CAJ | 학술논문

实际工程新老混凝土粘接时，老混凝土龄期可能从初凝至数十年。目前，对短龄期老混凝土与新混凝土粘接劈拉强度研究较少，本文在不同界面剂、不同浇筑结合方式下研究了老混凝土龄期从初凝至28d的新老混凝土的粘结劈拉强度，发现粘结劈拉强度随老混凝土龄期增大而减少，并逐渐趋于稳定；界面剂的使用提高了新老混凝土的粘结劈拉强度，水泥砂浆界面剂的效果略优于水泥净浆界面剂；水平结合的劈拉强度均远大于竖直结合的劈拉强度；在机理分析的基础上拟合出粘结劈拉强度随老混凝土龄期变化的公式。
실제공정신로혼응토점접시，로혼응토령기가능종초응지수십년。목전，대단령기로혼응토여신혼응토점접벽랍강도연구교소，본문재불동계면제、불동요축결합방식하연구료로혼응토령기종초응지28d적신로혼응토적점결벽랍강도，발현점결벽랍강도수로혼응토령기증대이감소，병축점추우은정；계면제적사용제고료신로혼응토적점결벽랍강도，수니사장계면제적효과략우우수니정장계면제；수평결합적벽랍강도균원대우수직결합적벽랍강도；재궤리분석적기출상의합출점결벽랍강도수로혼응토령기변화적공식。
Old-concrete age of new-to-old concrete may be from initial setting to decades in the actual project. At present, studying on bond splitting strength of the new-concrete-to-short-age-old is less, considering different interface cementing agent, different combination method, the new-to-old concrete bond splitting strength rule which old-concrete age from initial setting to 28d is studied in this paper, and it is found that bond splitting strength increases with old-con-crete age decreasing, and then gradually stabilized. The splitting strength of new old concrete bond can be improved though using interface cementing agent, mortar interface cementing agent is slightly better than that of cement paste inter-face cementing agent. The splitting strength of level combination is far greater than vertical combination. Based on mecha-nism analysis, the bond splitting strength with old-concrete age changing formula is fitted.