The main reasons for the ash formation of cement products are: inadequate health care, poor labeling and cement failure.

In the process of cement solidification, it will absorb a lot of water, so it should be kept moist so that its hydration can continuously improve the strength of cement products. During the 7-day curing period, the cement becomes powder, that is, gray due to lack of water. If the cement grade is low, the mortar mix ratio is wrong, or the cement fails when it is wet, there will be similar situations. The reason why the floor gets wet during curing is that the mortar surface is diluted, which reduces its strength and is alkaline and volatile. The strength of the main body does not change much, but it affects beauty and hygiene.