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首页> 外文会议>RILEM Proceedings PRO 39; RILEM Symposium on Fibre-Reinforced Concretes(FRC) - BEFIB 2004 vol.1; 20040920-22; Varenna(IT) >CEMENTITIOUS COMPOSITES WITH HIGH TENSILE STRENGTH AND DUCTILITY THROUGH HYBRID FIBRES
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CEMENTITIOUS COMPOSITES WITH HIGH TENSILE STRENGTH AND DUCTILITY THROUGH HYBRID FIBRES

机译：通过混合纤维具有高抗拉强度和延展性的胶结复合材料

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摘要

Increasing the tensile strength and ductility is the aim of hybrid fibre concretes (HFC). Actively interfering with the microcrack process and with macrocrack growth is required to achieve these goals. The addition of fibres resembles the use of external active confinement. The fibre cocktails must be selected such that (1) the microcrack length is minimized as long as possible, and (2) the bridging of the cracks must be such that no sudden large deformations develop during (macro) crack growth. The fibres must effectively withstand loss of load carrying capacity from the concrete itself. Finally the mixtures must be self-compacting to ensure that proper fibre distributions are obtained. Nevertheless since structural shape and flow properties of the mixtures determine the ultimate fibre distribution, standard test methods must be designed so that the material is tested as it appears in the structure. HFC seems particularly suitable for the pre-cast concrete industry, where the higher demands for quality control can be met. Optimization of the placement of the material in structures with given shape may lead to the best structural behaviour, while minimizing the use of the material. Examples of applications are long-span lightweight girders, sheet-piling, etc. Reducing conventional (and expensive) steel reinforcement can be achieved. Moreover, since HFC displays a clear hardening behaviour, the widths of cracks are very small, which positively affects durability. The high cement content is a favourable factor in this respect as well, since self-healing of microcracks can help to ensure durability for extended periods.
机译：提高抗张强度和延展性是混合纤维混凝土（HFC）的目标。要实现这些目标，需要积极干预微裂纹过程和大裂纹的增长。纤维的添加类似于外部主动限制。纤维混合物的选择必须使得（1）尽可能缩短微裂纹的长度，以及（2）裂纹的桥接必须使得在（宏观）裂纹生长期间不会出现突然的大变形。纤维必须有效地承受混凝土本身的承载能力损失。最后，混合物必须是自密实的，以确保获得适当的纤维分布。然而，由于混合物的结构形状和流动特性决定了最终的纤维分布，因此必须设计标准的测试方法，以便对材料在结构中的出现进行测试。氢氟碳化合物似乎特别适合可以满足更高质量控制要求的预制混凝土行业。在具有给定形状的结构中优化材料的放置可能会导致最佳的结构性能，同时最大程度地减少材料的使用。应用实例是大跨度的轻型大梁，板桩等。可以减少传统的（且昂贵的）钢筋。此外，由于HFC表现出清晰的硬化行为，所以裂纹的宽度非常小，这对耐久性有积极的影响。在这方面，高水泥含量也是一个有利因素，因为微裂纹的自我修复可以帮助确保长时间的耐用性。

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