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 TABLE 402.2: GRADING AND PLASTICITY INDEX REQUIREMENTS FOR SURFACE COURSE (ii) Wet Aggregate Impact Value (IS:5640) shall not exceed 40 and 30 when used in base and 30 when used in surfacing. (iii) Flakiness Index (IS:2386 Part I) shall not exceed 25 percent when used in base and 20 when used in surfacing. (iv) In high rainfall areas (annual rainfall of 1500 mm or above), coastal areas and where local soils are salt infested, if the water absorption value of the coarse aggregate is greater than 2 percent, the Soundness test shall be carried out on the material delivered to the site as per IS:2386 (Part 5). (a) Loss with Sodium Sulphate, 5 cycles : 12 per cent maximum (b) Loss with Magnesium Sulphate, 5 cycles : 18 per cent maximum (v) If crushed slag is used, Clause 405.2.5 of MORD specifications shall apply. (vi) If crushed gravel/shingle is used, not less than 90 per cent by weight of the gravel/shingle pieces retained on 4.75 mm sieve shall have at least two fractured faces. (vii) The needed gradation shall be obtained by crushing, screening and blending processes as necessary. (viii) Fine aggregate material passing 4.75 mm sieve shall consist of natural or crushed sand and fine mineral particles. 2. Horizontal Alignment The edges of the Base shall be correct within a tolerance limit of (±) 30 mm in plain and rolling terrain and (±) 50 mm for hilly areas. The edges of the carriageway with Gravel/Soil-Aggregate Surfacing shall be correct within (±) 20 mm in plain and rolling terrain and (±) 30 mm in hilly terrain. 3. Surface Levels IS Sieve Designation Per cent by Weight Passing IS Sieve 26.5 mm 100 19 mm 97–100 4.75 mm 41–71 425 µ 12-28 75 µ 9–16 Plasticity Index 4–10 The tolerance in surface level for Gravel/Soil-Aggregate Base and Surface will be restricted to (±) 10 mm. A grid of 10 m by 2.5 m may be formed to check the surface level. 46
4. Surface Regularity 47 Quality Assurance Handbook for Rural Roads The maximum permitted difference between the Gravel/Soil-Aggregate layer and 3 m straight edge shall be 12 mm for longitudinal profile and 10 mm for cross profile. The cross profile should conform to the prescribed camber. 5. Degree of Compaction Density shall be 100 per cent of maximum dry density for the material determined as per IS:2720 Part 7. 6. Quality Control Tests The quality control tests and their frequency for gravel/soil-aggregate base and surface construction shall be as per Tables 401.2, 401.3 and 401.4. C. Do’s and Don’ts Do’s Don’ts 1. While preparing the subbase/base, where predominant irregularities exist, make sure that the surface profile is corrected before spreading the Gravel/Soil-Aggregate Mix. 2. For the equipment used for mix-in-place construction, carry out trial runs to establish the suitability for the work 3. Look for soft patches, if any and rectify them by removing or adding fresh material and compacting the same thoroughly. 4. For obtaining the needed uniformity of mixing of water with Gravel/Soil-Aggregate, sufficient passes of mechanical equipment like tractor-towed disc harrows/rotavators should be ensured. 1. Do not permit any organic or deleterious material. 2. Do not allow Manual mixing should unless the width of laying is not adequate for mechanical operations, as in small-sized jobs. 3. Do not allow the speed of the roller to exceed 5 km per hour. 403. LIME TREATED SOIL FOR IMPROVED SUBGRADE/ SUB-BASE Lime treatment is generally adopted for silty clays and clayey soils, including black cotton soils. Reduction in plasticity index and development of strength in lime soil mixes depend upon the type and content of clay in the soil. A Methodology 1. The amount of lime required for stabilization of the soil, should be determined on the basis of mix design to achieve the required CBR value. By way of general guidelines, lime content for different types of soil is normally as under: Alluvial soils and Moorum (PI : 10-15) 3% Clays/ BC soil of medium plasticity (PI : 15-30) 3-5% Highly expansive Clays (PI : over 30) 5-6%
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4. Surface Regularity<br />
47<br />
<strong>Quality</strong> <strong>Assurance</strong> <strong>Handbook</strong> <strong>for</strong> <strong>Rural</strong> <strong>Roads</strong><br />
The maximum permitted difference between the Gravel/Soil-Aggregate layer and 3 m straight<br />
edge shall be 12 mm <strong>for</strong> longitudinal profile and 10 mm <strong>for</strong> cross profile. The cross profile should<br />
con<strong>for</strong>m to the prescribed camber.<br />
5. Degree of Compaction<br />
Density shall be 100 per cent of maximum dry density <strong>for</strong> the material determined as per IS:2720<br />
Part 7.<br />
6. <strong>Quality</strong> Control Tests<br />
The quality control tests and their frequency <strong>for</strong> gravel/soil-aggregate base and surface construction<br />
shall be as per Tables 401.2, 401.3 and 401.4.<br />
C. Do’s and Don’ts<br />
Do’s Don’ts<br />
1. While preparing the subbase/base, where<br />
predominant irregularities exist, make sure that the<br />
surface profile is corrected be<strong>for</strong>e spreading the<br />
Gravel/Soil-Aggregate Mix.<br />
2. For the equipment used <strong>for</strong> mix-in-place<br />
construction, carry out trial runs to establish the<br />
suitability <strong>for</strong> the work<br />
3. Look <strong>for</strong> soft patches, if any and rectify them by<br />
removing or adding fresh material and compacting<br />
the same thoroughly.<br />
4. For obtaining the needed uni<strong>for</strong>mity of mixing of<br />
water with Gravel/Soil-Aggregate, sufficient passes<br />
of mechanical equipment like tractor-towed disc<br />
harrows/rotavators should be ensured.<br />
1. Do not permit any organic or deleterious material.<br />
2. Do not allow Manual mixing should unless the width<br />
of laying is not adequate <strong>for</strong> mechanical operations, as<br />
in small-sized jobs.<br />
3. Do not allow the speed of the roller to exceed 5 km per<br />
hour.<br />
403. LIME TREATED SOIL FOR IMPROVED SUBGRADE/ SUB-BASE<br />
Lime treatment is generally adopted <strong>for</strong> silty clays and clayey soils, including black cotton soils. Reduction<br />
in plasticity index and development of strength in lime soil mixes depend upon the type and content of<br />
clay in the soil.<br />
A Methodology<br />
1. The amount of lime required <strong>for</strong> stabilization of the soil, should be determined on the basis of mix<br />
design to achieve the required CBR value.<br />
By way of general guidelines, lime content <strong>for</strong> different types of soil is normally as under:<br />
Alluvial soils and Moorum (PI : 10-15) 3%<br />
Clays/ BC soil of medium plasticity (PI : 15-30) 3-5%<br />
Highly expansive Clays (PI : over 30) 5-6%
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