| Summary: | 碩士 === 中原大學 === 土木工程研究所 === 93 === ABSTRACT
In this research, glass fiber is added to the concrete in order to improve the fragility of the ordinary concrete. Throughout the research, percentage of glass fiber is measured by weight instead of volume. The percentage of glass fiber by weight in this research has three different contents: 0.5%, 1.0% and 1.5%. Experiments show that a 1.0% fiber content produce best results: an increase of 13.6% in compressive strength, 22.44% in flexural strength and 25.81% in of split tensile strength. The resistance against high temperature of glass fiber is examined with SEM analysis. The thermal conductivity of the fiber reinforced concrete is also decreased.
In this research, nano-clay is also added to the concrete with an amount of 0.1%, 0.3% and 0.5% by weight. Due to its nano grain size, voids among the C-S-H can be filled by nano-clay, thus increase the density of the concrete. Hydration degree of concrete is increased due to presence of nano-clay as shown by Loss of Ignition Tests. In the XRD tests, results show that nano-clay reduced the wave peak of calcium hydroxide. This can prove that nano-clay improves pozzolanic reactions.
In aspect of strength of nano-clay concrete, a 0.3% of nano-clay produces a 16.18% increase in compressive strength, and 41.99% increase in split tensile strength. Nano-clay can fill the voids among C-S-H and makes the concrete denser.
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