header-photo

Examples of Standard Specification

STANDARD SPECIFICATION FOR SURKI MORTAR

         1. Surki mortar shall consist of lime, surki and sand each complying with its respective standard specification, mixed in the proportions noted below, or such other proportions as may be defined I the relevant schedule item for the various items of work.


Item of work

Lime

Surki

Sand

i.   Concrete

1

½

1 ½

ii.  Masonry (Brick or Stone)

1

½

1 ½

iii. Plastering – First Coat
Plastering – Second Coat

1
1

½
½

1 ½
1

iv.  Pointing

1

½

1

2. Surki mortar is included in lime mortar specifications and relevant portions in I.S.1625/1971 and I.S.2394/1965 shall apply.

STANDARD SPECIFICATION FOR CEMENT CONCRETE

1. I.S. 456-1978, I.S. 383-1970 and I.S. 269-1989 shall also apply.
2. Mixing concrete – Cement and sand shall be measured in accurate proportions, and well mixed in a dry state, thrice over, on a clean dry platform of wood or slabs with tight and even joints, so that there may be no wastage of mortar, or difficulty in mixing.  As much quantity of the aggregate, washed and cleaned of dirt and allowed to dry, as can be mixed and laid with in 15 to 20 minutes after water is added to the mixture, shall then be laid on the dry platform and on it shall be spread the dry mixture of cement and sand in correct proportions.  The cement is to be weighed, 50 kg being taken as 35 liters, and measuring boxes are to be used to maintain the correct proportions of sand and broken stone.  A convenient size of measuring box would be of inside dimensions of 40 cm long, 35 cm wide and 25 cm deep.  The mixing platform should be large enough to enable the continuous procedure of two batches being mixed avoid partial sets of the concrete between laying of successive batches.  The whole mass shall then be thoroughly mixed with a shovel, turning over atleast three times, and adding sufficient quantity of water with a sprinkling can, until the colour of the cement is uniformly distributed throughout the whole mass.
The whole operation shall be so arranged as to take the minimum time possible, so that the mixed concrete shall be placed in position before initial setting begins.  Concrete which had begun to set, or which has been condemned by the executing engineer shall be rejected and removed from the work spot.
3. For water for mixing, setting time, laying and machine mixing of concrete I.S.456-1978 and I.S.269-1989 shall apply.
4. Rate – The contract rates are to include the cost of mixing, conveying, placing, ramming, watering, barrows, tools and all appliances required to complete the concrete in position.  They shall also include the cost of bailing pumping for keeping the excavation free of water, unless otherwise specified.  Centering shall be measured and paid separately.
5. Quantities – The standard data for the dividion is to be follwed for the quantities of material and labour required for the various items of work.  The relevant schedule item will define the proportions of cement to sand ie., whether 1:2 or 1:3 etc.,

STANDARD SPECIFICATION FOR REINFORCEMENT

            The reinforcement shall be any of the following:

    1. Mild steel and medium tensile steel bars confirming to IS:432(Part 1) 1982.
    2. High strength deformed steel bars confirming to IS 1786 – 1985.
    3. Hard drawn steel wire fabric confirming to IS 1566 – 1982.
    4. Structural steel confirming grade A of IS 2062 – 1992.

`All reinforcement shall be free from loose mill scales, loose rust and costs of paints, oil mud or other coating which may destroy or reduce bond.
The modulus of elasticity of steel shall be taken as 200 kN/mm2.
The storage of steel shall be as described in IS:4082-1972.
The examples given for general, detail and standard specifications are only few samples to explain the different types of specifications. A model list of specifications, which is used for a common building is given below with method of measurement.

DRAFT MODEL FOR THE SPECIFICATIONS OF DETAILED ESTIMATE

            

1.

Earth work excavation in all soils for foundation with initial lead of 10 m and initial lift of 2 m including refilling the foundation with excavated earth and spreading the excess earth within the premises, etc complete.  

2.

Supplying and filling with clean river sand for foundation including consolidation in layers of not more than 15 cm thick, etc. complete.

3.

Cement Concrete 1:5:10 (One part of Cement, five parts of sand and 10 parts of coarse aggregates) using 40 mm HBG stone jelly for leveling coarse and foundation, etc. complete.

4.

Cement concrete 1:2:4 (one part of cement, 2 parts of sand and 4 parts of aggregates) using 20 mm HBG stone jelly for reinforced cement concrete works including cost of centering, shuttering the sides and soffits, laying, finishing, curing etc. complete.

  1. For Foundation
  2. For Grade Beams
  3. For Lintel
  4. For Roof Slabs
  5. For Sun Shades
  6. For Columns
  7. For Vertical Facia Slabs, etc.

5.

Brick work in cement mortar 1:5 (One cement and five sand) using best quality chamber burnt country bricks including laying, finishing, curing, etc. complete.

  1. For Foundation and Basement
  2. For Ground Floor
  3. For First Floor
  4. For Second Floor
  5. For Third Floor

6.

Supplying and fabrication of steel rods including cutting, bending, tying and fixing in position including cost of binding wire, etc. complete.

 

  1. For Foundation
  2. For Grade Beam
  3. For Lintel
  4. For Roof Slabs
  5. For Sun Shades
  6. Foe Columns
  7. Foe Vertical Facia Slabs etc.

7.

Brick partition walls of 4½’’ thick using best quality chamber burnt country bricks in cement mortar 1:4 (one cement and four sand) with hoop iron reinforcement including laying, finishing, etc. complete. 

8.

Supplying and manufacturing of country wood joineries for doors, windows and ventilators using 4’’ x 3’’ scantlings for frames and  40 mm thick Planks for shutters are including cost of wood, manufacturing charges, clamps and other furniture fittings etc. complete.

9.

Supplying of M.S. grills including cost of flats and angle sections welding charges, etc. (design as approved by the engineering authorities) complete.

10.

Weathering coarse concrete over roof slab using 20 mm gauge broken brick jelly and lime, the proportion between the brick jelly and lime is 32:12:5 including cost of laying to proper gradient etc. complete.

11.

Finishing the top of roof with one coarse of flat tiles of 25 x 25 x 2 cm size laid in cm 1:4 mixed with 2 percent of water proofing compound and the joints pointed with same coloured mortar including coat of laying, finishing, curing etc. complete.

12.

Plastering with cement mortar 1:3 (one cement three sand) for exposed surface of RCC items – 12 mm thick.

13.

Plastering with cement mortar 1:5 (one cement and five sand) for sides of wall structures 12 mm thick.

14.

Finishing the flooring with cement mortar 1:3 (one cemet three sand) – 19 mm thick.

15.

Finishing the flooring with 1 coarse of ceramic tiles of 25 mm thick including cost of laying finishing and polishing the floors, etc. complete. 

16.

White washing three coats with best quality shell lime for ceilings.

17.

White washing one coat and colour washing two coats best quality cement paint including curing for wall structures.

18.

Painting two coats with synthetic enamel paint over a priming coat for wooden joineries including cost of paints labour charges etc., complete.

19.

Painting of two coats with synthetic enamel paint over a priming coat for steel work including cost of paints labour charges etc., complete.

20.

Provision for internal and external sanitary arrangements.

21.

Provision for internal and external water supply arrangements.