Mechanical Behavior of a Pulverized Fly Ash Grouted Sand
Markou IN, Atmatzidis DK
(Received 27 March 2001; 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 mm, D₅₀ = 6 mm, and D₈₅ = 20 mm 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:
grouted sand, injection grouting, laboratory investigation, permeability, pulverized fly ash, sand, shear strength, suspensions, triaxial compression

Paper ID: GTJ10426

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Author Markou IN, Atmatzidis DK Title Mechanical Behavior of a Pulverized Fly Ash Grouted Sand Symposium , Committee on