Experimental study on compressive strength of Interlocking Hollow Block System (IHBS) using fly ashMuizzatun Nasirah Kepli, Poi Ngian Shek, Mahmood Md Tahir, Abdul Rahman Mohd.Sam, Nor Hasanah Abdul Shukor Lim and Eeydzah AminudinE3S Web Conf., 347 (2022) 02008DOI: https://doi.org/10.1051/e3sconf/202234702008