Effects of chemical composition of amorphous phase on the reactivity of phosphoric acid activation of volcanic ashes

•Volcanic ashes with differences in mass percentages (MP) of oxides in chemical compositions of amorphous phase (AP) were activated by phosphoric acid (PA).•AP was meanly composed of SiO2, Al2O3,Fe2O3, CaO and MgO oxides.•Heat released and initial setting time correlated with the sum of mass percent...

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Bibliographic Details
Published in:Journal of non-crystalline solids 2022-01, Vol.575, p.121213, Article 121213
Main Authors: Pougnong, Thierry Ebenizer, Belibi, Placide Desiré Belibi, Baenla, Jean, Thamer, Alomayri, Tiffo, Emmanuel, Elimbi, Antoine
Format: Article
Language:English
Subjects:
Amorphous phase composition
Compressive strength
Inorganic aluminosilicate-based phosphate polymers
Setting time
Volcanic ash
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Summary:•Volcanic ashes with differences in mass percentages (MP) of oxides in chemical compositions of amorphous phase (AP) were activated by phosphoric acid (PA).•AP was meanly composed of SiO2, Al2O3,Fe2O3, CaO and MgO oxides.•Heat released and initial setting time correlated with the sum of mass percentages (SMP) of Al2O3, Fe2O3, CaO and MgO.•MP of Al2O3 and Fe2O3 and concentration of PA plaid key roles on values of compressive strength.•Qualitative and quantitative compositions of AP are useful getting appreciable view on volcanic ash reactivity. Two volcanic ashes with differences in mass percentages of oxides in chemical composition of amorphous phase were activated by phosphoric acid (P2O5 / H2O molar ratios between 0.04 and 0.15). Amorphous phase was mainly composed of SiO2, Al2O3, CaO, MgO and Fe2O3 oxides. Heat released and initial setting time correlated with the sum of mass percentages (SMP) of Al2O3, Fe2O3, CaO and MgO oxides of amorphous phase: the greater the SMP, the greater was heat released and the lower was initial setting time. Compressive strength increased with the increase of P2O5 / H2O molar ratio up to a limit. Mass percentages of Al2O3 and Fe2O3 in amorphous phase along with P2O5 / H2O molar ratios plaid key roles on the variation and the highest value of compressive strength. Qualitative and quantitative determinations of chemical composition of amorphous phase of volcanic ash are useful parameters allowing getting appreciable view of its reactivity.
ISSN:0022-3093
1873-4812
DOI:10.1016/j.jnoncrysol.2021.121213