廢棄花崗岩礦泥再利用於高性能混凝土之研究

A Study of Recycling Granite Mineral Sludge Waste for Making High Performance Concrete

本研究以花崗岩石材加工後之廢棄礦泥，利用緻密配比設計法設計3種水膠比 （W/B = 0.23、0.35及0.47） 之高性能混凝土 （high performance concrete,HPC），探討廢棄礦泥對混凝土工程性質之影響，以及與飛灰應用差異之比較。研究結果顯示，花崗岩礦泥化學成分與飛灰相似，但為結晶成分，材料特性與惰性材料較相近。廢棄礦泥高性能混凝土可製成流動化混凝土，具有較高的早期強度，W/B 為0.23 時，廢棄礦泥高性能混凝土91 天抗壓強度超過700kgf/cm2，超音波速達4,950 m/s，電滲量與飛灰高性能混凝土相近，達「低」滲透性混凝土標準；W/B 為0.35 及0.47 時，微觀結構鬆散，強度性質較飛灰高性能混凝土低，但由部分飛灰取代則可有效提升混凝土中、長期抗壓強度、緻密性與抗滲性。

rock is recycled for producing high performance concrete (HPC). The DensifiedMixture Designed Algorithm (DMDA) is applied to design HPC withdifferent water-to-binder ratios (W/B = 0.23, 0.35 and 0.47), and the effectof using MSW on the properties of HPC is investigated and compared withfly ash (FA) HPC. The results show the chemical composition of MSW issimilar to FA but it will act as inert material due to the crystal phase.MSWHPC can have a flowing character and the early age compressivestrength is slightly higher than FAHPC. As W/B = 0.23, the 91-day compressivestrength of MSWHPC is greater than 700 kgf/cm2 and its ultrasonicpulse velocity (UPV) is greater than 4,950 m/s. The chloridepenetration of MSWHPC is similar to FAHPC in the “Low” range. AsW/B = 0.35 and 0.47, the micro-structure of MSWHPC is loose and itsstrength is lower than that of FAHPC. However, the addition of FA to replace part of MSW can effectively improve the medium and long-termcompressive strength, density and permeability.