De6202 Highway Engineering 2|Sealing Chips Assessment Answer
granular pavement with a thin bituminous surface. Provide depth information for the granular layers (include a diagram for base and subbase thickness).
2.0 Pavement Surface Design
2.1 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.
2.2 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:
i) Surface Texture variability check.
ii) Application rate for hot binder at the spray temperature, and the total volume of hot binder needed.
iii) Chip application rate and total volume of sealing chips.
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