磚類再生粒料混凝土高溫受熱後對抗壓強度與超音波速之影響

Effect of Elevated Temperature on Strength and Ultrasonic Pulse Velocity of Recycled Concrete using Brick Aggregates

翟慰宗(Wei-Tsung Tsai)

指導教授 ： 何仲明

中原大學/工學院/土木工程研究所/博士(2011年)

https://doi.org/10.6840/CYCU.2011.00258

摘要

本文以廢棄紅磚、磁磚製成再生細粗、細粒料及粉料以不同比例取代天然粒料及水泥，拌製混凝土、水泥砂漿，探討再生料使用對混凝土、水泥砂漿之抗壓強度相對強度比、齡期28至91天之抗壓強度成長、高溫受熱後之抗壓強度降低百分比與由室溫加熱至不同高溫後抗壓強度變化、超音波速折減變化等之影響；以簡單非線性迴歸法建立高溫受熱後再生混凝土抗壓強度與溫度之迴歸曲線經驗式、高溫受熱後之抗壓強度折減率與溫度之迴歸曲線經驗式，並由抗壓強度及超音波速試驗值建立不同再生粒料取代比例混凝土抗壓強度與超音波速迴歸曲線、不同水灰比再生混凝土抗壓強度與超音波速迴歸曲線、不同高溫受熱後再生混凝土抗壓強度與超音波速迴歸曲線。
由試驗結果顯示再生紅磚、再生磁磚粗、細粒料混凝土、再生粉料水泥砂漿晚期之抗壓強度成長均較天然混凝土、天然水泥砂漿佳，再生紅磚、磁磚粗、細粒料使用對混凝土高溫受熱後抗壓強度影響不明顯。
由試驗結果顯示紅磚粗、細粒料再生混凝土高溫作用後超音波速折減量、百分比較天然混凝土高。再生磁磚粗粒料混凝土高溫受熱後超音波速較天然混凝土試驗值高，再生磁磚細粒料之使用對混凝土高溫受熱後超音波速折減影響則不明顯。
由迴歸分析顯示，相同紅磚再生粗粒料取代比例之混凝土抗壓強度與超音波速具高度相關性。不同水灰比之紅磚再生粒料混凝土抗壓強度與超音波速迴歸曲線因粗、細粒料含量不同，抗壓強度與超音波速相關性不高。高溫作後再生紅磚粗、細粒料混凝土抗壓強度與超音波速具高度相關性。另相同磁磚再生粗、細粒料取代比例混凝土抗壓強度與超音波速俱高度相關性，不同取代比例對再生混凝土抗壓強度與超音波速相關性影響性小，高溫作後磁磚再生粗、細粒料混凝土抗壓強度與超音波速具高度相關性。

關鍵字

抗壓強度 ； 超音波速 ； 迴歸分析 ； 磁磚 ； 紅磚 ； 高溫受熱 ； 再生混凝土

並列摘要

The purpose of this paper is to investigate the effect on the properties of recycled concrete and mortar with various percentages of natural coarse, fine aggregates and cement replaced by crushed construction brick and tile aggregates. To find the relative compressive strength ratio, the increase in compressive strength between 28-91 days The percentage of decrease in residual strength and the change on compressive strength and ultrasonic pulse velocity (UPV) after subjected to elevated temperatures of recycled concrete and mortar are performed. A simple regression method used to establish the regression equation of compressive strength and temperature of recycled concrete.
Experiment results revealed that the development of long-term strength of recycled concrete and mortar is better than that of the natural concrete and mortar. The use of brick coarse and fine aggregate affects the compressive strength slightly.
Experiment results revealed that the reduction of UPV of recycled concrete with coarse and fine brick aggregate is higher than that of natural concrete. The UPV of recycled concrete with coarse tile aggregate is higher than that of natural concrete. The use of tile fine aggregate affects the UPV slightly.
Regression analysis results revealed that the compressive strength and UPV of recycled concrete with the same coarse brick aggregate replacement had a high relevance. The recycled concrete with various water to cement ratio had a low relevance due to the content of aggregate. The analysis results revealed that the residual strength and residual UPV of recycled concrete with the coarse or fine brick aggregate had a high relevance after elevated temperatures exposure. Experimental results revealed that the compressive strength and UPV of recycled concrete with the same coarse tile aggregate replacement had a high relevance. The replacement of tile affects the regression slightly. The residual strength and residual UPV of recycled concrete with the coarse or fine tile aggregate had a high relevance after elevated temperatures exposure.

並列關鍵字

tile ； recycled concrete ； high temperatures exposure ； compressive strength ； ultrasonic pulse velocity ； regression analysis ； brick

參考文獻

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