title: Volcanic ash-based geopolymer cements/concretes: the current state of the art and perspectives.
abstract: The progress achieved with the use of volcanic ash for geopolymer synthesis has been critically reviewed in this paper. This consists of an overview of mineralogy and chemistry of volcanic ash. The role of chemical composition and mineral contents of volcanic ash on their reactivity during geopolymerization reaction and, consequently, mechanical properties have been accessed. An attempt has been made to establish a relationship between synthesis factors and final properties. A critical assessment of some synthesis conditions has been addressed and some practical recommendations given along with suggestions of future works that have to be done. All this has shown that there are still many works such as durability tests (carbonation, freeze-thaw, resistance, etc.), life cycle analysis, etc. that need to be done in order to satisfy both suitability and sustainability criteria for a large-scale or industrial application.
authors.affiliation: Department of Inorganic Chemistry, Faculty of Science, University of Yaoundé I, P.O. Box 812, Yaoundé, Cameroon. noeldjobo@gmail.com.|CSIR-National Metallurgical Laboratory, Jamshedpur, 831007, India. noeldjobo@gmail.com.
authors.forename: Jean Noël Yankwa
authors.initials: JN
authors.lastname: Djobo
authors.affiliation: Department of Inorganic Chemistry, Faculty of Science, University of Yaoundé I, P.O. Box 812, Yaoundé, Cameroon.
authors.forename: Antoine
authors.initials: A
authors.lastname: Elimbi
authors.affiliation: Department of Inorganic Chemistry, Faculty of Science, University of Yaoundé I, P.O. Box 812, Yaoundé, Cameroon.
authors.forename: Hervé Kouamo
authors.initials: HK
authors.lastname: Tchakouté
authors.affiliation: CSIR-National Metallurgical Laboratory, Jamshedpur, 831007, India.
authors.forename: Sanjay
authors.initials: S
authors.lastname: Kumar
mesh_terms: D060729:Coal Ash / Q000032:analysis*; D019015:Geologic Sediments / Q000737:chemistry; D018707:Volcanic Eruptions
chemical_list: D060729:Coal Ash
keywords: Durability; Geopolymerization; Mechanical properties; Microstructure; Synthesis conditions; Volcanic ash