奈米矽粉對高性能混凝土滲透性之影響

Influence of Nano-Silica Powder on the Permeability of High Performance Concrete

本研究探討添加奈米矽粉對高性能混凝土滲透性之影響。以水膠比（0.32）與奈米矽粉添加量（1.2%、1.8%、2.4%）為試驗變數，經由紅外線光譜儀與場發射掃描式電子顯微鏡分析奈米矽粉之結構形態，並透過氯離子滲透試驗及電阻試驗進行耐久性探討。奈米矽粉經由紅外線光譜儀與場發射掃描式電子顯微鏡分析，證實為奈米級之Si-O-Si （SiO2 Cage Structure）結構，又奈米矽粉於水泥漿體中係以奈米級顆粒均勻分散，故具有緻密強化效果。由耐久性試驗顯示，奈米矽粉高性能混凝土之電阻值約提升30%至42%，滲透係數則低於100庫侖，即添加奈米矽粉能有效提升高性能混凝土之耐久性。

The purpose of the study is to investigate the durability of high performance concrete contain nano-silica powder (NSHPC). The test variables are water-binder ratio (W/B = 0.32) and the quantity of nano-silica powder added to cement (1.2%, 1.8%, 2.4% by weight). Fourier Transformation Infra-Red (FTIR) and field emission scanning electron microscope (FE-SEM) were applied to analyze the microstructure properties of nano-silica powder, and the study is to investigate the durability by chloride ion penetration test and corrosion rate. The result shows that the nano-silica powder is true nano-SiO2 cage structure and identificated by FTIR and FE-SEM. Also nano-silica powder increases in the cement paste can and has the compact strengthened effect by the nanoparticles even disperser. The durability test increases concrete of resistance value the nano-silica powder to be possible to promote 30% to 42%, the coefficient of penetration then mostly is lower than 100 coulombs, demonstrated nano-silica powder can effectively promote the concrete durability.