A novel method to improve sulfate resistance of concrete by surface treatment with Super-absorbent Resin synthesized in situ

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• Affiliation of Author(s):材料科学与工程学院
• Journal:Magazine of concrete researche
• Key Words:中文关键字：混凝土； 硫酸盐腐蚀； 吸水性树脂，英文关键字：concrete; sulfate resistance; poly (acrylic acid-c
• Abstract:Sulfate attack is a key factor that results in the deterioration of concrete. In this work, a novel method to improve the sulfate resistance of concrete by surface treatment with Super-absorbent Resin (SAR) synthesized in situ was presented, i.e., the precursor solution of poly (acrylic acid-co-acrylamide) is soaked into the capillary-pores of hardened concrete, initiated by infrared radiation and synthesized SAR, then the swollen SAR absorbs water and fills capillary-pores to cut off the penetration pipes of external sulfates. The performances of SAR synthesized in situ were characterized by swelling ratio for deionized water and 5% sodium sulfate solution. The osmosis of SO42- in cement mortar was compared before and after treated by SAR. The sulfate corrosion characteristics of cement mortar were confirmed by scanning electron microscopy (SEM) and X-ray diffraction. The laboratory testing results indicate that the SAR has high swelling ratio, and the swollen SAR adhered to the capillary-pores of cement mortar can evidently reduce the osmosis of SO42- in cement mortar. After being subjected to sodium sulfate attack, the cement mortar specimens treated by SAR have not been severely deteriorated.
• Note:宋学锋
• First Author:hetingshu,songxuefeng
• Indexed by:Journal paper
• Volume:卷：60
• Issue:期：1
• Page Number:页：49-55
• Translation or Not:no
• Date of Publication:2008-02-01