Portland cement 4 Tehran cement

Cement is a hydraulic binder, in other words, cement is an inorganic powder material, which, when mixed with paste water, is absorbed during hydration reactions and processes, and even after its hardening, strength and stability. Preserves in water. One of the most important synthetic hydraulic cements is Portland cement.

One of the most important synthetic hydraulic cements is Portland cement. Portland cement is a by-product of mixing limestone and clay by a weight ratio of about 3: 1 to 4: 1 (depending on their chemical composition), grinding the mixture in wet or dry ways, homogenizing raw materials, cooking materials In the furnace up to the border of sweating the grains surface and gluing them together in the form of boiling or clinker, cooling and grinding the clinker with a bit of gypsum is achieved.

The main use of this type of cement is in large concrete buildings. In large buildings, such as concrete dams, due to the high volume of concrete, the increase in temperature due to concrete blockage can be very dangerous. To keep the cement temperature low, type 4 cement is also called late retention cement.