Characterization and Steel Corrosion of Cement Produced from Incinerator Ashes

焚烧炉灰烬水泥的表征及钢材腐蚀

基本信息

批准号：
11650465
负责人：
TORII Kazuyuki
金额：
$ 2.5万
依托单位：
Kanazawa University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1999
资助国家：
日本
起止时间：
1999 至 2000
项目状态：
已结题

项目摘要

Ecocement is a new type of hydraulic cement produced from incinerator ash. However. the incinerator ash contains large amounts of chloride, which, if not removed during the production process, is expected to accelerate the corrosion of steel bars when ecocement is used in reinforced concrete structures. The chlorides can be removed in the production process but at a high cost. Two types of ecocement have been produced, a high chloride type (type I) and a low chloride (type II). This paper investigates the corrosive behavior of steel bars embedded in the mortars containing both types of ecocement, cured under and exposed to wetting and drying cycles. Corrosion of the mild steel bars was monitored by halfcell potential, polarization resistance, and AC impedance measurements. The relative performance of the two types of ecocements with respect to the corrosive behavior of the embedded steel bars was discussed.From the results, the following conclusions could be drawn.(1) Steel bars embedded in mortars of high-chloride type ecocement is more susceptible to corrosion than that of low-chloride type one.(2) Carbonation accelerates corrosion of steel bars embedded in the mortars of both ecocements, although the effect is higher in high-chloride type than in low-chloride type.(3) Electrical measurement yields a good result in the monitoring of corrosion of steel bars embedded in cement mortars.(4) In both types of ecocement, the extent and severity of the corrsion of the embedded steel bars depend on the water to cement ratio, the higher the water to cement ratio, the greater the severity of corrosion.

Ecocement是一种由焚化炉产生的新型液压水泥。然而。焚化炉中含有大量的氯化物，如果在生产过程中未去除，则预计当将凝聚用于钢筋混凝土结构时，将加速钢条的腐蚀。可以在生产过程中除去氯化物，但成本很高。已经产生了两种类型的凝聚，一种高氯化物类型（I型）和低氯化物（II型）。本文研究了包含两种类型的Ecocement，固化并暴露于润湿和干燥周期的砂浆中的钢棒的腐蚀行为。通过半循环电位，抗极化性和AC阻抗测量值监测低碳钢棒的腐蚀。讨论了两种类型的生态配置相对于嵌入式钢棒的腐蚀行为的相对性能。从结果开始，可以得出以下结论。（1）嵌入在高氯化物类型的生态配置迫击炮剂中的钢条比腐蚀更容易易感的腐蚀性，而不是腐蚀的远端。燃料，尽管高氯化物类型的影响高于低氯化物类型。（3）电测量在监测嵌入水泥砂浆中的钢棒腐蚀的良好结果。（4）两种类型的凝集中的钢棒，较高的水条的含量均取决于水的含量，水均取决于水的水平较高，水均取决于水的水平，水均高于水的水平。腐蚀。