Presentation on theme: "Towards Standardizing Construction Specifications and Design Criteria of Agricultural Roads in the GCC Countries Eng. Abdulaziz Al-Kulaib Undersecretary,"— Presentation transcript:
1Towards Standardizing Construction Specifications and Design Criteria of Agricultural Roads in the GCC CountriesEng. Abdulaziz Al-KulaibUndersecretary,Ministry of Public Works, KuwaitEng. Fadel Al-AjmiAssistant Undersecretary, Maintenance Division,Dr. Sayed MetwaliAdvisor, Maintenance Division,Dr. Ahmad H. AljassarAssociate Professor, Civil Engineering Department, Kuwait UniversityFourth International Gulf Conference on Roads10-13 November 2008, Doha, Qatar
2Introduction 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.
5IntroductionIn 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.
6IntroductionRapid 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.
7IntroductionIn 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.
8Typical cross section of an AR AASHTO recommends 3.6 mCross slope to facilitate drainageTypical cross section of an AR
9Cross sectionGraded and compacted earth shoulders
10Cross sectionSunken cast in-situ concrete curb to provide lateral support and protect pavement edge
11Road profile Follows the natural flat terrain in farming areas. Aesthetically pleasing, reduced construction costs, and improved safety.
20Construction 4 – 5 cm bituminous wearing course 8 – 10 cm bituminous base course
21Construction 4 – 5 cm bituminous wearing course 8 – 10 cm bituminous base course
22Material properties (aggregates) Material TypeSizeMaterial DescriptionMain PropertiesFine AggregatePassing # 8 sieveNatural Sand and crushed sandSand equivalent: 30 min. for crushed sand 45 min. for natural sand - soundness loss: 15% max. (AASHTO T-104)Coarse AggregateRetained on # 8 sieveCrushed natural stone and gravelCubic in shape.Degree of crushing 80% min.Has at least one fractured face.Flakiness: 30% max. (BS 812).Soft and friable particles: 3% max. for base course, 2% max. for binder and surface courses.Sodium sulfate soundness loss: 12% max.Abrasion loss: 40% max for surface course, 50% max for base and binder courses (AASHTO T-96).Mineral Filler100% passing #30Min. 75% passing #200Limestone, cement, or hydrated limeFree Moisture 30% max.Lime Index: 50% min.Unhydrated lime: 9% max.Carbon Dioxide: 8% max.
23Material properties (bituminous mixes) Sieve% passing by weightAcceptabletolerancesBase courseSurface course1 1/2"100-± 5%1"3/4"1/2"46 – 7666-953/8"54 – 88# 437 – 70# 822 – 4326 – 52± 4 %# 1615 – 3618 – 40# 3010 – 2813 – 30# 506 – 228 – 23# 1004 – 146 – 16# 2002 – 84 – 10Bitumen (60/70) % by weight of total aggregate3.5 – 54.5 – 6.5± 0.4 %Marshall Stability1600 kg min.1800 kg min.Index of Retained Strength (AASHTO T-165),ORNet Retained Strength90% min.14 kg/cm2 min.
24Material 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. < 13o C.- Not allowed in presence of surface free water.
25Material properties Tack coat: - Slow-setting emulsion. - Application rate 0.15 – 0.75 kg/m2.- Application temperature 10o – 60o C.- Not allowed if ambient temp. < 13o C.
26ConclusionARs 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.
27وصلى الله وسلم وبارك على عبده ورسوله محمد . . والحمد لله رب العالمين . .Copy of this presentation available at