Assignment Task
Assignment 3: Pavement and Wearing Surfaces
(25 Marks, weighting 10% of final grade)
Submission:One PDF file via Moodle
Your submission should be in one PDF file format including any hand written works, excel spread sheet etc. Show all necessary working and steps for full marks. Use this page as the cover page for your submission.
Name your pdf file as follows: (Surname CourseCode A3.pdf), e.g. for John Doe in DE6202, name the file “Doe DE6202 A3.pdf”.
Due:8am, 19 October 2021.
Student ID Student Name Total Marks Comments
Site Description
A rural road realignment (240 metres) in Canterbury is to be designed and constructed. Assume the traffic grows geometrically at 2% per year. Currently the AADT is 7000 vpd. The road has two lanes with a distribution factor of 1.0 and a direction factor of 0.6. The percentage of heavy vehicles is 8%. Assume the subgrade CBR is 5. The design period is 30 years.
Design of Unbound Granular Pavement with Thin Bituminous Surfacing (25 Marks)
1.0Pavement Structure Design
A pavement structure design is required using the Austroads empirical method for an unbound granular pavement with a thin bituminous surface. Provide depth information for the granular layers (include a diagram for base and subbase thickness).
Pavement Surface Design
First coat seal
Calculate the residual application rate (R) for a single coat chipseal with chip grade 4 (available materials with typical ALDs are provided). Where the application rate should be increased by 0.1l/m2 for absorption (due to it being a first coat) and increase by 0.05 l/m2 for urban factor.
Remember there is no texture data for a first coat seal design. For Td in the 2004 Algorithm you use the assumed value provided in Page 353 of Chipsealing NZ.
Second coat seal
Two years later a second coat seal is required, the AADT has increased as per the assumed growth rate . A chip grade of 3 is to be used. Sand circle data has been collected and is attached. The shade temperature is assumed to be 15degC. Assume that 80/100 grade bitumen is recommended.
Provide the following information for each lane:
Surface Texture variability check.
Application rate for hot binder at the spray temperature, and the total volume of hot binder needed.
Chip application rate and total volume of sealing chips.
Note:
As part of this assignment you will be required to obtain the correct information from tables provided in NZTA specifications and additional reference material.
Delivery Requirements
A memorandum should be written and attached to the front of the calculations. The memorandum should be addressed to the tutor and provide a description of the site and project as well as providing a summary of the resulting designs of the pavement, first coat seal and second coat seal. All detailed calculations should be handwritten (except any excel analysis) and attached to the memorandum.
Marking Schedule: Part 1 – Unbound Granular Pavement with Thin Bituminous Surfacing
Criteria (25 marks) Tutor’s comments
Memorandum 3 marks Project site description provided; (1 mark)
Project design requirements provided; (1 mark)
Summary of resulting design. (1 mark) Part 1 – Pavement Design 7 marks Calculation of design traffic and DESA correct and complete (3 marks).
Using empirical method design the depth of pavement (3 marks).
Labelled diagram of pavement structure design (1 mark). Part 2 – Surface Design 15 marks 2.1 First coat seal (5 marks)
Calculations correct and complete. (3 marks)
Assumed values identified, all applicable standards and tables referenced. (2 marks) 2.2 Second coat seal (10 marks)
Lanes are designed separately. (2 marks)
Surface variability check done using sand circle information. (2 Marks)
Application rate and volume calculations correct and complete. (6 Marks)
Appendix
Chip stone supply information
Grade of Chip ALD (mm) 1 12 AGD:ALD is 2:1
2 10 3 8 4 6.5 5 5 Sand circle results (Sand Circle Diameter in mm, per TNZ T/3:1981)
Lane 1; Northern Bound
Chainage wheelpath centreline
0 200 185
50 195 176
100 190 180
150 205 177
200 210 185
240 190 170
Lane 2; Southern Bound
Chainage wheelpath centreline
0 205 190
50 195 176
100 190 180
150 200 177
200 200 185
240 190 190
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