Effect of Traffic Induced Vibrations at Early Concrete Ages on Concrete Tensile Strength

摘要

When bridges are repaired or widened, it is often required to maintain traffic without interruption and as a result the curing repaired concrete would be subjected to traffic induced vibration. The purpose of the test performed in this study is to testify whether the traffic induced vibrations that occurred during the period between initial set and final set would affect the attainable tensile strength of the concrete. The test program consists of casting 228 100 mm by 100 mm concrete cube specimens and subjecting them to four combinations of frequency and amplitude vibrations for 30 minutes at six different ages ranging in time from before, during, and after the setting period for the concrete. The splitting tensile tests are performed at concrete curing age 1, 3 and 28-days respectively, and 76 splitting tensile strength results are acquired. The results of the test indicate that traffic induced vibrations should not be considered a significant hazard to concrete tensile strength in this study.