Obiettivo The aim of the research is to provide qualitative and quantitative insight into the underlying phenomena of strength and durability of both pure gypsum and gypsum reacted with pozzolanic materials. Such a basic materials science knowledge is required for an expansion of gypsum applications in the building industry. It has been shown that it is possible to produce compacted gypsum with a low porosity and a high strength on a laboratory scale by uniaxial compaction of flue gas desulphurization (FGD) gypsum powder. Compacted FGD gypsum cylinders were produced at a compaction pressure between 21% and 6% by volume and having a compressive strength between 20 and 96 MPa. Compaction of dry gypsum powder was not successful. It is necessary to add, dependent on compaction pressure, a few per cent of water to achieve suitable density and strength properties.Notably the microstructure of compacted gypsum is completely different to that of cast gypsum. While cast gypsum consists of a network of intergrown fine acicular crystals, in compacted gypsum coarse granular crystals are aligned boundary to boundary without much intergrowth. Microstructural examinations showed that an increase in compaction pressure causes better boundary to boundary packing, preferred orientation of grains perpendicular to the compaction direction, breaking of grains and an increase in grain deformation which was indicated by microcracking and undulatory extinction. Campo scientifico agricultural sciencesagriculture, forestry, and fisheriesagriculturegrains and oilseeds Programma(i) FP2-BRITE/EURAM 1 - Specific research and technological development programme (EEC) in the fields of industrial manufacturing technologies and advanced materials applications (BRITE/EURAM), 1989-1992 Argomento(i) Data not available Invito a presentare proposte Data not available Meccanismo di finanziamento Data not available Coordinatore Nederlandse Organisatie voor Toegepast Natuurwetenschappelijk Onderzoek Contributo UE Nessun dato Indirizzo Lange Kleiweg 5 49 2288 GH RIJSWIJK Paesi Bassi Mostra sulla mappa Costo totale Nessun dato Partecipanti (3) Classifica in ordine alfabetico Classifica per Contributo UE Espandi tutto Riduci tutto Bouwcentrum Beheer BV Paesi Bassi Contributo UE Nessun dato Indirizzo Ambachtsweg 2 1678 3600 BR MAARSEEN Mostra sulla mappa Costo totale Nessun dato Centre Experimental de Recherches et d'Études du Bâtiment et des Travaux Publics (CEBTP) Francia Contributo UE Nessun dato Indirizzo Domaine de Saint-Paul 78470 Saint-Rémy-les-Chèvreuses Mostra sulla mappa Costo totale Nessun dato University of Utrecht Paesi Bassi Contributo UE Nessun dato Indirizzo Budapestlaan 4 80021 3508 TA UTRECHT Mostra sulla mappa Costo totale Nessun dato
