Important Points SOP (Standard Operating Procedure) During the Inspection of RCC NP4 Pipes

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Image
Important Points SOP (Standard Operating Procedure) During the Inspection of RCC NP4 Pipes: -    Image-Hydro Test (Photo Credit: Ritesh Raj) (1.) Firstly, approved QAP will be checked.  (2.) ID marks should be marked on the inner and outer sides of pipes.  Image-ID Mark (Photo Credit: Ritesh Raj)  (3.) To check the inner and outer diameter of pipes.   (4.) Smooth finishing and before dispatch of RCC pipes cement slurry or grouting where required.   (5.) Load test is required for RCC pipes as per IS codes. It is different for each dia, of RCC pipes.  Image-Plate Load Test (Photo Credit: Ritesh Raj)   (6.) Concrete mix design checked and in which cement content, cement brand, and water-cement ratio should be checked.  (7.) The straightness test to be checked of RCC pipes through the straightness rods to collinear visible.   (8.) As per requirement 2% of hydro tests are to be checked as IS:458 of the total ordered quantity.  Image-Hydro Test (Pressure Release) (Photo Credit: Ritesh Raj)  
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Elongation Test of an Aggregate

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Elongation test is an important test of an aggregate. Because, aggregate is an important ingredient of concrete. Aggregate is how much elongated, it will acceptable or not as per their acceptance criteria, it will known by elongation test. I am representing here elongation test of an aggregate.

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Elongation Index:-If aggregate least dimension is greater than 4/5th or 0.8 times its mean dimension, then it is called elongated.

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Recent Post:Flakiness Test of an Aggregate

Used IS Sieve:-

25 mm

20 mm

16 mm

12.5 mm

10 mm

6.3 mm

Also Read:Civil engineering related important questions with their answers

Teat Procedure:-

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(i) The aggregate of 200 pieces which is kept separately.

(ii) Now, weight of 200 pieces and suppose weight=2187 gm. Then it will mention in the format.

(iii) Elongation gauge will kept on a pan.Which aggregate will pass through this gauge, will fall fall in the bottom pan and whichever is not passes, will kept in separate pan/lid.

(iv) Passing range will be 20 to 16 mm. We will consider that longest/largest part of the aggregate will passes front. Same type we will check 200 nos.

Also Read:Important terms on the basis of IS codes

(v) Retaining aggregate i.e. which was not passed, taken weight and note in format.Now weight=266 gm (retained particle)

(vi) Now, we will continuing this testing of each sieve retaining aggregate.  


Format (Example):-

Passing through IS Sieve          (in mm)

Retained through IS Sieve                (in mm)

Wt. of fraction consisting of at least 200 pieces

Length of gauge size (0.8 times the mean sieve)

Wt. of aggregate in each fraction passing through the thickness gauge

63

50

w1=

101.7

m1

50

40

w2=

81

m2

40

31.5

w3=

64.5

m3

31.5

25

w4=

48.8

m4

25

20

w5=

40.5

m5

20

16

w6=2187

32.4

m6=266

16

12.5

w7=1964

25.7

m7=173

12.5

10

w8=1010

20.3

m8=85

10

6.3

w9=474

14.7

m9=93

Total

W=5635

M=617

As per IS code 383:2016, page no.-3, clause no.-5.3, the combined flakiness and elongation index so obtained shall not exceed 40 percent for uncrushed or crushed aggregate.

Also Read:Determination of dry density of soil in place by core-cutter method



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Written By-
Ritesh Raj

Email Id-rajritesh.motiharirr@gmail.com



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