making lightweight concrete and mortar by using scoria instead of sand

making lightweight concrete and mortar by using scoria instead of sand

in this paper, the mechanical properties and workability of lightweight concrete and mortar made with a different percentage of scoria instead of sand (sis) and different water-cement ratios and cement contents have been studied. in the first part, 0, 20, 30, & 40% sis has applied to make lightweight concrete with 0.5, 0.55, & 0.60 water-cement ratio and 300, 350, 400 kg/m3 cement content. the mechanical properties of the samples were measured and the best results were selected to make lightweight mortar using 0, 5, 10, 15, …, 100 % sis in 0.55 water-cement ratio and 350 kg/m3 cement content. the results indicate that the mixture with more than 40% sis for concrete and 60% for mortar is defined as the lightweight mixture. also due to larger water absorption of scoria, the mixture made with different percentages of scoria need larger water-cement ratio for suitable workability.