Thursday, November 30, 2023

Dynamic Cone Penetration Test ( DCP Test) : Apparatus, Lab Procedure & Precautions of DCP Test

- Advertisement -
- Advertisement -


This article will discuss the Dynamic Cone Penetration Test, its lab procedure and precautions.

Highway pavements are essential to the transportation system, providing access and establishing linkages worldwide.

Due to its utmost(greatest) importance, there has been a need to construct structurally sound highways and facilitate the easy and comfortable movement of traffic.

The stability and quality of roads are thus checked by several tests.

Among the tests, the Dynamic Cone Penetration Test is one.

The Dynamic Cone Penetration Test is a test carried out to check the structural properties of existing pavements. It was developed by Transport and Road Research Laboratory in England.

It is also called as DCP Test.





  1. Apparatus Required  

DCP Apparatus:
The dynamic cone penetration test apparatus consists of a steel rod with a 60-degree conical tip. The rod is further topped by an anvil which is further connected to a steel rod.

This rod guides the hammer to be raised and dropped from a height of about 575 mm.


Dynamic Cone Penetration Test



  2. Procedure of Dynamic Cone Penetration Test (DCP Test)  

1. The test apparatus is first assembled. After assembling, the apparatus’s initial reading( zero reading) is recorded. This is done by standing the apparatus on a hard surface such as concrete, checking that it is vertical, and then entering zero.

2. The instrument is then held vertically, and the weight is carefully raised to the handle. It must be ensured that the weight is touching the handle.

3. The readings are then noted at an increment of about 10mm. This step is carried out by dropping the weight above the pavement.

4. After completing the DCP test, the penetrometer is gently removed by tapping the weight against the handle. This process should be done with great care. Otherwise, it may result in damage to the instrument.





  3. Correlations to Engineering Parameters  



log(DPI) = -1.05 + 2.03 * log(SPT)


  • CBR = California Bearing Ratio
  • DPI = DCP Penetration Index
  • SPT = Standard Penetration Test (ASTM D 1586-64)





  4. Precautions in DCP Test  

a. Removal of the penetrometer should be done with great care while taken out after the test.

b. Reading must be taken carefully.




  5. References  

1. Content Filter & Authenticity Checking Team, Dream Civil International

(Our team checks every content & detail to maintain quality.)




Read Also: Plastic Limit Test


How useful was this post?

Click on a star to rate it!

Average rating 5 / 5. Vote count: 2

No votes so far! Be the first to rate this post.

We are sorry that this post was not useful for you!

Let us improve this post!

Tell us how we can improve this post?

- Advertisement -
Er. Madhu Krishna Poudel ( Founder )
Er. Madhu Krishna Poudel ( Founder )
Madhu Krishana Poudel is a distinguished Civil Engineer with extensive experience in site supervision, estimation, and AutoCAD 2D and 3D design. Holding a Bachelor's degree in Civil Engineering from Pokhara University, his work and expertise have earned recognition in reputable sources such as USA Today, Time, Wikipedia, and TheRichest, establishing his credibility and trustworthiness in the construction industry.
Latest Articles
Related Articles
Dream Civil Is Under Updatespot_img