A carefully-weighed 52.9 gram soil sample was dispersed for particle-size analysis using the Bouyoucos hydrometer method. The laboratory was held at a constant temperature of 20 C (68 F). The hydrometer reading after 40 seconds was 20.1 and the hydrometer reading after 8 hours was 5.1. What percentage of particles in the soil sample were clay-sized? Your Answer: Answer units
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- A carefully-weighed 45.3 gram soil sample was dispersed for particle-size analysis using the Bouyoucos hydrometer method. The laboratory was held at a constant temperature of 20 C (68 F). The hydrometer reading after 40 seconds was 20.8 and the hydrometer reading after 8 hours was 12.1. How many grams of particles in the soil sample were silt-sized? Your Answer: Answer unitsA carefully-weighed 51.3 gram soil sample was dispersed for particle-size analysis using the Bouyoucos hydrometer method. The laboratory was held at a constant temperature of 20 C (68 F). For the soil to have 47 % clay-sized particles in this sample, the 8 hour hydrometer reading would have to be: Your Answer: Answer unitsA liquid limit test on a clay was performed with the following results. The natural water content of the clay is 38% and plastic limit is 21%. Number of Blows 6 12 20 28 32 Water content (%) 52.5 47.1 42.3 38.6 37.5 What is the liquidity index of this clay? (Use Interpolation) Group of answer choices 0.895 0.96 1.08 0.90 Please answer this asap. For upvote. Thanks
- In falling head permeability test the initial head was 350 mm and the final head was 60 mm. The cross-sectional area of the burette was 200 mm2. The sample was 50 mm in diameter and 105 mm long. If the test took 8 hours and 30 minutes, what was the coefficient of permeability of the soil in m/s?The permeability test must be carried out on a soil sample 15 cm long and 8 cm in diameter using the permeameter illustrated below. What is the difference between a variable head permeameter and a constant head permeameter?What is the disadvantage of using the constant head permeameter for all soil types? Which pemeameter is it in the illustration below? Justify your answer.How to calculate the permeability coefficient when the pressure drop is maintained at 30 cm and it takes 2 min and 35 s to collect a volume of water of 200 ml? Is it possible to identify the soil from this result? If so, what soil is it?Consider that a 58.7 gram sample of dry soil is used in making a mechanical analysis by using the hydrometer method. The laboratory was held at a constant temperature of 20 C (68 F). The 40 s hydrometer reading was found to be 32.5 and the 8 hr hydrometer reading was 15.5. The percentage of sand in this soil sample is (note, a 58.7 gram sample is used here): Your Answer: Answer units
- A sample of moist sand was cut out of a natural deposit by means of a sampling cylinder. The volume of the cylinder was 478 ml; the weight of the sample alone was 884 grams and 830 grams after drying. The volume of the dried sample, when rammed tight into a graduated cylinder, was 418 ml and its volume, when poured loosely into the same cylinder, was 616 ml. if the particle specific gravity was 2.67, compute the density index and the degree of saturation of the deposit.A glass cylinder 5 cm internal diameter and with a screen at the bottom was used as a falling head permeameter. The thickness of the sample was 10 cm. With the water Level in the tube at the start of the test as 50 cm above the tail water, it dropped by 10 cm in one minute, the tail water level remaining unchanged. Calculate the value of k for the sample of the soil, Comment on the nature of the soil,Maximum and minimum void ratios of a sand sample were determined in the laboratory to be 0.9 and 0.3, respectively. If the void ratio of another sample of the same sand is found to be 0.53, calculate the relative density of the second sand sample. (Type your answer as a percentage %)
- 3- A series of standard Proctor compaction tests were performed on soil and the obtained results are presented in Figure below. The volume of the standard mould was 1 x 10³ m³ and Gs = 2.65. 1.82 1.80 1.78 1.76 What is the degree of saturation of the sample compacted to the maximum dry density? Estimate the volume of air (in m3) in the sample compacted to 15% water content. The void ratio of this soil in its loosest state is 1.74 1.72 1.70 1.68 1.66 0.623. Estimate the relative density of the soil sample compacted to 11% water content? 10 11 12 13 14 15 16 17 18 19 20 21 22 Water content (%) Dry density (g cm-3)Permeability tests were performed on a soil sample, under different void ratio and different temperatures and the following results were obtained. Test No. 1 2 Void ratio Temperature °C (e) 0.65 1.02 25° 40⁰ Estimate the coefficient of permeability at a temperature of 20°C for a voids ratio of 0.80. Given the following physical properties of water: At 20°C, n = 10.09 × 10+ and p„ = 0.998 g/cm³ At 25°C, n = 8.95 × 104 g sec/cm² and p k(cm/s) 0.4x10 1.9x10¹ At 40° C, n = 6.54 × 10 g sec/cm² and p 8 0.997 g/cm³ = 0.992 g/cm³Limit tests performed on a clay indicate a liquid limit of 67 percent and a plastic limit of 32 percent. From a hydrometer analysis to determine particle sizes, it is found that 40 percent of the sample consists of particles smaller than 0.002 mm. From this information, indicate the activity classification for this clay and the probable type of clay mineral.