the difference between flocculated and deflocculated particles in terms of their sedimentation and redispersion behavior.
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Describe the difference between flocculated and deflocculated particles in terms of their sedimentation and redispersion behavior.
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- Define the purpose of the sedimentation process. What types of particles are removed from the water through clarification? What type of settling behavior exhibit the particles formed by the coagulation- flocculation process?Find the diameter and height of Circular Sedimentation Tank5 What is the difference between discrete sedimentation and flocculent sedimentation?
- Question 24 Yiren was given a soil sample which yields the following passing percentage for different sieves. Sieve No. Diameter(mm) Percent Passing (%) 99 No. 4 4.760 No. 8 2.380 94 No. 10 2.000 76 No. 20 0.840 66 No. 40 0.420 63 No. 60 0.250 55 No. 100 0.149 50 No. 200 0.074 31 Characteristics of Fraction Passing No. 40 LL = 42 PL = 18 What will be this soil's resulting group index? Follow rules provided by AASHTO. General classification Granular materials (35% or less of total sample passing No. 200) А-1 A-2 Group classification A-1-a A-1-b A-3 Л-2-4 A-2-5 А-2-6 A-2-7 Sieve analysis (percent passing) No. 10 No, 40 No. 200 50 max. 30 max. 50 max. 51 min. 15 max. 25 max 10 max. 35 max. 35 max. 35 max. 35 max. Characteristics of fraction passing No. 40 Liquid limit 40 max. 41 min. 40 max. 41 min. F4 ES F6 F7 因Why is sedimentation concentration technique better than the floatation technique?In soil compaction test, if a test result exceeds 100%, should engineers accept the result?
- 2- Explain scouring in the sedimentation tankAnswer the following questions. 1. What are the procedures in water and Sediment test? 2. What are the equipment/s to be used and identify each?Which compaction test will be preferred in the laboratory for determining the optimum moisture content (OMC) of soil to be used in the construction of subgrade for low-volume rural roads? a.Standard proctor test b.CBR test c.Marshall test d.Modified proctor test
- 1. The following results were obtained from particle size distribution analysis of three soils - A, B and C. Sieve # 1/2 in 3/8 in #4 # 10 #40 #100 #200 Diameter (mm) 12.5 9.5 4.75 2 0.425 0.15 0.075 0.02 0.003 0.001 WL (or LL, liquid limit) wp (or PL, plastic limit) w (natural water content) Soil A 100 96 89 82 67 57 47 28 8 Percent passing Soil B 3 25 16 11 100 98 82 33 12 5 5 Soil C 100 99 97 85 55 43 51 19 26.5 Required: (1) Plot the particle size distribution curves (semi-log). Determine the following quantities of each soil: the effective particle size dio, the mean particle side d50, the coefficients of uniformity and curvature (if possible). (2) According to the particle size distribution, when the engineering properties are concerned, which soil is the most sensitive to water and which soil is mostly affected by density? Give you logic. (3) Classify the soils according to the USCS.A hydrometer test has the following result: Gs = 2.65, temperature of water = 26 C, and L = 10.4 cm at 45 minutes after the start of sedimentation (see Figure 2.25). What is the diameter D of the smallest-size particles that have settled beyond the zone of measurement at that time (that is, t = 45 min)? Figure 2.25 ASTM 152H type of hydrometer placed inside the sedimentation cylinder (Courtesy of Khaled Sobhan, Florida Atlantic University, Boca Raton, Florida)A contactor has compacted the base course for a new road and found that the mean value of the test samples shows w = 14.6%, Gs = 2.81, y = 18.5 kN/m3 . The specifications require that void ratio (e) should be less that or equal to 0.80 e s0.80. Has the contractor complied to with the specifications?