Recent content by Johnson

Strength shrinkage may be caused by excessive cement content.

A severe defect in the production process of wet-mixed mortar is that the raw material sand cannot be processed! It is difficult to maintain its mud content and particle grading stable if using the wet river sand. This requires regular sampling testing of incoming raw sand and adjusting the mix...

Can't stir for a long time, add water faster, or the density is not enough.

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 is best to consider liquid wet-mixed admixtures which is actually simpler than dry-mixed.

I think it was because of the use of fly ash, which was caused by gypsum in the fly ash.

Since there is no formula, Guess 1: The ratio of powder and aggregate is wrong. The aggregate grading is terrible. The cement added less. The aggregate needs to be fixed. Guess 2: Used the wrong cellulose ether, or it was fake. Guess 3: The mixing is uneven, and the water is less. Guess...

The main point is to control the grading of sand. Plastering cement is best to use 32.5