Cement tiles are cement and sand extruded in a certain proportion by machine. The sand should be proportioned with coarse sand and fine sand, and the amount of mud should be less.
The strength of the cement tile should be calculated based on the strength of the cement. Cement strength testing is generally performed at 3 days, 7 days, and 28 days of age, with different inspection standards for each age. Cement is a hydraulic cementitious material. The strength of the cement grows with time. It grows after a certain period of time. Generally, the strength growth stops after one year.
Like silicate 52.5 cement 3d compressive strength is 23Mpa 28d compressive strength is 52.5Mpa 3d flexural strength is 4.0Mpa 28d compressive strength is 7Mpa. You can find this information on Baidu.