添加玻璃纖維與奈米粘土對高溫下混凝土強度之影響

A Study on the Thermal Effects on Glass Fiber Reinforced Concrete and Nano Clay Concrete

游翔淵(Yu-Shiang Yuan)

指導教授 ： 何仲明

中原大學/工學院/土木工程研究所/碩士(2005年)

https://doi.org/10.6840/cycu200500369

摘要

摘 要
為改善混凝土脆性的缺點，在混凝土中加入玻璃纖維，對於以往文獻中採體積比方式，本研究採用水泥重百分比方式添加0.5%、1.0%、1.5%之玻璃纖維，其中以添加1%玻璃纖維之抗壓強度為最佳，較未加玻璃纖維之混凝土高出13.6%，抗彎強度增加22.44%，劈裂度增加25.81%，且SEM分析中亦可看出玻璃纖維抵抗高溫的能力，且加入玻璃纖維之混凝土，熱傳導係數也有下降的趨勢。
本研究添加水泥重量之0.1%、0.3%、0.5%之奈米粘土於混凝土中，因其達奈米級尺寸，可填充C-S-H膠體孔隙，使混凝土更加緻密，由燒失量的分析，證實加入奈米粘土增加了混凝土的水化程度，XRD分析中亦因奈米粘土加入，降低氫氧化鈣的波峰，得知奈米粘土有參與卜作蘭反應。其中以添加0.3%奈米粘土為最佳，其抗壓強度、劈裂強度則分別增加了16.18%、41.99 %，SEM分析亦看出奈米粘土存在於C-S-H中使結構更緻密。

關鍵字

玻璃纖維 ； 奈米粘土 ； XRD ； SEM ； 抗彎強度 ； 劈裂強度

並列摘要

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.

並列關鍵字

SEM ； flexural strength ； Glass fiber ； nano-clay ； XRD ； split tensile strength

參考文獻

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