Recycled Aggregate Mortar Made with the Recycled Concrete Aggregate and Fly Ash

Abstract

With the aim of sustainable development of the construction industry, a large number of theoretical and practical research is currently being carried out on the possibilities of using various recycled materials in cement composites. The paper presents one possibility of designing the composition of a mortar-type composite made with recycled aggregate and fly ash. In order to improve the properties of the recycled aggregate, sodium silicate was used. The investigated properties included in the fresh state: density and consistency, measured by the flow-table method, and in the hardened state: density, flexural strength and compressive strength. The mixture made with sodium silicate and with recycled aggregate showed the lowest bulk density in the fresh state, and the stiffest consistency. In the hardened state, the mentioned mixture had the highest values of flexural strength and compressive strength, with the lowest value of density.