Selection Skills of Mengdian Cement for Flooring in Bang Chen

(1) Specific gravity and bulk density: the specific gravity of ordinary cement is 3: 1, and the bulk density is usually 1300 kg/m3.

(2) Fineness: refers to the thickness of cement particles.

The finer the particles, the faster the hardening and the higher the early strength.

(3) Setting time: The time required for cement to start setting after mixing with water is called initial setting time.

The time from adding water and stirring to the completion of coagulation is called the final coagulation time.

The initial setting time of portland cement is not earlier than 45 minutes, and the final setting time is not later than 12 hours.

(4) Strength: The strength of cement should meet the national standards.

(5) Volume stability: refers to the performance of uniform volume change of cement during hardening.

There are many impurities in cement, which will produce uneven deformation.

(6) Hydration heat: The interaction between cement and water will produce exothermic reaction. In the process of cement hardening, the heat released continuously is called hydration heat.