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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) >MULTI-MECHANISM DESIGN CONCEPT FOR DEVELOPING HIGHLY DUCTILE CEMENTITIOUS COMPOSITES
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MULTI-MECHANISM DESIGN CONCEPT FOR DEVELOPING HIGHLY DUCTILE CEMENTITIOUS COMPOSITES

机译：开发高韧性胶凝复合材料的多机理设计概念

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摘要

Development of highly ductile cementitious composites is one of the key issues for further advances in concrete structures. Two alternative design approaches to create highly ductile cementitious composites are presented. Both of them rely on multiple mechanisms to steadily counterbalance distinct properties of matrix fracture and fiber debonding resistance. The first design concept is based on uniform distribution of flaws, or artificial microcracks, to reduce fracture toughness of the matrix and attain certain homogenization. While this may reduce bonding strength, it can improve tensile ductility by increasing energy consumption in debonding larger number of polymeric fibers. The second design concept makes use of rational combination of polymeric and steel cord fibers for multistage balance of properties along cracking development to improve fracture toughness. Multiple mechanisms are essential to increase strain energy consumption and promote a significant pseudo-strain-hardening, which imparts desirable tensile ductility to concrete structures. Rational design concepts need to be clearly defined in order to allow for utilization of advanced cementitious materials in practice.
机译：高延展性水泥基复合材料的开发是混凝土结构进一步发展的关键问题之一。提出了两种可替代的设计方法来制造高韧性水泥基复合材料。它们都依靠多种机制来稳定地平衡基质断裂和纤维抗粘结性的不同特性。第一个设计概念基于缺陷或人工微裂纹的均匀分布，以降低基体的断裂韧性并实现一定的均质化。虽然这可能会降低粘合强度，但可以通过增加释放大量聚合物纤维时的能耗来提高拉伸延展性。第二个设计概念是将聚合物纤维和钢丝帘线纤维合理地结合在一起，以便在裂缝发展过程中实现多阶段的性能平衡，从而提高断裂韧性。多种机制对于增加应变能消耗和促进显着的伪应变硬化至关重要，这可为混凝土结构提供理想的拉伸延展性。需要明确定义合理的设计概念，以便在实践中使用先进的水泥材料。

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