Skip to content

Commit 3415aab

Browse files
shraddhashraddha
authored
Merge pull request #8 from virtual-labs/testing
Modified the textual content
2 parents 99ac3e0 + 0793b5e commit 3415aab

9 files changed

Lines changed: 419 additions & 204 deletions

File tree

‎.gitignore‎

Lines changed: 6 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,6 @@
1+
node_modules/
2+
package.json
3+
package-lock.json
4+
build/
5+
plugins/
6+
.DS_Store

‎experiment-descriptor.json‎

Lines changed: 8 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -2,10 +2,18 @@
22
"unit-type": "lu",
33
"label": "",
44
"basedir": ".",
5+
"LaTeXinMD": "true",
56
"units": [
67
{
78
"unit-type": "aim"
89
},
10+
{
11+
"target": "objective.html",
12+
"source": "objective.md",
13+
"label": "Objective",
14+
"unit-type": "task",
15+
"content-type": "text"
16+
},
917
{
1018
"target": "theory.html",
1119
"source": "theory.md",
@@ -50,4 +58,3 @@
5058
}
5159
]
5260
}
53-

‎experiment/aim.md‎

Lines changed: 1 addition & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -1 +1 @@
1-
To determine the Optimum Moisture Content (OMC) and maximum dry density of a soil sample by the standard Proctor compaction test.
1+
To determine the optimum moisture content and maximum dry density of a soil sample using the Standard Proctor compaction test.

‎experiment/objective.md‎

Lines changed: 4 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -1,3 +1,5 @@
1-
To determine the Optimum moisture content and maximum dry density of a soil by standard proctor compaction test.
1+
The objectives of this experiment are to:
22

3-
[Read More](docs/CompactionTest.pdf)
3+
- Determine the optimum moisture content and maximum dry density of a soil sample.
4+
- Understand the principle and procedure of the Standard Proctor compaction test.
5+
- Learn the importance of soil compaction in the construction of foundations, embankments, and pavements.

‎experiment/posttest.json‎

Lines changed: 156 additions & 105 deletions
Large diffs are not rendered by default.

