Effect of Cement Type on the Mechanical Behavior of a Gravely Sand |
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| Authors: | S M Haeri A Hamidi S M Hosseini E Asghari D G Toll |
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| Institution: | (1) Department of Civil Engineering, Sharif University of Technology, P.O.Box 11365-9313, Tehran, Iran;(2) Group of Engineering Geology, Tabriz University, Tabriz, Iran;(3) School of Engineering, University of Durham, Durham, UK |
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| Abstract: | The behavior of a cemented gravely sand was studied using triaxial compression tests. Gypsum, Portland cement and lime were
used as the cementing agents in sample preparation. The samples with different cement types were compared in equal cement
contents. Three cement contents of 1.5%, 3.0% and 4.5% were selected for sample preparation. Drained and undrained triaxial
compression tests were conducted in a range of confining pressures from 25 kPa to 500 kPa. Failure modes, shear strength,
stress–strain behavior, volume and pore pressure changes were considered. The gypsum cement induced the highest brittleness
in soil among three cement types while the Portland cement was found to be the most ductile cementing agent. In lower cement
contents and lower confining pressures the soil cemented with Portland cement showed the highest shear strength. However,
in the same range of cement content, the soil cemented with gypsum showed highest shear strength for highest tested confining
stress. For higher cement contents the shear strength of soil cemented with Portland cement is higher than that for the two
other cement types for the range of confining pressures tested in the present study. The samples cemented with lime had the
least peak and ultimate shear strength and the highest pore pressure generation in undrained tests. Contrary to the soil cemented
with lime, the brittleness of soil cemented with gypsum and Portland cement reduces in undrained condition. Finally it was
found that the effect of cement type on the shear strength of cemented soils is more profound in drained condition compared
to undrained state. |
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| Keywords: | brittleness cementation cement type dilation gravely sand gypsum lime pore pressure portland cement |
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