本研究以不同造粒的方式，改善傳統流動性煤灰混合材在水中析離現象，增加回填材料強度的均勻性，提高灰塘煤灰去化之目標。試驗土樣採用林口電廠二期灰塘之煤灰，依排灰管之距離遠近，分三區取樣，進行室內試驗。由篩分析試驗結果得知，林口灰塘煤灰的細粒料含量不多，需依一定的重量比例，添加少量的飛灰，增進其膠結性，以利後續試驗的進行。透過林口灰塘煤灰與飛灰混合材，評估造粒和作為港灣工程回填料之可行性。試驗變數包括:養護齡期與養護方式。可行性試驗項目包括室內水力回填試驗、單壓強度試驗、修正夯實試驗、加州載重比試驗(CBR)、單向度壓密試驗與直接剪力試驗。
試驗結果發現，煤灰破碎材與煤灰造粒材中，細粒料含量明顯降低，且確實可改善材料析離的現象，並提高整體的均勻性。至於，不同養護方式或養護齡期，對造粒材的物理性質影響不大，但其力學性質，則會因不同養護方式或養護齡期而有所差異，但皆優於未經處理之煤灰材料和流動性煤灰混合材。因此，可藉由造粒的方式，改善煤灰做為回填料(水中回填和陸上回填)之工程性質，以提高煤灰去化率和資源再利用之效率。

Different granulated methods were studied in this research to reduce the particles segregation problem of hydraulically dumped coal ash mixture in the water. So, the strength uniformity of backfilled coal ash can be enhanced. The coal ash used in the laboratory test was taken from the ash pond of Linkou Power Plant at different distances from the outlet of ash pipes discharging pipeline. Since the Linkou coal ash mainly consists of coarse particles, a small amount of fine fly ash was added to the coal ash mixture to improve its cohesive property and to facilitate the laboratory experiments. To evaluate the feasibility of making particulate backfill material from Linkou coal ash and fly ash, the following parameters testes were adopted: curing method and curing time, unconfined compressive strength, California Bearing Ratio (CBR), modified Proctor test, consolidation test and direct shear test. The particles segregation was also observed from a model hydraulic filling test.

The test results show that the fines content in the coal ash mixture is significantly reduced after granulation. So does the particles segregation during hydraulic backfilling. After the cemented coal ash hardened, it was broken into smaller pieces by hammer; or the coal ash mixture was pushed through a sausage maker and produced small hot-dog like cemented coal ash backfilled material. The laboratory test results show that the physical properties of cemented coal ash are not affected by different curing methods or curing time; but the mechanical properties will vary depend on the curing methods and curing time. Finally, the benefit of the granulated coal ash mixture will be compared with coal ash or coal ash mixture in terms of performance. It is hoped that coal ash removal and recycling process can be significantly improved by means of the coal ash granulation method proposed in this study.

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