‎experiment/pretest.json‎

Lines changed: 156 additions & 88 deletions
Original file line numberDiff line numberDiff line change
@@ -1,90 +1,158 @@
11
{
2-
"version": 2.0,
3-
"questions": [
4-
{
5-
"question": "1. Compaction of a soil is measured in terms of which of the following?",
6-
"answers": {
7-
"a": "Compressibility",
8-
"b": "Specific gravity",
9-
"c": "Dry density",
10-
"d": "Permeability"
11-
},
12-
"explanations": {
13-
"a": "Like compaction, the compressibility of a soil is the ability of soil to decrease its volume under the action of mechanical loads. This itself depends on dry density of the soil.",
14-
"b": "Compaction does not depend upon the specific gravity of a soil that is dependent on dry density and the amount of water content needed for the compactive effort.",
15-
"c": "Compaction of soil is measured in terms of dry density. The addition of water to a dry soil helps in bringing the solid particles together by coating them with thin films of water. At low water content, the soil is stiff and it is difficult to pack it together. As the water content is increased, the water starts acting as a lubricant and the particles come closer under a given amount of compactive effort. The soil-water-air mixture starts occupying less volume affecting a gradual increase in dry density. As more and more water is added, a stage is reached when the air content of soil attains a minimum volume thus making dry density a maximum. Hence compaction is measured in terms of dry density.",
16-
"d": "Compaction is a process where water is added to the dry soil and the particles of the soil come together making the soil firm whereas the permeability of the soil is the ability of soil to allow water to flow through its voids."
17-
},
18-
"difficulty": "beginner",
19-
"correctAnswer": "c"
20-
},
21-
{
22-
"question": "2. Relative compaction is ____.",
23-
"answers": {
24-
"a": "Similar to relative density",
25-
"b": "A compaction process",
26-
"c": "Dry density obtained in the field",
27-
"d": "A ratio of d of field to the d of lab"
28-
},
29-
"explanations": {
30-
"a": "By definiton, relative compaction (also called as degree of compaction) is the ratio of <i>in-situ</i> dry unit weight etching by compaction to the maximum dry unit weight obtained from an appropriate standard compaction test in the laboratory.",
31-
"b": "By definiton, relative compaction (also called as degree of compaction) is the ratio of <i>in-situ</i> dry unit weight etching by compaction to the maximum dry unit weight obtained from an appropriate standard compaction test in the laboratory.",
32-
"c": "By definiton, relative compaction (also called as degree of compaction) is the ratio of <i>in-situ</i> dry unit weight etching by compaction to the maximum dry unit weight obtained from an appropriate standard compaction test in the laboratory.",
33-
"d": "Relative compaction (also called as degree of compaction) is the ratio of <i>in-situ</i> dry unit weight etching by compaction to the maximum dry unit weight obtained from an appropriate standard compaction test in the laboratory."
34-
},
35-
"difficulty": "beginner",
36-
"correctAnswer": "d"
37-
},
38-
{
39-
"question": "3. Standard Proctor test is also known as ____.",
40-
"answers": {
41-
"a": "I.S heavy compaction test",
42-
"b": "I.S light compaction test",
43-
"c": "Jodhpur minicompacter test",
44-
"d": "None of the above"
45-
},
46-
"explanations": {
47-
"a": "The weight of the rammer is 45 N and falls from a height of 450 mm. Modified Proctor test is used for heavier compaction for the construction of airport pavements, etc. The compactive energy delivered is of the order of 2726 N-m per 1 cubic meter of soil which is about 4.5 times that of standard Proctor test.",
48-
"b": "The weight of the rammer is 25 N and falls from a height of 300 mm. In a standard Proctor test, the compactive energy delivered is of the order of 605.777 N-m per 1 cubic meter of soil.",
49-
"c": "The weight of the rammer is 25 N and falls from a height of 250 mm. The compactive energy delivered is of the order of 625 N-m per 1 cubic meter of soil. Optimum moisture contents obtained from Jodhpur minicompacter are comparable to those obtained from standard Proctor test.",
50-
"d": "One of the other options does contain the right name."
51-
},
52-
"difficulty": "beginner",
53-
"correctAnswer": "b"
54-
},
55-
{
56-
"question": "4. The modified Proctor test is used for which of the following?",
57-
"answers": {
58-
"a": "Runways",
59-
"b": "Highways",
60-
"c": "Embankments",
61-
"d": "Earthen dams"
62-
},
63-
"explanations": {
64-
"a": "The weight of the rammer is 45 N and falls from a height of 450 mm. Modified Proctor test is used for heavier compaction for the construction of airport pavements, etc. The compactive energy delivered is of the order of 2726 N-m per 1 cubic meter of soil which is about 4.5 times that of standard Proctor test. Heavy compaction is required for runways because the runway should resist the amount of dynamic load from the aircraft during take-off and landing.",
65-
"b": "Standard Proctor test is enough for these.",
66-
"c": "Standard Proctor test is enough for these.",
67-
"d": "Standard Proctor test is enough for these."
68-
},
69-
"difficulty": "beginner",
70-
"correctAnswer": "a"
71-
},
72-
{
73-
"question": "5. Which of the following values increases due to compaction?",
74-
"answers": {
75-
"a": "Shear strength",
76-
"b": "Void ratio",
77-
"c": "Percent of air voids",
78-
"d": "None of the above"
79-
},
80-
"explanations": {
81-
"a": "During compaction, the soil particles come closer and the soil becomes firm, improving its shear strength.",
82-
"b": "Void ratio decreases during compaction.",
83-
"c": "Since void ratio decreases, percentage of air voids also decreases during compaction.",
84-
"d": "One of the other options does contain the right answer."
85-
},
86-
"difficulty": "intermediate",
87-
"correctAnswer": "a"
88-
}
89-
]
2+
"version": 2.0,
3+
"questions": [
4+
{
5+
"question": "1. Compaction of a soil is measured in terms of which of the following?",
6+
"answers": {
7+
"a": "Compressibility",
8+
"b": "Specific gravity",
9+
"c": "Dry density",
10+
"d": "Permeability"
11+
},
12+
"explanations": {
13+
"a": "Incorrect. Compressibility is the decrease in volume under static load, while compaction is the increase in density due to dynamic effort.",
14+
"b": "Incorrect. Specific gravity is a property of the soil solids and does not measure the state of compaction.",
15+
