超高性能混凝土抗污水腐蚀性能研究

RESEARCH ON SEWAGE CORROSION RESISTANCE OF ULTRA HIGH PERFORMANCE CONCRETE

为解决混凝土排水管使用过程中受污水腐蚀而过早破坏的问题,提出采用超高性能混凝土(UHPC)替代普通混凝土的技术思路。为研究其可行性,进行了UHPC抗污水腐蚀性能的试验研究。采用模拟工业废水、无机酸、有机酸等三种模拟污水溶液,对比研究UHPC和普通混凝土的抗污水腐蚀性能。研究表明:在三种不同溶液浸泡情况下,UHPC也会受到腐蚀,但其抗污水腐蚀性能要明显优于普通混凝土;在腐蚀最为严重的有机酸溶液中,普通混凝土浸泡6个月后抗压强度几乎丧失,而UHPC还能保持70%的抗压强度;UHPC内部结构十分致密,孔隙率极低,外界腐蚀离子只能通过表层进行腐蚀,这是其具有优异抗污水腐蚀性能的主要原因。以UHPC取代普通混凝土,能够有效解决混凝土排水管易受污水腐蚀、寿命不足的问题。虽然UHPC排水管的材料单价较高,但其壁厚和自重较低、管道寿命大幅延长、维修次数大幅减少,其全寿命周期的综合成本将低于普通混凝土排水管。

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.