Journal
INTERNATIONAL JOURNAL OF IMPACT ENGINEERING
Volume 125, Issue -, Pages 107-116Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijimpeng.2018.11.003
Keywords
Dynamic increase factor; Split Hopkinson pressure bar; Maximum aggregate size; Concrete compressive strength; Standard test method
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Funding
- BK21 PLUS research program of the National Research Foundation of Korea
- Infrastructure and Transportation Technology Advancement Research Program - Ministry of Land, Infrastructure and Transport of Korean government [18CTAP-C129906-02]
- National Research Foundation of Korea (NRF) - Korea government [NRF-2017R1A2B2003640]
- Institute of Construction and Environmental Engineering at Seoul National University
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Dynamic increase factor (DIF) is a measure of the rate effect in the analysis and design of structures subjected to impact or impulsive loads. A variety of DIFs have been suggested based on the results of split Hopkinson pressure bar (SHPB) tests, which is the test technique most commonly used to obtain dynamic material properties. However, due to the lack of a standard test method and some limitations in the SHPB equipment, most SHPB tests have been conducted for mortar or concrete specimens containing small size coarse aggregate that is very different from the actual concrete used in construction. The DIFs that are provided in most structural design codes are based on these test results. Therefore, it is necessary to investigate the effect of coarse aggregate size on the dynamic concrete compressive strength. In this study, a series of SHPB tests were conducted for mortar and concrete specimens with various maximum aggregate sizes. The test results indicated that the larger maximum coarse aggregate sizes induce larger heterogeneity of specimens. On the other hand, the pure rate DIFs did not exhibit a dependency on the maximum coarse aggregate size. Based on these results, guidance as to the maximum coarse aggregate size of concrete specimens for SHPB tests is provided.
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