Quality Assurance Handbook for Rural Roads Volume-I - pmgsy

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3. Section-400 2. The pulverization of soil clods and mixing of pulverized soil should be accomplished by using tractor-towed implements. The pulverization of clods shall meet the requirements of Table 403.1. TABLE 403.1 SOIL PULVERISATION REQUIREMENTS FOR LIME STABILIZATION 3. The thickness of any layer to be treated shall be 100 mm when compacted. The maximum thickness shall be 200 mm provided the plant is accepted by the Engineer. 4. Lime may be mixed with the prepared material either in slurry form or dry state as approved by the Engineer. The top of windrowed material may be flattened or slightly trenched to receive the lime. The distance to which lime is to be spread upon the prepared material ahead of mixing operation shall be determined by the Engineer for which trial runs are advisable. 5. It is good practice to pre-condition the soil by addition of 2% lime in the first instance and leaving it overnight before adding the remaining portion of lime the next day. 6. Appropriate tractor-towed equipment, approval by the Engineer, are suitable for various operations in the construction process, like pulverization of soil clods by tractor-towed disc harrows and mixing of soil with lime by tractor-towed Rotavator. Manual mixing may be permitted only where the width of laying is not adequate for mechanical operations as in small-sized jobs. 7. The moisture content of soil-lime mix at compaction shall be within (±) 2% of optimum moisture content determined on the basis of IS:2720 (Part 7). Immediately after spreading, grading and levelling of the mixed material, compaction shall be carried out. During rolling, the surface shall be checked for grade and camber. A density of at least 100% of the maximum dry density of the material, as determined in accordance with IS:2720 (Part 7) shall be achieved. 8. The sub-base shall be cured by moist curing with water for a period of 7 days after which subsequent pavement courses shall be laid to prevent the surface from drying out and becoming friable. B Quality Control Requirements 1. Materials IS Sieve Designation Percent passing 26.5 mm 100 5.6 mm 80 (i) Soil: For the lime treatment to be effective in bringing about significant reduction in PI and increase in the CBR value, the PI of the soil to be treated should generally be higher than 10. (ii) Lime: Lime for lime-soil stabilization work shall be commercial dry lime slaked at site or pre-slaked lime delivered to the site in suitable packing. The lime shall have purity of not less than 70% by weight of CaO when tested in accordance with IS:1514 (iii) Water: The water to be used for lime stabilization shall be clean and free from injurious substances. Potable water shall be preferred. 48
2. Horizontal Alignment 49 Quality Assurance Handbook for Rural Roads The edges of the sub-base shall be correct within a tolerance limit of (±) 30 mm in plain and rolling terrain and (±) 50 mm in hilly terrain. 3. Surface Levels The tolerance in surface levels for lime-treated improved subgrade shall be (+) 20 mm and (-) 25 mm; while for the lime-treated soil subbase shall be (+) 10 mm and (-) 20 mm. A grid of 10 m by 2.5 m may be formed to check the surface level. 4. Surface Regularity The maximum permitted difference between the sub-base and 3 m straight edge shall be 12 mm for longitudinal profile and 10 mm for cross profile. In case of improved subgrade, the maximum permitted difference shall be 20 mm for longitudinal profile and 15 mm for cross profile. The transverse profile shall conform to the prescribed camber. 5. Degree of Compaction When lime is used for improving the subgrade, the soil-lime mix shall be tested for CBR value. When lime stabilized soil is used in a sub-base it shall be tested for CBR value/ unconfined compressive strength (UCS). The laboratory CBR/ UCS value shall be atleast 1.5 times the minimum field value of CBR/ UCS stipulated in the Contract. 6. Quality Control Tests 6.1 Tests Prior to Construction The quality control tests to be carried out prior to construction are indicated in Table 403.2. Table 403.2 : QUALITY CONTROL TESTS PRIOR TO CONSTRUCTION Type of Test Frequency 1. Purity of Lime (IS:1514) One test for each lot of lime 2. Determination of optimum quantity of lime to attain Mean of two tests. the specified reduction in PI and/or to achieve the specified CBR 3. Plasticity Index test (IS:2720 Part 5) of the lime-treated Mean of two tests per km length on the representative soil (mixed with the required amount of lime) sample of a lime-treated soil mix with the required amount of lime. 4. CBR (IS:2720 Part 16) or Unconfined Compressive One test on a set of 3 specimens per km length. Strength (IS:4332 Part 5) if specified. 6.2 Tests During Construction The quality control tests to be carried out during construction are indicated in Table 403.3.
