Currently, joint sealant is designed without consideration of the bond strength between the concrete and the sealant and the effect of shape on stress concentration. This often leads to adhesive failures within 1.5 years, earlier than the expected service life of the joint sealant, which is 20 years. In adhesive failure, the strength of the bond and the stress of the interface between the sealant and the face of the joint reservoir play a very important role. To examine the nature of the bond along the sealant/joint well interface, experimental bond tests were conducted. In addition, the stress distribution on the interface was also investigated according to geometry (Shape Factor [SF] and degree of curvature [DoC]). Re-evaluation of the SF was conducted, and a new design factor, DoC, was introduced and investigated through the finite element method of analysis. With these factors, the reduction of bond strength and increase in the stress at the interface can be limited reducing the potential for early adhesive failure. Based on this study, the effect of joint preparation (dirt and moisture) on joint strength and shape (SF and DoC) of joint sealant should be considered when designing and installing sealants.

目前，在设计密封胶时并未考虑混凝土与密封胶之间的粘结强度以及形状对应力集中的影响。这通常会在1.5年内导致粘合失效，比联合密封胶的预期使用寿命（即20年）要早。在胶粘剂失效中，粘接剂的强度以及密封剂和关节腔表面之间的界面应力起着非常重要的作用。为了检查沿密封剂/接头井界面的粘结性质，进行了实验粘结试验。此外，还根据几何形状（形状因数[SF]和曲率[DoC]）研究了界面上的应力分布。对SF进行了重新评估，并设计了一个新的设计因子DoC，通过有限元分析法进行介绍和研究。由于这些因素，可以限制粘结强度的降低和界面处应力的增加，从而减少早期粘合失败的可能性。基于此研究，在设计和安装密封胶时，应考虑接缝准备（污垢和水分）对接缝胶的接缝强度和形状（SF和DoC）的影响。