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Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Hot-pressed geopolymer
AbstractThis research explores the use of simultaneous heating and pressing techniques in order to enhance the mechanical properties of fly ash (FA) based geopolymer under relatively low temperature conditions to ensure minimum-porosity. Four effective parameters of pressing force, alkali activator/FA, duration of hot-pressing and sodium concentration are studied. Together with detailed experimental studies, our results reveal that the most dominant factor is the induced pressure. The main results indicated that the highest compressive strength of the geopolymer (134MPa) could be obtained by employing the hot pressing, temperature and duration of 41.4MPa, 350°C and 20min, respectively. The microstructure of the hot-pressed specimens showed more developed geopolymer matrix compared with conventional ones leading to higher compressive strength in much shortest time. The improved mechanical properties are generally attributed to the dense structure of the material and higher geopolymer gel production during the hot pressing process. However, further reaction of partially reacted particles improves the mechanical properties over time.
Hot-pressed geopolymer
AbstractThis research explores the use of simultaneous heating and pressing techniques in order to enhance the mechanical properties of fly ash (FA) based geopolymer under relatively low temperature conditions to ensure minimum-porosity. Four effective parameters of pressing force, alkali activator/FA, duration of hot-pressing and sodium concentration are studied. Together with detailed experimental studies, our results reveal that the most dominant factor is the induced pressure. The main results indicated that the highest compressive strength of the geopolymer (134MPa) could be obtained by employing the hot pressing, temperature and duration of 41.4MPa, 350°C and 20min, respectively. The microstructure of the hot-pressed specimens showed more developed geopolymer matrix compared with conventional ones leading to higher compressive strength in much shortest time. The improved mechanical properties are generally attributed to the dense structure of the material and higher geopolymer gel production during the hot pressing process. However, further reaction of partially reacted particles improves the mechanical properties over time.
Hot-pressed geopolymer
Ranjbar, Navid (Autor:in) / Mehrali, Mohammad (Autor:in) / Maheri, Mahmoud R. (Autor:in) / Mehrali, Mehdi (Autor:in)
Cement and Concrete Research ; 100 ; 14-22
09.05.2017
9 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
| British Library Online Contents | 2017
| British Library Online Contents | 2017
| Online Contents | 2017
| British Library Online Contents | 2017
Effects of heat and pressure on hot-pressed geopolymer
| Elsevier | 2019