Question:

Civil Engineering Materials

A project with autoclaved aerated concrete block masonry facade, the autoclaved aerated concrete block after a week after the masonry, the project completed a month later, the wall cracks, try to analyze the reasons and put forward solution.

Answer:

The autoclaved aerated concrete block out of a week after the masonry, GB50203-2017,6.1.3, block age shall not be less than 28 days. Mainly consider the lack of age, is likely to shrink, causing cracks.
Apr 5, 2017
The solution should be emphasized by the design supervision construction unit approved. Rework is a thorough, can be full of points. In the allowable concessions to accept the conditions, you can wire hanging wire. But the effect can not be guaranteed.
Apr 5, 2017
Autoclaved aerated concrete block is characterized by a large drying shrinkage, the kettle after a week that is masonry, is not completely dry caused by shrinkage cracking.
Apr 5, 2017
And other materials, autoclaved aerated concrete block drying shrinkage, moisture expansion. In construction applications, if the drying shrinkage is too large, in the presence of constraints to prevent deformation, the shrinkage of the formation of the stress exceeds the tensile strength or bond strength of the product, products or seams will appear cracks. In order to avoid cracks in the wall, must be in the structure and construction to take certain measures. And strictly control the moisture content of the product when the wall is also extremely important, it is best to control the wall moisture content of 20% or less
Apr 5, 2017

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