Porous Concrete Based on Granite and Limestone Waste: An Innovative Solution for Drainage Channel BaseOktavia Kurnianingsih, Delista Putri Deni, Anandya Rahmad Saddam Hasyim, Bachtiar Bagus Ary Wibisana and Namira Aulia SyahputriE3S Web Conf., 576 (2024) 06001DOI: https://doi.org/10.1051/e3sconf/202457606001