These types of concretes are used in the construction of fence and walls. Solid concretes are totally solid and weighs more than the hollow concrete units. Full sized concretes are rectangle in shape and the half sized is cubical. These hollows in the concrete help the water pipe and electrical wires to run through them. This also makes them more feasible to lift. One or more hollow cores are made inside the hollow concrete units which helps them to maintain a reduced cross sectional area over less weightage up to 25 percent. PPC, hardening Portland cement are some of the materials used to construct concrete unit blocks. Apart from the nominal blocks a wide range of special shaped concrete blocks are designed for various purpose. Concrete blocks with the size range of 40cm length and 20cm height. Concrete block units are designed with various types and strength based on the usage. Many types of concrete blocks are manufactured namely normal insulated, thermal insulated, light weight blocks, normal weight concrete, hollow concrete, solid units, hourdi blocks, window or doors concrete, lintels and pathway blocks and many more. It is a fact that they are made and hardened before they are used in the building construction. Solid concrete blocks are the more commonly used and they provide strength and stability to the structure.Д¬oncrete Units or blocks are the most widely used building material to form a wall or a fence. Concrete blocks are made in different shapes and sizes and they may be hollow or solid. Concrete blocks are produced by mixing cement mixes with various types of aggregate such as gravel, sand, crushed stone, air cooled slag, coal cinders, clay, volcanic cinders and pumice. Concrete blocks are one of the precast concrete products that are used in the construction industry.

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