3.grain size analysis of soil
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This document presents a grain size analysis of soil using sieve analysis and hydrometer analysis. It provides objectives, test standards, procedures and observations for both methods. For hydrometer analysis, it explains Stokes' Law which relates particle size to velocity of fall. Tables are shown for calibration, corrections, and calculating particle size from hydrometer readings using the law. A grain size distribution curve is presented to show results.
3.grain size analysis of soil
- 1. WELCOME TO OUR PRESENTATION Submitted To Dr. Md. Abu Taiyab Prof. Dept. Of CE. Mr. Md . Ariful Islam Lecturer, Dept. of CE. Prepared By MD. Parvej ID: 131046 CE- 3/2 SEC A DEPARTMENT OF CIVIL ENGINEERING. DHAKA UNIVERSITY OF ENGINEERING & TECHNOLOGY ,GAZIPUR.
- 2. Grain size analysis of soil COURSE NO. CE -3302 GEOTECHNINICAL ENGINEERING -I SESSIONAL
- 3. Objectives To determine the grain size distribution Test Standard ASTM D 421 Applicable for most granular soil analysis (Sieve analysis) ASTM D 422 Applicable for soils with small grain size< .075mm
- 7. Hydrometer Analysis The hydrometer analysis is based on Stokes Law, which gives the relationship among the velocity of fall of spheres in a fluid, the diameter of the sphere, the specific weights of the sphere and of the fluid, and the fluid viscosity. In equation form this relationship is where, v = velocity of fall of the spheres (cm/s) Gs = specific gravity of the sphere Gf = specific gravity of fluid (varies with temperature) = absolute, or dynamic, viscosity of the fluid (g /(cm * s)) D = diameter of the sphere (cm) 2 (Gs Gf ) v = ---- * ------------ * (D / 2)2 9
- 8. Solving the equation for D and using the specific gravity ofwater Gw, we obtain ________________ D = 18 v/ ( Gs Gw) v = L / t _______________ A = 18 / (Gs Gw) ________________ D = A L (cm) / t (min) where 0.002 mm < D < 0.2 mm Fig.12 Hydrometer and its Activities K K CONTD:
- 10. 1. CALIBRATION OF THE HYDROMETER
- 11. Fig: Hydrometer Calibration Chart Hydrometer Calibration Chart
- 12. Corrections to hydrometer readings
- 13. Some Tables for Calculation
- 14. Some Tables for Calculation
- 15. Some Tables for Calculation
- 17. Grain size distribution curve
- 18. & DO YOU HAVE ANY QUESTION???? THANK YOU
- 25. Sl. No. OBSERVATIONS CALCULATIONS Elaspsed time Hydrometer reading Temperature Composite correction Corrected reading Rh=Rh+Cm Height (cm) He Reading R= Rh+C Factor M Particle size D % Finer 1 15 sec 25 27 2 1/2min 24.5 3 1 24 4 2 21.5 5 4 20.1 6 8 17.5 7 15 16.1 8 30 15.1 9 1 hr 14.5 12 24 hr 11.2
- 30. Solving the equation for D and using the specific gravity of w ________________ D = 18 v / ( Gs Gw) v = L / t _______________ K = 18 / ( Gs Gw) where 0.002 mm < D < 0.2 mm