When you are building up a rate for concrete work for a particular tender, it is important to refer the preamble notes prior to the pricing.
examples:-
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All concrete works shall comply to the specifications, filled into formwork and well packed around reinforcement. |
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All concrete works shall be Grade 30 ready mix unless otherwise specified in the drawings and specifications. |
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All lean concrete works shall be Grade 15 as specified in the drawings and specifications. |
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Contractor shall not cause any damage direct or consequential to the new structure during carrying out the work detailed in "Concrete Work" trade and he at his own expense, make good any damage caused to them, arising directly and/or indirectly out of his fault and/ or negligence and/or failure to take precautionary measures to avoid such damage. |
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All Reinforcement unless otherwise specified shall be rod reinforcement and free from rust, mill scale, dirt, grease, or any other substance organic and/or giving specified strengths intended by the Engineer. |
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Rate for concreting columns, walls shall include for kickers. |
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Measurement of Slabs & Walls. |
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Slab concrete include that part of beam to a depth of largest adjacent slab thickness. |
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Concrete work for slabs and walls have been categorized according to their thickness as followings: |
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a. not exceeding 150 mm |
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b. between 150 mm and 300 mm |
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c. exceeding 300mm |
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Measurement of Columns & Beams |
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Concrete work for columns have been categorized according to their cross sectional areas as follows: |
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a. not exceeding 0.10 m2 |
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b. exceeding 0.10 m2 |
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Concrete work for beams have been categorized to their cross sectional areas from lowest adjacent soffit of slabs as follows: |
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a. not exceeding 0.10 m2 |
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b. exceeding 0.10 m2 |
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Concrete work related to Ramps has been measured separately and slopes have not been indicated. Slopes shall be as shown in the drawings. (approximate slope is 1:10 ) |
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Contractor shall ensure that all contacting surfaces including reinforcement dowels left out for bonding purposes is free from any organic or artificial material which can be a hindrance to achieve specified properties in the Drawings and Specifications. |
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Wherever work has been categorized according to the thickness, slope, cross sectional area, height etc., the upper limit shall be include in the same category. Example walls between 150mm and 300mm thick shall include walls exceeding 150mm in thickness up to and including 300mm in thickness. Walls having 150mm thickness included in walls not exceeding 150mm thick category. |
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Rates for lean concrete shall include for preparation of bottom of excavation prior to pouring of lean concrete. |
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Contractor shall ensure that the top of the lean concrete layer shall be finished semi rough to receive waterproofing layer where applicable. |
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Rates for formwork shall include for control joints, isolation joints wherever specified and required according to the drawings and specifications. |
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All concrete shall be ready mix unless obtain approval for the Engineer to use site mix in special areas. Mix design of ready mix concrete shall be approved by the Engineer and the Contractor shall submit detail of his ready mix supplier, mix design calculation past tests report, sieve reports and other technical information. |
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Rate of concrete for floor slabs shall include for sand trowel finish to slab surface wherever specified to the satisfaction of the Engineer. |
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Rates for concrete shall include all necessary tests by an institute/Authority acceptable to the Engineer. |
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All concrete shall be ready mix unless allowed by the Engineer. |
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All concrete shall be ready mix unless obtain approval for the Engineer to use site mix in special areas. Mix design of ready mix concrete shall be approved by the Engineer and the Contractor shall submit detail of his ready mix supplier, mix design calculation past tests report, sieve reports and other technical information. |
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Rate of concrete for floor slabs shall include for sand trowel finish to slab surface wherever specified to the satisfaction of the Engineer. |
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Rates for concrete shall include all necessary tests by an institute/Authority acceptable to the Engineer. |
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All concrete shall be ready mix unless allowed by the Engineer.
| Rates for lean concrete shall include for preparation of bottom of excavation prior to pouring of lean concrete. |
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| Contractor shall ensure that the top of the lean concrete layer shall be finished semi rough to receive waterproofing layer where applicable. |
The estimator or the quantity surveyor must read all the above and should include necessary expenses for the above requirements.
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