發(fā)布時(shí)間：2018-05-25 13:49

  本文選題：BFRP筋 + 體積收縮��； 參考：《東南大學(xué)》2016年碩士論文

【摘要】：在自然環(huán)境下,海洋是最苛刻的腐蝕環(huán)境之一,海工結(jié)構(gòu)要經(jīng)受海水、海洋大氣或更為嚴(yán)酷的飛濺區(qū)、潮差區(qū)的腐蝕,而普通鋼材在海洋環(huán)境中極易腐蝕,很短的服役期內(nèi)將喪失使用功能。采用FRP筋替代普通鋼筋被認(rèn)為是能夠解決混凝土結(jié)構(gòu)中鋼筋銹蝕的方法之一。海洋工程中,在海水浸泡中的混凝土結(jié)構(gòu)中的FRP筋處于海水的鹽溶液環(huán)境和混凝土內(nèi)部孔隙堿溶液的復(fù)合侵蝕環(huán)境中,受到堿鹽環(huán)境侵蝕性能發(fā)生退化。為了研究混凝土中BFRP筋耐久性。本文模擬了海洋環(huán)境鹽溶液和混凝土孔隙堿溶液共同作用的復(fù)合環(huán)境,采用實(shí)驗(yàn)室55℃加速浸泡進(jìn)行FRP筋堿鹽侵蝕試驗(yàn)研究。乙烯基樹脂體積收縮較大、環(huán)氧樹脂韌性較差,本文對(duì)D430乙烯基樹脂加入三種不同質(zhì)量比的PE(聚乙烯),結(jié)果能有效減少其體積收縮率。聚丙二醇二縮水甘油醚(PPGDGE)能顯著提高E51環(huán)氧樹脂的韌性。PE粉的加入能提高D430在堿鹽溶液中的耐久性。PPGDGE增韌劑降低了環(huán)氧樹脂耐久性。BV筋耐腐蝕優(yōu)于酸酐類固化劑固化的BE筋；PE粉的加入能能提高B430筋耐腐蝕性能；BE筋中加入5%PPGDGE能提高耐腐蝕性能,過量的PPGDGE將降低BE筋耐腐蝕性能；BFRP筋耐腐蝕性能與筋材表面肋深無關(guān),與肋的形成工藝有關(guān)；BFRP筋表面涂覆層在濕熱環(huán)境下容易破壞,不能提高BFRP筋耐腐蝕性能。對(duì)比BFRP筋各腐蝕齡期拉伸和剪切強(qiáng)度保留率：BFRP筋剪切強(qiáng)度保留率大于拉伸強(qiáng)度保留率；BV筋同腐蝕齡期拉伸與剪切強(qiáng)度保留率差異性較小,BE筋拉伸與剪切強(qiáng)度保留率差異較大。
[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，

本文編號(hào)：1933343