Alkalno aktivirana mineralna veziva

master's thesis

• Title (english): Alcali activated mineral binders
• Author: Marko Batrac
• Mentor: Juraj Šipušić (mentor)
• Committee member: Juraj Šipušić (predsjednik povjerenstva)
• Committee member: Jelena Macan (član povjerenstva)
• Committee member: Davor Dolar (član povjerenstva)
• Granter: University of Zagreb; Faculty of Chemical Engineering and Technology; Zagreb
• Defense date and country: 2015-07-14, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Basic Technical Sciences; Materials

Abstract

Anorganska mineralna veziva po definiciji predstavljaju tvari, anorganskog mineralnog podrijetla, koje pomiješane s vodom djelovanjem fizikalno kemijskih procesa tijekom vremena stvrdnjavaju ili vežu u krutu kamenu sličnu tvorevinu određene čvrstoće.
Hidratacija portland i portland bijelog cementa, aluminatnog cementa te vapna praćena je mjerenjem razlike potencijala između dvije elektrode u doticaju sa cementnom pastom. Istraženi su sljedeći materijali elektroda: nikal, volfram, te grafit. Također je ispitan utjecaj temperature na mjereni potencijal elektrode. Elektroda od volframa je osjetljiva na pH otopine, a promjena potencijala kvalitativno odgovara brzini razvoja topline hidratacije. Napon termoparova na doticaju raznih materijala je zanemariv prema promjeni potencijala sa promjenom temperature cementne paste. Mjerenje potencijala elektrode tijekom vezanja i očvršćivanja cementne paste je jednostavna metoda koja ne oštećuje uzorak, te ju je moguće koristiti u istraživačkom laboratoriju i u praksi. Par elektroda volfram-nikal ne pokazuje promjenu potencijala sa temperaturom. Da bi bilo moguće praćenje promjene potencijala sa temperaturom potrebno je koristiti par elektroda poluvodič-metal kao grafit-volfram te grafit-nikal.

Abstract (english)

Inorganic mineral binders, by definition, are substances, inorganic mineral origin, which, when mixed with water action of physicochemical processes over time cure or bind to solid stone similar creation of certain strength.
Portland cement, white portland cement, aluminous cement and lime setting and hardening had been studied by electrochemical measurements the potential difference between two metal electrodes in contact with the cement paste. The following electrodes materials were tested: nickel, wolfram and graphite. Potential changes due to imposed temperature changes had been also studied. Wolfram electrode is sensitive to pH changes and its potential change qualitatively corresponds to the rate of heat liberation curve. Thermocouple voltages at different conductors contact is insignificant compared to the potential changes caused by temperature changes of cement paste. Measurement of electrode potentials during cement setting and hardening enables easy and nondestructive way of cement characterization in laboratory and field measurements. A pair of electrodes wolfram-nickel does not show potential change with temperature. To make it possible to track changes potential with the temperature it is necessary to use a pair of electrodes of semiconductor-metal such as graphite-nickel and graphite-wolfram.

• Keywords: portland cement; bijeli portland cement; aluminatni cement; vapno; hidratacija; potencijal elektrode; pH
• Keywords (english): portland cement; white portland cement; aluminous cement; lime; hydration; the electrode potential; pH
• Language: croatian
• URN:NBN: urn:nbn:hr:149:115003
• Study programme: Title: Environmental Engineering - Graduate study; Study programme type: university; Study level: graduate; Academic / professional title: magistar/magistra inženjer/inženjerka ekoinženjerstva (magistar/magistra inženjer/inženjerka ekoinženjerstva)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2016-12-20 11:13:03