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High temperature performance of geopolymers as a function of the Si/Al ratio and alkaline media

2021; Elsevier BV; Volume: 311; Linguagem: Inglês

10.1016/j.matlet.2021.131625

1873-4979

Daiane dos Santos da Silva Godinho, Fernando Pelisser, Adriano Michael Bernardin,

Recycling and utilization of industrial and municipal waste in materials production

Geopolymeric cements are thermally stable when their volume, strength and chemical composition do not change after heat treatment. However, the effect of the Si/Al ratio and alkaline media on the geopolymer behavior over 500 °C is not well known. Therefore, the influence of the Si/Al ratio (1.01, 1.31 and 1.79) and the alkaline activator (sodium or potassium) was evaluated in this study under simulated firing conditions (23–1,200 °C). As a result, the geopolymers are stable up to 900 °C, keeping an amorphous structure. At 1,100 °C leucite (K-geopolymers) and nepheline (Na-geopolymers) are formed. Their strength is decreased after heating depending on the Si/Al ratio. The results show the potential use of geopolymeric cements for more efficient structures under fire.