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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) >PREDICTION OF LIFETIME OF ALKALI-RESISTANT GLASS FIBRES IN CEMENTITIOUS CONCRETES
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PREDICTION OF LIFETIME OF ALKALI-RESISTANT GLASS FIBRES IN CEMENTITIOUS CONCRETES

机译：胶结混凝土中耐碱玻璃纤维寿命的预测

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摘要

Alkali resistant (AR)-glass fibres are produced not only for short fibre reinforcement but also for textile made two- or even three-dimensional reinforcement units. In all cases of use the durability of the fibres is affected by the high alkali environment in cementitious concrete as well as by the very complex crack bridging behaviour of the fibres which consist each of a large number of very thin filaments. Using an Environmental Scanning Electron Microscope (ESEM) the results of damage processes are shown. A prediction method for the progress of damages has been developed. Based on ESEM-observations an adhesive cross-linkage model has been created by the authors which allows a very well description of the complex bond behaviour of textile glass fibre reinforcement and concrete, and the prediction of the consequence of damages in bond behaviour due to corrosion processes. In the adhesive cross-linkage model all filaments are bond to each other by a pattern of adhesive cross-links consisting of binder particles, e.g. hydration products of cement. The model allows generally a numerical prediction of either the stress distribution in all filaments of a fibre cross section as well as the typical successive cracking of single filaments due to increasing crack width.
机译：耐碱（AR）玻璃纤维不仅用于短纤维增强，而且还用于织物制造的二维或什至三维增强单元。在所有使用情况下，纤维的耐用性都受到水泥混凝土中高碱环境以及纤维的非常复杂的裂缝桥接行为的影响，纤维由许多非常细的细丝组成。使用环境扫描电子显微镜（ESEM）显示了损坏过程的结果。已经开发了损害进度的预测方法。基于ESEM的观察，作者创建了一个粘合剂交联模型，该模型可以很好地描述纺织玻璃纤维增​​强材料和混凝土的复杂粘结行为，并预测由于腐蚀造成的粘结行为受损的后果流程。在粘合剂交联模型中，所有的长丝通过由粘合剂颗粒组成的粘合剂交联图案（例如，粘合剂颗粒）彼此粘合。水泥的水合产物。该模型通常允许对纤维横截面的所有细丝中的应力分布以及由于裂纹宽度增加而导致的单根丝的典型连续裂纹进行数值预测。

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