"c": "Correct. Compaction is the process of increasing the soil density by packing the particles closer together through mechanical effort, and it is measured by the dry unit weight or dry density.",
16+
"d": "Incorrect. Permeability is affected by compaction but is not the measure of compaction itself."
17+
},
18+
"difficulty": "beginner",
19+
"correctAnswer": "c"
20+
},
21+
{
22+
"question": "2. Relative compaction is defined as ____.",
23+
"answers": {
24+
"a": "Similar to relative density",
25+
"b": "A compaction process",
26+
"c": "Dry density obtained in the field",
27+
"d": "A ratio of field dry density to the laboratory maximum dry density"
28+
},
29+
"explanations": {
30+
"a": "Incorrect. Relative density is used for cohesionless soils based on void ratios, whereas relative compaction is a ratio of dry densities.",
31+
"b": "Incorrect. It is a numerical ratio used for quality control, not the process itself.",
32+
"c": "Incorrect. Field dry density is just one part of the ratio.",
33+
"d": "Correct. Relative compaction is the ratio of the dry density achieved in the field to the maximum dry density obtained in a standard laboratory compaction test."
34+
},
35+
"difficulty": "beginner",
36+
"correctAnswer": "d"
37+
},
38+
{
39+
"question": "3. Standard Proctor test is also known as ____.",
40+
"answers": {
41+
"a": "I.S heavy compaction test",
42+
"b": "I.S light compaction test",
43+
"c": "Jodhpur minicompacter test",
44+
"d": "None of the above"
45+
},
46+
"explanations": {
47+
"a": "Incorrect. The heavy compaction test corresponds to the Modified Proctor test.",
48+
"b": "Correct. The Standard Proctor test is equivalent to the Indian Standard (I.S.) light compaction test, using a 2.6 kg rammer.",
49+
"c": "Incorrect. This is a different type of miniature compaction test.",
50+
"d": "Incorrect. One of the provided options is the correct alternative name."
51+
},
52+
"difficulty": "beginner",
53+
"correctAnswer": "b"
54+
},
55+
{
56+
"question": "4. The modified Proctor test is used for which of the following?",
57+
"answers": {
58+
"a": "Runways",
59+
"b": "Highways",
60+
"c": "Embankments",
61+
"d": "Earthen dams"
62+
},
63+
"explanations": {
64+
"a": "Correct. Modified Proctor tests are used for structures subjected to very heavy loads, such as airfield runways and heavy-duty pavements.",
65+
"b": "Incorrect. Standard Proctor tests are usually sufficient for typical highway construction.",
66+
"c": "Incorrect. Embankments for general purposes often use standard compaction effort.",
67+
"d": "Incorrect. Earthen dams typically use standard or intermediate compaction depending on the zone."
68+
},
69+
"difficulty": "beginner",
70+
"correctAnswer": "a"
71+
},
72+
{
73+
"question": "5. Which of the following values increases due to compaction?",
74+
"answers": {
75+
"a": "Shear strength",
76+
"b": "Void ratio",
77+
"c": "Percent of air voids",
78+
"d": "Permeability"
79+
},
80+
"explanations": {
81+
"a": "Correct. Compaction increases the density and interlocking of particles, which significantly improves the shear strength of the soil.",
82+
"b": "Incorrect. Void ratio decreases as particles are packed closer together.",
83+
"c": "Incorrect. Air voids are reduced during the compaction process.",
84+
"d": "Incorrect. Permeability decreases because the flow paths are restricted by the increased density."
85+
},
86+
"difficulty": "intermediate",
87+
"correctAnswer": "a"
88+
},
89+
{
90+
"question": "6. The water content at which a soil can be compacted to its maximum dry density is called:",
91+
"answers": {
92+
"a": "Plastic limit",
93+
"b": "Liquid limit",
94+
"c": "Optimum moisture content",
95+
"d": "Saturation water content"
96+
},
97+
"explanations": {
98+
"a": "Incorrect. Plastic limit is a consistency limit, not specifically related to the peak of the compaction curve.",
99+
"b": "Incorrect. Liquid limit is the boundary where soil starts to behave like a liquid.",
100+
"c": "Correct. The Optimum Moisture Content (OMC) is the specific water content that allows the soil to reach its maximum dry density for a given compactive effort.",
101+
"d": "Incorrect. Maximum dry density is achieved before the soil is fully saturated."
102+
},
103+
"difficulty": "intermediate",
104+
"correctAnswer": "c"
105+
},
106+
{
107+
"question": "7. In the compaction curve, the line representing zero air voids (ZAV) is also known as:",
108+
"answers": {
109+
"a": "100% saturation line",
110+
"b": "Optimum moisture line",
111+
"c": "Plasticity line",
112+
"d": "A-line"
113+
},
114+
"explanations": {
115+
"a": "Correct. The zero air voids line corresponds to the theoretical state where all voids are filled with water, meaning the degree of saturation is 100%.",
116+
"b": "Incorrect. The OMC point always lies to the left of the ZAV line.",
117+
"c": "Incorrect. This is not a standard term in compaction.",
118+
"d": "Incorrect. The A-line is used in the plasticity chart for soil classification."
119+
},
120+
"difficulty": "intermediate",
121+
"correctAnswer": "a"
122+
},
123+
{
124+
"question": "8. A soil sample has a bulk unit weight of 19 kN/m³ and a water content of 15%. Calculate its dry unit weight.",
125+
"answers": {
126+
"a": "16.52 kN/m³",
127+
"b": "17.24 kN/m³",
128+
"c": "21.85 kN/m³",
129+
"d": "14.35 kN/m³"
130+
},
131+
"explanations": {
132+
"a": "Correct. Dry unit weight (γd) = Bulk unit weight (γ) / (1 + w) = 19 / (1 + 0.15) = 19 / 1.15 = 16.52 kN/m³.",
133+
"b": "Incorrect. Re-calculate using the formula γd = γ / (1 + w).",
134+
"c": "Incorrect. This value is higher than the bulk unit weight, which is physically impossible.",
135+
"d": "Incorrect. Ensure you are dividing by 1.15, not a larger factor."
136+
},
137+
"difficulty": "advanced",
138+
"correctAnswer": "a"
139+
},
140+
{
141+
"question": "9. If the maximum dry density of a soil in the lab is 1.85 g/cc and the field dry density is 1.76 g/cc, what is the relative compaction?",
142+
"answers": {
143+
"a": "90%",
144+
"b": "95.1%",
145+
"c": "105.1%",
146+
"d": "85.5%"
147+
},
148+
"explanations": {
149+
"a": "Incorrect. Check your calculation of the ratio.",
150+
"b": "Correct. Relative Compaction = (Field Dry Density / Lab Max Dry Density) * 100 = (1.76 / 1.85) * 100 = 95.13%.",
151+
"c": "Incorrect. The field density is lower than the lab maximum, so the ratio must be less than 100%.",
152+
"d": "Incorrect. This value is too low; the densities are quite close."
153+
},
154+
"difficulty": "advanced",
155+
"correctAnswer": "b"
156+
}
157+
]
90158
}

