Determination of Dry density of soils in place by the core-cutter method

 

Determination of Dry density of soils in place by the core-cutter method

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IS code for this test-2720 (Part-29)

Note:-

Sl. No.	IS Code	Part No.	Description
1	2720	28	Determination of dry density of soils in place by the sand replacement method
2	2720	33	Determination of the density in place by the ring and water replacement method
3	2720	34	Determination of density of soil in place by the rubber-ballon method

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Apparatus required for this test:-

      (1.)  Cylindrical Core-Cutter:-

Height=130 mm

Internal Diameter=100 mm

External Diameter=103 mm

Wall Thickness=3 mm

The cutter shall be kept properly greased or oiled.

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Also Read:Important one liner questions with their answers, Part-11

(2.) Steel Dolly:-

Height=25 mm

Internal Diameter=100 mm

Wall thickness=7.5 mm

Note:-Tolerances on all essential dimensions shall be +-0.25 mm.

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(3.) Steel Rammer:-

(i) Solid mild steel foot with 140 mm diameter.

(ii) 75 mm height with a concentrically screwed 25 mm diameter solid mild steel staff.

(iii) The overall length of the rammer including the foot as well as the staff should be approximately 900 mm.

(iv) The rammer (foot and staff together)should weight approximately 9 Kg.

(4.) Weight balance which is accurate to 1 Kg.

(5.) Palette Knife, whose length=20 cm and width=3 cm

(6.) Steel Rule/Steel Scale

(7.) Pick Axe/Spade/Grafting Tool

(8.) Straight Edge:-A steel strip about 30 cm long, 2.5 cm wide and 3 to 5 mm thick, which one bevelled edge will be suitable.

Also Read:Important one liner questions with their answers, Part-10

Test Procedure:-

(1.) Before starting this test, MDD (Maximum Dry Density) and OMC (Optimum Moisture Content) is required.

(2.) Select the location where test will be done.

(3.) In a single layer, mark 3 locations and it will be in zig-zag location not in a straight line.

(4.) One-by-one core is inserted in ground through the rammer.

(5.) The thickness of each compacted layer will be 150 mm to 200 mm or as mentioned in the Contract document/Technical specification/FQP.

(6.) We have removed out the core from the ground and separate their collar from the core.

 (7.) Must determine during the core was outed from the ground, the core’s soil should not disturb.

(8.) Now, core is cleaned surrounding areas and both ends of core is make plane and equal level through knife.

(9.) Filled the format with required data, which is obtained through test. (Format is also mentioned in the IS:2720,Part-29)

(10.) Now, get the result. The result of compaction will minimum 95% of average of three cores in each layer.

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Written By-

Ritesh Raj

Email Id-rajritesh.motiharirr@gmail.com