Pavement Design Lab Uncompacted Void Content of Fine Aggrega

Pavement Design

Lab (Uncompacted Void Content of Fine Aggregate)

(AASHTO T304)

1-What are the possible sources of errors in this experiment?

2-Does uncompacted voids percentage for the natural sand increases or decreases compared to the manufacturing sand? Explain.

3-What are the advantages of angular particles compared to the rounded particles considering asphalt concrete pavement performance? Explain.

Solution

Answer:-

(1) Answer:- Possible errors:- Errors during measurement of bulk mass density of aggregate.

Errors during measurement of mass of sample of fine aggregate

Errors during measurement of uncompacted air voids.

(2) Answer:- Natural fine aggregate decreases uncompacted air void percentages than manufacture sand.Becauses natural sand has round shape and smooth surface.

(3) Answer:- Angularity of aggregate increases strength of asphalt concrete pavement. Bonding strength increases in particle of fine aggregate. In asphalt pavement angular aggregate are very useful . They increases compressive strength of pavement. Angular pavement decreases deflection of pavement. Angular aggregate increases life time of pavement.