A concrete block is primarily used as a building material in the construction of walls. It is sometimes called a concrete masonry unit (CMU). A concrete block is one of several precast concrete products used in construction. The term precast refers to the fact that the blocks are formed and hardened before they are brought to the job site. Most concrete blocks have one or more hollow cavities, and their sides may be cast smooth or with a design. In use, concrete blocks are stacked one at a time and held together with fresh concrete mortar to form the desired length and height of the wall.
Concrete mortar was used by the Romans as early as 200 B.C. to bind shaped stones together in the construction of buildings. During the reign of the Roman emperor Caligula, in 37-41 A.D. , small blocks of precast concrete were used as a construction material in the region around present-day Naples, Italy. Much of the concrete technology developed by the Romans was lost after the fall of the Roman Empire in the fifth century. It was not until 1824 that the English stonemason Joseph Aspdin developed portland cement, which became one of the key components of modern concrete.
The concrete commonly used to make concrete blocks is a mixture of powdered portland cement, water, sand, and gravel. This produces a light gray block with a fine surface texture and a high compressive strength. A typical concrete block weighs 38-43 lb (17.2-19.5 kg). In general, the concrete mixture used for blocks has a higher percentage of sand and a lower percentage of gravel and water than the concrete mixtures used for general construction purposes. This produces a very dry, stiff mixture that holds its shape when it is removed from the block mold.
Concrete bricks is one of the modern bricks used for masonry work in the developed countries and many developing countries as tested, qualified, specified, conforming all of the specifications in U.S.A., Canada all European countries, Japan, partly in China, partly in South East Asia, Australia, part of Africa, the then USSR (CIS countries) and in all modern societies. The concrete bricks materials having the following advantages:
- Low cost, accuracy and uniformity of shape which makes lying and bonding easy.
- Smooth surface and light color makes them suitable for internal walls without plaster i.e.; factory units, sheds etc.
- Invariably free from efflorescence.
- Unaffected by repeated freezing or thawing.
- Resistance to fire and the transfer of heat and sound is similar to that of clay bricks.
- Its manufacture uses reusable energy and biogas.
- No harmful residues or emissions are produced.
Considering above, SFCS coupled a good number of professional and technical expertise along with extensive industry knowledge to provide the sustainable total solutions to establish a CC/CLC/AAC Block industry with cost effective manner.