Hollow blocks are often used to build large structures like boundary fences. The reduced volume of concrete used to make each block adds up to a significant savings in cost for the materials for the whole wall. Their lighter weight also makes them easier to lift.
Concrete blocks are a prefabricated material mainly used to build walls. Like bricks, the blocks are stacked together and joined with a mortar, usually consisting of cement, sand, and water. The blocks are hollow inside to allow for steel bars and mortar filling.
Fly Ash Bricks
Fly ash bricks are hi-tech well-improved quality bricks used for construction of brick masonry structures. They are used as replacement for normal clay bricks and has better properties than it. Fly ash bricks competitive in comparison to the conventional clay bricks and provide enormous indirect benefits.
Image result for what is PAVER BLOCKS Block paving is one of the most popular flexible pavement surfacing options. It is made from various materials (concrete, clay, recycled plastic etc.) but most commonly used are clay and concrete. Paver blocks are used for exterior pavement applications.
Concrete blocks are made from cast concrete, e.g. Portland cement and aggregate, usually sand and fine gravel for high-density blocks. Lower density blocks may use industrial wastes as an aggregate.