Cement is an indispensable material in the decoration, there are many kinds of strength of cement, pc425 cement and po425, etc., so what are the differences between pc425 cement and po425? Let’s find out in a minute.
First, pc425 cement and po425 difference
po425 cement and pc425 cement are different in raw materials, compressive strength index, preparation and hardening speed:
1, raw materials are different: pc425 belongs to fast hardening cement, referring to composite Portland cement. po42.5 belongs to ordinary cement, which refers to ordinary Portland cement.
2, the compressive strength is different: pc42.5 early strength growth is fast, the three-day compressive strength index is 22.0 mpa. po42.5’s early strength grew slowly, and the three-day compressive strength index was 17.0 mpa, which was worse than po425.
3, the preparation is different: pc42.5 can be matched to the strength of C35 or more concrete. po42.5 can only be made of concrete with a strength less than C35.
4, hardening speed is different: po425 cement hardening speed is faster, pc425 cement hardening speed is slower.
Second, what are the differences between different cement labels
Various types of cement packaging bags have different labels, such as 400, 425, 500 and so on, these numbers represent different meanings and uses. For example, the construction of Bridges and roads must be very strong, requiring the use of high-strength cement. Buildings, factories and the like don’t need high-strength cement. According to the construction of different buildings, different needs, the grade of cement used is not the same.
It represents the compressive capacity and tensile capacity of cement after setting. The higher the cement label, the greater the strength value. The lower the label, the smaller the strength value.
Cement label is closely related to cement setting speed. Some emergency projects and underwater projects, such as sewers, piers and other buildings, need to set time fast cement, you need to use 700, 800 fast hard cement. The wall, ground and other construction projects, the solidification time is not too high requirements, you can choose the slow solidification speed of cement.
