This study elucidated cement-grouted rocks' tensile strength and failure characteristics through pull-off testing. By subjecting four distinct rock types (siltstone, sandstone, slate, and granite) to examination, encompassing both natural and artificially induced joint surfaces, we scrutinized the interplay of influential factors such as rock strength and surface roughness on the mechanical behavior of cement-grouted rocks. Our findings revealed a direct correlation between the rocks' unconfined compression strength (UCS) and their tensile strength post-grouting, with specimens boasting higher UCS demonstrating enhanced tensile resilience. The cement-grouted siltstone type I exhibiting rock failure primarily attributable to its diminished UCS. Contrastingly, siltstone type II and slate showcased failure propagation predominantly along the interface between the rock and cement material. Conversely, distinguished by their robust UCS, sandstone and granite displayed a dual failure mode involving both interface and cement degradation. Additionally, the surface roughness of the rocks emerged as a critical determinant in failure behavior. Specimens characterized by pronounced surface roughness demonstrated a more pronounced cement failure propensity, resulting in superior tensile strength compared to counterparts with lower roughness profiles.