Use of recycled waste in the production of building materials

Abstract

With the development of modern society, technological progress does not stand still. Mankind is constantly in search of new ideas and ways of implementation. This article of the authors is part of the modernization of the existing system of production of building materials. The authors propose to use secondary raw materials for the manufacture of a standard product, confirm them with laboratory tests and results. The indicators of the modified concrete mixture with the addition of ash-and-slag waste from the local industrial sector gave a density not inferior to the heavy concrete of 1.8 g/cm3. Positive effect is obtained by using hydraulic press, where at equal ratio of components due to pressing, all samples were transferred to a number of heavy concretes with a density of 1.8 to 2.5 g/cm3. Moreover, it was found that there are reserves of cement saving in the application of ash in the case of samples prepared by means of hydraulic press, as well as to correct the composition of concrete it is required to carry out a full-scale experiment with the joint action of vibration and pressing. Strength tests of samples show that there is an optimum quantity of ash and slag in the formulation, at that not only the standard requirements for the quality of construction products are met, but also exceeds some characteristics of products according to the requirements of standards.

Electric steelmaking dust as a raw material for coagulant production

“…Efforts were made around the world to stabilize EAF dust. There are studies on the use of dust with a high FeO content for asphalt modification, in cement mortars, to produce sintered bodies with promising mechanical properties [22][23][24]. Studies evaluating the use of EAF dust in ceramic and cement compositions show that although the dust properties may vary depending on the physical and chemical properties of the raw materials and process parameters, it is possible to develop process circuits and modify the waste (i.e., by hydrometallurgy, pyrometallurgy, etc.)…”