Abstract
A new method for incorporating fly ash in construction technology was developed by the production of boroaluminosilicate geopolymers. This new class of geopolymers was appropriately synthesized from mixtures of fly ash and anhydrous borax and compressive strengths as high as 64MPa were attainable by using a suitable amount of borax. Different types of microstructures were observed by changing the mixture proportion of the specimens. All specimens revealed a brittle fracture without any crack-branching in the mixture. Additionally, fewer unreacted fly ash particles were observed in the considered pastes indicating an entirely different fracture mechanism in boroaluminosilicate geopolymers on aluminosilicate ones. Fourier transform infrared spectroscopy analyses of the mixtures revealed an additional B–O bond compared with aluminosilicate geopolymers. It was shown that this bond is a key factor in determining compressive strength of specimens where those without any B–O bond had the lowest strength. A plan to study other critical properties of these types of binder has been suggested at the end.
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