Why Does Mortar Crack When Drying?

The strength of mortar is mainly derived from the cementitious material. If the cement content is too high according to the strength grade, it will hydrate too quickly. If not cured in time, it will cause shrinkage, hollowing, and cracking.

Why Does Mortar Crack When Drying?

Mortar cracking is a common problem many homeowners, builders, and contractors face when doing masonry work. It can be a source of frustration and can lead to costly repairs. But why does mortar crack when it is drying?

The most common cause of mortar cracking is improper mixing of the ingredients. If the mix is too wet or dry, it will create too much or too little pressure in the mortar, leading to cracking. Additionally, suppose the mortar is not mixed properly. In that case, the binding agents cannot form correctly, and the artillery cannot adhere to the surfaces it is being applied to properly.

Another common cause of cracking is temperature. If the temperature is too hot or too cold, the mortar will not set correctly and can lead to cracking. The same is valid for humidity. If the humidity is too high, the cannon can dry too quickly, causing it to crack.

Finally, mortar cracking can be caused by improper joint preparation. If the surface is not prepared correctly before the mortar is applied, the artillery will not be able to adhere perfectly and will crack. This is especially true for vertical surfaces, where gravity will cause the mortar to shift and crack.

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