Center of Excellence Geopolymer and Green Technology (CEGeoGTech), School of Materials Engineering, Universiti Malaysia Perlis (UniMAP), 01000, P.O. Box 77, D/A Pejabat Pos Besar, Kangar, Perlis, Malaysia.
Faculty of Engineering Technology, Universiti Malaysia Perlis (UniMAP), P.O. Box 77, D/A Pejabat Pos Besar, Kangar, Perlis 01000, Malaysia.
Sci Rep. 2017 Mar 27;7:45355. doi: 10.1038/srep45355.
This paper presents a comparative study of the characteristic of unfoamed and foamed geopolymers after exposure to elevated temperatures (200-800 °C). Unfoamed geopolymers were produced with Class F fly ash and sodium hydroxide and liquid sodium silicate. Porous geopolymers were prepared by foaming with hydrogen peroxide. Unfoamed geopolymers possessed excellent strength of 44.2 MPa and degraded 34% to 15 MPa in foamed geopolymers. The strength of unfoamed geopolymers decreased to 5 MPa with increasing temperature up to 800 °C. Foamed geopolymers behaved differently whereby they deteriorated to 3 MPa at 400 °C and increased up to 11 MPa at 800 °C. Even so, the geopolymers could withstand high temperature without any disintegration and spalling up to 800 °C. The formation of crystalline phases at higher temperature was observed deteriorating the strength of unfoamed geopolymers but enhance the strength of foamed geopolymers. In comparison, foamed geopolymer had better thermal resistance than unfoamed geopolymers as pores provide rooms to counteract the internal damage.
本文对在高温（200-800°C）下暴露后的无泡和发泡地质聚合物的特性进行了比较研究。无泡地质聚合物是用 F 级粉煤灰、氢氧化钠和液态硅酸钠制成的。多孔地质聚合物是通过过氧化氢发泡制备的。无泡地质聚合物的强度为 44.2MPa，在发泡地质聚合物中降解 34%至 15MPa。无泡地质聚合物的强度随着温度升高到 800°C而下降到 5MPa。发泡地质聚合物的行为则不同，在 400°C时恶化到 3MPa，在 800°C时增加到 11MPa。即便如此，这些地质聚合物在高达 800°C的温度下仍能承受高温而不发生任何崩解和剥落。在较高温度下观察到结晶相的形成，这降低了无泡地质聚合物的强度，但增强了发泡地质聚合物的强度。相比之下，发泡地质聚合物比无泡地质聚合物具有更好的耐热性，因为孔隙为抵消内部损伤提供了空间。
