An investigation of the microstructure and durability of a fluidized bed fly ash–metakaolin geopolymer after heat and acid exposure

摘要: Abstract This study aims to investigate durability and microstructure of fluidized bed fly ash metakaolin based geopolymer exposed elevated temperatures acid attack. Geopolymer specimens were prepared by combination activated sodium silicate hydroxide solutions cured in microwave radiation environment plus a heat curing period. Compressive strength several key parameters for ordinary Portland cement (OPC) assessed compared. Microstructure formation development was characterized terms morphology pore structure as well simulation. The experimental results reveal dense compared OPC. In resistance the acidic solution temperatures, is superior OPC indicated relatively lower loss mass change. shows dramatic drop while increase after 400 °C. curves are similar OPC, but it result saturated water absorption 28 days indicates less before thermal exposure. Durability demonstrated monitoring structure.