Comparative flexural behavior of four fiber reinforced cementitious composites
Comparative flexural behavior of four fiber reinforced cementitious composites
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DOI：
10.1016/j.cemconcomp.2008.08.002
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发表时间：
2008-11-01
影响因子：
10.5
通讯作者：
El-Tawil, Sherif
中科院分区：
文献类型：
--
作者：
Kim, Dong Joo;Naaman, Antoine E.;El-Tawil, Sherif
本研究研究了在名义上相同的砂浆基体（抗压强度为56 MPa）下，含有四种不同类型纤维和两种体积分数（0.4%和1.2%）的纤维增强胶凝复合材料（FRCC）的抗弯性能。这四种纤维分别是高强钢绞（T-）纤维、高强钢钩（H-）纤维、高分子量聚乙烯谱（SP-）纤维和聚乙烯醇纤维。试验按照ASTM标准进行。t纤维试件在承载能力、能量吸收能力和多次开裂行为等几乎所有方面的性能都表现最好，而pva纤维试件在各方面的性能都相对较差。sp -纤维试件优于t -纤维试件的唯一类别是挠曲能力，其中sp -纤维试件在最大载荷下表现出最大的挠曲能力。通过将测试结果与另一个测试程序的数据进行比较，该测试程序涉及使用含有H-纤维和t -纤维的更高强度砂浆（84 MPa），结果表明，t -纤维在更高强度基质中的性能明显优于H-纤维。两个试验程序的测试结果被用来批判新的ASTM标准[C 1609/C 1609M-05]，并提出了一些建议，以提高该标准对挠曲硬化frcc的适用性。(C) 2008 Elsevier Ltd版权所有
This research investigates the flexural behavior of fiber reinforced cementitious composites (FRCC) with four different types of fibers and two volume fraction contents (0.4% and 1.2%) within a nominally identical mortar matrix (56 MPa compressive strength). The four fibers are high strength steel twisted (T-), high strength steel hooked (H-), high molecular weight polyethylene spectra (SP-), and PVA-fibers. The tests were carried out according to ASTM standards. The T-fiber specimens showed best performance in almost all aspects of behavior including load carrying capacity, energy absorption capacity and multiple cracking behavior, while the PVA-fiber specimens exhibited comparatively the worst performance in all aspects of response. The only category in which SP-fiber specimens outperformed T-fiber specimens was deflection capacity, where SP-specimens exhibited the highest deflection at maximum load. By comparing the test results to data from an additional test program involving the use of a higher strength mortar (84 MPa) with both H- and T-fibers, it is shown that, again, T-fibers perform significantly better than H-fibers in a higher strength matrix. The test results from both experimental programs were used to critique the new ASTM standard [C 1609/C 1609M-05], and a few suggestions were made for improving the applicability of the standard to deflection-hardening FRCCs. (C) 2008 Elsevier Ltd. All rights reserved