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Page 4 and 5: FOREWORD PREFACE ABBREVIATIONS QUAL
Page 6 and 7: Section 1100 PIPE CULVERTS 163 to 1
Page 8 and 9: PREFACE A good road network has an
Page 10 and 11: AE : Assistant Engineer AIV : Aggre
Page 12 and 13: 1. BACKGROUND 1 Quality Assurance H
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Page 16 and 17: Material tests Workmanship tests Se
Page 18 and 19: 2. Quality Management System (iii)
Page 20 and 21: 2. Quality Management System A typi
Page 22 and 23: 105. CONSTRUCTION EQUIPMENT 13 Qual
Page 24 and 25: B Do’s and Don’ts Do’s Don’
Page 26 and 27: 201 & 202. SITE CLEARANCE A Methodo
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Page 30 and 31: (vii) Materials in a frozen conditi
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Page 44 and 45: SECTION 400 39 Quality Assurance Ha
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Page 84 and 85: SECTION 500 BITUMINOUS 81 Quality A
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3. Section-500 5. Quality Control T
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3. Section-500 TABLE 508.1.1 : QUAN
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3. Section-500 Table 508.1.3: QUALI
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3. Section-500 B. Quality Control R
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3. Section-500 (ii) Immediately the
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3. Section-500 512. MODIFIED BITUME
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3. Section-500 TABLE 512.5 : REQUIR
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Annex-III & IV DETERMINATION OF IN-
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SIMPLE/HANDFEEL TESTS 600 600.1 Bri
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119 Quality Assurance Handbook for
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SECTION 600 121 Quality Assurance H
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3. Section-600 4. Build the courses
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3. Section-600 (v) Storage of mater
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3. Section-600 3.3. Quality Control
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700 : STONE MASONRY FOR STRUCTURES
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(v) Stone Masonry 133 Quality Assur
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4.2. Tests / checks during construc
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SECTION 800 CONCRETE FOR STRUCTURES
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3. Section-800 2. Proceed with conc
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3. Section-800 TABLE 800.3: REQUIRE
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3. Section-800 c. The strength of a
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3. Section-800 4.2 Tests / checks d
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SECTION 900 149 Quality Assurance H
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3. Section-900 2. Lower centering g
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3. Section-900 C. Do’s and Don’
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1000 STEEL REINFORCEMENT A. Methodo
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3.2 Tests during construction 159 Q
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1100: PIPE CULVERTS A. Methodology
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SECTION 1200 167 Quality Assurance
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3. Section-1200 A2 Substructures Th
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3. Section-1200 4. Provide 75 mm ce
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3. Section-1200 (2) Tolerances 1200
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3. Section-1200 3.2 Tests / checks
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3. Section-1300 A-3 Toe Protection
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3. Section-1300 2. Stones for pitch
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3. Section-1400 3. Give streamline
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3. Section-1400 2. Tests during con
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3. Section-1500 5 Mark location and
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3. Section-1500 (iv) Water Water us
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3. Section-1500 TABLE 1501.3: QUALI
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3. Section-1500 2. Check the in-sit
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3. Section-1500 TABLE NO. 1502.3: P
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3. Section-1500 1503: RECTANGULAR C
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3. Section-1500 3.2 Tests during co
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3. Section-1500 1504: INTERLOCKING
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3. Section-1500 2. Quality Control
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3. Section-1600 The prescribed road
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3. Section-1600 C. Do’s and Don
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1700. TRAFFIC SIGNS AND MARKINGS A.
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1904 : MAINTENANCE OF BITUMINOUS SU
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4.6 Settlement and Upheaval 235 Qua
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2. Surface Finish 237 Quality Assur
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1908 : MAINTENANCE OF CULVERTS AND
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4. Quality Monitoring only in excep
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1. SECTION 100: GENERAL 1.1: Qualit
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10 5R 60 106 25 DIA WELDED 21 DIA 1
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4. Section-300 (b) Carry out an ins
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4. Section-300 Photo 1. Visual Clas
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Test 1 261 Quality Assurance Handbo
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4. Section-500 (iii) Check the aggr
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5. SECTION 1100:PIPE CULVERTS 267 Q
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6. SECTION 1300: PROTECTION WORKS A
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4. Section-1500 In case of cracked
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4. Section-1700 2. Road Markings C
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Appendix-1 1.4 Estimating Plasticit
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Appendix-1 1.8 Simple Gadgets for E
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Appendix-1 (ii) Make two identical
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Appendix-1 (ii) Workability: Take a
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Appendix-2 Curing : Covering the c
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Appendix-3 Sr. Code/ Title of the P
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Quality Assurance Handbook for Rura
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