Materials & Misc. Flashcards
Which of these materials has the least amount of embodied energy?
Rammed Earth, Concrete, Asphalt, Aggregate
Aggregate
Which of these materials has the Most amount of embodied energy?
Rammed Earth, Concrete, Asphalt, Aggregate
Asphalt
chapter 6 meg calkins
For paths on steep grades is better to use materials with low cohesiveness and durability (wood chips, gravel) or high cohesiveness and durability (Concrete or Asphalt)
High cohesiveness
Which is more cohesive / durable : Asphalt or Concrete
Concrete
Tensile strength of concrete paving (low or high)
Low tensile strength
Benefits of Concrete paving (4)
Low maintenance costs, high durability, hard surface, adaptability
High albedo paving materials do what to surface reflectance to sunlight
Increase surface reflectance
Soil porosity and drainage can be evaluated through which technique
Percolation test
Primary purpose of a slump test
Measure the workability of a concrete mix
What is a proctor test used for
To determine the level of compaction of an aggregate base
Three signage categories
Regulatory (e.g no parking)
Warning (e.g. steep slopes)
Guide (e.g. directional / display)
Zone is optional and is typically employed when road work is expected to generate significant traffic delays. As such, this zone can be located several miles away from the work zone and provide information to drivers via portable, dynamic messaging signs.
Advance information zone
This zone provides signage and information to advise drivers of the specific conditions that they will encounter, and includes:
Reduced speed limits
Directional signage
Construction activity notifications
Portable, dynamic messaging sign
Advance Warning Area
area is used to move traffic out of the normal lanes of travel and thus channels traffic to a desired path of travel, often with the road width tapering. Signage will provide drivers with specific instructions and includes:
Reduced speed limits
Directional signage
Notice of traffic control persons
Flashing arrow signs
Transition Area
Area used to provide protection for workers and to allow for traffic to recover an orderly flow following merging in the transition area. also introduces dividers to protect workers from traffic and therefore includes:
Barricades and barriers
Traffic attenuation devices (e.g., traffic cones)
Empty space and/or buffer vehicles
Buffer Space
area is where construction work actively takes place and typically includes:
Workers and equipment
All of the protective measures employed in the buffer zone
Work Area
area allows traffic to resume its normal flow and includes:
Work zone end signage
Resume speed signage
Traffic attenuation devices (e.g., traffic cones) to direct merging back into normal traffic lanes
Termination Area
