基于ACI 440.3R-04规定的试验方法,对60℃碱环境下应力水平分别为0、25％和45％的玻璃纤维塑料(GFRP)筋的抗拉性能进行了试验研究.试件数量共90根,侵蚀时间分别为3.65、18、36.5、92、183天.采用SEM对腐蚀前后GFRP筋的微观形貌进行了观测,发现碱溶液造成了GFRP筋内部结构致密性的降低,且随着应力水平的增加,其降低愈发明显.在60℃碱溶液中侵蚀183天后,应力水平为0和25％的GFRP筋的抗拉强度分别下降了48.81％和55.56％,而弹性模量仅分别下降了5.47％和5.73％,应力水平为45％的GFRP筋则出现了断裂现象.GFRP筋的吸湿试验表明,OH离子在GFRP筋中的扩散过程符合Fick定律.在分析了应力水平、侵蚀时间等参数对GFRP筋抗拉性能影响的基础上,基于Fick定律提出了碱环境下带应力GFRP筋抗拉强度的退化模型.
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