MindTap Engineering, 1 term (6 months) Printed Access Card for Das/Sivakugan’s Principles of Foundation Engineering, 9th
9th Edition
ISBN: 9781337705202
Author: Das, Braja M., SIVAKUGAN, Nagaratnam
Publisher: Cengage Learning
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Chapter 5, Problem 5.3P
To determine
Find the difference in the values of
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The following are results of a field unit weight determination test using sand cone method:
Volume of hole = 0.0019 m3
Mass of moist soil from hole = 3.48 kg
Water content = 12.43%
Max. dry unit weight from a laboratory compaction test = 19.56 kN/m3
Determine the relative compaction, in percent.
Hint: Relative compaction = Field dry unit weight / Max dry unit weight (lab)
the modified compaction method for the same soil sample gives
10 points
. .moisture value than the standard compaction method and ..2.
max. dry density value
1 (lower) 2(lower)
O 1 (lower) 2(greater)
O 1(greater) 2(lower)
O 1(greater) 2(greater)
(ex
A subgrade soil sample was tested using standard
CBR apparatus and the observations are given
below.
Load (kg)
60.5
Penetration (mm)
2.5
80.5
Assuming that the load-penetration curve is convex
throughout, the CBR value (%) of the sample is
5.0
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MindTap Engineering, 1 term (6 months) Printed Access Card for Das/Sivakugan’s Principles of Foundation Engineering, 9th
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- The following data has been obtained from a standard Proctor test conducted on a silty clay soil. The maximum dry unit weight = 17.5 kN/m³; Optimum water content = 12.5% The construction specifications require a relative compaction of 95% and field compaction water content to be within ±2% if the optimum. A sand cone test was performed to measure the dry unit weight and water content achieved during the field compaction operation. The volume of the test hole has been already been calculated from the sand cone data Volume of test hole = 1.5x10-3 m³. Total weight of moist soil removed from hole = 2.73 kg %3D Weight of soil removed from hole after drying = 2.46 kg Use conversion 1.0kg = 0.01 KN Determine the following: %3D a. Field water content (%) = Report to ONE decimal (Show work in hand-calc sheet) b. Has the compaction specifications met with respect to compaction water content? Say YES or NO c. Field dry unit weight (kN/m3) = Report to ONE decimal (Show work in hand-calc sheet) d.…arrow_forward2. Sand cone equipment is used to perform a field density test on a compacted earth fill. Sand is used in the cone and is known to have a bulk density of 15.74 kN/m3 . Soil sample dug from test hole, (wet weight) = 20.601 N Dry weight of soil sample = 17.926 N Weight of sand (sand cone) to fill test hole = 16.503 N Determine the in-place dry density of the tested soil (Ans: 17.57 kN/m3) Determine the water content (Ans: 15%) Compute the percentage of compaction of the tested soil if the laboratory moisture-density curve indicates a dry density of 18.10 kN/m3 and an optimum moisture content of 13%. (Ans: 97.07%)arrow_forwardFollowing are the results of a field unit weight determination test on a soil using the Sand Cone Method. Determine the field unit weight of the soil. FEEDBACK GUARANTEEDarrow_forward
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