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

-
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...
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Specific Gravity And Water Absorption of Coarse Aggregate

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 Specific Gravity And Water Absorption of Coarse Aggregate

Coarse Aggregate (Image Source: Pexels.com)



Apparatus Required:-

(1.) Weighing Balance of capacity not less than 5 kg.

(2.) A thermostatically controlled oven'

(3.) Glass vessel of sufficient capacity

(4.) Air tight container

(5.) 10 mm IS sieve

(6.) Sample under test

(7.) Observation Sheet

Recent Blog: Water Absorption Test of Brick 

Procedure of Test:-

(1) To start the experiment, take 1 kg of coarse aggregate in its natural state. Record the reading in the observation sheet.

(2.) Now, sieve the sample through 10 mm IS sieve to remove the finer particle.

(3.) Separate the sieve (retaining particle) sample in the glass vessel.

(4.) Partly fill the vessel with distilled water.(i.e. water is filled more than aggregate level)

(5.) Keep the aggregate immerse for 24 hours so that they are completely submerged and glass vessel will covered through their cover.

(6.) Vessel is interrupted (i.e. shaken) so that air will remove.

(7.) Sometimes the vessel is overfilled with water up to top of the jar. Vessel will covered through cover and ensure that it will air tight.

Also Read: Compressive Strength of Brick

(8.) The vessel is then dried from outside through cotton.

(9.) It will kept on balance and take the weight of assembly and note this reading in observation sheet(A). A=3372 gm

(10.) The vessel is now emptied and the aggregate allowed to drain out.(No any aggregate will fall in another vessel, other water will fall)

(11.) The aggregate are then placed on a dry cloth till it comes in surface dry condition.

Also Read: Fineness Test of Cement

(12.) Refilled the vessel through distilled water only. It will ensure that no air entrapped here.

(13.) Weight the entire assembly. Record the reading on the observation sheet, which is (B).B=2754 gm

(14.) When the aggregate will be in surface dry condition, their weight will taken. Weight=990 gm (i.e C)

(15.) Now, aggregate is placed in a tray and kept in oven at 1000c for 24 hours.

(16.) After 24 hours the aggregate is taken from oven and cooled in a air tight container.

(17.) Note down the oven dried weight of aggregate (D).D=982 gm

Also Read: Final Setting Time of Cement

Specific Gravity:-

Specific gravity can be defined as the ratio of the weight of aggregate in air to the weight of aggregate in air to the weight of equal volume of water displaced by saturated surface dry aggregate.

Specific Gravity of Coarse Aggregate=D/C-(A-B)

Where,

D=Weight of oven dried sample

   =982 gm

C=Weight of saturated surface dry sample 

   =990 gm

A=Weight of sample+ vessel +Water

   =3372 gm

B=Weight of vessel +water

   =2754 gm

Specific gravity of coarse aggregate=982/990-(3372-24754)

                                                          = 2.64

Also Read: Methodology for trenchless piping by jack pushing method 

Note:-

Apparent specific gravity=D/D-(A-B)

                                         = 982/982-(3372-2754)

                                         = 2.70

Now, water absorption of coarse aggregate=(C-D/D)*100

                                                                     =(990-982)*100

                                                                      =0.81 %

(18.) Repeat the test for another sample of aggregate and record the reading in observation sheet.

(19.) The average of two results is taken for final result.

Note:-

Majority of specific gravity lies between 2.6 to 2.9

(20.) Format is showing below:-

Determination of Specific Gravity and Water Absorption

Sl. No.

Description

Sample No.

         I  

II

a.

Weight of Sample, g

1000

1000

b.

Weight of vessel +Sample+ water (A),     g

3372

3374

c.

Weight of vessel+ water (B),  g

2754

2754

d.

Weight of saturated and surface dry sample(C), g

990

992

e.

Weight of oven dry sample (D),  g

982

982

f.

Specific Gravity=(D/C-(A-B))*100

2.64

2.64

g.

Apparent Specific Gravity =(D/D-(A-B))*100

2.70

2.70

h

Water Absorption, percentage dry weight           =((C-D)/D)*100

0.81

0.81

Average Values

Specific Gravity

2.645

Apparatus Specific Gravity

2.7

Water Absorption

0.81%


Watch: https://www.youtube.com/watch?v=hqXFPq676iM (Source:NCTEL)




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Written By-
Ritesh Raj

Email Id-rajritesh.motiharirr@gmail.com




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