| Summary: | 碩士 === 國立高雄應用科技大學 === 土木工程與防災科技研究所 === 94 === The concrete structures in chemical factories are often attacked by acid and alkali. This may cause the deterioration of concrete, decrease of the survival of structures and increase of the cost of maintenance. The purpose of this research is to investigate the properties of High Performance Concrete Containing Nano-silica Powder (NSHPC) under the corrosion of acid and alkali. In the first part of this disertation, we regulate the paste amount of concrete (n=1.3); 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%). Secondly, we regulate the Water-binder ratio (W/B=0.38); the parameters are paste amount (n=1.1, 1.3 and 1.5) and varying content of Nano-silica powder (0% and 2%). We also compare with Ordinary Portland Concrete (OPC, the design strength is 350 Kg/cm2). The test included Rapid resistance of acid and alkali, compressive strength, ultrasonic wave propagation velocity measurement, electrical resistivity, rapid chloride ion penetration test and Field emission scanning electron microscope (FE-SEM). The results show that the less of the Water-binder ratio and paste amount of High Performance Concrete (HPC) will make the better mechanical properties, low permeability, higher electrical resistivity and better anti-corrosion ability; while the anti-corrosion ability of OPC is bad. The adding of Nano-silica powder in HPC will raise the workability and anti-corrosion ability of HPC more effectively. After the hydration of Nano-silica powder, it will form Calcium Silicate Hydrate (C-S-H) gel and fill concrete pore making concrete densified. Namely, NSHPC owns fine anti-corrosion ability under acid and alkali attack.
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