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Browse complete papersThe main function of lime in soil stabilization is to:
Increase plasticity
Reduce plasticity and improve workability
Increase water absorption
Decrease shear strength
Correct answer
Increase plasticity
Which roller is most effective for compacting cohesive soils?
Smooth wheel roller
Pneumatic roller
Sheep foot roller
Vibratory roller
Correct answer
Smooth wheel roller
For the same soil, permeability measured at 35°C will be higher than at 15°C mainly because:
Soil expands at higher temperature
Void ratio increases
Viscosity of water decreases
Adsorbed water disappears
Correct answer
Soil expands at higher temperature
A 2m wide strip footing rests on clay with c = 40kPa. Neglecting surcharge, ultimate bearing capacity is closest to:
(Terzaghi \( N_c = 5.7 \))
160kPa
200kPa
228kPa
300kPa
Correct answer
160kPa
In Mohr-Coulomb failure theory, shear strength depends on:
Only cohesion
Only normal stress
Cohesion and normal effective stress
Only pore water pressure
Correct answer
Only cohesion
If LL = 60%, PL = 30% and natural water content w = 45%, the consistency index is closest to:
0.25
0.50
0.75
1.00
Correct answer
0.25
If natural water content is greater than liquid limit, the liquidity index will be:
Negative
Zero
Between 0 and 1
Greater than 1
Correct answer
Negative
In a direct shear test, the major limitation is that:
Stress distribution is uniform
Failure plane is predetermined
Pore pressure is measured
Test is time-consuming
Correct answer
Stress distribution is uniform
According to Burmister's two-layer theory, the vertical displacement at the surface of a flexible pavement is dependent on the "settlement factor" (FW). If the ratio of \( \frac{E_1}{E_2} \) (pavement/subgrade modulus) increases, FW will:
Increase linearly
Decrease
Remain constant
Increase exponentially
Correct answer
Increase linearly
In Benkelman Beam deflection studies, the "Leg Correction" is required if:
The pavement is rigid.
The deflection bowl is large enough to affect the beam's front supports.
The temperature is above 35°C.
The subgrade is sandy.
Correct answer
The pavement is rigid.