Development of hydraulic binder using industrial wastes

Abstract

This paper is focused on the utilization of landfilled F class fly ash as a main component of hydraulic binder; furthermore quick lime (CaO) and lime kiln dust (LKD) were tested as additives during the experiments. After determination of the material properties, such as particle size distribution, moisture content, real and bulk density and specific surface area, mechanical activation was performed for certain time by laboratory ball mill to improve the pozzolanic activity of fly ash. Than test specimens were produced using different type and composition of hydraulic binder and the compressive strength was measured at 14, 28 and 56 days. Optimal mechanical property was achieved with binder No. II. (containing 80% fly ash, 20% CaO) and No. V. (70% fly ash, 15% CaO and 15% LKD), compressive strength was 4.67 and 4.31 N/mm 2 respectively.

Mineralogical and mechanical transformations in the bulk of a red mud tailing dam

“…A gátanyag nagyrészt ipari hulladéknak minősülő salakból, hamuból és pernyéből épült, amelyre időszakosan cementtejet (esetleg oltott meszet tartalmazó folyadékot) locsoltak, hogy gyorsabban kössön [1]. Ezért a csiszolatokban igen változatos összetételű anyagot találtunk, de alapvetően a következő ás-ványi fázisokat tartalmazták: üveg, salak, műanyag-olvadék, vasoxidok és opak törmelék.…”