Quality Assurance Handbook for Rural Roads Volume-I - pmgsy

4. Section-300
(b) Carry out an insitu density test each at the following two locations:
(i) close to the edge of the roadway
(ii) any location selected at random
(c) If at location (i), the insitu density is lower than the lower specified limit, it goes to show that
proper precautions in regard to trimming at the verges were not taken by building the
embankment initially wider than the design embankment and then trimming at the edges.
(d) At location (ii), the insitu density test result should not be lower than the lower specified
limit. If the actual insitu density obtained at the time of checking is lower than the lower
specified limit, check on the action taken to rectify the defect and if any Non-Conformance
Report was filled up.
(e) Check, if the improved subgrade was compacted to 100% Proctor density.
(f) Check, if the improved subgrade just after compaction was properly cured for 7 days with
wet gunny bags, moist straw or sand, periodically sprinkled with water.
3. Side Slopes and Profile
(a) Simple gadgets for estimating the side slopes from the horizontal distance (horizontality
ensured by a spirit level) and vertical height of a T or L frame (Appendix 1, Para 1.8) can be
used for monitoring the actual side slopes of a completed embankment.
(b) A set of 3 observations can be expeditiously taken per km length, using such gadgets.
4. Stability and Workmanship of Cut Slopes
(in case of hilly/ rolling terrain)
(a) As per the design requirements of Cut Slopes, check if all the needed measures have been
taken for erosion control (by providing suitable species of vegetation), drainage (catch water
drains etc) and retaining structures like breast walls/ retaining walls etc.
(b) Check on the actual slope(s) provided; extent and type of vegetation provided; the crosssection,
lining and gradients of drains provided; dimensions adopted and materials used in
retaining structures, to see if they all meet the design requirements.
5. Adequacy of Slope Protection (in case of high embankments/ hilly/ rolling terrain)
(a) Check, using the simple gadgets described earlier, if the actual slopes provided are indeed
within permissible tolerances of the design slopes.
(b) In order to avoid any rain cuts along the slopes, check if the type of vegetation provided for
erosion control is of the right species and that wherever required, top soil was indeed
provided on completed embankment slopes before planting vegetation. If not, the deficiencies
should be pointed out.
(c) Check, if any design requirements like provision of stone pitching or gabions etc. are
implemented satisfactorily by examining the quality of stone pitching (e.g if the drainage
layer underneath has indeed been provided and the size and quality of stones meet the
specified requirements) and in case of gabions, the wire mesh of the crate is plastic coated
etc.
(d) Check, if the drainage system provided is as per the design requirements. Any deficiencies
observed should be brought out.
254