This present study seeks to explore the impact of silica fume material (SFM) as a partial replacement for cement on the mechanical characteristics of High-Strength-Highly-Flowable Concrete (HSHFC). The proportion of fine aggregate, coarse aggregate, and fine silica sand utilized as filler was determined using the highest packing density method. Compressive strength, elastic modulus, ultrasonic pulse velocity (UPV), and volume of permeable voids (VPV) tests were conducted for various SFM content variations: 0%, 2.5%, 5.0%, and 7.5% in order to evaluate the influence of SFM. The results indicate that the compressive strength and elastic modulus values increased along with the percentage of SFM. The SFM7.5 variation had optimum results for both compressive strength and elastic modulus at 28 days, with compressive strength of 70.18 MPa and elastic modulus of 32948.60 MPa. The UPV value at 28 days for variations of 0%, 2.5%, 5.0%, and 7.5% had values of 4.46 km/s, 4.41 km/s, 4.38 km/s, and 4.38 km/s, respectively, that indicate all concrete variations are classified as good quality. Overall, the study confirms that SFM can enhance the mechanical characteristics of HSHFC when used as a partial cement replacement.