Abstract
Alkali and carbonate-enriched lime mud (LM) is a solid waste produced during alkali recovery in the paper-making industry. In the present work, high-volume LM was upcycled in fly ash and silica fume-blended Portland cement (FSPC), and its positive roles were investigated through hydration kinetics analysis, X-ray diffraction, thermogravimetric analysis, and scanning electron microscopy. Experimental results indicated that calcium carbonate in LM provided additional nucleation sites for the precipitation of cement hydration products and contributed to the increment of compressive strength. On the other hand, the alkali in LM facilitated the secondary or further hydration of mineral admixtures.
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