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Measurement of Sulfate-ion Content in Concrete Attacked by Sodium Sulfate

Zhao Shunbo1,Chen Jihao1,Gao Rundong2,Li Qingbin2(1.School of Civil Engineering and Communication,North China University of WaterConservancy and Electric Power,Zhengzhou Henan 450011,China;2.State Key Laboratoryof Hydroscience and Engineering,Tsinghua University,Beijing 100084,China)  
Based on the current test methods and successfully practice,a set of methods are proposed for measuring the sulfate content in concrete layers from surface to inside attacked by sodium sulfate solution.The main processes include that of drilling the core sample from the specimen,cutting the core sample into slices,pulverizing the slices into powder layer by layer,accurately weighting the powder samples and determining the sulfate-ion concentrations of every layer samples by the improved barium sulfate gravimetric method.Finally,the erosion depth and the distribution of sulfate-ion content in concrete from surface to inside can be known.It provides a test method to study the mechanism of concrete attacked by sodium sulfate.
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