期刊
CEMENT & CONCRETE COMPOSITES
卷 31, 期 4, 页码 232-243出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.cemconcomp.2009.02.006
关键词
Natural fibers; Cementitious matrices; Resistance-curve behavior; Fatigue crack growth; Crack-bridging
资金
- Division of Civil and Mechanical Systems (CMS)
- Division of Materials Research of the National Science Foundation [CMS 0303492, DMR 0231418]
- National Council for Scientific and Technological Development (CNPq)
- Co-ordination for the Improvement of Higher Education Personnel (Capes)
This paper presents the results of an experimental study of resistance-curve behavior and fatigue crack growth in cementitious matrices reinforced with eco-friendly natural fibers obtained from agricultural by-products. The composites include: blast furnace slag cement reinforced with pulped fibers of sisal, banana and bleached eucalyptus pulp, and ordinary Portland cement composites reinforced with bleached eucalyptus pulp. Fracture resistance (R-curve) and fatigue crack growth behavior were studied using single-edge notched bend specimens. The observed stable crack growth behavior was then related to crack/microstructure interactions that were elucidated via scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS). Fracture mechanics models were used to quantify the observed crack-tip shielding due to crack-bridging. The implications of the results are also discussed for the design of natural fiber-reinforced composite materials for affordable housing. (C) 2009 Elsevier Ltd. All rights reserved.
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