期刊
CEMENT & CONCRETE COMPOSITES
卷 34, 期 10, 页码 1114-1123出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.cemconcomp.2012.08.004
关键词
Hybrid; Fiber reinforcement; Tensile properties; Cementitious composite; Material design; Cracking process
资金
- Portuguese National Science Foundation [SFRH/BD/36515/2007]
- POPH-QREN
- Social European Fund
- MCTES
- DTU-Byg
- Fundação para a Ciência e a Tecnologia [SFRH/BD/36515/2007] Funding Source: FCT
The simultaneous use of different types of fibers as reinforcement in cementitious matrix composites is typically motivated by the underlying principle of a multi-scale nature of the cracking processes in fiber reinforced cementitious composites. It has been hypothesized that while undergoing tensile deformations in the composite, the fibers with different geometrical and mechanical properties restrain the propagation and further development of cracking at different scales from the micro- to the macro-scale. The optimized design of the fiber reinforcing systems requires the objective assessment of the contribution of each type of fiber to the overall tensile response. Possible synergistic effects resulting from particular combinations of fibers need to be clearly identified. In the present study, the evaluation of the response of different fiber reinforced cementitious composite materials is carried out by assessing directly their tensile stress-crack opening behavior. The efficiency of hybrid fiber reinforcements and the multi-scale nature of cracking processes are discussed based on the experimental results obtained, as well as the micro-mechanisms underlying the contribution of different fibers to bridge cracks resulting from tensile loading. (c) 2012 Elsevier Ltd. All rights reserved.
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