Utilization of demolished concrete, grog, hydrated lime and cement kiln dust in building materials

摘要

It is desirable to completely recycle concrete waste in order to protect natural resources and reduce environment pollution. In this paper, the studied reference mix composed of demolished waste concrete/grog/hydrated lime in the ratio of (40/50/10, wt. %), while other mixes has cement kiln dust as a partial replacement of hydrated lime in the ratio from zero up to complete replacement. Both grog and burned cement kiln dust were obtained from firing clay materials as well as by-pass cement kiln dust at 850°C for 1 h with a heating rate of 5°C/min. Results of this study possess a method for recycling of demolished wastes in brick making as fine materials not in the traditional method that used it as aggregate. Waste concrete, grog, hydrated lime and by-pass cement dust can be used instead of the cement constituent of mortar and hydrated building brick making.