Podcast
Questions and Answers
The tack coat in a flexible pavement system is applied at a rate of 0.50 to 0.75 liter/m2 for new pavement.
The tack coat in a flexible pavement system is applied at a rate of 0.50 to 0.75 liter/m2 for new pavement.
False (B)
Semi Rigid Pavements with ATB include an unbound sub-base layer.
Semi Rigid Pavements with ATB include an unbound sub-base layer.
True (A)
Jointed Reinforced Concrete Pavement (JRCP) typically has continuous longitudinal reinforcement.
Jointed Reinforced Concrete Pavement (JRCP) typically has continuous longitudinal reinforcement.
False (B)
Inverted section composite pavements include an unbound base layer.
Inverted section composite pavements include an unbound base layer.
Flexible pavements in the U.S. make up more than 90% of all paved roads.
Flexible pavements in the U.S. make up more than 90% of all paved roads.
Rigid pavements typically include tie bars to prevent cracks.
Rigid pavements typically include tie bars to prevent cracks.
Flexible pavements typically have a binder course made of coarse asphalt mix.
Flexible pavements typically have a binder course made of coarse asphalt mix.
Rigid pavements always include a subbase course made of sandy or sandy gravel soils.
Rigid pavements always include a subbase course made of sandy or sandy gravel soils.
Flexible pavements have a base course that is 4 to 12 inches thick.
Flexible pavements have a base course that is 4 to 12 inches thick.
Rigid pavements typically have a surface course of fine asphalt mix.
Rigid pavements typically have a surface course of fine asphalt mix.
Semi Rigid Pavements with ATB always include an asphalt concrete layer as the surface course.
Semi Rigid Pavements with ATB always include an asphalt concrete layer as the surface course.
Flexible pavements resist distortion under traffic loading but do not provide smoothness, friction, and drainage on the surface.
Flexible pavements resist distortion under traffic loading but do not provide smoothness, friction, and drainage on the surface.
Rigid pavements have tie bars to distribute load to the base course.
Rigid pavements have tie bars to distribute load to the base course.
Jointed Reinforced Concrete Pavement (JRCP) typically has a longitudinal joint with tie bars.
Jointed Reinforced Concrete Pavement (JRCP) typically has a longitudinal joint with tie bars.
Composite Pavements Type 1 include existing rigid pavement as the base course.
Composite Pavements Type 1 include existing rigid pavement as the base course.
Flexible pavements always have a tack coat applied at a rate of 0.10 to 0.20 liter/m2 for new pavement.
Flexible pavements always have a tack coat applied at a rate of 0.10 to 0.20 liter/m2 for new pavement.
Study Notes
Flexible Pavements
- Applied tack coat rate for new pavement: 0.50 to 0.75 liter/m2
- Typical binder course: coarse asphalt mix
- Base course thickness: 4 to 12 inches
- Resist distortion under traffic loading, but don't provide smoothness, friction, and drainage on the surface
Rigid Pavements
- Typically include tie bars to prevent cracks and distribute load to the base course
- Subbase course made of sandy or sandy gravel soils
- Surface course: fine asphalt mix
Semi Rigid Pavements with ATB
- Include an unbound sub-base layer
- Always include an asphalt concrete layer as the surface course
Jointed Reinforced Concrete Pavement (JRCP)
- Typically has continuous longitudinal reinforcement
- Typically has a longitudinal joint with tie bars
Composite Pavements
- Type 1 includes existing rigid pavement as the base course
- Inverted section composite pavements include an unbound base layer
General Pavement Facts
- Flexible pavements make up more than 90% of all paved roads in the U.S.
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Description
Explore the different types of pavement systems such as flexible, rigid, semi rigid, and composite pavements. Learn about the typical cross sections and characteristics of flexible pavements, including the layers from the surface course to the uncompacted subgrade.
