A Comprehensive Study of Fly Ash Based Geopolymers Activated at Room Temperature

Natali, Maria Elia (2016) A Comprehensive Study of Fly Ash Based Geopolymers Activated at Room Temperature, [Dissertation thesis], Alma Mater Studiorum Università di Bologna. Dottorato di ricerca in Ingegneria civile, ambientale e dei materiali, 28 Ciclo. DOI 10.6092/unibo/amsdottorato/7373.
Documenti full-text disponibili:
Documento PDF (English) - Richiede un lettore di PDF come Xpdf o Adobe Acrobat Reader
Download (67MB) | Anteprima


This research presents the overall results obtained by investigating the performances of fly ash based geopolymers activated at room temperature. Several characterization tests have been perfomed, starting from a deep understanding of the raw materials, in view of finding alternative solutions to the use of traditional hydraulic binders or ceramic materials via alkali-activation. Different types of geopolymer samples (i.e., pastes, mortars and reinforced mortars) have been formulated by varying the nominal Na2O/SiO2 molar ratio in the activating solutions (and in a specific case the curing conditions) and their chemical, physical, mechanical and microstructural performances have been evaluated comparing the results obtained by using different types of precursors and by a traditional cement-based binder. Specific attention has ben focused on durability issues such as high temperature applications and corrosion resistance of the embedded rebars in geopolymer mortars exposed to aggressive environments. Alkali-activation has been found to represent a valid approach in developing performant cement-free products but step forward are needed in order to optimize the solution chemistry and enhance physical and mechanical properties starting from a deep understand at nanoscale of the geopolymerization reaction mechanisms.

Tipologia del documento
Tesi di dottorato
Natali, Maria Elia
Dottorato di ricerca
Scuola di dottorato
Ingegneria civile ed architettura
Settore disciplinare
Settore concorsuale
Parole chiave
fly ash, geopolymers, alkali-activation, mortar, durability, corrosion, carbonation, PDF analysis, characterization, microstructure, porosity, high-temperature
Data di discussione
27 Maggio 2016

Altri metadati

Statistica sui download

Gestione del documento: Visualizza la tesi