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
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. 44
45 Quality Assurance Handbook for Rural Roads 2. Before receiving the Gravel/Soil-Aggregate material, the sub-base/base, as the case may be, shall be prepared to the specified lines and cross fall. Any existing ruts, predominant irregularities or soft yielding places should be corrected and rolled until a firm surface is obtained. 3. The Gravel/Soil-Aggregate material meeting all the specified requirements shall be spread on the prepared surface with the help of a grader of adequate capacity, for maintaining the required slope and grade. 4. Where combination of different materials is required for obtaining the Gravel/Soil-Aggregate meeting the specified requirements, mixing shall be done mechanically by the mix-in-place method. 5. The equipment for mix-in-place shall be a tractor-towed rotavator or similar equipment capable of mixing the materials to the desired degree. 6. It must be ensured that prior to compaction, the moisture content is within 2 percent of the optimum moisture content, making due allowance for evaporation losses. After adding the required quantity of water, the material should be processed by mechanical means like tractor-towed disc harrows/ rotavators until the layer is uniformly wet. 7. Rolling shall be carried out as per Para 402.4.2 of MoRD Specifications. 8. The density to be achieved should be 100% of the maximum dry density for the material determined as per IS:2720 (Part 7). 9. Any loose, segregated or otherwise defective areas should be made good to full thickness of layer and re-compacted. B. Quality Control Requirements 1. Materials (i) The grading for Gravel/Soil-Aggregate Base shall conform to the requirements given in Table 402.1 while the grading for Gravel/Soil-Aggregate Surface Course shall conform to the requirements given in Table 402.2. For the fraction passing 4.75 mm, wet sieve analysis should be done. TABLE 402.1: GRADING AND PLASTICITY REQUIREMENTS FOR BASE COURSE IS Sieve desperation Per cent by Weight Passing IS Sieve Grading A Grading B Grading C 53 mm 100 37.5 mm 97–100 100 26.5 mm 97–100 100 19 mm 67–81 97–100 9.5 mm 56–70 67–79 4.75 mm 33–47 39–53 47–59 425 µ 10–19 12–21 12–21 75 µ 4.0–8.0 4.0–8.0 4.0–8.0 Note: The Liquid Limit shall not exceed 25 and PI shall not exceed 6.
- Page 2 and 3: Ministry of Rural Development Gover
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45<br />
<strong>Quality</strong> <strong>Assurance</strong> <strong>Handbook</strong> <strong>for</strong> <strong>Rural</strong> <strong>Roads</strong><br />
2. Be<strong>for</strong>e receiving the Gravel/Soil-Aggregate material, the sub-base/base, as the case may be, shall<br />
be prepared to the specified lines and cross fall. Any existing ruts, predominant irregularities or<br />
soft yielding places should be corrected and rolled until a firm surface is obtained.<br />
3. The Gravel/Soil-Aggregate material meeting all the specified requirements shall be spread on the<br />
prepared surface with the help of a grader of adequate capacity, <strong>for</strong> maintaining the required<br />
slope and grade.<br />
4. Where combination of different materials is required <strong>for</strong> obtaining the Gravel/Soil-Aggregate<br />
meeting the specified requirements, mixing shall be done mechanically by the mix-in-place method.<br />
5. The equipment <strong>for</strong> mix-in-place shall be a tractor-towed rotavator or similar equipment capable<br />
of mixing the materials to the desired degree.<br />
6. It must be ensured that prior to compaction, the moisture content is within 2 percent of the optimum<br />
moisture content, making due allowance <strong>for</strong> evaporation losses. After adding the required quantity<br />
of water, the material should be processed by mechanical means like tractor-towed disc harrows/<br />
rotavators until the layer is uni<strong>for</strong>mly wet.<br />
7. Rolling shall be carried out as per Para 402.4.2 of MoRD Specifications.<br />
8. The density to be achieved should be 100% of the maximum dry density <strong>for</strong> the material determined<br />
as per IS:2720 (Part 7).<br />
9. Any loose, segregated or otherwise defective areas should be made good to full thickness of layer<br />
and re-compacted.<br />
B. <strong>Quality</strong> Control Requirements<br />
1. Materials<br />
(i) The grading <strong>for</strong> Gravel/Soil-Aggregate Base shall con<strong>for</strong>m to the requirements given in<br />
Table 402.1 while the grading <strong>for</strong> Gravel/Soil-Aggregate Surface Course shall con<strong>for</strong>m to<br />
the requirements given in Table 402.2. For the fraction passing 4.75 mm, wet sieve analysis<br />
should be done.<br />
TABLE 402.1: GRADING AND PLASTICITY REQUIREMENTS FOR BASE COURSE<br />
IS Sieve desperation Per cent by Weight Passing IS Sieve<br />
Grading A Grading B Grading C<br />
53 mm 100<br />
37.5 mm 97–100 100<br />
26.5 mm 97–100 100<br />
19 mm 67–81 97–100<br />
9.5 mm 56–70 67–79<br />
4.75 mm 33–47 39–53 47–59<br />
425 µ 10–19 12–21 12–21<br />
75 µ 4.0–8.0 4.0–8.0 4.0–8.0<br />
Note: The Liquid Limit shall not exceed 25 and PI shall not exceed 6.