再生高性能混凝土受高溫後性質之研究

A Study on The Thermal Effects on High Performance Recycle Concrete

傅文忠(WEN-CHUNG FU)

指導教授 ： 何仲明

中原大學/工學院/土木工程學系/碩士(2008年)

https://doi.org/10.6840/cycu200900574

摘要

鑒於國內之廢棄物堆置日益困難及砂石供應短缺下，營建廢棄物之回收再利用已勢在必行，本文探討強塑劑添加量對再生混凝土之影響，試驗並改變水灰比及再生細骨材之取代量，並在不同的齡期下，比較其抗壓強度發展；並對不同高溫受熱延時後，再生混凝土殘餘抗壓強度比較，用以了解再生高性能混凝對高溫作用後之物理性質及力學性質。試驗結果顯示再生混凝土齡期28天抗壓強度下降31％，另再生骨材高取代量在使用再生混凝土中具可行性。

關鍵字

營建廢棄物 ； 強塑劑 ； 高性能混凝土

並列摘要

In recent years, because of rising consciousness on environmental protection and the lacking of construction waste dumping yards, recycling of construction wastes has been promoted extensively. The purpose of this study was to ascertain the effect on properties of the fresh and harden recycled concrete, at ambient and enhanced temperatures, by replacing coarse aggregate with construction wastes. This research mainly concentrates on high performance recycled concrete (HPRC); by adding different amount of superplasticizer into the HPRC and to test and compare its mechanical and thermal properties with general high performance concrete (HPC). Thereafter, tests are carried out determine its compressive strength, residual strength after high temperature and the loss on ignition of the HPRC mixed with different water-to-cement ratio and different replacement proportions of recycled aggregates. Finally, from all the test results, the best proportion of recycled coarse aggregates that can be replaced is determined. Similar tests, such as the slump test and slump flow test, are carried out both on the HPRC and HPC. When the water-to-cement ratio is 0.3 and the amount of superplasticizer added is 1.2%, HPRC has the best performance. The specimens with 100% recycled aggregates were 31% below the control concrete sample in compressive strength at age of 28 days. By the way of adding admixture, the recycled concrete could reach the demand strength of the HPC. The results show that it is feasible to allow a higher replacement percentage of construction wastes for producing concrete products.

並列關鍵字

Construction wastes ； high performance recycled concrete. ； superplasticizer

參考文獻

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