Engineering
Hydrometer Analysis Background Information and Purpose Lab Report

### Question Description

I’m studying for my Engineering class and don’t understand how to answer this. Can you help me study?

• TEXTBOOK : Hydrometer Analysis : Lab 5 in 8th, 9th edition
• Objective : To determine Grain Size Distribution in a soil for the fraction that is finer than U.S. No.200 sieve size(0.075mm) using hydrometer analysis
• ASTM hydrometer is calibrated up to a reading of 60 at T=20ºC for soil particles having Gs = 2.65
• Hydrometer reading = 30? 30g of soil solids in suspension per 1000 ml of soil-water mixture at T=20ºC.
• Corrections
• Temperature Correction FT = -4.85+0.25T
• Meniscus Correction Fm : the difference between the top and bottom of the meniscus.
• Zero Correction Fz : Accounts for the effect of using a deflocculating agent.
RatnaYesuraj CR, (2016, May 19). Lab #2A Hydrometer Analyis [Video]. YoutubeSubmit a lab report using experimental data presented below and given in Table 3-1.Fz = 4, Fm = 1, Gs = 2.75, a = 0.98, A= 0.0128Table 3-1. Hydrometer Analysis Data  Time Hydrometer Reading Temperature 0.25 49 23 0.5 48 23 1 46 23 2 41 23 4 35 23 8 26 23 15 20 23 30 16 23 60 13 23 120 11 23 1440 5 23
Lab Report should
1. Write down the procedures described in the video(RatnaYesuraj, 2016) and compare them with the procedures given in the laboratory textbook if necessary.
2. Present the completed test table, sample calculations, and the grain-size distribution graph similar to that shown in Fig.5-6 in the textbook.
3. Discussion section will include the semilogarithmic plot combining the results of sieve and hydrometer analysis (see step 9 and 10 in section 5.6) and the percentages of various fractions of gravel, sand, silt and clay, and clay-size particles present in the soil.
4. Follow lab report guidelines under Modules/Lab Information on Canvas.

### Unformatted Attachment Preview

Lab 3. Hydrometer Analysis (Lab 5 in 8th, 9th edition)  Determination of Grain Size Distribution in a soil for the fraction that is finer than U.S. No.200 sieve size(0.075mm)  Quantify the soil material remaining in suspension at each stage of the sedimentation process L  ASTM hydrometer is calibrated up to a reading of 60 at T=20ºC for soil particles having Gs = 2.65 – Hydrometer reading = 30? 30g of soil solids in suspension per 1000 ml of soil-water mixture at T=20ºC.  Corrections – Temperature Correction FT = -4.85+0.25T – Meniscus Correction Fm – Zero Correction Fz  Hydrometer reading at the top of the meniscus in the control cylinder  If zero reading is below water, (-)  If above, (+) Reading during Lab Fz Fm Correct Reading  Procedures – Use a prepared sample mixture for step 3. – In step 5, no constant-temp bath. Taking the temperature T of the control solution at room temp. – Take hydrometer reading at cumulative times t= 0.25, 0.5, 1, 2, 4, 8, 15, 30, 60, 120 minutes and 24 hours  Analysis – Assume that Specific Gravity of Soil = 2.75 – If “A” value in the data table cannot be obtained from Table 5-2, then use the formula (See page 34 in 8th ed. or page 36 in 9th ed.) 𝐴 = √(𝐺 30𝜂 𝑠 −1)𝛾𝑤 where η = viscosity of water, γω = unit weight of water  Lab Report (see section 5.8 in your textbook) – Results section should include data table, sample calculations, and the grain-size distribution graph similar to that shown in Fig.5-6 in the textbook. – Discussion section will include the semilogarithmic plot combining the results of sieve and hydrometer analysis (see step 9 and 10 in section 5.6) and the percentages of various fractions of gravel, sand, silt and clay, and clay-size particles present in the soil. ...
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Attached.

Sieve No.
4
10
20
40
60
140
200

529,3
Sieve
Mass of Sieve and
Opening Mass of
Soil Retained Ms+n
(mm)
Sieve Ms (g) (g)
4,75
502,5
565,6
2
423,1
544,3
0,85
369,1
459,1
0,425
345
410,5
0,25
323,2
363,8
0,106
323,7
374,4
0,075
412,2
431
Total Sample Weight

D60
D30
D10
0,67669
0,30103
-0,07058
-0,37161
-0,60206
-0,97469
-1,12494

Mass of Soil
Retained on
Each Sieve
Mn (g)
63,1
121,2
90
65,5
40,6
50,7
18,8

Percent of
Mass Retained
on Each Sieve
Rn
14%
27%
20%
15%
9%
11%
4%
100%

449,9

60%
30%
10%

2,098
0,586
0,180

60%
100
2,098
2,098

60%
60%
0

30%
100
0,586
0,586

30%
30%
0

10%
100
0,180
0,180
D (mm)
-1,11577
-1,2636
-1,4034
-1,53611
-1,66354
-1,78781
-1,90658
-2,04576
-2,18709
-2,33724

10%
10%

0

PT (10%)
0,0766
0,0545
0,0395
0,0291
0,0217
0,0163
0,0124
0,009
0,0065
0,0046

98%
96%
92%
82%
70%
62%
40%
32%
26%
22%

Percent Finer (%)

M

-2,5

-2,85387

0,0014

10%

Cummulative
Percent
Percent Finer
Retained R
100-Rn
14%
86%
41%
59%
61%
39%
76%
24%
85%
15%
96%
4%
100%
0%

Sieve Analysis
100%
90%
80%

Percent Finer (%)

70%
60%
50%
40%
30%
D30

20%
10%
0%

Particle Size D (mm)

0,1

D10

1

D30

10

D60

100

Semilogarithmic Curve
100%
90%

Percent Finer (%)

80%
70%
60%
50%

40%
30%
20%
10%
0%

-2,5

-2

-1,5

-1

-0,5

Log Diameter

0

0,5

1

0,01

Log Diameter

0,01

Percent Finer (%)

1

Lab 3: Hydrometer Analysis

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Amr254 (1103)
New York University
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