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Effect of fly ash and polypropylene fibres content on the soft soils

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Abstract

Fly ash is a waste produced from the burning of coal in thermal power stations. The staggering increase in the production of fly ash and its disposal in an environmentally friendly manner is increasingly becoming a matter of global concern. Efforts are underway to improve the use of fly ash in several ways, with the geotechnical utilization also forming an important aspect of these efforts. An experimental program was undertaken to investigate the effects of multifilament and fibrillated polypropylene fibre on the compaction and strength behavior of CH class soil with fly ash in different proportions. The soil samples were prepared at two different percentages of fibre content (i.e. 0.5 and 1% by weight of soil) and two different percentages of fly ash (i.e. 10 and 15% by weight of soil). A series of tests were prepared including optimum moisture content and laboratory unconfined compression strength tests, compaction tests and Atterberg limits test. The fibre inclusions increased the strength of the fly ash specimens and changed their brittle behavior into ductile behavior.

Résumé

Les cendres volantes constituent un déchet issu de la combustion du charbon dans les centrales thermiques. L’augmentation vertigineuse de la production de cendres volantes et sa mise en dépôt dans des conditions respectueuses de l’environnement sont de plus en plus des sujets de préoccupation générale. Des efforts sont en cours pour améliorer l’utilisation des cendres volantes de plusieurs façons, l’utilisation de ces produits en géotechnique représentant un aspect important de ces efforts. Un programme expérimental a été entrepris pour étudier les effets, sur les caractéristiques de compactabilité et de résistance, de l’incorporation de fibres de polypropylène multi filament (M19) et fibrillated (E19) à des sols de classe CH comportant différentes proportions de cendres volantes. Les échantillons de sol ont été préparés avec deux teneurs différentes en fibres (i. e. 0,5 et 1% en poids de sol) et deux teneurs différentes en cendres volantes (i. e. 10 et 15% en poids de sol). Une série d’échantillons ont été préparés à la teneur eau optimum et des essais de compression simple et de compactage ainsi que des mesures de limites d’Atterberg ont été réalisés. L’incorporation de fibres a augmenté la résistance des échantillons contenant des cendres volantes et modifié leur comportement fragile en un comportement ductile.

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Acknowledgments

The authors would like to thank Polyfibres Industry in Istanbul for supplying polypropylene fibres.

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  1. Civil Engineering Department, Cumhuriyet University, Sivas, Turkey

    Ahmet Şenol

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  1. Ahmet Şenol
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Correspondence to Ahmet Şenol.

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Şenol, A. Effect of fly ash and polypropylene fibres content on the soft soils. Bull Eng Geol Environ 71, 379–387 (2012). https://doi.org/10.1007/s10064-011-0391-6

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  • DOI: https://doi.org/10.1007/s10064-011-0391-6

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