高溫對玻璃纖維混凝土影響之研究

A Study On The Thermal Efect On Glass-Fiber Reinforced Concrete

周志遠(Chih-Yan Chou)

指導教授 ： 何仲明

中原大學/工學院/土木工程研究所/碩士(2004年)

https://doi.org/10.6840/cycu200400340

摘要

摘 要
本文針對高溫對玻璃纖維混凝土影響之研究。由於高溫會使混凝土產生龜裂，使內部鋼筋更容易中性化，而減低其強度，所以如果可以利用玻璃纖維的特性減少裂縫發生，不僅可以增加混凝土抗壓強度，抗撓強度，更可以降低其熱傳導係數，避免混凝土在受火害後抗壓強度衰減太多。
在本文中，實驗分玻璃纖維混凝土之強度發展（7天、14天、21天、28天、49天、56天），抗彎強度，試體受火害後之抗壓強度和玻璃纖維混凝土之熱傳導係數，而變數則有0.5％、1.0％、1.5％三種玻璃纖維含量，2.54㎝、0.6㎝兩種長度的玻璃纖維，受五種火害溫度（440℃、500℃、580℃、800℃、1000）。
研究結果顯示，在加入適量的玻璃纖維後，可以有效地增加混凝土強度，在抗壓強度、抗撓強度、受火害後強度和熱傳導係數方面都可以更進一步增強其效能，但需要注意所添加的玻璃纖維含量，當含量過高時，反而會有害於混凝土強度。

關鍵字

熱傳導係數 ； 玻璃纖維 ； 高溫 ； 混凝土 ； 火害

並列摘要

Abstract
This experiment is to study the thermal effect on glass-fiber reinforced concrete. Because high temperature will result concrete chap and reinforced bar decreased in strength, so we take advantage of quality of glass-fiber to decrease cracks to occur. This not only can increase the compressive strength and bending strength of concrete but also increase the coefficient of thermal-conductivity. So, this can avoid the decrease in strength of concrete after fire damaged.
This study includes the development of compressive strength of glass-fiber reinforced concrete (7days, 14 days, 21 days, 28 days, 49 days, 56 days), the bending strength, the compressive strength of glass-fiber reinforced concrete after fire damaged and the coefficient of thermal-conductivity of glass-fiber reinforced concrete. The parameters considered in this study are the glass-fiber content（0.5％, 1.0％, 1.5％）and the glass-fiber length（0.6mm, 2.54cm）and the temperature of fire damaged（440℃, 500℃, 580℃, 800℃, 1000℃）.
The study results show that, with suitable content of glass-fiber, the glass-fiber reinforced concrete will increase effectively in compressive strength, bending strength, the compressive strength after fire damaged and decrease in the coefficient of thermo-conductivity. But when too much glass-fiber is put into concrete, the compressive strength will decrease.

並列關鍵字

Fire Damaged ； Glass-Fiber ； Coefficient of Thermal-Conductivity. ； Concrete ； High Temperature

參考文獻

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