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-800 c. The strength of any sample shall not be less than the specified compressive strength minus 3 MPa. d. The quality of concrete represented by test results shall include the batches from which the first and last samples were taken, together with all intervening batches. (vii) Sulphate and Chloride Content The total water soluble sulphate and chloride contents in concrete shall not exceed the values given in Table 800.9 TABLE 800.9: SULPHATE AND CHLORIDE CONTENTS Details Content Sulphate content as (SO ) 3 4 percent Chloride content 0.3 percent by mass of cement (Moderate condition) (As Chloride ion) 0.20 percent by mass of cement (Severe condition) (viii) Use of plums in ordinary concrete Stone plums shall not be used in RCC or Concrete laid in water. The general requirements for the usage of plums are given in Table 800.10 TABLE 800.10 REQUIREMENT FOR USAGE OF PLUMS Size 160-300 mm (Maximum dimension not to exceed 1/3 least dimension of member) Quantity of Plums in works Not to exceed 15 percent by volume (ix). Storage of Materials (Cement, Fine and Coarse Aggregates) a. The requirements of storage for cement and fine aggregates are as per Sub-section 600. b. Store different sizes of coarse aggregates in separate stock piles sufficiently away from each other to prevent intermixing. Keep the height of individual stockpile below 120 mm, unless otherwise permitted. When placed directly on hard ground, do not remove them from stockpile within 300 mm of the ground. Use the bottom 300 mm of stockpile only after thorough cleaning of the material. 2. Tolerances The accuracy of the measuring devices used for different ingredients shall fall within the limits given in Table 800.11 TABLE 800.11: ACCURACY OF MEASURING DEVICES Measurement Quantity in each batch Cement ± 3% of cement quantity Water ± 3% of water Aggregate ± 3% of aggregate Admixture ± 5% of admixture 144
3. Mechanical Vibrators 145 Quality Assurance Handbook for Rural Roads The capacity/size of the vibrators for compaction of concrete is given in Table 800.12 TABLE 800.12: CAPACITY/SIZE OF VIBRATORS Type of Vibrator Conforming to Capacity/size Internal Vibrators IS: 2505 25-70 mm Form Vibrators IS: 4656 Minimum 500 Watts Screed Vibrators IS: 2506 Full width of carriageway (upto two lanes) 4. Quality Control Tests / Checks 4.1 Tests prior to construction The tests and checks to be carried out prior to construction are indicated in Table 800.13 TABLE 800.13: QUALITY CONTROL TESTS PRIOR TO CONSTRUCTION S.No. Material / Work Test / Check Frequency 1. Cement a) Setting Time (IS:4031 Part 5) One test for 10 tonnes of cement (same brand & grade) b) Soundness (IS:4031 Part 3) - do – c) Compressive strength of mortar cube (IS:4031 Part 6) (Table 800.3) 3 specimens for each lot 2. Coarse Aggregates a) Gradation for PCC or RCC works (Table 800.4) 3 samples for each quarry source b) Flakiness index (IS:2386 part 1) -do - c) Deleterious constituents (IS:2386 part 2) If in doubt d) Water absorption / content (IS:2386 part 3) Once for each source of supply e) Aggregate Impact value (IS:2386 part 4) One test per source of supply f) Soundness (IS:2386 part 5) [if water - do - absorption exceeds 2%] g) Alkali Silica reactivity (IS:2386 part 7) If in doubt one test at approved test house 3. Fine Aggregates a) Gradation (IS:2386 part 1) ( Table 800.5) 3 samples for each source of supply b) Deleterious Constituents (IS:2386 part 2) If in doubt, one test c) Alkali silicate reactivity (IS:2386 part 7) If in doubt, one test 4. Water Normally potable water is good enough for making concreteDetermination of Impurities - Suspended matterIS:3025 (Part 17) For large works If the quality is in - OrganicIS:3025 (Part 16) doubt Samples taken from each - Inorganic IS:3025 (Part 19) source and tested at an approved - Sulphates (as SO 3 )IS:3025 (Part 24) test house - Chlorides (as Cl)IS:3025(Part 32) (Table 800.6 for limits) 5. Concrete Mix Design (for each work) To be approved by EE for cement content, W/C ratio and use of plasticizers, if any.
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3. Mechanical Vibrators<br />
145<br />
<strong>Quality</strong> <strong>Assurance</strong> <strong>Handbook</strong> <strong>for</strong> <strong>Rural</strong> <strong>Roads</strong><br />
The capacity/size of the vibrators <strong>for</strong> compaction of concrete is given in Table 800.12<br />
TABLE 800.12: CAPACITY/SIZE OF VIBRATORS<br />
Type of Vibrator Con<strong>for</strong>ming to Capacity/size<br />
Internal Vibrators IS: 2505 25-70 mm<br />
Form Vibrators IS: 4656 Minimum 500 Watts<br />
Screed Vibrators IS: 2506 Full width of carriageway<br />
(upto two lanes)<br />
4. <strong>Quality</strong> Control Tests / Checks<br />
4.1 Tests prior to construction<br />
The tests and checks to be carried out prior to construction are indicated in Table 800.13<br />
TABLE 800.13: QUALITY CONTROL TESTS PRIOR TO CONSTRUCTION<br />
S.No. Material / Work Test / Check Frequency<br />
1. Cement a) Setting Time (IS:4031 Part 5) One test <strong>for</strong> 10 tonnes of cement<br />
(same brand & grade)<br />
b) Soundness (IS:4031 Part 3) - do –<br />
c) Compressive strength of mortar cube<br />
(IS:4031 Part 6) (Table 800.3)<br />
3 specimens <strong>for</strong> each lot<br />
2. Coarse Aggregates a) Gradation <strong>for</strong> PCC or RCC works (Table 800.4) 3 samples <strong>for</strong> each quarry source<br />
b) Flakiness index (IS:2386 part 1) -do -<br />
c) Deleterious constituents (IS:2386 part 2) If in doubt<br />
d) Water absorption / content (IS:2386 part 3) Once <strong>for</strong> each source of supply<br />
e) Aggregate Impact value (IS:2386 part 4) One test per source of supply<br />
f) Soundness (IS:2386 part 5) [if water - do -<br />
absorption exceeds 2%]<br />
g) Alkali Silica reactivity (IS:2386 part 7) If in doubt one test at approved<br />
test house<br />
3. Fine Aggregates a) Gradation (IS:2386 part 1) ( Table 800.5) 3 samples <strong>for</strong> each source of<br />
supply<br />
b) Deleterious Constituents (IS:2386 part 2) If in doubt, one test<br />
c) Alkali silicate reactivity (IS:2386 part 7) If in doubt, one test<br />
4. Water Normally potable water is good enough <strong>for</strong><br />
making concreteDetermination of Impurities<br />
- Suspended matterIS:3025 (Part 17) For large works If the quality is in<br />
- OrganicIS:3025 (Part 16) doubt Samples taken from each<br />
- Inorganic IS:3025 (Part 19) source and tested at an approved<br />
- Sulphates (as SO 3 )IS:3025 (Part 24) test house<br />
- Chlorides (as Cl)IS:3025(Part 32)<br />
(Table 800.6 <strong>for</strong> limits)<br />
5. Concrete Mix Design (<strong>for</strong> each work) To be approved by EE <strong>for</strong> cement<br />
content, W/C ratio and use of<br />
plasticizers, if any.
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