奈米矽粉與不同水膠比對高性能混凝土抗強酸鹼侵蝕能力之影響

Influence of Water-binder Ratio and Nano-silica Powder on the Anti-corrosion Ability of HPC under Strong Acid and Alkali

本研究係探討不同水膠比與奈米矽粉對高性能混凝土抵抗強酸鹼侵蝕能力之影響，研究變數為水膠比（0.24、0.31、0.38）與奈米矽粉添加量（0、2%）；試體養護28天後再分別置於飽和石灰水、強酸與強鹼環境，於齡期56、91與120天進行各項試驗。結果顯示，在飽和石灰水環境下，高性能混凝土水膠比愈低、拌合水量愈少，具較佳力學性質；添加奈米矽粉於高性能混凝土中，將更有效提昇高性能混凝土力學性質與耐久性質。在強鹼環境中，各配比電阻值依然呈現高抗蝕的特性，顯示混凝土受強鹼環境影響的程度相當輕微；於強酸環境中，以水膠比0.24、添加奈米矽粉之高性能混凝土，具有最佳之抵抗強酸侵蝕能力。

This paper presents a study on the anti-corrosion ability of various water-binder ratio High Performance Concrete Containing Nano-silica Powder (NSHPC) under strong acid and alkali attack. The parameters are water-binder ratio (W/B = 0.24, 0.31 and 0.38) and varying content of nano-silica powder (0 % and 2 %). After 28 days of curing, the mixes will be separated into saturated limewater, strong acid and alkali solutions; and all experiments will proceed at 56, 91 and 120 days. The results show the less of the water-binder ratio and mixing water amount of High Performance Concrete (HPC) will make better mechanical properties in saturated limewater solution. Adding nano-silica powder in HPC will raise the mechanical properties and durability of HPC more effectively. Under strong alkali environment, the resistivity of all batches is still high. It is obvious that the effect of strong alkali solution to concrete is slight. The anti-corrosion ability of HPC (W/B = 0.24、adding nano-silica powder) under strong acid attack is the best.