USING SCORIA AS FINE AGGREGATE IN LIGHTWEIGHT MORTAR AND CONCRETE

In this paper the mechanical properties and workability of lightweight concrete and mortar made with different percentage of scoria instead of sand and different water – cement ratios and cement contents has been studied. In the first part, 0, 20, 30, & 40% scoria instead of sand 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. In the second part, 0, 5, 10, 15, …, 100 % scoria instead of sand were investigated to make lightweight mortar in 0.55 water-cement ratio and 350 Kg/m3 cement content. The results indicate that the mixture with more than 40% scoria instead of sand for concrete and 60% for mortar are 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.

Keywords:

Scoria , Compressive Strength , Tensile Strength , Density , Slump