Svojstva alkalnoaktivniranih mortova s pepelom drvne biomase i pepelom dobivenim termičkom obradom mulja iz uređaja za pročišćavanje otpadnih voda

master's thesis

• Title (english): Properties of alkali -a acitvated mortars with wood biomass ash and sewage sludge ash
• Author: Tea Dučić
• Mentor: Nina Štirmer (mentor)
• Committee member: Ivana Banjad Pečur (predsjednik povjerenstva)
• Committee member: Bojan Milovanović (član povjerenstva)
• Committee member: Nina Štirmer (član povjerenstva)
• Granter: University of Zagreb; Faculty of Civil Engineering; (Materials); Zagreb
• Defense date and country: 2023-09-28, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Civil Engineering

Abstract

Portlandski cement jedan je od najkorištenijih materijala u građevinskoj industriji, no njegova proizvodnja emitira velike količine ugljičnog dioksida u atmosferu. Iz tog razloga znanstvena zajednica već dugi niz godina istražuje primjenu različitih materijala kao alternativa cementu. Kao jedno od rješenja nameću se alkalnoaktivirani materijali. Alkalnoaktivirani materijali predstavljaju novu generaciju bezcementnih veziva koji se baziraju na reakciji izvora alkalnog metala (aktivatora) s čvrstim silikatnim prahom (prekursorom). Zgura i leteći pepeo smatraju se „standardnim“ prekursorima, ali zbog trenda zatvaranja termoelektrana na ugljen, samnjuju se zalihe tih prekursora i potrebno je naći alternativne materijale. U posljednje se vrijeme sve više pažnje posvećuje ekološki prihvatljivijim otpadnim materijalima kao što su pepeo drvne biomase (PDB) i pepeo dobiven termičkom obradom mulja iz uređaja za pročišćavanje otpadnih voda (engl. sewage sludge ash, SSA). Cilj ovog rada jest utvrditi utjecaj djelomične zamjene (10 %, 30 % i 50 %) prekursora (mljevene granulirane zgure visokih peći) PDB-om i SSA-om uz korištenje odabranih aktivatora, na svojstva alkalnoaktiviranih mortova u svježem i očvrsnulom stanju. U tu svrhu napravljeno je 13 različitih mješavina mortova. Ispitana su svojstva u svježem stanju: vrijeme vezivanja, konzistencija, udio pora, gustoća, temperatura te mehanička svojstva: tlačna čvrstoća i čvrstoća na savijanje. Dobiveni rezultati su analizirani i uspoređeni s rezultatima dobivenim na referentnoj mješavini.

Abstract (english)

Portland cement is one of the most commonly used material in the construction industry, but its production releases large amounts of carbon dioxide into the atmosphere. For this reason, the scientific community has been looking at the use of different materials as an alternative to cement for many years. Alkali-activated materials are imposed as one of the solutions. Alkali-activated materials represent a new generation of cement-free binders based on the reaction of an alkaline metal source (activator) with solid silicate powder (precursor). Slag and fly ash are considered "standard" precursors, but due to the trend of closing coal-fired thermal power plants, the supply of these precursors is decreasing and it is necessary to find an alternative. Recently, more and more attention is being paid to more environmentally friendly waste materials such as wood biomass ash (WBA) and sewage sludge ash (SSA). The aim of this work is to determine the influence of partial replacement (10 %, 30 % and 50 %) of the precursor (ground granulated blast-furnace slag) with WBA and SSA with the use of selected activators on the properties of alkali-activated mortars in fresh and hardened state. For this purpose, 13 different mortar mixtures were made. Fresh properties were tested: setting time, consistency, pore content, density and temperature, as well as the mechanical properties: compressive and flexural strength. The results obtained were analysed and compared with the results of the reference mixture.

• Keywords: alkalnoaktivirani materijali; zgura; pepeo drvne biomase; pepeo dobiven termičkom obradom mulja iz uređaja za pročišćavanje otpadnih voda
• Keywords (english): alkali-activated materials; slag; wood biomass ash; sewage sludge ash
• Language: croatian
• URN:NBN: urn:nbn:hr:237:598656
• Study programme: Title: Civil Engineering; specializations in: Construction Management, Transportation Engineering, Geotechnical Engineering, Hydraulic Engineering, Structural Engineering, Construction Materials, Theory and Modeling of Structures; Course: Construction Management; Study programme type: university; Study level: graduate; Academic / professional title: magistar/magistra inženjer/inženjerka građevinarstva (magistar/magistra inženjer/inženjerka građevinarstva)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Closed access
• Created on: 2023-11-06 07:22:19