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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) >DURABILITY OF GLASS FIBRES
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DURABILITY OF GLASS FIBRES

机译：玻璃纤维的耐久性

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摘要

Main concern of glass fibre reinforced concrete (GFRC) is the durability of glass fibres in the alkaline environment. In present study the alkali resistant fibres themselves were kept in extreme alkaline environmental condition. Purpose of our accelerated aging test was to study the possible deterioration processes and the reasons of the bond capacity increase in addition to the decrease of strength and ductility followed by the embrittlement of fibres. Fibres were immersed either in saturated calcium-hydroxide solution or cement extract solution for 8 days at 70℃, and in saturated calcium-hydroxide solution for 56 days at 70℃, respectively. The latter exposure condition was so strong that it could not necessarily happen during the whole service life embedded in concrete. We observed that one type of the coatings debonded, then holes started to appear on the surface of fibres as parts of the deterioration process. The other type of coating did not debond, however, holes appeared in the coating. Crystals originating from the Ca(OH)_2 agent penetrate into the fibre strand. Deterioration process may lead to forming CSH phases. These may contribute to the observed increase of bond capacity.
机译：玻璃纤维增​​强混凝土（GFRC）的主要问题是玻璃纤维在碱性环境中的耐久性。在本研究中，耐碱性纤维本身被保持在极端碱性环境条件下。我们加速老化测试的目的是研究可能的劣化过程以及粘结强度增加的原因，以及强度和延展性下降以及随后的纤维脆化。将纤维分别在70°C的饱和氢氧化钙溶液或水泥浸膏溶液中浸泡8天，在70°C的饱和溶液中浸泡56天。后一种暴露条件是如此之强，以至于在嵌入混凝土的整个使用寿命中都不一定会发生。我们观察到一种类型的涂层剥离，然后在纤维表面开始出现孔洞，这是劣化过程的一部分。另一类涂料没有脱粘，但是在涂料中出现了孔。源自Ca（OH）_2剂的晶体渗透到纤维束中。劣化过程可能导致形成CSH相。这些可能有助于观察到的结合能力的增加。

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