Preprint Article Version 1 This version not peer reviewed

Coal Tailings as a Pozzolanic Material in Cements: A Preliminary Study for Their Use in Sleepers and Slab Track Railway System. Part I. Materials Selection

Version 1 : Received: 25 November 2017 / Approved: 27 November 2017 / Online: 27 November 2017 (07:31:37 CET)

How to cite: Yagüe, S.; Sánchez, I.; Vigil De La Villa, R.; García-Giménez, R.; Zapardiel, A.; Frías Rojas, M. Coal Tailings as a Pozzolanic Material in Cements: A Preliminary Study for Their Use in Sleepers and Slab Track Railway System. Part I. Materials Selection. Preprints 2017, 2017110171 (doi: 10.20944/preprints201711.0171.v1). Yagüe, S.; Sánchez, I.; Vigil De La Villa, R.; García-Giménez, R.; Zapardiel, A.; Frías Rojas, M. Coal Tailings as a Pozzolanic Material in Cements: A Preliminary Study for Their Use in Sleepers and Slab Track Railway System. Part I. Materials Selection. Preprints 2017, 2017110171 (doi: 10.20944/preprints201711.0171.v1).

Abstract

One source of kaolinite-rich wastes is from mine tailings and the generation of enormous volumes of mine tailings waste is standard practice in this industry. These volumes of waste are, at present, dumped, provoking significant environmental impact and transforming the environment. The impact of storing coal waste requires the study of eco-innovative solutions for the assessment of waste types. The present investigation has the objective of expanding the knowledge on the behavior of new siliceous-aluminum minerals with pozzolanic activity, of added value in the manufacture of similar cements. Four samples were characterized to determine their chemical, morphological and mineralogical composition. The samples were subjected to different thermal activation conditions for the transformation of an inert waste into a material with cementitious properties. XRD analysis have confirmed the total transformation of kaolinite into metakaolinite. The results have shown that after the activation process, the coal refuse presented good pozzolanic activity, meaning that it may be used as a pozzolanic addition in industrial cements, thereby removing high levels of contaminated waste from the environment. In subsequent investigations, research work will continue with the replication of cements with this pozzolanic addition for use in the manufacture of sleepers and slab track railway system.

Subject Areas

coal tailing; cement; pozzolan; sleepers; slab track; railway

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