Crumb rubbers exhibit extensive potential applications as infrastructure materials due to the low elastic modulus. Nevertheless, the poor interfacial adhesion between rubber crumb and cement matrix limits the scale applications of crumb rubbers in cement-based composites. In this study, mussel-inspired modification of crumb rubbers is investigated. The hydrophilicity of rubber surface has apparently improved after polydopamine (PDA) modification. Effects of the surface modifications of rubbers on the compressive strength, fluidity, and tribology behaviors of rubberized mortars have been systematically characterized. The superiority of PDA modification for crumb rubbers has been demonstrated by comparing those with the other polyphenol modifications and the routine oxidation modification. The compressive strength of the PDA modified rubber cement mortar increases by 37% comparing with that of the ordinary rubber cement mortar. The mechanical and low-temperature tribology behaviors of PDA-rubberized mortars indicate a promising way to improve the service performance of the rubberized mortars and concretes.

由于低弹性模量，碎橡胶作为基础设施材料表现出广泛的潜在应用。然而，橡胶碎屑与水泥基体之间较差的界面粘附性限制了碎屑橡胶在水泥基复合材料中的规模应用。在这项研究中，研究了受贻贝启发的橡胶屑改性。经聚多巴胺（PDA）改性后，橡胶表面的亲水性得到明显改善。已经系统地表征了橡胶表面改性对橡胶砂浆的抗压强度、流动性和摩擦学行为的影响。通过与其他多酚改性和常规氧化改性的比较，证明了 PDA 改性对粒状橡胶的优越性。PDA改性橡胶水泥砂浆的抗压强度比普通橡胶水泥砂浆提高了37%。PDA 橡胶砂浆的机械和低温摩擦学行为表明了一种提高橡胶砂浆和混凝土使用性能的有前途的方法。