A four-lane urban express concrete pavement built on a 6 in. thick untreated sub-base with a robust modulus of 30,000 ps

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A four-lane urban express concrete pavement built on a 6 in.thick untreated sub-base with a robust modulus of 30,000 psi (206.8MPa) and a roadbed resilient modulus of 7,000 psi (48.3 MPa). Theroad is designed with a simple concrete surface, constructionjoints, and load transmission on the asphalt shoulder. The indicesof beginning and terminal serviceability are 4.2 and 2.5,respectively. Consider the average standard deviation. As a resultof 0.29 and the standard normal deviation, ZR is regarded as-1.645. The concrete working stress is 650 psi (4.5 MPa), and theelastic modulus is 5.0 x106 psi (34.5 GPa). The Equivalent StandardSingle Axle Load (ESAL) was calculated using Table Q1(c) (i). It isanticipated that the water removed from a foundation layer within 2hours, which pavement exposure to moisture is 30%.
1) Propose a suitable of concrete slab thickness
2)Analyse the relative damage of rigid pavement

A Four Lane Urban Express Concrete Pavement Built On A 6 In Thick Untreated Sub Base With A Robust Modulus Of 30 000 Ps 1 (49.61 KiB) Viewed 35 times

Vehicle Type Single units' trucks 2 axles (4 tires) 2 axles (6 tires) 3 axles or more Tractor semitrailers and combinations 4 axles or less 5 axles 6 axles or more Number of Vehicles 87,700 53,200 18,800 34,900 61,200 21,300 Truck Factor 0.003 0.25 0.86 0.92 1.25 1.54 Growth Factor 29.8 29.8 29.8 29.8 29.8 29.8
Loss of Support (LS) Type of Material Cement-treated granular base (E = 1,000,000 to 2,000,000 lb/in.²) Cement aggregate mixtures (E = 500,000 to 1,000,000 lb/in.) Asphalt-treated base (E = 350,000 to 1,000,000 lb/in.²) Bituminous stabilized mixtures (E = 40,000 to 300,000 lb/in.²) Lime-stabilized mixtures (E = 20,000 to 70,000 lb/in.²) Unbound granular materials (E = 15,000 to 45,000 lb/in.²) Fine-grained or natural subgrade materials (E = 3,000 to 40,000 lb/in.²) 0.0 to 1.0 0.0 to 1.0 0.0 to 1.0 0.0 to 1.0 1.0 to 3.0 1.0 to 3.0 2.0 to 3.0 Note: E in this table refers to the general symbol for elastic or resilient modulus of the material. SOURCE: Adapted from B.F. McCullough and Gary E. Elkins, CRC Pavement Design Manual, Austin Research Engi- neers, Inc., Austin, Tex., October 1979.
1,000,000 600,000 400,000 200,000 100,000 75,000 50,000 30,000 15,000 1000 2000 3000 5000 7000 10,000 12,000 16,000 20,000 18 Subbase Elastic Modulus, ESB (psi) Subbase Thickness, DSB (inches) 10 8 16 14 12 Roadbed Soil Resilient Modulus, Mg (psi) 6 :001: 50 (Turning Line) 400 300 Composite Modulus of Subgrade Reaction, 200 k (pci) (Assumes Semi- infinite Subgrade- Depth) L 500 2000. 1500 1000 800 600
0 10 20 30 40 50 60 70 80 90 100 T Match Läne Design Serviceability Loss, APSI Sim TT 9 99 3.0 NOTE: Application of reliability in this chart requires the use of mean values for all the input variables. Design Slab Thickness, D (inches) 1000 500 14 13 12 11 10 9 Estimated Total 18-kip Equivalent Single Axle Load (ESAL) Applications, W₁6 (millions) 16 100 50 99.9 10 5 2 1.0 5 A 56 Overall Standard Deviation, S 90 99 93 Reliability, R (%) 1 .05 80 TL 70 60 30