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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5. <strong>Quality</strong> Control Tests<br />
77<br />
<strong>Quality</strong> <strong>Assurance</strong> <strong>Handbook</strong> <strong>for</strong> <strong>Rural</strong> <strong>Roads</strong><br />
<strong>Quality</strong> Control tests <strong>for</strong> Crusher Run Macadam Base and their frequency shall be the same as<br />
indicated in Tables 406.3, 406.4 and 406.5 <strong>for</strong> Wet Mix Macadam Base.<br />
C. Do’s and Don’ts<br />
1. If crushed gravel is used ensure that not less than<br />
90% by weight of crushed gravel/ shingle, retained<br />
on 4.75 mm sieve shall have at least two fractured<br />
faces.<br />
2. Use templates at about 6 m apart to check surface to<br />
profile.<br />
3. Ensure that the quantity of water applied is sufficient<br />
to prevent segregation of the fine and coarse particles<br />
and to achieve the requisite compaction with<br />
maximum dry density as per IS: 2720 (Part 7)<br />
4. Build up shoulders alongwith crusher run macadam<br />
base.<br />
412. BRICK SOLING<br />
A. Methodology<br />
Do’s Don’ts<br />
1. Do not use material other than crusher run material.<br />
2. Do not use any filler material.<br />
3. Do not spread aggregate more than 3 days in advance<br />
of the construction operations.<br />
1. The edges of soling shall be marked with the help of stakes and string.<br />
2. The subgrade shall be prepared to the required grade and camber and made free of dust and<br />
other extraneous material. All ruts, de<strong>for</strong>mations and soft spots shall be corrected and rolled.<br />
3. The side shoulders shall be constructed in advance to a thickness corresponding to the brick layer.<br />
Alternatively, mud walls may be constructed to provide lateral confinement.<br />
4. The bricks shall be laid in herring bone bond or in header and stretcher bond laid on edge or flat<br />
in layers, as specified.<br />
5. The joints shall not exceed 10 mm in thickness.<br />
6. After laying bricks, sand shall be spread over the bricks to a thickness of about 25 mm.<br />
7. The soling shall be lightly rammed.<br />
B. <strong>Quality</strong> Control Requirements<br />
1. Materials<br />
(i) Straight burnt clay bricks shall be used con<strong>for</strong>ming to the requirements of IS:1077, except<br />
that the minimum compressive strength, when tested flat shall not be less than 8.4 MPa <strong>for</strong><br />
individual bricks and 10.6 MPa <strong>for</strong> average of 5 specimens.<br />
(ii) The bricks shall have rectangular faces. The size may vary according to local practice with a<br />
tolerance of (±) 5%.<br />
(iii) The bricks should emit a clear ringing sound when struck.
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