Virtual Labs

Elongation Index of the Coarse Aggregate

Higher value of elongation index can be achieved by which of the following type of aggregates?

a: Rounded Explanation

Explanation

b: Properly shaped corners Explanation

Explanation

c: Flat and elongated particles Explanation

Explanation

d: None of the above Explanation

Explanation

Elongation index test is used to assess the suitability mainly of ______

a: Asphalt Explanation

Explanation

b: Steel Explanation

Explanation

c: Bricks Explanation

Explanation

d: None of the above Explanation

Explanation

What is the recommended maximum elongation index for aggregates used in asphalt concrete

a: 5% Explanation

Explanation

b: 10% Explanation

Explanation

c: 20% Explanation

Explanation

d: 25% Explanation

Explanation

Which of the following statement is correct

a: Higher elongation index indicates better quality of aggregates Explanation

Explanation

b: Lower elongation index indicates better quality of aggregates Explanation

Explanation

c: Elongation index does not define the quality of aggregates. Explanation

Explanation

d: None of the above Explanation

Explanation

An aggregate sample has an elongation index of 15%. If the weight of particles retained on the 25 mm sieve is 225g, calculate the weight of aggregates passing through the sieve

a: 1130 g Explanation

Explanation

b: 700 g Explanation

Explanation

c: 500 g Explanation

Explanation

d: 900 g Explanation

Explanation

The total weight of aggregate sample is 1850 g and the weight of the aggregates passing through the 25 mm sieve is found to be 1200 g. Calculate the elongation index of the sample

a: 25% Explanation

Explanation

b: 35% Explanation

Explanation

c: 15% Explanation

Explanation

d: 10% Explanation

Explanation

Elongation index of aggregates is defined as the percentage by weight of particles whose length is greater than which of the following?

a: 1.8 times their mean dimension Explanation

Explanation

b: 2.5 times their mean dimension Explanation

Explanation

c: 1.5 times their mean dimension Explanation

Explanation

d: 2.0 times their mean dimension Explanation

Explanation

If an aggregate sample has a total weight of 500 g and the weight of elongated particles is 75 g, what is the elongation index?

a: 10% Explanation

Explanation

b: 15% Explanation

Explanation

c: 20% Explanation

Explanation

d: 25% Explanation

Explanation

Which sieve is typically used for the elongation index test to separate elongated particles from the aggregate sample?

a: 10 mm sieve Explanation

Explanation

b: 25 mm sieve Explanation

Explanation

c: 50 mm sieve Explanation

Explanation

d: 75 mm sieve Explanation

Explanation

An aggregate sample of 2000 g contains elongated particles weighing 320 g. If the elongation index requirement for high-quality aggregates is a maximum of 20%, does this sample meet the requirement?

a: Yes, the elongation index is 16% which is within the limit Explanation

Explanation

b: No, the elongation index is 32% which exceeds the limit Explanation

Explanation

c: Yes, the elongation index is 20% which matches exactly Explanation

Explanation

d: No, the elongation index is 24% which exceeds the limit Explanation

Explanation