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  薛偉辰¹，付凱¹，李向民²

  （1 同濟(jì)大學(xué)建筑工程系，上海 200092； 2 上海建科院上海市工程結(jié)構(gòu)新技術(shù)重點(diǎn)實(shí)驗(yàn)室，上海 200032）

 

［摘要］為實(shí)現(xiàn)預(yù)制夾芯保溫墻體主體結(jié)構(gòu)與圍護(hù)結(jié)構(gòu)同壽命，有必要開展混凝土環(huán)境下預(yù)制夾芯保溫墻體纖維增強(qiáng)塑料(FRP)連接件的力學(xué)性能（主要是層間剪切性能）的加速老化試驗(yàn)研究。基于ACI 440.3R-04規(guī)定的試驗(yàn)方法，將30根預(yù)制夾芯保溫墻體FRP連接件浸入60℃的模擬混凝土溶液中進(jìn)行加速老化試驗(yàn)，侵蝕時(shí)間分別為3.65，18，36.5，92，183d，主要分析了侵蝕時(shí)間對(duì)FRP連接件層間剪切強(qiáng)度的影響。研究表明，在60℃模擬混凝土溶液環(huán)境下，F(xiàn)RP連接件的層間剪切強(qiáng)度早期退化較快，侵蝕36.5d后，退化速率逐漸變緩；侵蝕36.5d和183d后，F(xiàn)RP連接件的層間剪切強(qiáng)度分別下降了17.22%和26.89%。掃描電子顯微鏡(SEM)的觀測(cè)表明，侵蝕后FRP連接件劣化區(qū)域內(nèi)的纖維與周圍樹脂之間出現(xiàn)了明顯的脫粘現(xiàn)象，而且隨著侵蝕時(shí)間的增加這種脫粘現(xiàn)象更加明顯。

［關(guān)鍵詞］預(yù)制夾芯保溫墻體；FRP連接件；模擬混凝土環(huán)境；抗剪性能

中圖分類號(hào)：TU377-4文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1002-848X(2012)07-0106-03

 

Xue Weichen¹, Fu Kai¹, Li Xiangmin²

(1 Department of Building Engineering, Tongji University, Shanghai 200092, China;2 Shanghai Key Laboratory of New Technology Research on Engineering Structure, SRIBS, Shanghai 200032, China)

 

Abstract: In order to make the main structure of the precast sandwich insulation wall panel to have the same life with building envelope, it is necessary to conduct the accelerated aging tests for evaluation of mechanical property (mainly its interlaminar shear strength) for FRP connectors under simulated concrete environment. According to the ACI 440.3R.04, the test consisting of 30 FRP connectors in 60℃ of simulated concrete environment for 3.65, 18, 36.5, 92, 183d was conducted to evaluate the interlaminar shear strength of FRP connectors under simulated concrete environment. The results show that, with the aging time, the interlaminar shear strength of FRP connectors decreased significantly before 36.5d.After being exposed to simulated concrete environment for 36.5, 183d, interlaminar shear strength degradation of FRP connectors were 17.22%and 26.89% respectively. The micro-formation of the FRP connectors’ surface was surveyed under scanning electron microscopy (SEM), and it indicates that the bonds between fiber and resin of FRP connectors in the corrosion region become loose, and with the corrosion time increased, the interfacial debonding between fiber and resin of FRP connectors becomes more significant.

Keywords: precast sandwich insulation wall panel; FRP connector; simulated concrete environment; shear behavior

*國(guó)家自然科學(xué)基金項(xiàng)目(50978193)，上海市科學(xué)技術(shù)委員會(huì)科研計(jì)劃項(xiàng)目(10dz1202200，10dz0583700)。

作者簡(jiǎn)介：薛偉辰，教授，博士生導(dǎo)師，Email：xuewc@#edu.cn。

 

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