Quality Assurance Handbook for Rural Roads Volume-I - pmgsy

3. Section-400
C Do’s and Don’ts
TABLE 401.4 : QUALITY CONTROL CHECKS BY AE/EE
Stage Test Frequency Designation of
Inspecting Officer
1. Top of the First (i) Degree of (i) Minimum 3 tests for two km length or AE
Layer before Compaction part thereof;
placing the (IS:2720 Part 28) (ii) Individual test values of the degree
next GSB layer of compaction attained shall not be less
than 1% of the specified degree of
compaction. For example, for the
required degree of compaction of 100%
Proctor Density, the individual test
values shall not be less than 99% of
Proctor Density and the average of three
(or more) tests carried out in a day shall
not be less than 100% Proctor Density).
(ii) Surface Regularity
and Transverse
Profile
Random Checking EE
2. Finished GSB (i) Degree of (a) Three tests per 2 km length or part AE
Layer compaction
(IS:2720 Part 28)
thereof.
(b) One test for each km length or part
thereof.
EE
(ii) Surface Regularity
and Transverse
Profile (Camber/
crossfall/
superelevation)
Random Checking AE
Do’s Don’ts
1. Ensure uniform mixing of GSB material and water 1. Do not permit organic or other deleterious materials.
by mechanical means like tractor towed implements. 2. Do not use materials, which do not conform to the
2. Ensure that on clayey subgrades, the percent fines specified requirements, shall not be used.
passing 75 micron in the GSB material do not
exceed 5 percent.
3. Do not allow rejected material to remain at site to
prevent its reuse. The rejected material shall be marked
3. Do provide aggregate plugs at the exposed edges of
GSB where extended over the full formation width.
with lime.
4. Look for soft patches, if any, and rectify them by
removing or adding fresh material and compacting
the same thoroughly.
402. GRAVEL/SOIL-AGGREGATE BASE AND SURFACE COURSE
Gravel/Soil-Aggregate is natural gravel or a mix of crushed stone, crushed gravel, crushed slag, moorum,
sand, fine sized particles or combination thereof depending on the grading and plasticity requirements
for use in base or surface course for rural roads.
A. Methodology
1. The Gravel/Soil-Aggregate in base and surface course shall meet all the physical requirements set
forth in Para B and conform to the gradings given in Table 402.1 for base course and in Table 402.2
for surface course.
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