This set of Highway Engineering Multiple Choice Questions & Answers (MCQs) focuses on ” Soil-Lime Stabilization”.
1. The non desirable property of soil after addition of lime is __________
a) High affinity with water
b) Friability
c) Pulverisation
d) Reduction in plasticity
View Answer
Explanation: The soil should show less affinity towards the water, and all other changes are desirable.
2. The maximum dry density of soil lime mix is decreased by __________
a) 1 to 1.5%
b) 2 to 2.5%
c) 2 to 3%
d) 4 to 5%
View Answer
Explanation: The maximum dry density decrease by 2 to 3%, but it doesn’t effect its strength in any manner.
3. The structure of clay is __________
a) Flocculated
b) Dispersed
c) Elongated
d) Flaky
View Answer
Explanation: The structure of clay is formed in flocks and when they react, a flocculated structure is formed.
4. The flocculated substances are __________
a) Stable
b) Unstable
c) Neutral
d) Depends on soil
View Answer
Explanation: The flocculated substances are very stable, and they even remain stable under subsequent soaking.
5. The factor on which the property of soil lime doesn’t depend is __________
a) Soil
b) Lime
c) Shear
d) Curing
View Answer
Explanation: The soil lime doesn’t depend on the shear, as it is a property of soil it can’t change the stability.
6. The increase in soil strength depends on __________
a) Clay fraction
b) Thixotropy
c) Activity
d) Shear
View Answer
Explanation: The clay fraction content in soil affect the physical and other properties such as base exchange and pozzolanic action.
7. The point at which plastic limit increase and then decrease is __________
a) Lime point
b) Fixing point
c) Lime fixation point
d) Lime reducing point
View Answer
Explanation: The plastic limit in lime stabilized soils, increase up to a certain point and then decrease, it is termed as lime fixation point.
8. The chemical which causes burns while working with is __________
a) Quick lime
b) Hydrated lime
c) Quick cement
d) Sulphate resistant cement
View Answer
Explanation: The quick lime is very effective in stabilisation, but it causes burns, so hydrated lime is preferred.
9. The compaction is carried out at __________
a) 6% Water content
b) OMC
c) MDD
d) Saturated density
View Answer
Explanation: The strength is a very important factor considered in the soil lime stabilisation, so it is compacted at OMC to achieve MDD.
10. The strength of soil lime for several years after curing __________
a) Increases
b) Decreases
c) Remains constant
d) Can’t say
View Answer
Explanation: The lime soil strength increases with an increase in curing period unless and until effected by external sources its strength increases.
11. The substance added with lime for extra strength are called __________
a) Fertiliser
b) Additive
c) Plasticiser
d) Super plasticiser
View Answer
Explanation: The strength of lime alone is not enough for the stabilisation, so special substances called additives are added.
12. The design of soil lime mix is based on __________
a) BIS
b) PAC
c) ASTM
d) Lime fixation point
View Answer
Explanation: The design of lime soil mix is based on lime fixation point, as it has no specific method for design.
13. What is the first step in the construction step of soil lime base course is?
a) Preparation of sub grade
b) Preparation of pulverised soil
c) Field tests
d) Pre conditioning
View Answer
Explanation: The first step after design of the mix is preparation of the sub grade followed by pulverising.
14. The lime soil can’t be used in __________
a) Sub base
b) Base
c) Surface
d) Sub grade
View Answer
Explanation: The lime soil is very weak and cannot be used in the surface course, it can only be used in light traffic areas.
15. Increase in lime content results in __________
a) Decrease in plastic limit
b) Decrease in plasticity index
c) Increase in plasticity index
d) Change in volume
View Answer
Explanation: The increase in lime content will cause a slight change in the plastic limit, increasing the plastic limit and decrease of plasticity index.
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