The more low the solution mark in a laying, the is easier it is compressed and, hence, the the more general deformations of a laying, and in each brick - pressure of a bend and a cut. Therefore, to receive stronger laying, apply accordingly a solution of higher mark.
However increase of durability of a solution slightly increases durability of a laying. Much bigger value has plasticity of a solution. Plastic solutions are better spread on brick bed, providing a uniform thickness and seam density. It raises durability of a laying at the expense of reduction of pressure of a bend and a cut in separate bricks.
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