Civil Engineering > STUDY GUIDE > California State University, Sacramento CIVIL ENGI 171A4 - Particle Size Analysis (All)

California State University, Sacramento CIVIL ENGI 171A4 - Particle Size Analysis

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Particle Size Analysis Particle size analysis are conducted to determine size range of soil particles as a percentage of total dry weight • Two methods: – Sieve analysis: for particle sizes > ... 0.075 mm – Hydrometer analysis: for particle sizes < 0.075 mm • Particle size distribution curve • Estimate size parameters Sieves: • Sieves are woven wires with square openings • Sieves are generally 203 mm (or 8 in ) in diameter • Sieves are numbered according to opening size • The larger the sieve number, the smaller the opening size • No. 200 is the smallest opening used for sieve analysis • See table 2.5 for U.S. Standard Sieve Sizes Sieve Analysis Sieve analysis is shaking of soil samples through a stack of sieves with openings of decreasing size from top to bottom, and with a pan placed below the stack • Good for soils that are mostly granular • Need to oven-dry the soil • It is critical to break all lumps into small, individual particles • May need to use washing method for cohesive soils A Stake of Sieves Text: Figure 2.26 Calculation for Sieve Analysis After shaking, need to determine: • Mass of soil retained on each sieve (M1, M2, …, Mi, …Mn) • Total mass: p • Effective for soil particl [Show More]

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