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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) >NON METALLIC (MCP) FIBER REINFORCED CONCRETE: MECHANICAL CHARACTERIZATION AND SLABS ON GRADE DESIGN ASPECTS
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NON METALLIC (MCP) FIBER REINFORCED CONCRETE: MECHANICAL CHARACTERIZATION AND SLABS ON GRADE DESIGN ASPECTS

机译：非金属（MCP）纤维增强混凝土：等级设计方面的机械特性和平板

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摘要

Fiber Reinforced Concrete (FRC) is widely used for elements of secondary structural importance (slabs on grade, tunnels, railway superstructures). Steel fibers are the most commonly adopted. However, at high fibers volume ratios, some difficulties could be found in obtaining a good homogeneity of the steel fibers in the concrete matrix with consequent non-homogeneity of the material characteristics. This paper deals with experimental evaluation of flexural performances of non metallic (Modified Copolymer of Polypropylene, MCP) Fiber Reinforced Concrete (MPFRC) and related design aspects for slabs on grade. The experimental program involves splitting tests of cylindrical specimens, compression tests and four point bending tests on notched and un-notched specimens. MPFRC results of four points bending tests were compared with results of hooked Steel Fiber Reinforced Concrete (SFRC) with the same volume ratio. MPFRC specimens showed more consistent results, thus confirming the more homogeneous distribution of fibers in concrete. Different concrete strengths and fiber volume ratios were investigated. Based on the experimental results, the constitutive law of the fiber reinforced concrete is determined. The constitutive law allows slabs on grade design considerations referring to the Ultimate Limit State and Serviceability Limit State.
机译：纤维混凝土（FRC）被广泛用于具有次要结构重要性的元素（地基，隧道，铁路上部结构上的平板）。钢纤维是最常用的。然而，在高纤维体积比的情况下，在获得混凝土基体中钢纤维的良好均质性以及随之而来的材料特性非均质性方面会发现一些困难。本文针对非金属（聚丙烯改性共聚物，MCP）纤维混凝土（MPFRC）的抗弯性能进行了实验评估，并研究了有关楼板的相关设计方面。实验程序包括圆柱试样的劈裂试验，压缩试验以及有缺口和无缺口试样的四点弯曲试验。比较了四点弯曲试验的MPFRC结果与相同体积比的钩钢纤维混凝土（SFRC）的结果。 MPFRC标本显示出更一致的结果，从而确认了纤维在混凝土中的分布更加均匀。研究了不同的混凝土强度和纤维体积比。根据实验结果，确定了纤维增强混凝土的本构关系。本构法允许平板参照最终极限状态和可使用性极限状态进行坡度设计考虑。

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