RESEARCH ON SEWAGE CORROSION RESISTANCE OF ULTRA HIGH PERFORMANCE CONCRETE

In order to solve the problem of premature destruction of concrete drains during sewage treatment, the idea of using ultra high performance concrete (UHPC) instead of ordinary concrete was put forward. For study the feasibility, simulated industrial wastewater solution, inorganic acid solution and organic acid solution were used to simulate sewage condition, the sewage corrosion resistance of UHPC and ordinary concrete were compared. Study result shows UHPC is corrode also, however performs apparently better than ordinary concrete in sewage corrosion resistance. Under organic acid solution that was proved the strongest corrosion solution condition, after 6 months soaking, UHPC still has nearly 70% compressive strength of the pure water condition, while ordinary concrete almost breaking up. The outstanding corrosion resistance against sewage of UHPC due to its dense internal structures and low porosity which could limit the occurrence of corrosion only at the surface. The conclusion was using UHPC instead of ordinary concrete could solve the problem of premature destruction of concrete drains during sewage treatment. Despite UHPC is expensive, the comprehensive cost of UHPC drain pipe in life circle is lower than that made by ordinary concrete due to UHPC drain pipe's thin wall, light weight, longer life and much more lower maintenance frequency.