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Consolidation of Silica Sand Slime with a Geopolymer Binder at Room Temperature and the Strength of the Monoliths

K. Ikeda, T. Nunohiro, and N. Ilzuka

Department of Advanced Materials Science and Engineering, Yamaguchi University, Ube 755, Japan

 

Abstract: Consolidation of silica sand slime. a waste from silica sand mines, was attempted by the geopolymer technique. Fly ash and blast furnace slag were introduced as secondary raw materials. Sodium silicate having chemical composition of Na2O . 2SiO2 was used as a source of the geopolymer binder by diluting with mater. The amount of the blast furnace slag acting as an accelerating agent of solidification was kept constant at the level of 10 % of the solid. Mixing the slime and the fly ash in variable ratio with the slag under the constant liquor-solid mass ratio, 0.60; geopolymer monoliths were prepared by slurry casting. All the process was performed at room temperature including the subsequent treatments. Demolded at 1 d age, solidified monoliths were kept drying in air for 28 d and then, cut into prisms having 1 cm x 1 cm cross-section and soaked in water for 3 d (wet bodies). Some test-pieces were further continued to dry in air for 7 d after the soaking (dry bodies). Strength tests showed maxima in 60 % blend of fly ash, indicating 4.6 MPa flexural and 13.4 MPa compressive strengths for the wet bodies and 8.3 MPa and 21.7 MPa for the dry bodies. Cement chemistry notation: –° - CaO, S - SiO2, H - H2O.

Full paper in Portable Document Format: 524a214.pdf

 

Chemical Papers 52 (4) 214–217 (1998)

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