再生混凝土中添加奈米黏土及高爐石粉性質之研究

A study of the performance of recycled concrete with nanoclay and slag powder

林川瑜(Chuan-Yu Lin)

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/cycu200500389

摘要

為了提升再生混凝土之性能，讓再生混凝土之使用範圍更廣泛。本研究先以添加奈米黏土及高爐石粉，目的在使再生混凝土更加緻密，以提升其普通抗壓強度以及高溫受熱後之殘餘強度。
接著以直接添加奈米黏土於再生混凝土中，與將奈米黏土添加入水泥砂漿中，以批土方式批覆在熱傳導試體之加熱面，兩相作比較，試圖將奈米黏土之耐火特性及其經濟價值作一最佳利用。
研究結果發現，添加奈米黏土及高爐石粉均可有效的提升再生混凝土之抗壓強度，但添加高爐石粉使再生混凝土有較好的效果，且在高溫受熱後，殘餘強度也較高。而將奈米黏土添加入水泥砂漿中批覆於熱傳導試體之加熱面會有效的阻絕高溫。
接著，以燒失法試驗了解再生混凝土中添加奈米黏土及高爐石粉之燒失量、水化程度、並以SEM輔助了解再生混凝土中添加奈米黏土及高爐石粉之微觀結構。

關鍵字

再生混凝土 ； 熱傳導 ； 奈米黏土 ； 阻絕高溫 ； 燒失量

並列摘要

In order to improve the properties of recycled concrete, a study is carried out by mixing nanoclay and slag powder with other recycled aggregates to produce recycled concrete. Strength of the recycled concrete is tested in order to study the effect of the nanoclay and slag powder. Also the effect of high temperature on recycled concrete and their thermal-conductivity are studied. Finally, nanoclay is added to the cement mortar which is then used to cover in the heating surface of the test-specimen. Effectiveness on fire-resistant of this nanoclay cement mortar is tested, and economic worth of the nanoclay to optimize.
From experiment results of this research, it is found that the compression strength of the recycled concrete is effective improved by adding nanoclay and slag powder. Slag powder has even better effects against nanoclay when the recycled concrete is subjected to high temperature; with an obvious higher residual strength. Heat is effectively blocked and temperature is dropped when the heating surface of the specimen is covered with cement mortar that contains nanoclay.
Finally, loss of ignition of the recycled concrete with nanoclay and slag powder is measured in order to understand the ignition loss due to fire-damaged and the hydration degree. Micro structure of the recycled concrete and nanoclay are studied with SEM.

並列關鍵字

nanoclay ； high temperature. ； Recycled concrete

參考文獻

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