摻用海砂結構之防蝕處理

CORROSION PROTECTION OF SEA SAND CONTAMINATED CONCRETE STRUCTURE

鋼筋混凝土摻用海砂以致混凝土中氯離子含量過高使得鋼筋生銹、混凝土龜裂、崩裂，影響居住安全及結構安全。摻用海砂的結構物所造成的影響目前已經引起大眾的關切。新的建築物可從管理法規方面著手全力防範類似問題發生。至於已經摻用的鋼筋混凝土結構則需運用各種防蝕方法，以及加強日常維護管理來延長結構物的壽命。本文將介紹各種防蝕方法目前的發展及使用狀況以及日常維護管理的作法，期使海砂摻用對結構物腐蝕及安全所造成的危害降到最低。

The use of sea dredged aggregate in reinforced concrete might cause corrosion of rebar, cracking and spalling of concrete and eventually endanger the safety of structure. Concerns have been arised to address how to prevent further use of sea dredgedaggregate in new structure and to control corrosion of rebar in the existed structure. Through serial of legislation works and construction management, the use of sea dredged aggregate might be prevented. As to the existed tructure, the life may be extended by application of proper corrosion control methods and implementation of maintenance scheme. This paper will introduce various methods and their advantages and limitations on corrosion conrtol of sea sand contaminated concrete stucture.