| 摘要: | 本研究的目的是評估改質人工粒料應用於低階混凝土之方法與可行的巿場定位策略。在執行作法上可分為三個實驗階段；製備改質人工粒料、材料性質分析、改質人工粒料混凝土拌合。
研究成果顯示: (1) 改質人工粒料合適的造粒水固比為 0.27 ~ 0.33範圍，其成型方式需壓力及振動同時施加較為有效。 (2)改質人工粒料比重較天然粒料輕，吸水率及磨損率較大，但其健度、含砂當量以及粒料受水合作用之潛在膨脹等性質皆符合相關規章之規定值。(3) 當改質人工粒料取代天然粒料時，初始的工作性均可符合需求，而當爐石粉取代40%水泥後之 30 分鐘坍度損失情形並無法予以改善。雖然對混凝土膨脹量未予改善也未能增加抗壓強度，但可有效降低乾縮量。(4)改質人工細粒料混凝土之30 分鐘坍度損失，較廢混凝土塊機制砂混凝土少，且乾縮率較廢混凝土塊機制砂混凝土低，而在抗壓強度上，兩者並無顯著差異。(5)無論是否加入爐石粉及飛灰，水膠比為0.66、0.70 及0.90，改質人工細粒料取代50%及100%，其抗壓強度能符合本研究探討之強度介於 80 – 210 kgf / cm2 之目標。;The purpose of this study was to evaluate the method of the modified artificial aggregates (MAA) used in low-level concrete and the practical market positioning strategy. The practice of this research can be divided into three experimental stages: preparation of modified artificial aggregates, analysis of material properties, and the mix of modified artificial aggregate concrete.
The results show that: (1) The suitable w/s ratio of granulating for manufacturing modified artificial aggregates is 0.27 to 0.33, the molding method of MAA is more effective by pressuring and vibrating at the same time. (2) The properties of MAA compared to that of the natural aggregates with lighter specific gravity, higher water absorption and abrasion rate, however, the soundness, the sand equivalent value and the potential expansion of aggregates from hydration reactions are in compliance with the regulations. (3) When the MAA to replace natural aggregates, the initial workability can meet the demand, however, for specimen using slag replaces 40% cement by weight, the slump loss condition of 30 minutes is not improved. The amount of concrete expansion has not been improved and the compressive strength has not been increased, but the amount of dry shrinkage can be reduced effectively. (4) The slump loss of 30 minutes for the MAA concrete is less than that of concrete using the manufactured sand of waste concrete blocks, and has the lower value of the shrinkage rate, but for the compressive strength, there is no significant difference between the two. (5) Whether adding slag or fly ash, w/b ratio of 0.66,0.70 and 0.90, MAA replace natural fine aggregates of 50% and 100%, the compressive strength of specimens all can meet the target strength of 80 - 210 kgf/cm2. |
