期刊
CEMENT & CONCRETE COMPOSITES
卷 56, 期 -, 页码 15-24出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.cemconcomp.2014.10.002
关键词
Mechanical properties; Strain rate effect; Tensile properties; Fiber reinforcement; Ultra high-performance concrete; Cracking
资金
- National Science Foundation-United States [CMS 0928193]
- University of Michigan, Ann Arbor
The results of an experimental investigation of UHP-FRC tensile response under a range of low strain rates are presented. The strain rate dependent tests are conducted on dogbone specimens using a hydraulic servo-controlled testing machine. The experimental variables are strain rate, which ranges from 0.0001 1/s to 0.1 1/s, fiber type, and fiber volume fraction. Five different types of fibers are considered including straight and twisted fibers with different geometric properties. The rate sensitivity of the composite material in tension is evaluated in terms of its first cracking strength, post-cracking strength, energy absorption capacity, strain capacity, elastic modulus, fiber tensile stress and number of cracks. The test results show pronounced rate effects on post-cracking strength and energy absorption capacity. Further, post cracking strength varies linearly with the fiber reinforcing index and energy absorption capacity varies linearly with the product of the fiber length and the reinforcing index, as predicted from the theory for fiber reinforced concrete. (C) 2014 Elsevier Ltd. All rights reserved.
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