Quality Assurance Handbook for Rural Roads Volume-I - pmgsy

3. Section-400
C Do’s and Don’ts
407. Shoulder Construction
A. Methodology
Do’s Don’ts
1. Ensure compliance of all material and plant
requirements.
2. Check aggregate for soundness test when water
absorption is more than 2 %.
3. Build shoulders simultaneously along with WMM
layers.
4. Remove BT surface before WMM is laid on an
existing road.
1. The construction of shoulders (whether hard/gravel or earth with brick or stone block edging) on
either side of the road pavement, should be in conformity with the specified lines, grades and
cross-sections.
2. The shoulders with specified dimensions should be constructed in layers, each layer matching the
thickness of adjoining pavement layer.
3. After a pavement layer and the corresponding layers in hard and earth shoulder portion have
been laid and compacted, the construction of next pavement layer and shoulder should be taken
up.
4. The adjacent layers having same material should be laid and compacted together. However, where
the materials in adjacent layers are different, these should be laid together, but the pavement layer
should be compacted first.
5. Where hard/gravel shoulders have to be provided alongside the existing carriageway, the existing
shoulders should be excavated in full width and to the required depth to ensure proper compaction.
6. For earth shoulders with brick/stone edging, the bricks/stone blocks should be laid on edge, with
the length parallel to the transverse direction of the road. These should be laid on a bed of 25 mm
sand, set carefully, rolled into position by a light roller and made flush with the finished pavement
level.
7. Earth/gravel shoulder should be compacted to at least 100 per cent of maximum dry density as
per IS:2720 Part 7.
8. In order to shed off surface water, the required cross-fall should be maintained during all stages
of construction. Normally cross-fall on shoulder should be 1 per cent higher than the camber on
the main carriageway.
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1. Do not use material other than crushed stone.
2. Do not allow segregation or pockets of coarse/fine
material on the layer.
3. Do not allow any traffic on the WMM surface without
covering it with a wearing course.