增强混凝土结构BFRP湿热环境下耐碱性试验研究

发布时间：2018-05-25 13:49

  本文选题：BFRP筋 + 体积收缩　； 参考：《东南大学》2016年硕士论文

【摘要】：在自然环境下,海洋是最苛刻的腐蚀环境之一,海工结构要经受海水、海洋大气或更为严酷的飞溅区、潮差区的腐蚀,而普通钢材在海洋环境中极易腐蚀,很短的服役期内将丧失使用功能。采用FRP筋替代普通钢筋被认为是能够解决混凝土结构中钢筋锈蚀的方法之一。海洋工程中,在海水浸泡中的混凝土结构中的FRP筋处于海水的盐溶液环境和混凝土内部孔隙碱溶液的复合侵蚀环境中,受到碱盐环境侵蚀性能发生退化。为了研究混凝土中BFRP筋耐久性。本文模拟了海洋环境盐溶液和混凝土孔隙碱溶液共同作用的复合环境,采用实验室55℃加速浸泡进行FRP筋碱盐侵蚀试验研究。乙烯基树脂体积收缩较大、环氧树脂韧性较差,本文对D430乙烯基树脂加入三种不同质量比的PE(聚乙烯),结果能有效减少其体积收缩率。聚丙二醇二缩水甘油醚(PPGDGE)能显著提高E51环氧树脂的韧性。PE粉的加入能提高D430在碱盐溶液中的耐久性。PPGDGE增韧剂降低了环氧树脂耐久性。BV筋耐腐蚀优于酸酐类固化剂固化的BE筋；PE粉的加入能能提高B430筋耐腐蚀性能；BE筋中加入5%PPGDGE能提高耐腐蚀性能,过量的PPGDGE将降低BE筋耐腐蚀性能；BFRP筋耐腐蚀性能与筋材表面肋深无关,与肋的形成工艺有关；BFRP筋表面涂覆层在湿热环境下容易破坏,不能提高BFRP筋耐腐蚀性能。对比BFRP筋各腐蚀龄期拉伸和剪切强度保留率：BFRP筋剪切强度保留率大于拉伸强度保留率；BV筋同腐蚀龄期拉伸与剪切强度保留率差异性较小,BE筋拉伸与剪切强度保留率差异较大。
[Abstract]:In the natural environment, the ocean is one of the most severe corrosion environments. The marine structure is subject to the corrosion of sea water, ocean atmosphere or even more severe splash area, tidal zone, while ordinary steel is easy to corrode in the marine environment. Use will be lost during a short service period. The use of FRP bars instead of ordinary steel bars is considered to be one of the methods to solve the corrosion of steel bars in concrete structures. In marine engineering, the FRP bars in the concrete structure in seawater immersion are in the environment of salt solution in seawater and the complex eroding environment of alkali solution in the pore of concrete, and the erosive performance of the concrete is degraded by alkali salt. In order to study the durability of BFRP bars in concrete. In this paper, the combined environment of salt solution and concrete pore alkali solution in marine environment is simulated. The experimental study of FRP bar alkali salt erosion is carried out by accelerated immersion at 55 鈩，

本文编号：1933343