Design a  Two-Lane Two-Way Bypass for a Rural Town - Engineering Assignment Help

Assignment Task :

In this project, your company has been contracted by the Department of Transport to design a  two-lane two-way bypass for a rural town. Your task in this project is to cover road pavement  design for the bypass. The pavement design must comply with Austroads Guide to Pavement  Technology. 

You will need to provide six pavement design options for the bypass, including four options of  an unbound pavement with thin bituminous surfacing and two options of an asphalt pavement. 

The pavement structure is to be constructed for a design life of 20 years. Current AADT (in  2019) is 4500. The bypass is scheduled to open in 2021. Project reliability is 95%. The traffic  load distribution (TLD) is provided in the Pavement Design Data Excel file on LMS.  Depending on your student ID, the following parameters must be used: 

• If the last four digits of your student ID < 3000: Heavy vehicles = 9%, annual vehicle  growth rate = 4%, and Subgrade CBR = 2 (elastic modulus E = 20 MPa and Poisson’s  ratio ν = 0.45). 

• If the last four digits of your student ID ≥ 3000 but < 6000: Heavy vehicles = 10%,  annual vehicle growth rate = 5%, and Subgrade CBR = 3 (elastic modulus E = 30 MPa  and Poisson’s ratio ν = 0.45). 

• If the last for digits of your student ID ≥ 6000: Heavy vehicles = 11%, annual vehicle  growth rate = 6%, and Subgrade CBR = 4 (elastic modulus E = 40 MPa and Poisson’s  ratio ν = 0.45). 

Three materials are available for flexible pavement construction: 

• Good quality crushed rock with CBR = 85 (elastic modulus E = 850 MPa and Poisson’s  ratio ν = 0.35) 

• Marginal gravel material with CBR = 30 (elastic modulus E = 300 MPa and Poisson’s  ratio ν = 0.35) 

• Hot mix asphalt with 15% bitumen (by volume), elastic modulus E = 2600 MPa and Poisson’s ratio ν = 0.4

Dr Long Truong 1 

The following questions must be addressed: 

a) Compute the design traffic (NDT) for pavement design. 

b) Compute the design number of ESAs (DESA) applicable to a flexible pavement. c) Work out design solutions for the unbound pavement with thin bituminous surfacing: 

• Two structures: one containing only crushed rock base and the other containing a  crushed rock base and a marginal gravel sub-base 

• Two conditions of the subgrade materials: subgrade material in its natural state and  subgrade material stabilised with 6% lime.  

• There will be four unbound pavement design options altogether. Note: the unbound  pavement designs must be carried out using the empirical design approach. 

d) Work out optimum design solutions for the asphalt pavement, containing asphalt base and  a marginal gravel sub-base, for the two conditions of the subgrade materials (subgrade  material in its natural state and subgrade material stabilised with 6% lime). The thickness  of each pavement layer must be between 100mm and 300mm. There will be two asphalt  pavement design options altogether. Note: the asphalt pavement designs must be carried  out using the mechanistic design approach (i.e. CIRCLY). 

e) For six pavement designs obtained from (c) and (d), calculate total cost per m2of pavement and plot a graph comparing the cost of these designs. Pavement costs apply to the materials  and construction are included in the Pavement Design Data Excel file. 

f) Based on the cost calculation in (e), find the most economic design and draw a sketch  giving full details of the design dimensions and parameters. 

g) Discuss the environmental impacts of the unbound and asphalt pavements in general and  recommend methods to reduce these environmental impacts, with relevant supporting  references. 

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