Problem Of Bricks

[akram28]

Hi iam from algeria and iam engineer in manufactory of brikcs, we have a problem, when  the brikcs it comes out from kiln he have small cracks of all pill bricks. plz any solution from engineer plz reply my email is : bouziddms@gmail.com

[Tyler Miller]

Add grog to the clay, it sounds like your bricks are drying unevenly--this is especially common in places with high heat and low humidity where clay dries very quickly.  It was a problem in Roman times.  The outside of the brick dries before the interior, so the outside of the brick is under stress, when fired, the stress is relieved by cracking.  

 

Your two options are to dry the bricks more slowly (slowing down production), or adding something like grog, that 1) opens up the clay to allow moisture to wick out more effective and 2) doesn't expand or shrink itself.

 

I'm not an engineer, but from your description, this is what's going on.

[Pres]

Sounds like to me your problem is solved by Tyler. Just in case you are not familiar with the terminology, grog is ground up bisquefired clay. In brick making, it was usually  coarsely ground.\.

 

I have taken the liberty of deleting the second post is the "In the Studio" section.

 

Good luck with your brick making.

[High Bridge Pottery]

I have always wanted to make a brick.

[akram28]

Add grog to the clay, it sounds like your bricks are drying unevenly--this is especially common in places with high heat and low humidity where clay dries very quickly.  It was a problem in Roman times.  The outside of the brick dries before the interior, so the outside of the brick is under stress, when fired, the stress is relieved by cracking.  

 

Your two options are to dry the bricks more slowly (slowing down production), or adding something like grog, that 1) opens up the clay to allow moisture to wick out more effective and 2) doesn't expand or shrink itself.

 

I'm not an engineer, but from your description, this is what's going on.

 

thanks Mr;Tyler Miller for your solution. but i not understand that word (grog) plz more simplification.

[akram28]

Sounds like to me your problem is solved by Tyler. Just in case you are not familiar with the terminology, grog is ground up bisquefired clay. In brick making, it was usually  coarsely ground.\.

 

I have taken the liberty of deleting the second post is the "In the Studio" section.

 

Good luck with your brick making.

thanks Mr.Pres.

[Callie Beller Diesel]

Grog is ground up bits of fired clay. Sand may also work.