Abstract

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Title:: Research on Concrete Sulfuric Acid Resistance with Different Types of Coarse and Fine Aggregates

Author(s):: XIAO Jie; QU Wen-jun; ZHU Peng; Department of Structural Engineering, Tongji University

Keywords:: calcareous aggregate; siliceous aggregate; sulfuric acid attack; concrete; corrosion depth

Abstract:: In order to compare the impact of fine and coarse aggregates on concrete sulfuric acid resistance, accelerated corrosion experiment was conducted with four types of aggregate concretes composed of coarse and fine aggregates (gravel and river sand, gravel and marble sand, marble stone and river sand, marble stone and marble sand) and same water cement ratio of 0.45 and 100×200. The concrete specimens were kept in sulfuric acid solution with pH value range around 0.95, and 12 times continuous monitoring tests were carried in 194 d. The corrosion depth was calculated based on the monitoring data. The corrosion rates of the four types of concretes were sorted in descending by the slope. The results show that concrete with marble aggregates rich in calcium carbonate has better performance in sulfuric acid solution than that with inert aggregates (gravel and river sand).Corrosion depth is linear with corrosion time when concrete sulfuric acid corrosion layer is interrupted. Moreover, the marble fine aggregate plays more important role on reducing concrete sulfuric acid corrosion depth than marble coarse aggregate.