奈米材料對混凝土性質影響之研究

A study of the Effect of Nanomaterials on Properties of Concrete

蔡正發(Cheng-Fa Tsai)

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/cycu200500385

摘要

摘 要
本文目的主要在探討奈米黏土替代水泥在混凝土之可行性，添加奈米含量之後的混凝土機械性質、熱傳導性質及化學性質是否與傳統混凝土不同，並比較不同奈米含量、不同水灰比對混凝土抗壓強度及熱傳導係數之影響。利用SEM來觀察水泥漿體之水化物生成情況，同時也做水泥漿體之燒失量試驗，可以由公式求得燒失量及水化程度。
試驗結果顯示，混凝土加入奈米黏土含量在0.3%及0.5%時有較強的抗壓強度；混凝土的熱傳導係數與混凝土抗壓強度息息相關，抗壓強度越強，熱傳導係數亦越高，水灰比的增加，會使混凝土之抗壓強度減少，因此熱傳導係數就會降低；由SEM及燒失量試驗可以得知奈米黏土可以產生卜作嵐反應，使C-S-H膠體生成更多更密，進而增加混凝土之抗壓強度，添加奈米材料對混凝土的熱學性質並沒有影響。

關鍵字

SEM ； 熱傳導係數 ； 批土 ； 燒失量 ； 高溫 ； 奈米

並列摘要

ABSTRACT
This paper studies the feasibility of adding nano-clay into the ordinary concrete. The compressive strength and the coefficient of thermo- conductivity of concrete with different nano-clay content and different water cement ratios are compared. There are two water cement ratios of 0.4 and 0.5; and four different nano-clay contents, namely 0%, 0.1%, 0.3% and 0.5%.
The heat insulation property of the cement mortar is also tested. Cement mortar mixed with nano-clay is used as plaster to cover the heated surface of the concrete. The thickness and proportions of cement mortar are studied. The method of loss of ignition is used to obtain the ignition loss caused by fire-damaged and the hydration degree of nano-clay concrete.
Nano-clay used in this research adds is a kind of new material. After the compressive strength test of the concrete and take out the grout body.
The results show that, concrete with 0.3% and 0.5% nano-clay produce better strength than 0% and 0.1%. Coefficient of thermo-conductivity of concrete is closely linked with compressive strength of concrete. When compressive strength is stronger, coefficient of thermo-conductivity will be higher. Increase the water cement ratio can decrease the compressive strength of concrete and the coefficient of thermo-conductivity will be reduced as well. According to experimental data, the thermo-conductivity of concrete is not affected by amount of nano-clay added. Since only a very small amount of nano-clay is added, the speciality found in most nano-materials was not produced in this research.

並列關鍵字

loss of ignition ； coefficient of thermo-conductivity ； nano ； high temperature

參考文獻

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