Civil Engineering - Building Materials - Discussion

7. 

The cracks which extend from bark towards the sap wood in the cross section of a tree, are called

[A]. radial shakes
[B]. star shakes
[C]. heart shakes
[D]. cup shakes.

Answer: Option B

Explanation:

No answer description available for this question.

Amardeep Singh said: (Nov 4, 2016)  
It Should be Radial Shake.

Swathi Omkaram said: (Feb 19, 2017)  
The answer is star shakes only. Radial shakes extends from pith towards bark. Star shakes extends from bark towards sapwood.

Deepak said: (Aug 5, 2017)  
Star shake generates from bark toward sapwood.

Kripalsinh Zala said: (Feb 3, 2018)  
Please explain other option. What is the other shake generates?

Lakhan Singh said: (Apr 12, 2018)  
It should be heart shake.

Ref: Acording toSK Duggal.

Shubhm said: (Jul 25, 2018)  
Heart shake is the right answer.

Amarjeet said: (Dec 22, 2018)  
Cup shakes are formed due to non-uniform growth of a tree or excessive bending by cyclones or winds. In this case, the shakes develop between annual rings and separate them partly.

Heart shakes, the other type of shakes which develop in maturity approaching trees whose inner part is under shrinkage. The shake spread from pith to sapwood following the directions of medullary rays.

Ring shakes are similar to cup shakes, but they completely separate the annual rings.

Star shakes are formed due to extreme heat or severe frost action. They develop wider cracks on the outside of timber from bark to the sapwood.

Radial shakes are developed radially from pith to the bark.

Nancy said: (Feb 1, 2019)  
Thank you for the explanation @Amarjeet.

Suhail Shafi said: (Jul 20, 2019)  
It should be heart shakes.

Jaby Koay said: (Sep 3, 2019)  
Radial shakes are similar to star shakes, except they are fine, numerous and irregular.

Chandu Nayak said: (Jan 4, 2020)  
It should be heart shake because it starts at the bark and towards the pith. In the other hand, in star shakes starts at pith and crack gets towards the bark.

Girish Reddy said: (Jul 20, 2020)  
Star shakes is the right answer crack from outside (bark) to inside (pith) is star shakes.

Heart shake is from inside (pith) to outside (bark).

Cup shake crackes are formed b/w the annular rings and these cracks seperate the annular rings partially.

Ring shakes similar to cup shakes but the seperation b/w the annular rings is 100%.

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