Table 2. Physical properties of Portland cement Test result Specific surface area (Blain) cm2/g 290 Initial setting (Vicat Method) min. 92 Final setting (Vicat Method) hr. 3:30 Compressive strength (MPa) 3-days 16.5 7-days 25.7 Sarmed Fadhil et al. The Production of Economical Precast Concrete Panels Reinforced by Waste Plastic Fibers. American Journal of Civil Engineering and Architecture, 2015, Vol. 3, No. 3, 80-85. doi:10.12691/ajcea-3-3-4 © The Author(s) 2015. Published by Science and Education Publishing.