掺阻锈剂掺合料海水海砂混凝土护筋性探讨

Discussion of Rebar Protecting Properties of Seawater Seasand Concrete Mixed with Admixture and Corrosion Inhibitor

关键词:  海水海砂混凝土  钢筋  极化电位  护筋性  掺合料  阻锈剂

Key words:  seawater seasand concrete  rebar  polarization potential  rebar protecting property  admixture  corrosion inhibitor

摘要:

测试了海水海砂胶砂中钢筋的极化电位和失重率，观察了钢筋的锈蚀情况，研究了不同掺合料和阻锈剂对海水海砂混凝土护筋性的影响.结果表明：粉煤灰、矿渣对海水海砂混凝土护筋性改善作用有限，而偏高岭土的改善作用显著，钢筋极化电位明显正移；阻锈剂中三乙醇胺对海水海砂混凝土护筋性改善作用明显；复掺偏高岭土（20%,质量分数）和三乙醇胺（1.5%,质量分数）后，海水海砂混凝土的护筋性明显提高，钢筋极化电位与淡水标准砂配制的普通混凝土相近，钢筋失重率明显降低，标准养护420d后钢筋无任何锈蚀.

Abstract:

The effect of admixture and corrosion inhibitor on rebar protecting properties of seawater seasand concrete was studied by testing polarization potential and mass loss of rebar in seawater seasand mortar. It is concluded that the fly ash, slag have limited improvement on the rebar protecting properties of seawater seasand concrete whereas metakaolin has a marked effect of improvement. When metakaolin is added, the rebar polarization potential obviously moves to the positive. In addition, triethanolamine corrosion inhibitor has the good effect on improving the rebar protecting properties of seawater seasand concrete. The combination of metakaolin（20%,by mass）and triethanolamine（1.5%,by mass）has an significant effect on the rebar protecting properties of seawater seasand concrete, the rebar polarization potential is the same as the ordinary concrete made with fresh water and sand, rebar mass loss is significantly reduced, rebar cured for 420d is not corroded at all.