Towards Standardizing Construction Specifications and Design Criteria of Agricultural Roads in the GCC Countries

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Towards Standardizing Construction Specifications
and Design Criteria of Agricultural Roads in the
GCC Countries
Eng. Abdulaziz Al-Kulaib Undersecretary,
Ministry of Public Works, Kuwait Eng. Fadel
Al-Ajmi Assistant Undersecretary, Maintenance
Division, Ministry of Public Works, Kuwait Dr.
Sayed Metwali Advisor, Maintenance
Division, Ministry of Public Works, Kuwait Dr.
Ahmad H. Aljassar Associate Professor, Civil
Engineering Department, Kuwait University Fourth
International Gulf Conference on Roads 10-13
November 2008, Doha, Qatar
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Introduction

• ARs to serve farming areas.
• Simplified design because of low traffic
  volumes.
• One main concern to minimize cost.
• MPW has been constructing ARs for many years in
  North and South of Kuwait.

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Introduction

• In the past light traffic consisting of light
  pickup trucks and occasional heavy trucks.
• Therefore, did not require thick pavements.
• Used to be 50 mm of wearing course on top of 150
  mm of prepared subgrade.

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Introduction

• Rapid developments of farming areas in recent
  years resulted in heavier daily traffic (heavy
  trucks).
• This led to rapid deterioration of pavements.
• Need for stronger pavements was recognized.

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Introduction

• In recent years, MPW tendered 6 contracts for
  construction and maintenance of AR in the
  Northern and Southern farming areas (total value
  12 million KD 150 million QAR).
• Cost of AR 30,000 KD (390,000 QAR) per km.

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Cross section
AASHTO recommends 3.6 m
Cross slope to facilitate drainage
Typical cross section of an AR
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Cross section
Graded and compacted earth shoulders
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Cross section
Sunken cast in-situ concrete curb to provide
lateral support and protect pavement edge
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Road profile

• Follows the natural flat terrain in farming
  areas.
• Aesthetically pleasing, reduced construction
  costs, and improved safety.

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Road profile
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Drainage

• Surface runoff is drained over the crowned
  pavement, then down the side slopes.
• During winter season, vegetation grows along
  side slopes. This helps protect them against
  erosion.

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Construction

• Subgrade soil is A-2-4 or better.
• Dry density 1922 kg/m3 min.
• CBR of 15 min.
• Subgrade thickness is 30 cm min., compated in
  two layers (each not more than 15 cm).

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Construction
Clearing leveling
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Construction
20 cm x 20 cm edge sunken curb
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Construction
Subgrade
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Construction
Subgrade
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Construction
Subgrade
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Construction
4 5 cm bituminous wearing course 8 10 cm
bituminous base course
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Construction
4 5 cm bituminous wearing course 8 10 cm
bituminous base course
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Material properties (aggregates)
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Material properties (bituminous mixes)
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Material properties

• Prime coat
• - Medium-curing cut back (MC-70).
• - Application rate 0.45 1.50 kg/m2.
• - Application temperature 60o 80o C.
• - Not allowed if ambient temp. lt 13o C.
• - Not allowed in presence of surface free water.

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Material properties

• Tack coat
• - Slow-setting emulsion.
• - Application rate 0.15 0.75 kg/m2.
• - Application temperature 10o 60o C.
• - Not allowed if ambient temp. lt 13o C.

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Conclusion

• ARs are becoming an important element of the
  highway system.
• They provide farmers with all-weather access to
  markets.
• Traditional thin pavement design is becoming
  insufficient to sustain heavier traffic loads on
  ARs.
• Properties and design features may be of benefit
  for similar applications in the GCC.

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jassar_at_kuniv.edu.kw
Copy of this presentation available at
www.draljassar.net