Geotechnical Lab G1: Standard Proctor Test Procedure

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What is the purpose of adding 4% water to the dry soil sample in the Standard Proctor Test?

To soften the soil particles

In the modified test, how many layers is the soil placed in the mould?

Five layers

What is the purpose of applying 25 blows evenly on the surface using a 4.5kg hammer in the modified test?

To compact the soil

What happens to the dry density with the addition of water in the Standard Proctor Test?

Increases until it reaches OMC, then decreases

What does OMC stand for in the context of the Standard Proctor Test?

Optimum Moisture Content

What is the purpose of taking soil samples from the top and bottom of the mould in the Standard Proctor Test?

To check for uniformity of compaction

What is the formula for relative compaction?


Which method is preferred for determining the field density of soil?

Core cutter method

What is the maximum dry density (MDD) obtained from the StrucX website?

2179 kg/m3

What does the permeability test help in estimating?

Seepage quantity under hydraulic conditions

What does Darcy law express?

Velocity in terms of hydraulic pressure gradient

What does Reynolds number (Rn) represent?

Ratio of inertia force to viscous force

What is the influence of relative roughness on the friction factor (f)?

Decreases with relative roughness

What increases as water power increases in a Pelton impulse turbine?


Learn the detailed step-by-step procedure for conducting a standard Proctor test in geotechnical engineering, including measuring mould dimensions, taking readings, determining moisture content, compacting soil samples, and calculating water content. Practice and test your understanding of the test method with this quiz.

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