concreat reciclar em chatt
waterproofing
M4 mortar is actually just concrete, with one part portland and four parts sand, according to BoralWhere as, M1 is just one part hydrated lime and three parts sand (and it's the only entirely lime-based mortar, which should be used for repairs on old buildings that have it, precisely because otherwise you'll have moisture problems) I speculate that the waterproofness of M1 ~ M4 mortar can be ....
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