Effects of the initial water curing time on the corrosion behavior of steel bar corrosion in fly ash concrete

摘要：

Concrete specimens made of 30% fly ash (FA) replacement ratio and ordinary Portland cement (OPC) were fabricated to study the effects of the initial water curing time on the corrosion behavior of the embedded steel bar. The specimens were cured in water tank for 5days, 7days, 14days and 28days respectively at a normal temperature of 20℃, then taken out and stored at an indoor natural environment. At the exposure time of 60days, 120days and 180days, steel bars corrosion current densities icorr, corrosion potentials Ecorr in FA and OPC concrete specimens and their electrical resistivities ρc were tested. Results indicate that the initial wet curing time has important effects on steel bars corrosion behaviors in both FA concrete and OPC concrete. With the increase of the initial wet curing time, steel bars icorr all tend to decrease and Ecorr tend to increase. The longer the initial wet curing time, the higher the protective ability of FA concrete, compared to OPC concrete. Under the normal temperature, the shorter initial wet curing time of 5days and 7days for FA concrete showed worse protective ability than OPC concrete. However, when the initial wet curing time surpasses 14days, FA concrete behaves better than OPC concrete.

关键词： fly ash concrete curing time steel bar corrosion

作者: Li Guo Otsuki Nobuaki Yuan Ying-shu

作者单位: State key laboratory for geomechanics and deep underground engineering, School of Architecture and C Tokyo Institute of Technology, Tokyo 152-8552, Japan

会议类型: 国际会议

会议名称: The 6th International Conference on Mining Science & Technology ICMST 2009(第六届国际矿业科学技术大会)

会议地点: 徐州

会议语种:英文

页码: 1-8

在线出版日期: 2009-10-18（万方平台首次上网日期，不代表论文的发表时间）