Resistance to Carbonation of Concrete Treated by Superabsorbent Resin Synthesized In Situ
Carbonation is one of the key factors that result in the corrosion of the reinforcing steel embedded in concrete. In this work, a novel method to improve the resistance to carbonation of concrete was presented, i.e. the surface of the concrete specimens were treated by Super-absorbent resin (SAR) synthesized in situ, the prepolymer solution of poly (acrylic acid-co-acrylamide) with initiator and crosslinker was impregnated in the capillary-pores of concrete, then the acrylic acid and acrylamide copolymer by self-crosslingking under the initiator to synthesize SAR of poly (acrylic acid-co-acrylamide). The backbone of SAR is characterized by FTIR spectrum; the resistance to carbonation of the concrete with and without treatment by SAR was studied and the carbonation depth of concrete after the accelerated carbonation testing was measured. The results show that the concrete specimens treated with SAR have higher resistance to carbonation than that of the blank concrete specimens due to the synthesized SAR being swollen after absorbing water, filling the capillary-pores of concrete and reducing the ingress of CO2 and H2O.
Hui Li, Yan Feng Liu, Ming Guo, Rui Zhang and Jing Du
X. F. Song and T. S. He, "Resistance to Carbonation of Concrete Treated by Superabsorbent Resin Synthesized In Situ", Advanced Materials Research, Vols. 374-377, pp. 1872-1876, 2012