Svojstva magnezij-fosfatnog cementa s dodatkom letećeg pepela i metakaolina

master's thesis

• Title (english): Influence of Fly Ash and Metakaolin Addition on Properties of Magnesium Phosphate Cement
• Author: Marin Šepuka
• Mentor: Ana Baričević (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; Zagreb
• Defense date and country: 2023-09-28, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Civil Engineering

Abstract

Magnezij fosfatni cementi (eng. magnesium-phosphate cement, MPC) nastaju pri sobnoj temperaturi reakcijom magnezijevog oksida (MgO) i izvora fosfata. Reakcija se odvija brzo, a za kontrolu vremena vezivanja koriste se usporivači poput borne kiseline. Uobičajeno, magnezijev oksid proizveden na visokim temperaturama kalciniranja (1500 – 2000 °C) koristi se za proizvodnju MPC-a. Međutim, ekološki prihvatljivije rješenje može se postići kalciniranjem magnezijevog oksida na nižim temperaturama. Ova vrsta MgO-a se kalcinira na temperaturama od 750 do 1000 °C, što rezultira dovoljnom reaktivnošću. U radu je istražen utjecaj MgO-a kalciniranog na nižim temperaturama, metakaolina, letećeg pepela i sadržaja borne kiseline na obradivost, razvoj temperature i tlačnu čvrstoću MPC paste.

Abstract (english)

Magnesium phosphate cements (MPCs) are formed at room temperature by reaction between magnesium oxide (MgO) and an acidic phosphate source. The reaction proceeds rapidly, and retarders such as boric acid are used to control the setting time. Normally, deadburned magnesium oxide, obtained by calcination at 1500 – 2000 °C, is used to produce MPCs. However, a more environmentally friendly solution can be achieved by using lightburned magnesium oxide. This type of MgO is calcined in a temperature range of 750 – 1000 °C, which results in sufficient reactivity. In this study, the influence of light-burned MgO, metakaolin, fly ash, and boric acid content on the workability, temperature, and compressive strength of MPC paste is investigated.

• Keywords: Slabo kalcinirani MgO (LBM); Metakaolin; Leteći pepeo; Borna kiselina
• Keywords (english): Light burned MgO (LBM); Metakaolin; Fly ash; Boric acid
• Language: croatian
• URN:NBN: urn:nbn:hr:237:574415
• 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: 2023-10-30 12:57:17