石灰石煅燒黏土複合膠結材(LC3, Limestone Calcined Clay Cement)為高嶺土、石灰石與水泥熟料之三元水泥基膠結材。相對於卜特蘭水泥，LC3膠結材使用較少的水泥熟料，因此降低製程的能耗與排碳，然而國內對於其配比組成、膠結性能與耐久性質等甚少相關研究，有待進一步探討。有鑑於此，本研究探討LC3的配比組成與其抗壓強度、抗碳化能力的關係。試驗變數包括高嶺土的煅燒溫度與時間、熟料來源、高嶺土來源、水灰比、養護方式及粒料比例。過程中，分別以體積及重量比配製煅燒高嶺土：石灰石=1:0、0:1、1:2、3:2、2:1之混合粉末，再與熟料以1:1、1:2、1:3與1:4混合製造出LC3。試驗結果發現，高嶺土的最佳煅燒溫度為550 °C、最佳煅燒時間為4小時、不同來源的熟料與高嶺土並未明顯影響其抗壓強度、於水灰比為0.5可得最高抗壓強度、砂漿中粒料比例越高，則強度越低，採用飽和石灰水養護可獲得較高的強度，使用LC3則增加碳化深度。

The limestone calcined clay cement (LC3) is a tenary cementitious material containing kaolinite, limestone, and cement clinker. In contrast to Portland cement, the LC3 uses less cement clinkers, thereby reducing the energy required during the manufacturing process and the release of the carbon dioxide. Howerver, there is few domestic researches on its compositions, cementitious properties and durability. In view of this issue, this study explores the relationship among its compositions and the compressive strength and the carbonation resistance. The experimental parameters include the calcining temperature of the kaolinite, calcining time, source of the cement clinker, source of the kaolinite, water-to-cement ratio, curing method, and the aggregate ratio. During the study, the LC3 was produced by preparing and calcining the mixing powder at volume or weight ratios (w/c) of kaolinite:limestone=1:0、0:1、1:2、3:2、2:1 and mixing of the calcined power and the cement clinker at 1:1, 1:2, 1:3, and 1:4. Results showed that the optimum calcing temperature and time of the kaolinite was 550 °C and 4 hours, respectively. The cement clinkers and the kaolinite from different sources did not greatly change the compressive strength. The highest compressive strength was obtained in the specimens with w/c of 0.5. The strength was reduced by the aggregate ratios. A higher strength was obtained through the saturated lime water curing. The specimens with the LC3 had higher carbonation depth than those with Portland cement.

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