Vol.10, No 3, 2012 pp. 245 - 258
UDC 699.86:620.17=111
DOI: 10.2298/FUACE1203245T
CORRELATION BETWEEN MICROSTRUCTURE, PHASE COMPOSITION AND MECHANICAL PROPERTIES OF THERMO-INSULATION BONDING AGENTS BASED ON WASTE MATERIAL
Anja Terzić1#, Ljubica Pavlović2, Jovica Stojanović2, Zagorka Radojević1
1Institute for Materials Testing - IMS, Belgrade, Serbia 2Institute ITNMS, Belgrade, Serbia
E-mail: anja.terzic@institutims.rs
Building composites – thermo-insulating and/or high-temperature resistant bonding agents in which fly ash, as potentially environmentally harmful waste material, is combined with ordinary and refractory cement is new option for reapplication of this waste material. In this study, investigated bonding agents were based on two types of fly ashes from coal combustion process and cements – ordinary Portland cement and high-aluminate cement. Change of mineral phase composition of the composites with increasing temperature was analyzed by means of XRD method. Microstructural changes within investigated composites were investigated by means of scanning electron microscopy (SEM). Macro-performance – mechanical properties of the investigated bonding agents was finally correlated with its microstructure. The investigated bonding agents showed excellent compressive strength, while SEM and XRD analysis indicated its valuable refractory and thermo-insulation properties.
Key words: Portland cement, high-aluminate cement, fly ash, XRD, microstructure, mechanical behavior.
VEZA IZMEĐU MIKROSTRUKTURE, FAZNOG SASTAVA I MEHANIČKIH SVOJSTAVA TERMO-IZOLACIONIH VEZIVA NA BAZI OTPADNOG MATERIJALA
Konstrukcioni kompoziti – termo-izolaciona i/ili visoko-temperaturna veziva u kojima je leteći pepeo, kao potencijalno štetna materija za okolinu, kombinovan sa običnim i vatrostalnim cementom predstavlja jednu sasvim novu mogućnost za reaplikaciju ovog otpadnog materijala. U ovoj studiji, ispitivna su veziva spravljena na bazi dve vrste letećeg pepela dobijenog procesom sagorevanja uglja i dve vrste cementa – obični Portland cement i visoko-aluminatni cement. Promena u mineralnom sastavu kompozita uslovljena povećanjem temperature je analizirana pomoću XRD metode. Mikrostrukturne promene ispitivanih kompozita su utvrđene na osnovu rezultata skening-elektronske mikroskopije (SEM). Makro performanse – mehanička svojstva ispitivanih veziva su povezana sa promenama koje se dešavaju u mikrostrukturi materijala. Ispitivana veziva imaju odlične vrednosti pritisne čvrsoće, a SEM i XRD analiza je ukazala i na potencijalno dobra termo-izolaciona i vatrostalna svojstva ovih materiala.
Ključne reči: Portland cement, visoko-aluminatni cement, leteći pepeo, XRD, mikrostruktura, mehanička svojstva