海砂／海水對水泥砂漿硫酸鹽侵蝕微觀結構變化及抑制策略之研究

Study on the Micro-Structure Change of Sea Sand/Sea Water to Sulfate Attack of Mortar and the Rastraint Strategies

本研究係透過微觀觀測驗證本省南部海砂之特性，並探討最惡劣狀況，即摻加海水拌合之水泥砂漿對巨觀性質可能造成之影響，以提供數據建立資料庫提供工程應用之參考。研究結果顯示海砂、海水其氯離子含量與潛在性問題隨地區不同而異。若強度可能會降低，則可提高設計強度，添加波索蘭材料，使用抗硫水泥等抑制硫酸鹽侵蝕之策略，以確保強度、安全、經濟、品質之目標。

The purpose of this study is to verify the properties of sea sand in the southern Taiwan through micro observation, and to probe that under the worst condition, in other words, when the mortar mixed with sea water is added, the possible effects would happen on the macro properties. Therefore, it can provide data to establish data base for the reference of construction application. The research results indicate that the (Cl-) contain and the implicit problems of sea sand and sea water differ from place to place. If the strength will reduce, then the strength can be designed to increase by adding pozzolanic materials; besides, The strategies to restrain the sulfate attack are used, such as antisulfide cement, to assure the strength, safety, economy, and quality of construction.