CAJ | 학술논문

海水寒冷地区的钢筋混凝土结构受到冻融循环与氯离子侵蚀的耦合作用，且混凝土结构通常是带裂缝工作。侵蚀与冻融循环容易造成钢筋与带有初始裂缝的混凝土之间的黏结性能退化。通过试验室模拟环境，对36个钢筋混凝土拔出试件经历300次冻融循环交替100次海水浸泡后，研究不同宽度初始横向裂缝和不同钢筋直径对钢筋与混凝土之间黏结性能的影响。结果表明，钢筋与混凝土的黏结强度随着初始裂缝宽度的增大而降低，且随着钢筋直径的增大而降低；随着钢筋直径加大，初始裂缝宽度对试件黏结强度的影响削弱。与无初始裂缝试件的黏结强度相比，初始裂缝宽度为0.19 mm时，钢筋直径为10、14、18 mm试件的黏结强度分别降低34.1%、26.7%、20.7%。
해수한랭지구적강근혼응토결구수도동융순배여록리자침식적우합작용，차혼응토결구통상시대렬봉공작。침식여동융순배용역조성강근여대유초시렬봉적혼응토지간적점결성능퇴화。통과시험실모의배경，대36개강근혼응토발출시건경력300차동융순배교체100차해수침포후，연구불동관도초시횡향렬봉화불동강근직경대강근여혼응토지간점결성능적영향。결과표명，강근여혼응토적점결강도수착초시렬봉관도적증대이강저，차수착강근직경적증대이강저；수착강근직경가대，초시렬봉관도대시건점결강도적영향삭약。여무초시렬봉시건적점결강도상비，초시렬봉관도위0.19 mm시，강근직경위10、14、18 mm시건적점결강도분별강저34.1%、26.7%、20.7%。
Reinforced concrete structures in cold coastal regions are exposed to coupling effects of freeze-thaw cycles and chloride cor-rosion.Meanwhile,concrete structures cracks normally under service loads.Bond strength between reinforcement bars and concrete with initial cracks would deteriorate under coupled actions of freeze-thaw cycles and chloride corrosion.The cold marine environment was simu-lated in laboratory.To investigate the effects of crack width and bar diameter on the bond strength between steel bars and concrete,36 pull-out specimens were tested after 300 cycles of freeze-thaw alternatively 100 times of seawater immersion.The results showed that the bond strength between steel bar and concrete decreased as the width of the initial crack or the diameter of the steel bar increased.With in-creasing the diameter of the steel bars,the effect of the initial cracks on the bond strength was weakened.Compared with specimens without initial cracks,when the width of initial crack was 0.19mm,the bond strength of the specimens with bar diameter of 10mm,14mm and 18mm decreased by 34.1%,26.7% and 20.7%,respectively.