New construction material from concrete production and demolition waste and lime production waste

Resumo

It was developed and patented new construction materials from concrete production and demolition waste and lime production waste. The main objective of the research was to utilize these two types of industrial wastes in large possible scale as new concrete’s raw materials. The lime production waste was characterized by a high excess of SiO2, Al2O3, CaCO3, etc. The water absorption value of the mixtures samples after 90 days of open air strengthening reach till 12,0%, the uni-axial compression resistance – till 33 (average 29) MPa. The results of DRX and MEV studies of the compositions allow the explaining of such growing up of the resistance by the complex of reasons. Among them are the transformation of the initial mixture’s minerals (Lime and Portlandite) to calcium, magnesium and ferrous amorphous and crystalline carbonates (Calcite, Dolomite e Ancerite); by chemical interaction of concrete waste with lime component and growing up of new amorphous and crystalline Calcium Hydro-Silicate forms; Tobermorite, Afwillite and CSH. Economic efficiency calculation was beside of the research tasks, but it must be rather high because of zero prices of raw materials. But the main expecting advantage of the material utilization is the environment protection by the way of wastes utilization.