THE DURABILITY OF GLASS FIBER REINFORCED COMPOSITE REBARS IN SALT LAKE HIGH AND COLD AREA1)
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摘要: 对玻璃纤维(glass fiber reinforced polymer, GFRP)筋和GFRP -钢筋夹芯复合筋在盐湖地区多重环境因素耦合作用下进行耐久性试验,分析环境类型及作用时间对极限抗拉强度、弹性模量、极限应变的影响。结果表明：在多重因素耦合作用下,随着盐湖卤水腐蚀周期、冻融次数、干湿循环次数的增加,GFRP筋和GFRP夹芯复合筋的抗拉强度逐渐减小,但是GFRP筋减小的幅度较小,而GFRP夹芯复合筋由于有钢筋的存在,抗拉强度减小比较大,特别是在盐湖卤水90 d以上、冻融150次以上时GFRP夹芯复合筋的极限抗拉强度实验不是很明显,屈服强度几乎不存在并且与抗拉极限强度相接近,表现出明显的脆性;在各种因素作用下,GFRP筋随着龄期的增加,弹性模量先减少后增加,而GFRP夹芯复合筋的弹性模量逐渐减小,相对来讲减小的幅度不是很大;各种耦合因素作用下GFRP筋和GFRP夹芯复合筋的极限抗拉强度、弹性模量均比单因素作用下小,且腐蚀性的大小关系是盐湖卤水+干湿循环+冻融耦合>盐湖卤水+干湿循环>冻融>盐湖卤水。Abstract: The durability tests of glass fiber (GFRP) and GFRP-reinforced steel rebars are carried out under the action of multiple environmental factors in Salt Lake Area. The environmental types and the action time influence the ultimate tensile strength, the elastic modulus and the ultimate strain. It is shown that the tensile strength of the GFRP rebars and the GFRP steel rebars decreases gradually with the increase of the corrosion cycles, the freeze-thaw cycles and the dry-wet cycles in Salt Lake, and the brine under the coupling of multiple factors, but the tensile strength reduction of the GFRP rebars is small, the ultimate tensile strength reduction of GFRP steel rebars is not significant, especially when the GFRP steel rebars is put in Salt Lake for more than 90 days. With the brine and more than 150 cycles of freeze-thaw, the yield strength of the GFRP bars is almost non-existent and close to the ultimate tensile strength, and the elastic modulus of the GFRP bars decreases and then increases with the increase of age, however, the elastic modulus of the GFRP rebars decreases gradually, which is not very large in comparison with the GFRP rebars under various coupling factors, and the ultimate tensile strength and the elastic modulus of the GFRP rebars under various coupling factors are smaller than those under a single factor, and the relationship with the corrosivity is: Salt Lake Brine + dry-wet cycle + freeze-thaw coupling > Salt Lake Brine + dry-wet cycle > freeze-thaw > Salt Lake Brine.
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