摘要
为研究海洋环境下玄武岩纤维布对混凝土桥墩耐久性的影响,用混凝土圆柱试件模拟桥墩,对其进行抗压试验。制作未包裹、3条带玄武岩纤维布包裹的和全包裹的3种圆柱体混凝土试件,将试件和玄武岩纤维浸泡在5倍浓度海水中,每隔45d对试件进行抗压试验,并观察玄武岩纤维的表面形态。试验结果表明:相同腐蚀时间下,玄武岩纤维布包裹的试件的抗压强度比未包裹的大,且玄武岩纤维布全包裹的试件的防腐蚀性能优于3条带包裹的试件;在腐蚀初期,玄武岩纤维布包裹的试件的抗压强度降低率较小,随着腐蚀时间的增长,抗压强度降低率显著增大;玄武岩纤维布包裹的试件呈脆性破坏;玄武岩纤维在浸泡约90d出现腐蚀;包裹玄武岩纤维布能有效提高混凝土的耐久性能。
To study the effect of the basalt fiber reinforced polymer （BFRP） sheets on the du rability of concrete pier in marine environment, the specimens of concrete cylinders were used to simulate the pier and the compressive tests for the cylinders were made. 3 types of the specimens of the concrete cylinders that were not wrapped with the BFRP sheet, wrapped with only 3 pieces of the BFRP sheets and fully wrapped with the BFRP sheet were prepared and the specimens and the BFRP sheets were dipped in the sea water of 5 times concentration. The compressive tests for the specimens were made every 45 d and the surface patters of the BFRP sheets were observed. The results of the tests show that in the same corrosion time, the compressive strength of the specimens wrapped with the BFRP sheets is greater than that of the specimen not wrapped with the BFRP sheet and the anticorrosion capacity of the specimen fully wrapped with the BFRP sheet is superior to that of the specimen wrapped with 3 pieces of the BFRP sheets. In the initial time of corrosion, the reduction rates of the compressive strength of the specimens wrapped with BFRP sheets are little, however, with the increase of the corrosion time, the reduction rates of the compressive strength remarkably increase, the specimens wrapped with BFRP sheets present the brittle failure and the BFRP sheets become corroded about 90 d after they have been dipped in the sea water. By wrapping with the BFRP sheets, the durability performance of the concrete canbe effectively improved.
出处
《桥梁建设》
EI
CSCD
北大核心
2014年第1期75-80,共6页
Bridge Construction
关键词
桥墩
海洋环境
混凝土
玄武岩纤维布
加固
抗压强度
耐久性
pier
marine environment
concrete
basalt fiber reinforced polymer sheet
strengthening
compressive strength
durability
