Quality Assurance Handbook for Rural Roads Volume-I - pmgsy
Quality Assurance Handbook for Rural Roads Volume-I - pmgsy
Quality Assurance Handbook for Rural Roads Volume-I - pmgsy
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2. Surface Finish<br />
237<br />
<strong>Quality</strong> <strong>Assurance</strong> <strong>Handbook</strong> <strong>for</strong> <strong>Rural</strong> <strong>Roads</strong><br />
The surface finish after the routine maintenance repairs and periodic regravelling should con<strong>for</strong>m<br />
to the requirements laid down in Sub-section 402.<br />
3. Camber/Cross-fall<br />
Check that the final surface con<strong>for</strong>ms to the specified camber/cross fall.<br />
C. Do’s and Don’ts<br />
Do’s Don’ts<br />
1. Do ensure that any gravel used <strong>for</strong> repairs, whether<br />
as salvaged material or as fresh material meets the<br />
specified requirements <strong>for</strong> use in the layer in<br />
question.<br />
2. The grader should start from the edges of the road<br />
and work towards the center.<br />
3. The surface of a gravel road should be improved by<br />
dragging with the use of an approved drag.<br />
4. Do make sure that prior to filling up local<br />
depressions, ruts, potholes and erosion gullies, the<br />
affected area is first cleaned of all loose material,<br />
brought to a regular shape and the bottom surface<br />
hand-rammed.<br />
1906: MAINTENANCE OF WBM ROAD<br />
1. Do not allow heavy grading, without the provision of<br />
additional surface material if the remaining thickness<br />
of gravel is less than 75 mm<br />
2. Do not use any scrapped gravel <strong>for</strong> repairs, if it does<br />
not meet the specified requirements.<br />
3. Do not spread additional gravel <strong>for</strong> re-gravelling on<br />
the old surface without scarifying the old surface.<br />
4. Do not start roller compaction unless the material to<br />
be compacted is at a moisture content equal to OMC ±<br />
2%.<br />
5. Do not use manual methods <strong>for</strong> making up the loss of<br />
profile without the approval of the Engineer.<br />
It is considered an essential requirement prior to undertaking any maintenance measures that the WBM<br />
road be inspected once a year and that the past record of per<strong>for</strong>mance, maintenance and traffic data is<br />
available with the Maintenance Engineer.<br />
A. Methodology<br />
I. Routine Maintenance<br />
1. After a field inspection, determine the areas <strong>for</strong> (a) filling up potholes (b) filling up ruts, (c) rectifying<br />
corrugated surface, (d) repairing damaged edges and (e) rectifying ravelled surface.<br />
2. Be<strong>for</strong>e filling up a pothole, remove all loose material from the pothole upto the firm base, cut the<br />
affected area made into a regular rectangular shape with sides of the hole kept vertical. Fill the<br />
prepared pothole space with aggregate of the same size and type as used in the original layer and<br />
apply screenings and binding material of the same type (if found suitable) as used in original<br />
construction over the aggregate and compact by hand rammer. After watering, compact the layer<br />
again by hand rammer first and then by a road roller.<br />
3. Clean the rutted potion of all loose material and sprinkle with water and shape the rutted portion<br />
into a rectangular portion with flat bottom. Fill the prepared rut portion with salvaged material, if<br />
found suitable and/or fresh suitable aggregates and roll after addition of screenings, binding<br />
material and watering following the standard procedure as per Sub-section 405. After rolling,<br />
provide a 6 mm sand layer over the finished surface and lightly sprinkle with water.
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