This dataset contains experimental measurements from 27 wedge-splitting fracture tests performed on water-saturated petroleum cement. The dataset includes: 7 fully instrumented experiments (WST) with mechanical measurements and pore pressure recordings. 17 pore-pressure-only experiments (MA) with pore pressure recordings. 3 partially dried reference experiments (Dry) with mechanical measurements. All data correspond to the experiments analyzed in the associated publication. Files are named EXPERIMENT_NAME + extension, where the extension indicates the data type: _meca.csv – Raw mechanical measurementsColumns: time (s), force (N), opening (m) _mecaAnalyzed.csv – Mechanical quantities derived using a compliance methodColumns: time (s), ell (m), ellVelocity (m/s), G (J/m²), Delta_ell (m), Delta_ellVelocity (m/s), Delta_G (J/m²) _pp.csv – Internal pore pressure measurementsColumns: time (s), kyowa (kPa) All quantities use SI units, except pore pressure (kyowa) reported in kPa.