Abstract: Using small amount of polymer and ordinary processing condition to modify reactive powder concrete (RPC),the modified and unmodified RPC have been compared for their corrosion resistance with the tests of water-dip-in, acid-dip-in and sulphate solution-dip-in and verified by the ruptural and compressive strength loss rate. The results showed that although the strength of RPC is so high, its the water-resistant is not better than OPC mortar; but after polymer modification, the water resistance of RPC could significantly improve. In the anti-acid corrosion aspect, RPC and the polymer modification RPC are all much better than OPC mortar,while the polymer modified RPC is even better than RPC and its strength loss rate is only about 8% when dipped in hydrochloric acid for 90 d. When soaked in 10% Na_2SO_4 solution, the flexural strength of RPC and polymer modified-RPC both appear first increase and then decrease, but polymer modified-RPC has a better sulfate corrosion-resistance. To explain the materials erosion mechanism, the microstructure of materials has been studied with SEM and EDS analysis.

Key words: reactive powder concrete(RPC);polymer modified;water resistance;acid resistance;sulfate resistance