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Wednesday, April 22, 2020

Co-efficients applied to the area measured flat and not grithed (for each side). Painting Work.

Co-efficients applied to the area measured flat and not grithed (for each side). Painting Work.

Description of work : -  coefficient

1) Panelled or framed and braced doors, windows : - 1.3

2) Ledged and battened or ledged, battened and braced, doors, windows etc. : - 1.20

3) Flush doors etc. : - 1.20

4) Part panelled and part glazed doors, orgauzed doors, windows etc. : - 1.00

5) Fully glazed or gauzed doors. windows ete. : - 0.80

6) Fully venetioned or louvered doors, windows ete. : - 1.80
Note: measured overall including chowkhat or frame.

7) Trellis (or Jaffri) work one way or two way. : - 2.00

8) Carved or enriched work. : - 2.00

9) Weather boarding. : - 1.20

10) Wood shingle roofing : - 1.10

11) Boarding with cover fillets and match boarding. : - 1.05

12) Tile and slate battening : - 0.80*
       Steel Work-doors, windows etc.

13) Plain sheeted steel doors or windows. : - 1.10

14) Fully glazed or gauzed steel doors and windows .: -     0.50

15) Partly panelled and partly glazed or gauzed doors or windows. : - 0.80

16) Corrugated sheeted steel doors or windows. : - 1.25

17) Collapsible gates : - 1.50 *

18) Rolling shutters of interlocked laths (excluding top cover). : - 1.10

19) Corrugated iron sheeting on roofs. : - 1.14

20) A. C. comugated sheets : - 1.20

21) A. C. Semi-cormugated sheets. : - 1.10

Note: * For painting all over.

Some important points for the Site Civil Engineer

Some important points for the Site Civil Engineer

Cement mortar should be used within 30 minutes immediately after addition of water. Mortar left unused for two hoursshould be rejected.

Mixing time in mechanical mixture: Concrete: 2 min. Mortar: 1min.

Tolerance on weight for round and square bars worked on the base 0.785 kg/sq. cm of cross sectional area per metre run. Upto and including 8 mm: + 4 percent Over 8 mm: + 2.5 percent.

Weather range for placing concrete 4.5°C to 38°C

Curing time for :
(a)Plain cement concrete -14 days 
(b) Flooring -10 days
(c)Reinforced cement concrete -10 days
(d) Plastering & Pointing -7 days
(d)Brick work & stone work -7 days

Bond stone: At least one bond stone (for wall thickness 60 cm.) or set of bond stones with overlap of 15 cm. (for wall thickness more than 60 cm.) shall be provided for every 0.5 sq m. of wall surface of stone masonry.

Void deducted in Stock Measurements

Voids to be deducted from.stock measurements of 
(A)  Stone metal 40mm gauge and above 7.5%
(B)  Soling stone/boulders 100mm and above 45%
(C)  Excavated rocks 50%

Relation between cube strength and water-cement Ratio

Relation between cube strength and water-cement Ratio by weight for fully compacted concrete (portland cement).

Water cement.           Cube crushing strength         ratio.                               (kg./sq. cm.)
by weight.                     7days.               28days.
0.35                                400                       530
0.40                                350                       470
0.45                                300                       420
0.50                                250                       370
0.55                                220                       320
0.60                                180                       280
0.65                                150                       250
0.70                                130                       220
0.75                                110                       200
0.80                                105                       180

** Volume of one bag of cement is 0.0347 cum.
** Measuring box to be used at site (Size 35 x 25 x 40 cm.)

Approximate percentage strengths of concrete with age.

Approximate percentages of strength of ordinary portland cement concrete at different ages in comparison with the strength at 28 days.

Age:                       Strength (percent)
01 day.                          16
03 days.                        40
07 days.                        67
28 days.                       100
03 months.                  122 
06 months.                  144
12 months.                  155

Time period required for removal of formwork shutters and supports.

Removal of formwork:

(A)    Sides of foundations, columns, beams and walls is 02 day's.
(B)    Under sides of slabs up to 4.5m span is 07 days.
(C)    Under sides of slabs above 4.5m span and Under sides of beams and arches up to 6.0m span is 14 days.
(D)    Under sides of beam and arches up to 6.0m span and up to 9.0m span is 21 days.
(E)    Under side of beams and arches over 9.0m span is 28 days.

Note: For rapid hardening cement 3/7 of above period except the vertical sides of slabs etc should be retained for atleast 24 hrs. Cantelivers should be provided with counteracting loads before removal of formwork.

Reduction in strength of concrete made with stored cement.

Period of storage of     Approx. relative stren-
Cement in Months.       gth at 28 days in %

           0 days.                           100%
           3 days.                             80%
           6 days.                             70%
         12 days.                             60%
         24 days.                             50%

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