- 學位論文
咖啡渣在混凝土材料再利用之可行性研究
The Research of the Feasibility on Recycling Coffee Residue Mixed with Concrete
摘要
目前國內工程建設之主體結構大都仍採用混凝土材料，但我國近年面臨砂石枯竭之困擾；工程用的砂石需求已供不應求，且超過河川砂石的自然補充量。而隨著世界各國環保意識的提高及資源正逐步被消耗殆盡，使得資源再利用的議題逐漸受到重視，所以若能尋求有效的替代料源將可適度紓解此問題之影響。因此本研究思考將一般視為廢棄物的咖啡渣（Coffee Residue），應用於混凝土材料上，並觀察其工作性（Workability）、抗壓強度（Compressive Strength）、凝結時間（Setting Time）、水化放熱（Hydration Heat Transfer）及光學顯微鏡觀測（Optical Microscope）等之巨觀及微觀變化情形，以找出最佳之添加量，進而探討其可行性。 經過本研究所進行之一系列試驗與量測過程，並經分析探討顯示以5%及10%咖啡渣灰之兩種添加比例方式較具可行性。另經過多次試驗發現添加15%及20%咖啡渣及咖啡渣添加油酸鈉界面劑之砂漿試體無法凝結；且隨著添加比例的增加，工作性及流度值均會相對降低，且砂漿試體內部之孔隙亦會增多且孔洞變大。此外，由抗壓強度試驗結果亦顯示，由相同齡期試體比較得知，其添加比例增高時，經本研究探討係因其吸水量會相對增高，故會使得抗壓強度越低；而由同一比例之試體比較可知，齡期越長則抗壓強度越高；其次由咖啡渣及咖啡渣添加油酸鈉界面劑砂漿試體之抗壓試驗結果可以得知，不論以同齡期比較或同比例比較，其抗壓強度均無太大差異。
並列摘要
In nowadays, most of the constructions in Taiwan use the concrete as material. However, in recent year, we have to face the lacing of the concrete. The supply of concrete that using in construction cant meet the need. In addition, the supply is far more the natural amount of the concrete of the lake. With the rising of environmental awareness and the consuming of the natural resources, the issue of energy reuse has been gradually emphasized by the public. Therefore, if we can find the alternative energy, we may be able to relieve the effect that brought by the problem. In the research, we apply the Coffee Residue that usually is being regarded as the trash into the material of concrete. Meanwhile, we observe the workability, compressive strength, setting time, hydration heat transfer. Also, we use the optical microscope to observe the major and minor difference to find out the best amount that should be added into it. By doing so, we can discuss the feasibility. Through the measurement and experiment by the research, we find out to add 5% and 10% of coffee residue into the concrete is more feasible than others. Additionally, after several experiment, we found out the gravel sand that has being added 15% and 20% is unable to congeal. With the adding of the percentage, the workability and the flow test will decrease comparatively and the crack inside the gravel sand will not only increase but also the hole will become bigger. In addition, the result of the compressive strength also shows that when the percentage of coffee residue adding increased, the amount of absorbing will also rise comparatively. This will decrease the compressive strength. By an example of identical percentage, we know that the longer we put the higher the compressive strength. We can also know from two examples of an experiment of compressive strength that respectively add the coffee residue and the coffee residue with the oleic acid, the compressive strength does not have big differences, no matter comparing with duration and the percentage.