‎experiment/procedure.md‎

Lines changed: 11 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -1,9 +1,19 @@
11
1. Add a weighing machine and a mould from the apparatus menu and weigh the mould by clicking on it. Observe the change in the observations menu. The mould is weighed to account for its weight in future measurements of other components added to the mould.
2+
23
2. Click on the mould to move it back away from the weighing machine to make space for other apparatus to be used in the coming steps.
4+
35
3. Add a soil sample and a container of water from the apparatus menu and pour the water onto the soil by clicking on the container. The water is added to get the water content of the soil around 8%. Also observe that the volume of the soil sample is determined as is visible from the value in the observations menu.
6+
47
4. Add a collar to the mould from the apparatus menu. Also add a rammer from the apparatus menu. The rammer will be used to compact the soil by repeated blows/strikes.
8+
59
5. Move a portion (roughly one-third) of the soil to the mould for compaction by clicking on it. Compact the soil to occupy only about one-third of the mould assembly's height by clicking on the rammer. It will take about 25 blows to achieve this. This procedure is repeated two more times until all the soil has been compacted inside the mould assembly.
10+
611
6. Remove the collar and trim off the excess soil with a trimming knife by clicking on the mould. Add a weighing machine from the apparatus menu and weigh the mould with the compacted soil by clicking on it.
7-
7. Take a representative sample from the mould and determine its water content. Use the following <a href='https://sd-iiith.vlabs.ac.in/exp/water-content/'>link</a> to learn more about water content determination.
12+
13+
7. Take a representative sample from the mould and determine its water content. Use the following <a href='https://smfe-iiith.vlabs.ac.in/exp/water-content/'>link</a> to learn more about water content determination.
14+
815
8. Observe the values obtained for different trials in the table. We obtain wet density using the formula: Wet Density = Mass of Wet Soil / Volume of Soil. We obtain the dry density using the formula: Dry Density = Wet Density / (1 + Water Content). Also observe the corresponding graph obtained and derive the optimum moisture content and the maximum dry density values by taking the readings at the peak.
16+
917
9. Click the restart button to perform the experiment again.
18+
19+
**Note:** The user does **not** need to enter any values in the Observation column. The observations and calculations are generated automatically during the simulation.

‎experiment/references.md‎

Lines changed: 4 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -1,2 +1,5 @@
11
1. [Cemm Lab - Compaction](https://cemmlab.webhost.uic.edu/Experiment%209-Compaction.pdf)
2-
2. Soil Mechanics Laboratory Manual, Braja M. Das
2+
2. IS: 2720 (Part VII) – Determination of Water Content-Dry Density Relation Using Light Compaction.
3+
3. Soil Mechanics and Foundations, 3rd Edition, Muniram Budhu.
4+
4. Soil Mechanics Laboratory Manual, Braja M. Das.
5+
5. Geotechnical Engineering: Principles and Practices of Soil Mechanics and Foundation Engineering, V.N.S. Murthy.

0 commit comments

Comments
 (0)