关键词: 玻璃纤维增强复合材料筋, 工程用水泥基复合材料, 冻融循环, 中心拉拔试验, 本构模型

Abstract: The combination of engineering cementitious composites ( ECC) and glass fiber reinforced composites ( GFＲP) can effectively improve the durability of structures ，but the research of bond durability between GFＲP and ECC was rarely reported under the environment of freezing-melting circulation． 42 specimens divided into 9 groups were designed herein． Quick freezing method was adopted to investigated the changes of the weight loss rate， the transverse relative dynamic modulus of elasticity of ECC，bond strength between GFＲP and ECC compared with the ordinary concrete after 75 freezing-melting circulation，and the bond-slip curves of specimens were also ana- lyzed． The results show that the antifreeze quality of ECC is superior to that of the ordinary concrete，and the bond- ing property between ECC and GFＲP bars of strength grade C30 and C50 are 3. 0 times and 4. 3 times of that ordi- nary C30 concrete and GFＲP bars respectively after 75 times freezing-melting circulation． The pull-out test results were fittingly compared with the analytical models including mBPE model，CMＲ model and continuous curve mod- el，thus the corresponding fitting parameters and fitting correlation coefficients were obtained，and the study shows that the CMＲ model provides better fitting prediction．

Key words: glass fiber reinforced composites bar, engineering cementitious composites, freezing-melting circula-tion, central pull-out test, constitutive model