We present a 1-bit reconfigurable intelligent surface (RIS) operating at millimeter-wave frequencies that employs a random pre-phasing technique to suppress the undesired quantization/grating lobes that are encountered in binary phase modulation schemes and has scalable architecture to realize large apertures. The random phases are realized using delay lines integrated within each unit cell of the surface, thus breaking the periodicity of the quantization error. The proposed RIS consists of four metasurface tiles each consisting of 64 radiating elements (16 × 16). A 4-layer implementation is adopted with the radiating elements, delay lines, switches at the top surface, the power planes in the middle layers, and biasing circuitry on the bottom layer. A separate control board is implemented to house the control unit, connectors to mate metasurface tiles and power supply. The prototype is designed to operate at 27.2 GHz and perform electronic beam steering in ±60° in both azimuth and elevations planes. The prototype is fabricated using printed circuit board (PCB) technology and characterized using a mmWave radar cross-section measurement setup. A quantization lobe reduction of more than 10 dB is achieved with the proposed technique, and the surface is well suited for mmWave 5G communication scenarios to enhance signal coverage and signal-to-noise ratio.