Resistance of Blended Cement Paste to Sulfuric Acid Attack and Corrosion Kinetics Analysis

Abstract:

The resistance of blended cement paste to sulfuric acid attack was investigated.Two groups of mixtures were tested,cement with slag only,cement with both slag and silica fume.Mass loss,acid consumption and corrosion depth were measured to analyze the deterioration of blended cement paste in sulfuric acid solution.The results show that the porous corroded layer acts as a protective barrier against the direct contact of the inner cement paste with the acid solution.Kinetic equations of sulfuric acid attack were established in form of d=Ktn ,where d is corrosion depth,t is corrosion time,K and n are fitting coefficients,to predict their corrosion depth at a specific age.It provides a reference for construction design,maintenance and protection.

Key words:blended cementitious material; hardened cement paste; acid resistance; corrosion depth; corrosion kinetics