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Development of a pulverized fly ash suspension grout

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Abstract

A Greek lignite fly ash was selected because of its hydraulic properties and was pulverized to produce a specific surface of 8300 cm2/g, and a gradation with D15, D50, and D85 equal to 1.3 μm, 6 μm and 20 μm, respectively. The pulverized fly ash suspension properties were optimized by adding a suitable superplasticizer and a suitable accelerator at optimum dosages. The experimental evaluation of suspension properties included sedimentation tests, viscosity'measurements, rheological properties, setting times and development of strength with time. Groutability and effectiveness were evaluated by injecting selected suspensions into clean sands. Pulverization improves remarkably the behavior of fly ash suspensions. Suspensions with water to solids ratios of 1.5:1 and 2:1 by weight and containing additives, behave as Bingham fluids, have apparent viscosity lower than 70 cP, bleed capacity lower than 5%, initial setting time lower than 24 h, and can be injected into relatively coarse sands. These characteristics are comparable to those obtained for ordinary and microfine cement suspensions, showing that pulverized fly ash suspensions can be used for permeation grouting.

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Authors and Affiliations

  1. Department of Civil Engineering, Democritus University of Thrace, Xanthi, Greece

    I. N. Markou

  2. Department of Civil Engineering, University of Patras, Patras, Greece

    D. K. Atmatzidis

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  1. I. N. Markou
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  2. D. K. Atmatzidis
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Markou, I.N., Atmatzidis, D.K. Development of a pulverized fly ash suspension grout. Geotechnical and Geological Engineering 20, 123–147 (2002). https://doi.org/10.1023/A:1015071621943

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