| 1. |
CRCP stands for: |
|
|
Continuously reinforced concrete pavement |
|
|
Concrete resistance cause of pavement |
| 2. |
CRCP contains continuous, longitudinal steel reinforcement without transverse joints, except where required for end-of-day header joints, at bridge approaches, and at transitions to other pavement structures. |
|
|
True |
|
|
False |
| 3. |
Continuous reinforcement is a strategy for managing the transverse cracking that occurs in all new concrete pavements. |
|
|
True |
|
|
False |
| 4. |
In new concrete pavements, volumetric changes caused by cement hydration, thermal effects, and external drying are restrained by the pavement base layer and _______________ causing tensile stresses to develop in the concrete. |
|
|
Longitudinal reinforcement |
|
|
Transverse reinforcement |
| 5. |
These stresses, referred to as restraint stresses, increase more rapidly than the strength of the concrete at early ages of the concrete pavement, so, at some point, full-depth transverse cracks form, ________________________, individual slabs. |
|
|
Dividing the pavement into short |
|
|
Improving the strength of the |
| 6. |
In CRCP, the continuous reinforcement results in _________ and produces transverse cracks that are closely spaced with small crack widths that help to maximize the aggregate interlock between adjacent CRCP panels. |
|
|
Internal restraint |
|
|
Fatigue in concrete |
| 7. |
This feature is different from jointed plain concrete pavements (JPCP), where the number and location of ____________ are typically managed by timely sawing. |
|
|
Longitudinal cracks |
|
|
Transverse cracks |
| 8. |
In CRCP, the shorter panel sizes and high load transfer between adjacent CRCP panels __________________ from traffic loads and temperature and moisture curling. |
|
|
Increase the flexural (bending) stresses |
|
|
Reduce the flexural (bending) stresses |
| 9. |
Which one of the following CRCP achieves: |
|
|
Eliminate joint-maintenance costs for the life of the pavement, helping meet the public’s desire for reduced work zones and related travel delays. |
|
|
Provide long-term, high load transfer across the transverse cracks, resulting in a consistently smooth and quiet ride with less distress development at the cracks than jointed pavements. |
|
|
All of the above |
| 10. |
Drying Shrinkage – Volumetric contraction of the concrete is a function of a number of factors including the water-cementitious materials ratio, cementitious materials type and content, admixtures used, type and amount of aggregates, and climatic and curing conditions. The total shrinkage should be kept as low as possible to ______________________ in the CRCP that can lead to widely spaced transvers |
|
|
Minimize volumetric changes |
|
|
Maximize volumetric changes |
| 11. |
Cement-Treated Base (CTB). A CTB consists of crushed aggregate base material and/or granular soils commonly mixed through a pugmill with an optimized quantity of cement (e.g., 5 percent) to achieve a 7-day unconfined compressive strength of 500 psi (3.5 MPa), and a water content at 1 to 2 percent below the optimum moisture. CTB layers are primarily constructed with an asphalt paver or aggregate spreader followed by rolling to meet density requirements. The CTB is expected to be _______________ and not have any man-made contraction joints. |
|
|
strong and erosion-resistant |
|
|
flexible and malleable |
| 12. |
Lean Concrete Base (LCB). Lean concrete, also known as "econocrete," is made of aggregates that have been plant-mixed with a sufficient quantity of cement and water to achieve a higher strength and paving quality than CTB materials. |
|
|
higher strength and paving quality |
|
|
lower strength but more flexibility |
| 13. |
Permeable Base. The primary function of a permeable base layer _________ infiltrating the pavement and move it to edge drains or daylight it within an acceptable time frame. |
|
|
Is to collect water |
|
|
Is not to collect water |
| 14. |
In figure 44- Wooden panels are temporary placed to: |
|
|
Facilitate removal of concrete carried over end-of-day header. |
|
|
To measure extra concrete used that day. |
| 15. |
In Figure 62 the fresh concrete is probed to check: |
|
|
The depth of longitude steel |
|
|
The density of the new concrete |
|
