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首页> 外文会议>Concrete Science and Engineering A Tribute to Arnon Bentur International RILEM Symposium; 20040324; Evanston,IL; US >DUCTILITY OF HIGH PERFORMANCE CEMENTITIOUS COMPOSITES
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DUCTILITY OF HIGH PERFORMANCE CEMENTITIOUS COMPOSITES

机译：高性能水泥基复合材料的延性

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摘要

Very high strength cementitious composites are known to be very brittle and fiber reinforcement is often proposed as a solution to increase their ductility. In the current study, very high strength cementitious composites with extremely high ductility were developed, using up to 9% steel fibers (by volume) while maintaining a workable mix. Three types of fiber were used, either alone or in a hybrid form: Macro-size fiber: high strength hooked ends (1 = 30 mm), Meso-size fiber: high strength straight (1 = 6 mm), and Micro-size fiber: high strength -25μm thick flat fibers (1 = 5 and 15 mm). High flexural strength of about 40 MPa was achieved in most of the composites, combined with enhanced ductility and strain hardening behavior. When only micro-size fibers were used the strain hardening behavior was limited and soon after attaining the peak load, a drop in load occurred. Hybrid reinforcement combining macro with meso-size fibers, at a total volume of ～6%, yielded approximately the same flexural strength but with improved ductility in the post-peak zone. It appears that hybridization of different types of fibers, with each one contributing at a different level of strain and crack opening can optimize the properties of the composite.
机译：已知非常高强度的胶结复合材料非常脆，并且通常提出纤维增强作为增加其延展性的解决方案。在当前的研究中，开发了具有极高延展性的超高强度水泥基复合材料，使用了高达9％的钢纤维（按​​体积计），同时保持了可行的混合物。单独使用或混合使用三种类型的纤维：大型纤维：高强度钩状端头（1 = 30 mm），中型纤维：高强度直管（1 = 6 mm）和微型纤维纤维：高强度-25μm厚的扁平纤维（1 = 5和15 mm）。大多数复合材料均获得了约40 MPa的高抗弯强度，同时增强了延展性和应变硬化性能。当仅使用微米尺寸的纤维时，应变硬化行为受到限制，并且在达到峰值负荷后不久，负荷就会下降。混合增强材料将宏观与中等尺寸的纤维结合在一起，总体积约为6％，产生了几乎相同的抗弯强度，但在峰后区域具有改善的延展性。看来，不同类型的纤维的杂交，使每种纤维在不同程度的应变和开裂中起作用，可以优化复合材料的性能。

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