Pozzolanic properties of ashes contribute significantly to the consolidation process in geopolymer samples,therefore it is important to test them. There are several testing methods (mechanical and chemical). Within the presented paper we have compared three different methods; determination of mechanical strength index, Frattini test and DTA / TG evaluation of pozzolanic activity . Unlike the determination of the mechanical strenght index where test duration is 3 months, DTA / TG analysis gives quick prediction of pozzolan activities, but unlike the first method, this one does not have (yet) established criteria. Results were presented at the conference Central and Eastern European Committee for Thermal Analysis and Calorimetry (CEEC-TAC3)
F.18 Transfer of new know-how to direct users (seminars, fora, conferences)
COBISS.SI-ID: 2149991This study presents the evalutaion of pore-forming process in geopolymers foams, when two different foaming agents were added to a fly ash based geopolymer-based matrix; aluminium powder, and H2O2. In order to better understand the effect of porosity on the properties of geopolymers, an analysis of porosity, pore size distribution, thickness of walls, pore shape, and pore interconnectedness was performed by means of three-dimensional X-ray micro-tomography (micro-CT), which was supported by a suitable image analysis programme (Avizo). This technique has already been successfully applied in the case of the analysis of ceramic foams, and in the present study, too, it has proved to be an excellent tool for the studying of the microstructure of foams, since it does not interfere with or destructively affect the sample.
F.02 Acquisition of new scientific knowledge
COBISS.SI-ID: 2151271Within COST action NORM4BUILDING we have hosted Prof. Dr. Biljana Angjushevo on STSM (short term scientific meeting). During her stay we have made necessary analysis of coal bottom ash produced from the REK Bitola thermal power plant to assess its suitability for further processing into geopolymer products and/or ceramic products.
F.01 Acquisition of new practical knowledge, information and skills
COBISS.SI-ID: 2154087