长期腐蚀环境影响下GFRP筋混凝土构件的老化机理及抗弯性能研究

STUDY ON THE AGING MECHANISM AND FLEXURAL BEHAVIOR OF GFRP REINFORCED CONCRETE MEMBERS UNDER LONG-TERM CORROSION ENVIRONMENT

为了研究长期腐蚀环境影响下GFRP筋混凝土构件的老化机理以及抗弯性能,分别分析了水分、温度、碱性环境等因素对GFRP筋抗拉强度、有效受拉面积和粘结强度等性能方面的影响。基于GFRP筋材料老化后与混凝土协同工作关系的变化,通过构造新的几何条件,推导了老化GFRP筋正截面抗弯承载力计算公式,利用推导的公式分析了不同GFRP筋老化率对构件承载力的影响。研究表明:GFRP筋混凝土构件在腐蚀环境长期作用下,GFRP筋不断老化,其抗拉强度、有效受拉面积以及粘结性能都有不同程度的降低;随着GFRP筋材料老化率的不断增加,构件抗弯承载力损失率也不断增加,当老化率达到27%时,构件抗弯承载力也相应损失了25.97%。

Using in-mold coatings is an effective way to improve the coating efficiency of wind turbine blades. There are some special requirements for the processing performance of the in-mould coating system compared with the outer-mould coating system for wind turbine blades. This paper studies the processing applicability of three kinds of in-mold polyurethane gel-coatings used in wind turbine blades. Through research on manipulability, in-mold time, pull-off strength between gel-coating and glass fiber reinforced epoxy composite, release properties in actual wind blade mold, and the observability of the defects in glass fiber reinforced composite covered by coating, it draws a conclusion that two kinds of in-mold polyurethane gel-coating are fit for the production process of wind turbine blades.