❇️ In the construction industry, in general, block beams are among the most widely used and common types of structures for building roofs. In this type of roofs, concrete beams are used (in the form of placing clay or cement blocks between these beams).
❇️ It can be said that the concrete beam is actually the most important and vital part of the block beam roofs. On the other hand, concrete has a high compressive strength and easily tolerates high pressures, but it does not have good tensile strength, and this defect is solved by placing concrete next to steel and rebar, because steel has high tensile strength. Finally, it can be said that with the combination of these products, the human need to build towers and high structures has been solved. Beams have different types. For example, based on a type of classification, joists are divided into two categories:
💎 Joists with a permanent mold or a shoe shoed beam (clay)
💎 Joists without a permanent mold (concrete) or metal)
❇️Concrete beams are also included in the category of beams without a permanent mold, which are again divided into two groups, which are as follows:
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💥 Pre-tensioned beam