of the methods used to control road unevenness is the flexible footing slab, which consists of asphalt concrete and its reinforcing material. This method uses steel hexagonal lattice panels and asphalt mixture to construct flexible footings at the boundary between the earthwork and the abutment. In the event of settlement of the earthwork, the flexible footing slab, which is anchored to the abutment parapet by steel and anchor bolts, prevents settlement and allows traffic to pass.

One of the main issues about this method is that until now strength control has been done empirically; it is known that the degree of hardening of resin mortar varies considerably depending on temperature conditions. Therefore, in this study, a one-surface shear test was conducted to investigate how the bond strength between the resin mortar and the same metal surface as the unequal-surface steel varies with curing time and temperature. 

Since the resin mortar begins to cure immediately after mixing, timekeeping was started after mixing and the adhesion strength was measured at each elapsed time. Curing times were 90, 120, 150, 180, and 210 minutes. The curing temperatures were set at 10°C, 20°C, and 30°C. The curing conditions and color tone of the resin mortar were also observed at each curing time.
After a thorough evaluation it was found that shear stress increased with increasing temperature and curing time. Although the trend of strength development was expected from the nature of the resin mortar, the value of shear stress as strength is a useful result, indicating that after 150 minutes, the resin mortar stabilizes in a specific range of values, depending on the temperature. Finally, it was also found that the color tone does not change much at each temperature. However, it is important to continue this research by expanding the environmental and curing conditions in order to obtain more reliable data.