1) 35 POINTSPlot the Standard Proctor curve of dry unit weight versus water content (seebelow table) and;a) Indicate the maximum dry unit weight and optimum water content.b) What range of water content would be acceptable if the specifications requireat least 98% relative compaction and water content dry of optimum? Showhow you calculated the relative compaction and show on the plot the range ofwater contentsWater Content(%)Dry Unit Weight (pcf) Specific Gravity=2.708111111131151141417201092) 15 PointsA sample of soil has a wet weight of 62 lbs. and a volume of 0.56 cubic feet.When dried in an oven the soil weigh 50 lbs. If specific gravity of the soil is 2.64,determine the water content, wet unit weight, dry unit weight, and void ratio ofthe soil.3) 50 PointsClassify the five soils according to the AASHTO method of soil classification.(a) A sampie of well-graded gravel with sand has 73% fine to coarse subangular gravel, 25% fineto coarse subangular sand, and 2% fines. The maximum size of the particles is 75 mm. Thecoefficient of curvature is 2.7, while the uniformity coefficient is 12.4.(b) A dark brown, wet, organic-odor soil has 100% passing the No. 200 sieve. The liquid Nmit is32% (not dried, and is 21% when oven dried!) and the plastic index is 21% (not dried).(c) This sand has 61% predominately fine sand, 23% silty fines, and 16% fine subrounded gravelsize. The maximum size is 20 mm. The liquid limit is 33% and the plastic limit is 27%.(d) This material has 74% fine to coarse subangular reddish sand and 26% organic and silty darkbrown fines. The liquid limit (not dried) is 37% while it is 26% when oven dried. The plastic index(not dried) is 6.(e) Although this soil has only 6% nonplastic sity fines, it has everything else! It has gravelcontent of 78% fine to coarse subrounded to subangular gravel, and 16% fine to coarsesubrounded to subangular sand. The maximum size of the subrounded boulders is 500 mm. Theuniformity coefficient is 40, while the coefficient of curvature is only 0.8.

Plot the compaction curve by keeping water content along the horizontal axis and the dry unit weight…

Plot the Standard Proctor curve of dry unit weight versus water content (see below table) and; a) Indicate the maximum dry unit weight and optimum water content. b) What range of water content would be acceptable if the specifications require at least 98% relative compaction and water content dry of optimum? Show how you calculated the relative compaction and show on the plot the range of water contents Water Content(%) Dry Unit Weight (pcf) Specific Gravity=2.70 8 11 14 113 115 17 20 114 109

Plot the Standard Proctor curve of dry unit weight versus water content (see below table) and; a) Indicate the maximum dry unit weight and optimum water content. b) What range of water content would be acceptable if the specifications require at least 98% relative compaction and water content dry of optimum? Show how you calculated the relative compaction and show on the plot the range of water contents Water Content(%) Dry Unit Weight (pcf) Specific Gravity=2.70 8 11 14 113 115 17 20 114 109

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Concept explainers

Soil Compaction Test

Soil compaction is the major area of geotechnical engineering. Soil is composed of multiple pores present on its surface, while the soil is mainly composed of gravel, sand, rocks, etc. The arrangement of these rocks and gravels is such that they build up voids (spaces) between them, which allows spaces for the roots of the plants and crops to spread and absorb the required amount of nutrients. Soil compaction is a major problem primarily caused by human activities, micro-organisms, and other multiple factors.

Question

1) 35 POINTS
Plot the Standard Proctor curve of dry unit weight versus water content (see
below table) and;
a) Indicate the maximum dry unit weight and optimum water content.
b) What range of water content would be acceptable if the specifications require
at least 98% relative compaction and water content dry of optimum? Show
how you calculated the relative compaction and show on the plot the range of
water contents
Water Content(%)
Dry Unit Weight (pcf) Specific Gravity=2.70
8
111
11
113
115
114
14
17
20
109
2) 15 Points
A sample of soil has a wet weight of 62 lbs. and a volume of 0.56 cubic feet.
When dried in an oven the soil weigh 50 lbs. If specific gravity of the soil is 2.64,
determine the water content, wet unit weight, dry unit weight, and void ratio of
the soil.
3) 50 Points
Classify the five soils according to the AASHTO method of soil classification.
(a) A sampie of well-graded gravel with sand has 73% fine to coarse subangular gravel, 25% fine
to coarse subangular sand, and 2% fines. The maximum size of the particles is 75 mm. The
coefficient of curvature is 2.7, while the uniformity coefficient is 12.4.
(b) A dark brown, wet, organic-odor soil has 100% passing the No. 200 sieve. The liquid Nmit is
32% (not dried, and is 21% when oven dried!) and the plastic index is 21% (not dried).
(c) This sand has 61% predominately fine sand, 23% silty fines, and 16% fine subrounded gravel
size. The maximum size is 20 mm. The liquid limit is 33% and the plastic limit is 27%.
(d) This material has 74% fine to coarse subangular reddish sand and 26% organic and silty dark
brown fines. The liquid limit (not dried) is 37% while it is 26% when oven dried. The plastic index
(not dried) is 6.
(e) Although this soil has only 6% nonplastic sity fines, it has everything else! It has gravel
content of 78% fine to coarse subrounded to subangular gravel, and 16% fine to coarse
subrounded to subangular sand. The maximum size of the subrounded boulders is 500 mm. The
uniformity coefficient is 40, while the coefficient of curvature is only 0.8.

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