Type 3 Portland cement

Because this cement has a very high hydration rate, it is also known as quick-setting cement. This cement is used for construction works with limited opportunities. Because in addition to its fast setting speed, it also has relatively high resistance after hardening. In addition, the use of this cement is very practical in cold areas, because it produces heat after hardening, which will make the building environment warmer, and it can be easily applied using a cement sprayer.

Portland cement type 4

Type 4 is one type of Portland cement used in the construction of large structures such as dams and bridges. This type, which is also known as low-temperature cement, gains little heat during use. This makes it useful for use in very hot areas or for building structures that are exposed to heat. The hydration speed of type 4 cement is low, and therefore its setting will be very slow. Portland cement type 5

This type of cement has a very good resistance to the attack of sulfates, and for this reason, it will be very useful in areas where the water or soil has a lot of sulfates. Note that type 5 Portland cement has little resistance, and therefore it cannot be used to build resistant structures or structures that bear a lot of load.

2- Mixed cement

Mixed cement is one of the types of construction cement that is combined with different materials to have better physical properties. The combination of pozzolan, lime and mortar with cement produces various types of mixed cement, which we will explain below. Pozzolanic portland cement Pozzolan is a material obtained from silicate, which has a structure similar to cement. The combination of pozzolan with Portland cement forms this type of blended cement. In the pozzolanic type of mixed cement, pozzolan constitutes 15% of the total cement. Low temperature, resistance to sulfate and other corrosive solutions and proper hydration speed are the characteristics of this cement. Due to these features, it is used in tropical areas for massive concrete pouring. In the table below, the advantages and disadvantages of pozzolan cement have been examined. Advantages:

Help to increase the strength of concrete It has a dense state and is resistant to chemicals impenetrable Resistant to freezing Reducing the possibility of concrete surface cracking Reducing the volume of concreting Reducing the amount of cement needed to produce concrete Protection of rebars against corrosive agents

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