Adding glue has no waterproof effect, but only increases the degree of adhesion, but the side effect is to reduce the label. Glued cement is generally used to scrape some sandy ground. If there is a gap somewhere, scraping the cement slurry in can also prevent leakage. When cement is mixed with water, gypsum hemihydrate quickly reacts with water to form gypsum dihydrate, forming a needle-like crystal network structure, which makes the cement slurry solidify.

In addition, some cement with high alkali content, potassium sulfate and gypsum dihydrate produce potassium gypsum, which grows rapidly and also causes false coagulation. False coagulation is different from rapid coagulation, the former has less heat release, and the slurry can recover plasticity and reach normal coagulation after intense stirring, which has no adverse effect on strength.