Highway Engineering Chapter 9 (Part 7)

Maintenance techniques for flexible pavement

Match the following

• Resurfacing

• • Generally there are three (3) types of recycling techniques:

  i. Hot Plant Mix Recycling

  ii. Hot In-Place Recycling

  iii. Cold In-Place Recycling

  • Factors on selecting the types of recycling techniques:

  ✓ Road agency's awareness of technology

  ✓ Contractor's competency

  ✓ Life cycle cost analysis

  ✓ Pavement design life

  ✓ Types of material of present pavement

  ✓ Funding level

• Recycling

• • Is the replacement of full, including sub-grade or part of the pavement using fresh material & new pavement construction specification.

  • The deterioration can be determine by inspection and confirmed with in-situ testing.

  In board term, failure manifestations for reconstruction are:

  ✓ Severe shoving

  ✓ > 20mm rutting

  ✓ Crocodile cracking with depression

  ✓ Severe potholes

• Reconstruction

• ■ The most popular rehabilitation technique in Malaysia.

  ■ Consists of placing the needed thickness of hot mix asphalt on an existing pavement.

  ■ Will return the pavement to a high level of serviceability & provide the necessary structural strength for the pavement design period.

  ■ Two technique used

  1) Pre-overlap Gained

  2) Without pre-overlap of granular material