Compositions of Backfill Made of Fine and Very Fine Natural Sand
T. I. Rubashkina, M. A. Kostina
Belgorod National University, Belgorod, 308015 Russia
Keywords: Cemented paste backfill, very fine natural sand, aggregate grade analysis, sifted granular slag, ultrasonic investigation, ultimate compression strength, elasticity modulus, Poisson's ratio
Abstract
The strength, elasticity and deformability testing of cemented paste backfill is carried out. The test backfill compositions include fine and very fine natural sand with the increased content of clay and dust, and refined with sifted granular blast-furnace slag 0-5 mm in size. The uniaxial compression strength, elasticity modulus and Poisson’s ratio are determined in the test backfill compositions at different stages of curing. The ultimate uniaxial compression strength is correlated with the P-wave velocity and elasticity modulus determined in the static and dynamic tests of the backfill compositions.
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