Research on the Application of Fine Iron Tailings in Surface Mortar for External Thermal Insulation on Outer-walls

Abstract

Three gradations of fine iron tailings are selected to prepared surface mortar for external thermal insulation on outer-walls for replacing natural sand. The working performance and mechanical performance of the surface mortar for external thermal insulation on outer-walls are studied. The results show that the water requirements of surface mortar for external thermal insulation on outer-walls is almost no difference at same consistency when the dosage of 0-0.1mm, 0.1-0.3mm and 0.3-0.5mm fine iron tailings is respectively below 80g/kg, 100g/kg, 150g/kg, and the flexural strength, compressive strength and tensile adhesive strength at 28d of surface mortar for external thermal insulation on outer-walls is higher than it prepared natural sand. The water requirements of surface mortar for external thermal insulation on outer-walls prepared by fine iron tailings instead of all natural sand is 24% higher than it by prepared natural sand, the flexural strength, compressive strength and tensile adhesive strength at 28d of surface mortar for external thermal insulation on outer-walls is slightly lower than it prepared by natural sand. The working performance and mechanical performance of the surface mortar for external thermal insulation on outer-walls by fine iron tailings instead of all natural sand can meet requirements of JC/T 2084-2011. The natural sand less than 0.5mm is selected to prepare surface mortar for external thermal insulation on outer-walls. Its dosage is more than 60%. The fine iron tailings meet particle size requirement of surface mortar for external thermal insulation on outer-walls. So the surface mortar for external thermal insulation on outer-walls is prepared by fine iron tailings instead of natural sand. That not only can solve the environmental problems and safety problems caused by fine iron tailings, but also ease the shortage of natural sand resources. Different particle sizes and different dosages of fine iron tailings are chosen to substitute the natural sand. The working performance and mechanical properties of the surface mortar for external thermal insulation on outer-walls are studied.