Question 1 |
Consider the Marshall method of mix design for bituminous mix. With the increase in bitumen content, which of the following statements is/are TRUE?
the Stability decreases initially and then increases | |
the Flow increases monotonically | |
the air voids (VA) increases initially and then decreases | |
the voids filled with bitumen (VFB) increases monotonically |
Question 1 Explanation:
For marshall mix design, following graphical results are obtained.
\Rightarrow Stability increases initially and then decreases
Hence option (A) is INCORRECT
\Rightarrow Flow increases monotonically
Hence option (B) is CORRECT
\Rightarrow Air voids decreases continously
Hence option (C) is INCORRECT
\Rightarrow VFB increases monotonically
Hence option (D) is CORRECT
\Rightarrow Stability increases initially and then decreases
Hence option (A) is INCORRECT
\Rightarrow Flow increases monotonically
Hence option (B) is CORRECT
\Rightarrow Air voids decreases continously
Hence option (C) is INCORRECT
\Rightarrow VFB increases monotonically
Hence option (D) is CORRECT
Question 2 |
The softening point of bitumen has the same unit as that of
distance | |
temperature | |
time | |
viscosity |
Question 2 Explanation:
Softening point is the temperature at which bitumen becomes soft and starts flowing.
Question 3 |
Group-I gives a list of test methods for evaluating properties of aggregates. Group-II
gives the list of properties to be evaluated.
The correct match of test methods under Group-I to properties under Group-II, is
The correct match of test methods under Group-I to properties under Group-II, is
P-4, Q-1, R-2, S-3 | |
P-2, Q-1, R-4, S-3 | |
P-3, Q-4, R-1, S-2 | |
P-2, Q-4, R-3, S-1 |
Question 3 Explanation:
Soundness test is done to evaluate
resistance against weathering of aggregate.
Crushing test is done to evaluate strength of aggregate.
Los angles abrasion test is to evaluate hardness of aggregate.
Stripping value test is to evaluate ratio of uncovered area observed to the total area of aggregate. The test is conducted to determine the effects of moisture upon the adhesion of binding material.
Crushing test is done to evaluate strength of aggregate.
Los angles abrasion test is to evaluate hardness of aggregate.
Stripping value test is to evaluate ratio of uncovered area observed to the total area of aggregate. The test is conducted to determine the effects of moisture upon the adhesion of binding material.
Question 4 |
The Los Angeles test for stone aggregates is used to examine
abrasion resistance | |
crushing strength | |
soundness | |
specific gravity |
Question 4 Explanation:
Los Angles abrasion test is carried out to
examine the hardness i.e., abrasion resistance
property of aggregate
Question 5 |
Structural failures considered in the mechanistic method of bituminous pavement design are
Fatigue and Rutting | |
Fatigue and Shear | |
Rutting and Shear | |
Shear and Slippage |
There are 5 questions to complete.