Pages From 02b. Specifications-concrete Mix
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Improvement and Maintenance of Roads and Minor Infrastructure Projects in and Surrounding Areas of LIWA. STANDARD SPECIFICATIONS – VOLUME 2 Page No. 189/754 SECTION V-2 CONCRETE CLASSES AND MIXES 502.01 Description . The concrete classes and mixes to be incorporated in the Works shall be as specified herein. 502.02 Concrete Classes. a. General . Concrete shall have the mix designations and strength requirements indicated in Table 502.02 except for those specifically mentioned elsewhere in these Standard Specifications. b. Class Requirements . The approximate weights or volumes of the components for each class of concrete and any other data given in any table of these specifications or the Particular Specifications are as an aid to the Engineer for suggested trial mix and also will be of value to Tenderers and Contractors in determining the approximate quantities of components required. However, the minimum crushing strength of Work Test Cubes at 7 days and 28 days must be strictly adhered to. Acceptance of the work by the Engineer will be based on 28-day cube strength as determined under Clause 502.06, Testing, of these Standard Specifications. Concrete to be used shall include the mix designations and strength requirements indicated in Table 502.02. Method for Testing Concrete, B.S. 1881, shall govern for the manufacture of compressive strength test cubes for all classes of concrete, except as specified for piles in Section XI, Concrete Pile Foundations. Requirements Class of Concrete K140 K250 K335 K415 K455 K500 Minimum crushing strength kg/cm² Preliminary Test Cubes at 7 days 140 250 335 415 455 500 Minimum crushing strength kg/cm² Work Test Cubes at 7 days 100 185 250 310 345 375 Minimum crushing strength kg/cm² Preliminary Test cubes at 28 days 185 335 445 555 605 665 Minimum crushing strength kg/cm² Work Test Cubes at 28 days 140 250 335 415 455 500 Slump range (mm) 60-120 60-120 60-120 60-120 60-120 60-120 Water cement ratio (max.) 0.50 0.45 0.42 0.42 0.40 0.38 Minimum cement content kg/m³ 220 300 400 425 435 445 Table 502.02 Requirements of Different Classes of Concrete
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Transcript of Pages From 02b. Specifications-concrete Mix
Improvement and Maintenance of Roads and Minor Infrastructure Projects in and Surrounding Areas of LIWA. STANDARD SPECIFICATIONS – VOLUME 2 Page No. 189/754
SECTION V-2
CONCRETE CLASSES AND MIXES
502.01 Description. The concrete classes and mixes to be incorporated in the Works shall be as specified
herein.
502.02 Concrete Classes.
a. General. Concrete shall have the mix designations and strength requirements indicated in Table 502.02
except for those specifically mentioned elsewhere in these Standard Specifications.
b. Class Requirements. The approximate weights or volumes of the components for each class of concrete
and any other data given in any table of these specifications or the Particular Specifications are as an aid
to the Engineer for suggested trial mix and also will be of value to Tenderers and Contractors in
determining the approximate quantities of components required. However, the minimum crushing
strength of Work Test Cubes at 7 days and 28 days must be strictly adhered to. Acceptance of the work
by the Engineer will be based on 28-day cube strength as determined under Clause 502.06, Testing, of
these Standard Specifications.
Concrete to be used shall include the mix designations and strength requirements indicated in Table
502.02. Method for Testing Concrete, B.S. 1881, shall govern for the manufacture of compressive
strength test cubes for all classes of concrete, except as specified for piles in Section XI, Concrete Pile
Foundations.
Requirements Class of Concrete
K140 K250 K335 K415 K455 K500
Minimum crushing strength
kg/cm²
Preliminary Test Cubes at 7
days
140 250 335 415 455 500
Minimum crushing strength
kg/cm² Work Test
Cubes at 7 days
100 185 250 310 345 375
Minimum crushing strength
kg/cm²
Preliminary Test cubes at 28
days
185 335 445 555 605 665
Minimum crushing strength
kg/cm² Work Test
Cubes at 28 days
140 250 335 415 455 500
Slump range (mm) 60-120 60-120 60-120 60-120 60-120 60-120
Water cement ratio (max.) 0.50 0.45 0.42 0.42 0.40 0.38
Minimum cement content
kg/m³
220 300 400 425 435 445
Table 502.02 Requirements of Different Classes of Concrete
