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Thermal and microstructural studies on mud with additives

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Abstract

Mixtures of mud with various additives were studied to explain the reasons for the change in geotechnical properties. The additives were: lime, cement, fly ash, water-glass containing either Na2CO3 or CaCl2 and phosphogypsum. An increase in strength was usually associated with increase of weight loss, both on static or dynamic heating. An exothermic peak occurred between 420°C and 490°C., being especially high in the presence of water -glass, together with CaCl2. XRD indicated an increase in calcite content and the possible formation of calcium aluminate silicate hydrate.

SEM showed a non-homogeneous microstructure and big pores in case of mixtures of low strength (water-glass addition). A homogeneous aggregated structure was obtained in the case of higher strength (fly ash, phosphogypsum).

Zusammenfassung

Gemische aus Schlamm mit verschiedenen Additiven wurden untersucht, um Änderungen in geotechnischen Eigenschaften zu erklären. Diese Additive waren: Kalk, Zement, Flugasche, Wasserglas mit entweder Na2CO3 oder CaCl2 und Phosphogips. Die Zunahme der Festigkeit war stets mit der Zunahme des Gewichtsverlustes verbunden, sowohl bei statischem als auch bei dynamischem Erhitzen. Zwischen 420°C und 490°C konnte ein exothermer Peak beobachtet werden, der in Gegenwart von Wasserglas mit CaCl2 besonders hoch war. Röntgendiffraktion weist auf ein Ansteigen des Calcitgehaltes und eine mögliche Bildung von Calciumaluminatsilikat-Hydrat hin.

SEM zeigte ein inhomogenes Mikrogefüge und große Poren im Falle von Gemischen geringerer Festigkeit (Zusatz von Wasserglas). Im Falle höherer Festigkeiten (Flugasche, Phosphogips) wurde eine homogenes aggregiertes Mikrogefüge erhalten.

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Authors and Affiliations

  1. Institute of Hydroengineering, Polish Academy of Sciences, 80953, Gdansk-Oliwa, Poland

    E. T. Stepkowska, Z. Sulek, J. L. Perez-Rodriguez, A. Justo & C. Maqueda

  2. Consejo Superior de Investigaciones Cientificas, Instituto de Ciencia de Materiales de Sevilla, Apartado 1115, 41080, Sevilla, Spain

    J. L. Perez-Rodriguez & A. Justo

  3. CSIC, Instituto de Recursos Naturales, Apartado 1052, 41080, Sevilla, Spain

    C. Maqueda

Authors
  1. E. T. Stepkowska
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  2. Z. Sulek
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  3. J. L. Perez-Rodriguez
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  4. A. Justo
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  5. C. Maqueda
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Dedicated to Prof. Dr. H. J. Seifert on the occasion of his 60th birthday

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Stepkowska, E.T., Sulek, Z., Perez-Rodriguez, J.L. et al. Thermal and microstructural studies on mud with additives. Journal of Thermal Analysis 37, 1497–1511 (1991). https://doi.org/10.1007/BF01913483

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  • DOI: https://doi.org/10.1007/BF01913483

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