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(1東華理工大學(xué)建筑工程學(xué)院， 南昌 330012； 2武漢理工大學(xué)交通學(xué)院， 武漢 430063)
［摘要］GFRP筋樹脂在濕熱環(huán)境下較易于吸收水分，對GFRP筋的抗拉強度及耐久性能造成不可逆的損傷，然而，目前針對高溫養(yǎng)護混凝土中GFRP筋的吸濕性能研究十分有限。因此，針對不同纖維含量比例、不同養(yǎng)護溫度環(huán)境，研究了高溫養(yǎng)護混凝土中GFRP筋吸濕行為的影響規(guī)律，建立了蒸養(yǎng)混凝土中GFRP筋擴散系數(shù)的預(yù)測模型。試驗結(jié)果表明：GFRP筋復(fù)合材料的吸濕行為基本滿足Fick第二定律；纖維含量與養(yǎng)護溫度對GFRP筋的吸濕行均存在較大的影響；當(dāng)纖維含量增加時，材料的平衡吸濕量、吸濕速率及擴散系數(shù)D均有所降低；當(dāng)養(yǎng)護溫度越高時，平衡吸濕量和擴散系數(shù)D越大，吸濕速率越高。但養(yǎng)護溫度20℃時影響相對較小，當(dāng)養(yǎng)護溫度60℃以上時，吸濕行為影響較為明顯。
［關(guān)鍵詞］GFRP筋； 高溫養(yǎng)護； 纖維含量； 吸濕率； 擴散系數(shù)
中圖分類號：TU375文獻標識碼：A文章編號：1002-848X(2019)22-0097-04
Effect of high temperature curing on moisture absorption performance of GFRP bars embedded in concrete
Yang Wenrui1, Yuan Jiao1, Feng Zhongmin1, Li Huiying1, He Xiongjun2
（1 School of Architectural Engineering, East China University of Technology， Nanchang 330012, China;2 School of Transportation， Wuhan University of Technology， Wuhan 430063, China)
Abstract:The resin of GFRP bars is easy to absorb moisture in hot and humid environment, which causes irreversible damage to the tensile strength and durability of GFRP bars. However, the research on the moisture absorption performance of GFRP bars in high temperature curing concrete is very limited. Therefore, in view of the different fiber content ratios and the different curing temperatures, the influence of moisture absorption performance of GFRP bars in high temperature cured concrete was studied, and the prediction model of diffusion coefficient of GFRP bars in steam-curing concrete was established. The experimental results show that the moisture absorption behavior of GFRP bars basically meets the Fick′s Second Law; the moisture absorption behavior of GFRP bars is greatly affected by the fiber content and the curing temperature; the equilibrium moisture absorption, moisture absorption rate and diffusion coefficient D of the composites decrease with the fiber content increases; when the curing temperature increases, the equilibrium moisture absorption and diffusion coefficient D increase, and the moisture absorption rate increases. However, the effect of the curing temperature is relatively small at 20℃, and the effect on moisture absorption behavior is mainly reflected in the curing temperature above 60℃.
Keywords:GFRP bar; high temperature curing; fiber content ratio; moisture absorption rate; diffusion coefficient
*江西省自然科學(xué)基金(20181BAB216027)，江西省教育廳科技計劃項目(GJJ170486), 博士啟動金 (DHBK2017119), 國家自然科學(xué)基金(51178361)。
作者簡介：楊文瑞，博士，講師，Email:wryang99@163.com。
