• Annune Jighjigh Eric
• Ocholi M.
• Shawon. M.C
• Ahmed Y.A

This study investigates the behavior of concrete produced with pozzolanic additives in the presence of sulphate ion containing solution. Pozzolanic admixtures of micro and nano size silica and biomass ashes were used in this study. The investigation was carried out by X-ray diffraction, Hg absorption porosimetry and optical microscopy. The crystalline phases at all depths of the specimen, mass change, and porosity were investigated after the exposure of concrete in sulphate ions containing solution for a period of 1-6 months under static conditions. Results revealed that the pozzolanic additives seem to activate the process of mineralization and acting both as cementitious admixture as well as fine filler. X-ray phase analysis of specimens at different depths after exposure in solution showed the formation of gypsum in specimen with additives only up to10 mm. The addition of fine dispersed additives decreases the number of pores in all range, but more strongly in the 1-103μm range. Cementitious properties of pozzolanic materials and crystallization of sulphate salt in pores decrease the number of pores in the range 0.5-10-3μm.This study has therefore shown that the pozzolanic additives reduce porosity, increase density and as a consequence increase the chemical durability of concrete in the presence of sulphate ion containing solution.

concrete; pozzolana; additives; chemical composition; durability; chemical corrosion; porosity; crystalline phase.

"Investigating the chemical durability of concrete produced with pozzolanic additives", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.9, Issue 2, page no.b354-b360, February-2022, Available :http://www.jetir.org/papers/JETIR2202138.pdf

"Investigating the chemical durability of concrete produced with pozzolanic additives", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.9, Issue 2, page no. ppb354-b360, February-2022, Available at : http://www.jetir.org/papers/JETIR2202138.pdf