Number 11 11. What is the significance of the number of the sieves? To be precise, what does 200 mean in#200 sieve?12. Name two laboratory methods to determine the permeability of a soil? Which method is mostapplicable for sands, and which method is for clays?13. Calculate moisture content from the following data:Weight of can = 23.4 g; weight of can + wet soil = 188.4 g; weight of can + dry soil = 166.5 g

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Engineering

Civil Engineering

11. What is the significance of the number of the sieves? To be precise, what does 200 mean in # 200 sieve?

Principles of Geotechnical Engineering (MindTap Course List)

9th Edition

ISBN:9781305970939

Author:Braja M. Das, Khaled Sobhan

Publisher:Braja M. Das, Khaled Sobhan

Chapter4: Plasticity And Structure Of Soil

Section: Chapter Questions

Problem 4.12P

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Concept explainers

Bars

In civil engineering, bars refer to steel reinforcement bars or rebars. These are structural members primarily used for reinforcement purposes in masonry works. A bar is characterized by its cross-sectional area, which is negligible compared to its length. Bars are usually manufactured by steel which is uniform throughout the length, or by meshing multiple steel wires. Other materials of the bar include carbon steel, glass fiber, carbon fiber, and basalt fiber. The reinforcing bars are coated with epoxy resins and other materials to enhance some of their properties including corrosion resistance.

Question

Number 11

11. What is the significance of the number of the sieves? To be precise, what does 200 mean in
#200 sieve?
12. Name two laboratory methods to determine the permeability of a soil? Which method is most
applicable for sands, and which method is for clays?
13. Calculate moisture content from the following data:
Weight of can = 23.4 g; weight of can + wet soil = 188.4 g; weight of can + dry soil = 166.5 g

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PROBLEM1 The result of the sieve analysis is shown below: a. What is percentage of the soil is retained in no.200 sieve? b. What is the effective grain size of the soil in mm? c. Determine the uniformity coefficient. Sieve no Diameter (mm) Mass retained grams 4 4.76 25 8. 2.23 80 10 2.00 110 20 0.84 160 40 0.42 180 60 0.25 220 80 0.180 380 100 0.149 590 200 0.074 110 PAN 85
1- For a soil, suppose that Dio = 0.08 mm, D3o = 0.22 mm, and Dso = 0.41 mm. Calculate the uniformity coefficient and the coefficient of gradation. 2- The following are the results of a sieve analysis: U.S. sieve no. Mass of soil retained (g) 4 10 18.5 20 53.2 40 90.5 60 81.8 100 92.2 200 58.5 Pan 26.5 a. Determine the percent finer than each sieve and plot a grain-size distribution curve. b. Determine Dio, D30, and D6o from the grain-size distribution curve. c. Calculate the uniformity coefficient, Cu. d. Calculate the coefficient of gradation, Cc.
Let us assume that a soil sample taken in the field is taken and it must be identified by the SUCS Method and AASHTO Method. Moisture content = 5.75% Limit liquid = 53.5 Plastic limit = 31.6 Granulometry Sieve % Pass No. 4 100 # 40 68 # 200 54.3 Do you select the best answer? a) Inorganic silt and sand, with low plasticity b) Inorganic clay with low plasticity c) Clay silt, traces of gravel, dark Brown
The grain-size characteristics of soil re given in the following table. Use Table 2.3 for the analysis. Size (mm) Percent finer 0.425 100 0.1 79 0.04 57 0.02 48 0.01 40 0.002 35 0.001 33 Table 2.3 Particle-Size Classifications Grain size (mm) Name of organization Gravel Sand Silt Clay Massachusetts Institute of Technology (MIT) >2 2 to 0.06 0.06 to 0.002 2 <0.002 76.2 to 2 2 to 0.075 0.075 to 0.002 <0.002 Fines (i.e., silts and clays) <0.075 76.2 to 4.75 4.75 to 0.075 Note: Sieve openings of 4.75 mm are found on a U.S. No. 4 sieve; 2-mm openings on a U.S. No. 10 sieve; 0.075-mm openings on a U.S. No. 200 sieve. See Table 2.5. i.) What is the percentages of gravel, sand, silt and clay according to the MIT system. a.) Gravel – 0%; Sand – 38%; Silt – 30%; Clay – 35% b.) Gravel – 0%; Sand – 37%; Silt – 30%; Clay – 35% c.) Gravel – 0%; Sand – 36%; Silt – 30%; Clay – 35% d.) Gravel – 0%; Sand – 35%; Silt – 30%; Clay – 35% e.) None of the above
The grain-size characteristics of soil re given in the following table. Use Table 2.3 for the analysis. Size (mm) Percent finer 0.425 100 0.1 79 0.04 57 0.02 48 0.01 40 0.002 35 0.001 33 Table 2.3 Particle-Size Classifications Grain size (mm) Name of organization Gravel Sand Silt Clay Massachusetts Institute of Technology (MIT) >2 2 to 0.06 0.06 to 0.002 2 <0.002 76.2 to 2 2 to 0.075 0.075 to 0.002 <0.002 Fines (i.e., silts and clays) <0.075 76.2 to 4.75 4.75 to 0.075 Note: Sieve openings of 4.75 mm are found on a U.S. No. 4 sieve; 2-mm openings on a U.S. No. 10 sieve; 0.075-mm openings on a U.S. No. 200 sieve. See Table 2.5. What is the percentages of gravel, sand, silt and clay according to the USDA system a.) Gravel – 0%; Sand – 38%; Silt – 26%; Clay – 35% b.) Gravel – 0%; Sand – 38%; Silt – 27%; Clay – 33% c.) Gravel – 0%; Sand – 38%; Silt – 26%; Clay – 34% d.) Gravel – 0%; Sand – 38%; Silt – 27%; Clay – 35% e.) None of the above
7. Following details regarding the particle size distribution and other index properties pertinent to the classification of soil. Choose three soils and classify each soil according to USCS and AASHTO classification systems. When necessary, assume Cu = 4.48 and C = 1.22. Your solution may be presented in similar form as what was included in your module 4. Sieve Analysis (Percent Finer) Soil No Liquid Limit Plastic Limit No. 10 No. 40 No. 200 1 98 80 50 38 29 2 100 92 80 56 23 3 100 88 65 37 22 4 85 55 45 28 20 5 92 75 62 43 28 6 48 28 6 N.A. NP 7 87 62 30 32 24 8 90 76 34 37 25 9 100 78 8 N.A. NP 10 92 74 32 44 35
a. 100 cm3 saturated sample of quartz sand is weighed, gravity drained, weighed, oven dried, and weighed again. The saturated, gravity-drained, and oven-dried weights are 130g, 110 g, and 105 g, respectively. Using these data, calculate the following quantities. i. Dry bulk density ii. Porosity iii. Degree of saturation after gravity drainage iv. Specific yield b. Given that the soil sample in part (a) above has porosity of 35%. i. Determine the void ratio of this soil. ii. If 50% of the void space is filled with water, with the remaining 50% filled with air, determine the volumetric water content, θ. iii. and the degree of saturation, S.
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