本研究係探討高溫後砂漿之工程性質，試驗變數為在200℃、400℃、600℃、800℃高溫下分別加熱30分鐘、60分鐘、120分鐘，試驗結果顯示，砂漿之抗壓強度、動彈性模數、動剪力模數、重量損失、超音波、燒失量、吸水率性質會隨著溫度的增加及延時的增加而降低，將試驗結果進行二因子變異分析。再生混凝土工程性質方面，將紅磚碎塊、瓷磚碎塊、砂漿碎塊用體積取代方式，取代一般高性能混凝土中粗粒料體積，製成再生混凝土，各種粒料取代比例為0%、10%、20%，試驗結果顯示，粒料取代比例越高則混凝土性質越差，其中抗壓強度及表面電阻損失量最大，僅分別可達到控制組混凝土之73.5%及52.8%，動彈性模數、動剪力模數、超音波速則分別為81.63%、84.33%、90.93%，最後將試驗結果進行三因子變異數分析、回歸分析，影響權重分析。

This research studies the properties of Portland cement mortar after high temperature. The variables include five temperatures of 100℃, 200℃, 400℃, 600℃,800℃ and three time durations of 30 mins, 60 mins, 120 mins. The influence of each variable on the property of cement mortar was studied. The engineering properties include compressive strength, ultrasonic pulse velocity, dynamic modulus of elasticity, dynamic shear modulus , weight loss rate, LOI and absorption rate. Experimental results show that the properties decrease at higher temperatures or longer time durations. Statistical analysis of on two-factor ANOVA (Analysis of Variance) the experimental results were also carried out.
For the engineering properties of recycled concrete, the brick gravel, tile gravel and mortar gravel were used to replace the coarse aggregate in high performance concrete by volume to make the recycled concrete. There placement ratios are 0%, 10% and 20%, respectively. Experimental results show that the more the amount of recycled aggregate replacement, the lower the corresponding engineering properties of concrete will be. The maximum reductions occer in compressive strength and surface electrical resistance, in which they only reach 73.5% and 52.8%, respectively, of those for control normal concrete specimens. Besides, the ultrasonic pulse velocity, dynamic modulus of elasticity and dynamic shear modulus decrease to about 81.63%, 84.33% and 90.93% of those of control normal concrete. Finally, the statistical analyses on the experimental results, including three-factor ANOVA, multiple regression analysis and influence right analysis were also carried out.

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