高性能混凝土抑制中性化之研究

The Study on Restraining the Neutralization of the High Performance Concrete

在理想狀態下，混凝土應具有良好且耐久的工程性質，然受到外在環境或施工等因素影響，混凝土表面易受侵蝕而破壞，甚至於當表面發生龜裂後，二氧化碳使得中性化的現象加速，造成鋼筋的腐蝕速度增快，易引起混凝土耐久性的問題。本研究已摻加適量卜作嵐摻料的高性能混凝土，驗證抑制中性化之策略。結果顯示，以低水膠比之高性能混凝土，界面頗為緻密，卜作嵐反應消耗氫氧化鈣，低滲透性等直接有效的抑制混凝土的中性化，可減低裂縫機率，進而提昇混凝土的耐久特性。

The concrete should have good and durable engineering property under the ideal condition, but due to the environmental or working reasons, the surface is easily corroded, and even cracked to expedite the neutralization by the CO2 and speed the corrosion on steels, and finally to cause the durability problem. This study is mainly to verify the strategy of restraining the neutralization by adding appropriate pozzolanic admixtures to concrete. The result shows the High Performance Concrete (HPC) with low W/B normally has denser surface, consuming the Ca (OH)2 by pozzolanic reaction and low permeability, which are allowed to restrain effectively the neutralization to decrease the cracking for better durability on concrete.