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 TABLE 800.3: REQUIREMENTS OF CEMENT Property Permissible Value Tested as per Fineness Specific surface not less than 225 m IS: 4031 (Part 1,2 & 15) 2 /kg Setting Time Initial set > 30 minutes Final Set < 600 minutes IS: 4031 (Part 1) Soundness Not to exceed 10 mm in Lechatelier mould IS:4031 (Part 3) Compressive Strength 33 Grade 43 Grade (IS:4031:Part 6) At 3 days 16 Mpa 23 Mpa At 7 days 22 Mpa 33 Mpa At 14 days 33 Mpa 43 Mpa * The initial setting of test blocks shall not differ by ± 30 minutes from the initial setting of control test blocks prepared with the same cement and distilled water. (ii) Coarse aggregates The gradation of coarse aggregate shall satisfy the requirements given in Table 800.4 TABLE 800.4: GRADATION OF COARSE AGGREGATE Percent by weight passing the sieve for Nominal size of IS Sieve Size 40 mm 20 mm 12.5 mm 63 mm 100 - - 40 mm 95-100 100 - 20 mm 30-70 95-100 100 12.5 mm - - 90-100 10.0 mm 10-35 25-55 40-85 4.75 mm 0-5 0-10 0-10 (iii) Fine Aggregates The gradation of fine aggregates shall satisfy the requirements given in Table 800.5 TABLE 800.5: GRADATION OF FINE AGGREGATES IS Sieve Size Zone I Percent by weight passing the sieve Zone II Zone III 10 mm 100 100 100 4.75 mm 90-100 90-100 90-100 2.36 mm 60-95 75-100 85-100 1.18 mm 30-70 55-90 75-100 600 Micron 15-34 35-59 60-79 300 Micron 5-20 8-30 12-40 150 Micron 0-10 0-10 0-10 (iv) Water Samples of water used in making mortar and concrete are tested once for approval of source of supply and subsequently only in case of doubt 142
TABLE 800.6: LIMITS FOR SOLIDS IN WATER Organic 200 mg/litre Inorganic 3000 mg/litre Sulphates (as SO 4 ) 400 mg/litre 143 Quality Assurance Handbook for Rural Roads The permissible limits for solids in water are got tested in an approved laboratory as directed by Engineer as given in Table 800.6 Maximum permissible limit Chlorides (as Cl) 2000 mg/litre (For Plain Concrete) 500 mg/litre (For Reinforced Concrete Suspended matter 2000 mg/litre (v) Concrete The grades of concrete and their equivalent nominal mix (using 43 Grade cement ) are given in Table 800.7 TABLE 800.7: NOMINAL MIXES OF CONCRETE Grade of Concrete Nominal Mix M 10 1 :3 :6 M 15 1:2 ½: 5 M 20 1:2:4 M 25 1: 1½ :3 Add approved quality of plasticizer @ 300 ml per 50 kg of cement to M 25 grade concrete as per Manufacturers specifications a. The workability of fresh concrete by slump test is determined as per IS:1199 @ one test per 3m3 of concrete at the place of mixing and/or at worksite. b. Samples of concrete cubes for making three test cubes shall be taken from a batch of concrete at the point of discharge from the mixer as per the procedure laid down in IS: 1199. Only 150 mm cubes shall be made cured and tested at 28-day age, to determine compressive strength as per IS:516. (vi) Frequency of Sampling The minimum frequency of sampling of concrete of each grade is given in Table 800.8 TABLE 800.8: FREQUENCY OF SAMPLING Quantity of concrete in work (m3 ) No. of samples 1-5 1 6-15 2 16-30 3 31-50 4 Acceptance Criteria a. Take decision for acceptance based on sample tests lot by lot. b. The mean strength of any group of four consecutive samples shall exceed the specified characteristic compressive strength by 3 Mpa.
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TABLE 800.6: LIMITS FOR SOLIDS IN WATER<br />
Organic 200 mg/litre<br />
Inorganic 3000 mg/litre<br />
Sulphates (as SO 4 ) 400 mg/litre<br />
143<br />
<strong>Quality</strong> <strong>Assurance</strong> <strong>Handbook</strong> <strong>for</strong> <strong>Rural</strong> <strong>Roads</strong><br />
The permissible limits <strong>for</strong> solids in water are got tested in an approved laboratory as directed by<br />
Engineer as given in Table 800.6<br />
Maximum permissible limit<br />
Chlorides (as Cl) 2000 mg/litre (For Plain Concrete)<br />
500 mg/litre (For Rein<strong>for</strong>ced Concrete<br />
Suspended matter 2000 mg/litre<br />
(v) Concrete<br />
The grades of concrete and their equivalent nominal mix (using 43 Grade cement ) are given in<br />
Table 800.7<br />
TABLE 800.7: NOMINAL MIXES OF CONCRETE<br />
Grade of Concrete Nominal Mix<br />
M 10 1 :3 :6<br />
M 15 1:2 ½: 5<br />
M 20 1:2:4<br />
M 25 1: 1½ :3<br />
Add approved quality of plasticizer @ 300 ml per 50 kg of cement to M 25 grade concrete as per Manufacturers specifications<br />
a. The workability of fresh concrete by slump test is determined as per IS:1199 @ one test per 3m3 of<br />
concrete at the place of mixing and/or at worksite.<br />
b. Samples of concrete cubes <strong>for</strong> making three test cubes shall be taken from a batch of concrete at<br />
the point of discharge from the mixer as per the procedure laid down in IS: 1199. Only 150 mm<br />
cubes shall be made cured and tested at 28-day age, to determine compressive strength as per<br />
IS:516.<br />
(vi) Frequency of Sampling<br />
The minimum frequency of sampling of concrete of each grade is given in Table 800.8<br />
TABLE 800.8: FREQUENCY OF SAMPLING<br />
Quantity of concrete in work (m3 ) No. of samples<br />
1-5 1<br />
6-15 2<br />
16-30 3<br />
31-50 4<br />
Acceptance Criteria<br />
a. Take decision <strong>for</strong> acceptance based on sample tests lot by lot.<br />
b. The mean strength of any group of four consecutive samples shall exceed the specified<br />
characteristic compressive strength by 3 Mpa.
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