Date post: | 23-Dec-2015 |
Category: |
Documents |
Upload: | stewart-allen |
View: | 215 times |
Download: | 2 times |
CONCRETE INDUSTRY MANAGEMENT TECHNOLOGY
I. Advantages of Smooth Pavements:• Longer Life• Public Opinion• Save Fuel• Less Surface Maintenance
II. Ways to Ensure Smooth Pavements• Subgrade and Subbase• Survey• Equipment and Operators• Mix Design • Road Design• Embedded Items
Smooth Pavements/Surface Textures CIMT 210
CONCRETE INDUSTRY MANAGEMENT TECHNOLOGY
…continued
III. Smooth Criteria• California Profilograph
IV. Surface Texture• Drag Textures• Tine Textures
Smooth Pavements/Surface Textures CIMT 210
CONCRETE INDUSTRY MANAGEMENT TECHNOLOGY
Advantages of Smooth Pavement•Longer Life
A National Cooperative Highway Research Program analysis showed that improved smoothness extends pavement performance life up to 50%
•Public OpinionNational Survey stated that the public that the road condition was a high priority
•Save Fuel Smoother roads also increase fuel efficiency and decrease vehicle wear
•Less Surface Maintenance Smoother pavements lead to long term performance and less maintenance
CONCRETE INDUSTRY MANAGEMENT TECHNOLOGY
Ways to Ensure Smooth Pavements
•Subgrade and Subbase•It is critical that base and subbase be as true to grade as possible. Automated fine- grading equipment can achieve this
•Equipment and Operators – •Operators need a sense of ownership for their work•Pavers should be well maintained and should not stop often or not push too much concrete
•Survey •For slipform paving , the contractor must pay close attention to the position and maintenance of the stringline•Stringline should be checked periodically in order to result in smooth surface.
CONCRETE INDUSTRY MANAGEMENT TECHNOLOGY
Ways to Ensure Smooth Pavements
•Survey
CONCRETE INDUSTRY MANAGEMENT TECHNOLOGY
Ways to Ensure Smooth Pavements
•Survey
CONCRETE INDUSTRY MANAGEMENT TECHNOLOGY
Ways to Ensure Smooth Pavements
•Equipment and Operators
CONCRETE INDUSTRY MANAGEMENT TECHNOLOGY
Ways to Ensure Smooth Pavements
•Mix Design•Achieving an accurate and consistent slump and mixture consistency•QC during hauling, placing, and finishing is needed
•Road Design•It may be more difficult to construct a smooth pavement on grades exceeding 3% versus flatter grades.•For steep slopes the contractor should lower the slump of concrete
•Embedded Items•Continuous reinforcing steel, mesh reinforcement, and dowel baskets all may disrupt the consolidation pressure during the passage of the slipform paver.
CONCRETE INDUSTRY MANAGEMENT TECHNOLOGY
Ways to Ensure Smooth Pavements
•Embedded Items (con’t)
•Continuous reinforcing steel, mesh reinforcement, and dowel baskets all may disrupt the consolidation pressure during the passage of the slipform paver.
•Damming occurs when a basket assembly or transverse steel acts to dam up the concrete on the grade.
•Reinforcement ripple occurs when either longitudinal or transverse reinforcing steel prevents concrete from being distributed evenly under and over the steel
CONCRETE INDUSTRY MANAGEMENT TECHNOLOGY
Smooth Criteria•California Profilograph
The profilograph is the most common equipment currently used to measure smoothness of new PCC pavement for construction acceptance
The trace obtained from the profilograph is used to compute the Profile Index (PI) of the pavement
CONCRETE INDUSTRY MANAGEMENT TECHNOLOGY
Smooth Criteria•Inertial Profiler
The more recently developed inertial profiler quickly monitors in-service pavements, and produces a profile from which the International Roughness Index (IRI) can be computed
CONCRETE INDUSTRY MANAGEMENT TECHNOLOGY
Surface Texture•Drag Texture
CONCRETE INDUSTRY MANAGEMENT TECHNOLOGY
Surface Texture•Tine Texture
CONCRETE INDUSTRY MANAGEMENT TECHNOLOGY
Basic Components of Concrete Pavement