再鹼化技術修復火害後鋼筋混凝土特性的影響

The Effect of Electrochemical Realkalisation Reparation on the Characteristics of Fired-Damaged Reinforced Concrete

林志明(Chih-Ming Lin)

《防蝕工程》 29卷2期 (2015/06) Pp. 59-64

https://doi.org/10.6376/JCCE.201506_29(2).0001

摘要

本研究主要探討利用電化學再鹼技術的修復，對火害後普通強度及高強度兩種鋼筋混凝土性能，包括孔隙率、pH 值抗壓強度及粘結力的影響。電化學再鹼化技術使用1 mol/L之Na_2CO_3 及MgCl_2 水溶液，電流密度1.0 A/m^2，通電時間為7 天。結果顯示，火害後之鋼筋混凝土經本電化學再鹼化修復後，可提高混凝土內之pH值，以Na_2CO_3之效果優於MgCl_2；可降低混凝土的吸水率，MgCl_2 之效果優於Na_2CO_3。兩種電解質對提高火害後混凝土的抗壓強度及粘結力，均沒有顯著的改變。

關鍵字

再鹼化技術 ； 火害鋼筋混凝土 ； 特性

並列摘要

This study investigated the characteristics of fire-damaged normal strength and high strength concretes after repaired by electrochemical realkalisation (ER). The characteristics included porosity, pH value of compressive strength and bond strength. ER was applied by using 1 mol/L Na_2CO_3 and 1 mol/L MgCl_2 solutions with a current density of 1 A/m^2 for 7 days. The results show that the pH value of fire-damaged concrete after repaired by ER can be raised, in which Na_2CO_3 is better than MgCl_2. For reducing water absorption of concrete, MgCl_2 is better than Na_2CO_3. The two electrolytes have no significant improvement on the compressive strength and bond strength of the fire-damaged concrete after repaired by ER.

並列關鍵字

Electrochemical realkalisation ； Fire-damaged reinforced concrete ； Characteristics