# Highway Materials

 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?
 A the Stability decreases initially and then increases B the Flow increases monotonically C the air voids (VA) increases initially and then decreases D the voids filled with bitumen (VFB) increases monotonically
GATE CE 2023 SET-2   Transportation Engineering
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

 Question 2
The softening point of bitumen has the same unit as that of
 A distance B temperature C time D viscosity
GATE CE 2021 SET-2   Transportation Engineering
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
 A P-4, Q-1, R-2, S-3 B P-2, Q-1, R-4, S-3 C P-3, Q-4, R-1, S-2 D P-2, Q-4, R-3, S-1
GATE CE 2020 SET-2   Transportation Engineering
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.
 Question 4
The Los Angeles test for stone aggregates is used to examine
 A abrasion resistance B crushing strength C soundness D specific gravity
GATE CE 2020 SET-1   Transportation Engineering
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
 A Fatigue and Rutting B Fatigue and Shear C Rutting and Shear D Shear and Slippage
GATE CE 2019 SET-2   Transportation Engineering

There are 5 questions to complete.