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Use of Stone Powder Sludge in Fly Ash-Based Geopolymer
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  • Journal title : Architectural research
  • Volume 12, Issue 1,  2010, pp.49-55
  • Publisher : Architectural Institute of Korea
  • DOI : 10.5659/AIKAR.2010.12.1.49
 Title & Authors
Use of Stone Powder Sludge in Fly Ash-Based Geopolymer
Choi, Se-Jin;
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Stone powder sludge is a by-product of the manufacturing process of crushed sand. Most of it is dumped with soil in landfills, and the disposal of stone powder sludge causes a major environmental problem. This paper investigates the applicability of stone powder sludge in fly ashbased geopolymer. For this, stone powder sludge was used to replace fly ash at a replacement ratio of 50% and 100% by weight. The compressive strength of the samples was measured and scanning electron microscopy/ energy dispersive spectroscopy (SEM/EDS) analysis and X-ray diffraction (XRD) were performed. The test results indicated that the optimum level of the alkali activator ratio (/NaOH) for fly ash-based geopolymer using stone powder sludge was 1.5. The strength development is closely related to the NaOH solution concentration. In addition, the compressive strength of the sample cured at was significantly improved between 7 days and 28 days, even though the strength of the sample showed the lowest value at 7 days. Microscopy results indicated that a higher proportion of unreacted fly ash spheres remained in the sample with 5M NaOH, and some pores on the surface of the sample were observed.
Stone Powder Sludge;Fly Ash;Geopolymer;Alkali Activator;Compressive Strength;
 Cited by
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