Title:
Dynamic Properties of Concrete at Moderately Elevated Temperatures
Author(s):
A. M. Weidner, C. P. Pantelides, W. D. Richins, T. K. Larson, and J. E. Blakeley
Publication:
Materials Journal
Volume:
112
Issue:
5
Appears on pages(s):
663-672
Keywords:
compression; drop hammer; dynamic increase factor; fibers; strain rate; temperature; tension
DOI:
10.14359/51687922
Date:
9/1/2015
Abstract:
Reinforced concrete is widely used to not only provide structural support but also to mitigate the effects of radiation, malevolent attacks, and dynamic accidents. Dynamic tests were performed on 102 x 203 mm (4 x 8 in.) normalweight concrete (NWC) and fiber-reinforced concrete (FRC) cylinders using a drop hammer. Dynamic splitting tension and dynamic compression tests were performed at room temperature and at 204°C (400°F). The dynamic increase factor (DIF), which is the ratio of dynamic to quasi-static strength, and the strain rate were compared to existing models. The DIF for tension and compression increased with strain rate. For compression, a DIF up to 3.2 was recorded for strain rates up to 12 s–1. For tension, a DIF up to 4.1 was recorded for strain rates up to 1.8 s–1. Heated NWC and FRC specimens had lower DIFs compared to room-temperature specimens for dynamic compression and tension. The experimental DIFs followed closely the Modified Comité Euro-International du Béton (CEB) model for tension.
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