| Article Details : |
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| | | Article Name : | | | The role of gypsum addition to the soil on the
relation of wet bulk density with shearing strength
and penetration resistance | | Author Name : | | | HUSAMULDEEN A. TAWFEEQ1, MUSTAFA Z. ABD ALHAMEED, ABDULWAHAB A.R. AL-KAYSSI | | Publisher : | | | Bridge Center | | Article URL : |  | | | Abstract : | | | A laboratory experiment was conducted to test the role of
gypsum addition rates on the relation between soil wet bulk density
with shearing strength and penetration resistance. Soil samples with
S0(0), S1(100), S2(200), S3(300), S4(400) and S5(500) g gypsum kg-1 soil
were prepared by mixing materials from surface soil (non gypsifesous)
layer with pure with different gypsum content were samples were
wetted at 50% of field capacity water contents 11.69 , 10.86, 10.39, 8.44
and 8.20% for soil samples S0, S1, S2, S3, S4 and S5 respectively. Soil
samples were incubated for 60 days in plastic bags with continual
daily mixing. After the incubation period, Soil samples were air dried,
grinded and sieved through 2mm sieve. Soil sample were packed into a
standard rings to a bulk density of 1.25 Mg m-3. Wet. Shear strength
and soil penetration resistance were determined at o, 33, 100, 300, 500
and 1000 kpa. Results shows that both soil shear strength and
penetration resistance were increased with increasing soil moisture
tension. On the other hand wet soil bulk density was decreased by
increasing moisture tension. | | Keywords : | | | Gypsum content, Shear strength, penetration resistance |
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