REQUEST FOR PROPOSALS

4.12.4. Pavement Design
1. The detailed design of pavement shall involve:
i. strengthening of existing road pavement and design of the new pavement if any,
if the findings of the traffic studies and life-cycle costing analysis confirm the
requirement for widening of the road beyond 2lane undivided carriageway
standard;
ii. pavement design for bypasses; and,
iii. Design of shoulders.
2. The design of pavement shall primarily be based on IRC publications.
3. The design of pavement shall be rigorous and shall make use of the latest
Indian and International practices. The design alternatives shall include both
rigid and flexible design options. The most appropriate design, option shall
be established on life-cycle costing and techno-economic consideration.
4. For the design of pavement, each set of design input shall be decided on the
basis of rigorous testing and evaluation of its suitability and relevance in
respect of in service performance of the pavement. The design methodology
shall accompany the design proposals and shall clearly bring out the basic
assumptions, values of the various design inputs, rationale behind the selection
of the design inputs and the criteria for checking and control during the
implementation of works. In other words, the design of pavement structure
should take due account of the type, characteristics of materials used in the
respective courses, variability of their properties and also the reliability of traffic
predictions. Furthermore, the methodology adopted for the design of pavement
shall be complete with flowcharts indicating the various steps in the design
process, their interaction with one another and the input parameter required at
each step.
5. For the design of overlays for the existing 2-lane pavement, the strengthening
requirement shall duly take into account the strength of the existing pavement
vis-à-vis the remaining life. The overlay thickness requirements shall be worked
out for each road segment homogenous with respect to condition, strength and
sub-grade characteristics. The rehabilitation provisions should also include the
provision of regulating layer. For existing pavement with acceptable levels of
cracking, provision of a crack inhibiting layer should also be included.
6. Latest techniques of pavement strengthening like provision of geo-synthetics
and cold/hot pavement recycling should be duly considered by the Consultant
for achieving economy.
7. The paved shoulders shall be designed as integral part of the pavement for the
main carriageway. The design requirements for the carriageway pavement
shall, therefore, be applicable for the design of shoulder pavements. The design
of granular shoulder should take into account the drainage considerations
besides the structural requirements.
8. The pavement design task shall also cover working out the maintenance and
strengthening requirements and periodicity and timing of such treatments.
4.12.5. Design of Embankments