how do the following changes influence the CBR? Use v to judge what the best answer is. California Bearing Ratio, CBR Significant Significant Little Effect Increase Decrease Water content of a clean uniform gravel is decreased by 6% from the optimum value A"crushed limestone" is substituted for a "sandy gravel", both being at optimum moisture contents Fines (< No. 200) content of a "clean sand" is increased from 2% to 20% at the wet side of optimum

Structural Analysis
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Author:KASSIMALI, Aslam.
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Chapter2: Loads On Structures
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how do the following changes influence the CBR?
Use V to judge what the best answer is.
California Bearing Ratio, CBR
Significant Significant Little
Effect
Increase
Decrease
Water content of a clean uniform gravel is
decreased by 6% from the optimum value
A"crushed limestone" is substituted for a "sandy
gravel", both being at optimum moisture
contents
Fines (< No. 200) content of a "clean sand" is
increased from 2% to 20% at the wet side of
optimum
An unsoaked silty clay is soaked for 96 hours
and tested at the same dry side of optimum
moisture content
Density of a "well-graded sand" is decreased
from
100%
compaction
(AASHTO-T180)
to
95%
modi
fied
For a silty subgrade, depth of the water table is
lowered from 20 inches to 50 inches
Organic content is increased from 15% to 30%
A well-graded sand is replaced by a gap- graded
sand with fines increased from 8 to 18%
how do the following factors influence “maximum dry
density"?
Use v to judge what the best answer is.
No
Increase Decrease Change
(a) Compactive effort is changed from "standard"
to "modified" Proctor
(b) Granular material gradation is changed from
"poor" to "well graded"
(c) Material type changes from A-3 to A-2-7
(d) In-situ moisture content increases to 3%
above the "optimum moisture content"
|(e)
Aggregate
from
change
particles
"angular/rough" to "rounded/smooth"
(f) Aggregate specific gravity decreases from
2.75 to 2.67
Transcribed Image Text:how do the following changes influence the CBR? Use V to judge what the best answer is. California Bearing Ratio, CBR Significant Significant Little Effect Increase Decrease Water content of a clean uniform gravel is decreased by 6% from the optimum value A"crushed limestone" is substituted for a "sandy gravel", both being at optimum moisture contents Fines (< No. 200) content of a "clean sand" is increased from 2% to 20% at the wet side of optimum An unsoaked silty clay is soaked for 96 hours and tested at the same dry side of optimum moisture content Density of a "well-graded sand" is decreased from 100% compaction (AASHTO-T180) to 95% modi fied For a silty subgrade, depth of the water table is lowered from 20 inches to 50 inches Organic content is increased from 15% to 30% A well-graded sand is replaced by a gap- graded sand with fines increased from 8 to 18% how do the following factors influence “maximum dry density"? Use v to judge what the best answer is. No Increase Decrease Change (a) Compactive effort is changed from "standard" to "modified" Proctor (b) Granular material gradation is changed from "poor" to "well graded" (c) Material type changes from A-3 to A-2-7 (d) In-situ moisture content increases to 3% above the "optimum moisture content" |(e) Aggregate from change particles "angular/rough" to "rounded/smooth" (f) Aggregate specific gravity decreases from 2.75 to 2.67
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