Use of construction and demolition wastes as raw materials in cement clinker production--颗粒学报PARTICUOLOGY

Galbenis, C.-T., & Tsimas, S. (2006). Use of construction and demolition wastes as raw materials in cement clinker production. China Particuology, 4(2), 83–85. https://doi.org/10.1016/S1672-2515(07)60241-3

Use of construction and demolition wastes as raw materials in cement clinker production

Christos-Triantafyllos Galbenis ^a *, Stamatis Tsimas ^a

a Laboratory of Inorganic and Analytical Chemistry, School of Chemical Engineering, National Technical University of Athens, 9 Heroon Polytechniou, Zografou Campus, 15773, Athens, Greece

10.1016/S1672-2515(07)60241-3

Volume 4, Issue 2, April 2006, Pages 83-85

Received 17 December 2005, Accepted 10 March 2006, Available online 27 November 2007.

E-mail: ctgalben@central.ntua.gr

Highlights

Abstract

The aim of the present paper was to investigate the possibility of utilizing Construction and Demolition (C&D) wastes as substitutes of Portland cement raw meal. The C&D wastes that were so used, were the Recycled Concrete Aggregates (RCA) and the Recycled Masonry Aggregates (RMA) derived from demolished buildings in Attica region, Greece. RCA and RMA samples were selected because of their calcareous and siliceous origin respectively, which conformed the composition of the ordinary Portland cement raw meal. For that reason, six samples of cement raw meals were prepared: one with ordinary raw materials, as a reference sample, and five by mixing the reference sample with RCA and RMA in appropriate proportions. The effect on the reactivity of the generated mixtures, was evaluated on the basis of the free lime content (fCaO) in the mixtures sintered at 1350°C, 1400°C and 1450°C. Test showed that the added recycled aggregates improved the burnability of the cement raw meal without affecting negatively the cement clinker properties. Moreover, the formation of the major components (C₃S, C₂S, C₃A and C₄AF) of the produced clinkers (sintered at 1450°C) was corroborated by X-Ray Diffraction (XRD).

Graphical abstract

Keywords

recycled concrete aggregates; recycled masonry aggregates; cement raw meal; burnability study

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