応力波プロファイル測定によるコンクリートの衝撃応答評価

抄録

Concrete is the most basic structure materials and it is used for various structures. Therefore, many impact experiments have been performed so far. However, most of experiments have been performed for only normal strength concrete. In this study, shock experiments have been performed to investigate the shock response of ultra-high-strength concrete. The stress wave profiles propagating into the impacted concrete are directly measured by using PVDF stress gauges embedded in specimen. The compression-release paths under shock loading are derived from the measured stress wave profiles. The longitudinal stress profiles show the formation of precursor wave associated with the compaction of pores. Compression paths derived from wave propagation profiles indicate that the pores of this material are fully compacted by the dynamic compression stress of about 1 GPa. The derived loading-unloading paths also show large hysteresis. These results indicate that the large part of the work by shock-loading is consumed by the collapse of the pores inside concrete.