| 摘要: | 本研究主要在找尋製作改質人工粒料的最適當配比，再將其取代天然粒料製作混凝土及砂漿試體，以探討改質人工粒料資源化運用的策略。研究內容依執行程序可區分為三個實驗階段；決定改質人工粒料的最佳固化配比、拌和用各材料間性質分析、砂漿及混凝土製作。研究成果顯示: (1)當w/c = 0.44、黏結料濕餅重量比 = 1.1、爐石取代50 %水泥進行水洗礦尾渣固化處理，能有最佳強度表現。(2)改質人工粒料的氯離子含量已遠低於規範值，並具備比重小、吸水率高等特性，但耐久性不及天然粒料，採部分取代天然粒料方式用於砂漿及混凝土時，對試體的性質影響較小。(3)花蓮砂相較於其他產地之天然粒料，除ASR活性低外，其比重、吸水率、抗磨損及用於製作砂漿強度方面均有最佳表現。(4)若要改善因使用改質人工粒料所降低的工作性，使用改質木質磺酸作為強塑劑，會有最佳的提升工作性及強度的效果，較有成效的添加量約為黏結粉體量之0.68%。(5)砂漿試驗中，改質人工粒料取代天然粒料比例愈高，則砂漿性質會愈差。使用2.3~2.7較低細度模數的改質人工粒料時，對砂漿工作性及強度較有利。(6)改質人工粒料經機器破碎而得，顆粒較不規則，因此混凝土的工作性會隨著其粒徑增加而降低，強度亦隨著且取代量越多折減量越大。當取代粗砂、細砂及一分石時水灰比分別選用0.7~0.8範圍其28天強度皆可達210 kgf/cm2。This research devoted in looking to the most appropriate proportion ofmaking modified artificial aggregates, to investigate the suit resource usage strategies in concrete and mortar specimens. According to research content enforcement procedures can be divided into three experimental phase; decided the best solidify proportion of the modified artificial aggregates, Mixing using analysis various materials between the nature and mortar and concrete production.The results show : (1) when being mixed with the proportion of 0.44 w/c, 1.1 cement/cake and 50% slag for cake solidify has the best strength performance. (2) The chloride ion content of the modified artificial aggregates have been lower than specification, and has low specific gravity, high water absorption properties but the durability is less than the natural aggregates, appropriate use of mortar and concrete have less affected on the properties of the specimen. (3) The Hualien sand compared to the other origin of natural aggregates, have the best performance both in terms of activity, basic properties and strength of mortar. (4) Using MLS as a superplasticizer, which can effectively improve the workability and strength decreased as a result of using the modified artificial aggregates. (5) In the mortar test, while modified artificial aggregates replace the higher the percentage, the mortar performance will be worse , but use lower fineness modulus(2.3~2.7), mortar workability and strength have better advantageous. (6) Due to modified Artificial aggregates to show irregular-shaped particles, in concrete test, when particle size and replaced amount increased ,will reduce workability and strength. When to replace the coarse sand, fine sand and Coarse aggregates then order of selection 0.8,0.7 and 0.7 w/c ,the strength of the 28 days could reach 210 kgf/cm2. |
