The Effect of Water Cement Ratio on Cement Brick Containing High Density Polyethylene (HDPE) as Sand ReplacementNoorwirdawati Ali, Nor Fazlin Mohd Yusup, Faisal Sheikh Khalid, Shahiron Shahidan and Siti Radziah AbdullahMATEC Web of Conferences, 150 (2018) 03010DOI: https://doi.org/10.1051/matecconf/201815003010