Influence of Calcined Shale on Sulphate Corrosion Resistance of Cement

Abstract

According to the cement sulfate corrosion resistance properties of Portland cement mixed burning shale to determine the erosion test method, and analyzes the influence of different system of calcined shale sulphate corrosion resistance properties of Portland cement. The results show that: calcined shale during 800 to 900 ℃, 60min ~ 120min mixed into Portland cement, can improve the sulfate resistance of cement resistance in different degree, shale calcined during 850 ℃and 120min mixed into Portland cement, corrosion resistance coefficient of cement is 1.25. Through XRD testing means, hydrate of hardened cement paste are analyzed, compared with Portland cement mixed with calcined shale, visible after C-S-H diffraction peaks of cement hydrates phase enhancement, and Ca(OH) 2 peak decreased. Using the scanning electron microscope on the part of the corrosion morphology after mortar were observed, visible cement stone in Aft generation, generation of a small amount of Aft to make the structure of cement stone is more compact, beneficial to improve the ability of anti penetration.