The compressive strength is the same, and applying on the wall is fine, but only the mortar on most of the test pieces is easy to fall off under the normal maintenance condition, and the 14d will fall off with a slight break. I am still determining the specific reason.
It will shrink if the cement content is too high. However, I guess adding too much cement to the wet-mixed mortar is impossible since the cost cannot bear it. It may be that you using too much retarder.
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