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Distribution of fibers in SFRC segments for tunnel linings

机译：SFRC隧道衬砌中纤维的分布

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摘要

This paper presents research results regarding the distribution of steel fibers in concrete used to build precast tunnel segments for Line 9 of the Barcelona Metro. The fiber distribution was studied using the actual fiber contents obtained by means of crushed cores drilled from different points of three full-scale tunnel lining segments. A statistical analysis determined that the fiber content in the ends of segments tends to be greater than in the central zone. The way of transporting, pouring and compacting concrete influences the fiber content and the fiber distribution across the thickness of the segment. In addition, cores with a diameter of 150 mm were found to have a lower scatter in the fiber content than smaller diameter specimens. Finally, based on probabilistic approaches, a minimum of 11 cores is proposed to control the fiber content in FRC segments. (C) 2015 Elsevier Ltd. All rights reserved.
机译：本文介绍了有关用于巴塞罗那地铁9号线预制隧道段的混凝土中钢纤维分布的研究结果。使用通过从三个全尺寸隧道衬砌段的不同点钻取的压碎芯获得的实际纤维含量研究纤维分布。统计分析确定，线段末端的纤维含量往往大于中心区域的纤维含量。混凝土的运输，浇筑和压实方式会影响纤维含量和整个段厚度的纤维分布。另外，发现直径为150 mm的纤芯比较小直径的试样具有更低的纤维含量散布。最后，基于概率方法，提出了最少11个纤芯来控制FRC段中的纤维含量。 （C）2015 Elsevier Ltd.保留所有权利。

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