ISSN: 0149-6115
Published Online: 17 November 2003
Page Count: 11

Mechanical Behavior of a Pulverized Fly Ash Grouted Sand

Markou, IN
Lecturer,Democritus University of Thrace, School of Engineering,

Atmatzidis, DK
Professor,University of Patras, School of Engineering,

(Received 27 March 2002; accepted 31 October 2002)

Abstract

A laboratory investigation was conducted in order to develop a new grout based on pulverized fly ash. Pulverization of a selected Greek fly ash yielded a gradation with D¹⁵ = 1.3 µm, D⁵⁰ = 6 µm, and D⁸⁵ = 20 µm and Blaine specific surface approximately equal to 8300 cm²/g. Suspensions of this pulverized fly ash, improved with additives, have comparable properties to ordinary and microfine cement suspensions. Suspensions were injected into clean sands. Permeability, UU, and CU-PP triaxial compression tests were conducted on the grouted specimens. The coefficient of permeability of the sands is reduced by 4 to 7 orders of magnitude. Grouting increases the stiffness and reduces the deformability of the sands. The Mohr-Coulomb failure criterion represents adequately the behavior of the grouted sands, yielding cohesion values ranging from 290 to 450 kPa and angle of internal friction values up to 5° higher than those of the clean sands. The shear strength parameters vary with axial strain, attaining their final values well before failure.

Keywords:
injection grouting, suspensions, pulverized fly ash, grouted sand, laboratory investigation, permeability, triaxial compression, shear strength

Paper ID: GTJ11252J
DOI: 10.1520/GTJ11252J
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