CAJ | 학술논문

通过双面剪切试验，研究了冻融环境下CFRP‐高性能混凝土界面粘结性能的发展规律。对比分析了未经冻融和经历25、50、100、150、200及300次冻融循环作用试件的破坏特征、剪应变分布、荷载滑移曲线、粘结承载力以及粘结破坏机理。结果表明，所有试件的界面破坏均发生在混凝土表层内，但随着冻融循环次数的增加，破坏界面有向胶层发展的趋势；经受冻融循环次数较少时（25、50次），界面的粘结强度、刚度及开裂荷载的变化不明显，甚至略微提高；但随着冻融循环次数的进一步增加，界面粘结性能有明显的变化，界面粘结强度、端部滑移量减小，刚度退化，初始开裂荷载水平降低，非线性特征增强。粘结极限承载力与混凝土立方体抗压强度均随冻融循环次数的增长存在先提高后下降的趋势，混凝土强度变化是界面粘结性能变化的最重要因素。
통과쌍면전절시험，연구료동융배경하CFRP‐고성능혼응토계면점결성능적발전규률。대비분석료미경동융화경력25、50、100、150、200급300차동융순배작용시건적파배특정、전응변분포、하재활이곡선、점결승재력이급점결파배궤리。결과표명，소유시건적계면파배균발생재혼응토표층내，단수착동융순배차수적증가，파배계면유향효층발전적추세；경수동융순배차수교소시（25、50차），계면적점결강도、강도급개렬하재적변화불명현，심지략미제고；단수착동융순배차수적진일보증가，계면점결성능유명현적변화，계면점결강도、단부활이량감소，강도퇴화，초시개렬하재수평강저，비선성특정증강。점결겁한승재력여혼응토립방체항압강도균수동융순배차수적증장존재선제고후하강적추세，혼응토강도변화시계면점결성능변화적최중요인소。
By adopting double shear test ,the developing law of interface bonding properties between CFRP and high performance concrete exposed to freeze‐thaw environment was studied . The damage characteristics ,shear strain distribution ,the paths of the load‐slip curves ,adhesive capacity and failure mechanisms of specimens without freeze‐thaw damage and with 25 ,50 ,100 ,150 ,200 and 300 times freeze‐thaw cycle effect were compared and analyzed .The results showed that interface damage occurred within the concrete surface layer for all of the specimens ,but with the increase of freeze‐thaw cycles ,destroyed interface had the tendency to the adhesive resins layer .Subjected to less freeze‐thaw cycles such as 25 times and 50 times ,the interface bond strength ,rigidity and cracking load didnot change obviously ,even slightly elevated but with the further increase of freeze‐thaw cycles ,interface bond properties changed obviously . Interfacial bond strength and slippage in the end of CFRP decreasedThe rigidity degeneration and nonlinear characteristics were obvious andthe initial cracking load was lowered .The ultimate bearing capacity and the concrete cube compressive strength both declined after increasing with the grow th of the number of freeze‐thaw cycles .The change of concrete strength was an important factor for the changes of interfacial bond properties .