Sometimes, after the finished foam concrete blocks have been lying for a while from a month to a year or longer, small cracks on foam concrete blocks become visible. In most cases, the reason is not in bad materials or non-compliance with casting technology. And certainly not in the machinery for the foam concrete blocks manufacturing. The reason is that all cement-containing products require a certain period and a drying regime after production. Whatever the cracks do not appear blocks, it is necessary to create conditions for hardening and appropriate storage conditions at which the foam matures.
Cause of crack on foam concrete blocks
The reason for the crack on foam concrete blocks in most cases is too hasty and uneven in depth blocks drying process. Make sure that the reason is exactly this, if you consider the blocks that were stored in the depth, behind the top or the first storage layer on pallet. If there are no cracks on them, then the reason is with a high degree of probability in the wrong mode of drying and/or solidification. Too fast drying and weathering of foam concrete blocks surfaces – is the main cause of the appearance of shrinkage cracks.
How to avoid the appearance of a cracks
First We recommend a drying time of 24 days. After stacking blocks on a pallet or flooring for storage it is recommended to wrap them with polyethylene film or stretch to ensure that the moisture from them leaves slowly and the surface is not aired by draft or wind. By wrapping blocks with skin, you retain the vintage strength and get rid of the shrinkage cracks. In order for the blocks to become marketable, you can make holes in the film 10 days later using a construction roller. After that, the moisture will exit faster and the blocks will assume a uniform color. Also, before coating the film, it is possible to additionally spray or pour blocks with water. Especially if the air temperature in the storage place is above 25 ℃.