General Pavements Flashcards
What is the criteria that determines the design vehicle?
The design vehicle is the vehicle that exerts the greatest load on the pavement, not the most common vehicle that uses it.
What is a culvert?
A channel that directs water under a road or railway
What is aquaplaning?
When there is water sitting on the surface of a pavement and tires of a vehicle lose traction.
What is rutting?
When there is permanent deformation in a flexible pavement along the length of the pavement caused by the vehicle wheel path.
What is another term for high speed skid resistance?
Macro-texture and is classified as the distance between aggregates on the pavement surface.
What’s is another term for low speed skid resistance?
Micro-texture and is classified as the roughness of the aggregate on the pavement surface.
What is the roughness of a road and why is it important?
Roughness is how bumpy it is to drive on the pavement, it is important because a rough road will wear out vehicle suspension quicker and there is the possibility of trailers to become loose and unlatched. It is also more unpleasant for drivers to drive on.
What is the meaning of a pavement’s abrasion?
It is a pavement’s ability to resist chemical damage
What is the difference between a concrete block pavement and a concrete pavement?
Concrete block pavements are made up of concrete blocks about the size of a brick with grass between blocks. That can be easily placed and removed by hand. A concrete pavement is made up of large concrete slabs that need to be broken when removed.
What is the definition of pavement adaptability?
The pavement must be designed in such a way that it can accomodate future changes that may occur.
How can you incorporate safety in design when designing pavements?
Pavements should be designed to minimise the exposure of workers during maintenance and operation.
What are the three things you can do to subgrade?
Cut, fill or existing/leave as is
How can you express the strength of a subgrade?
CBR - California Bearing Ratio for flexible pavements
Modulus of subgrade reaction (kPa/mm) for some rigid pavements
What is the methodology of a Scala Penetrometer Test?
- Long rod with a sharp tip and a weight at the other end
- the weight is dropped to drive the rod into the ground
- the number of blows to reach a certain depth is used to find CBR
What are the three things that determine the quality of the pavement?
The technical level of service (performance of the pavement in certain physical parameters), the client’s input/expectations and the level of service determined by the client
