Concrete blocks having core void area larger than 25% of the gross area is termed as hollow concrete blocks.
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nThese blocks are manufactured in different shapes and sizes as shown in the following figure.
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nSize
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all sizes are available.
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ADVANTAGES OF HOLLOW CONCRETE BLOCK
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Rapid Execution of Work
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nHollow concrete block are of uniform and regular size and it has less weight. This facilitates rapid execution of work.
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Increase in Floor Area
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nIt is possible to construct thin walls using hollow blocks. Therefore it helps to save space and increase floor area.
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Reduces Construction Cost
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nHollow block helps in saving construction materials and therefore use of hollow block reduces construction cost.
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nUse of larger size concrete block reduces number of joints in work and hence helps in saving mortar.
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Better Insulation Properties
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nHollow concrete block have good insulating properties against sound, heat and dampness.
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More Durable
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nHollow concrete block masonry can safely withstand the atmospheric action and it requires no protective covering.
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Employment of Unskilled Labour
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nUnskilled labour can also be employed in the construction of hollow concrete block masonry.
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Good Bonding of Mortar & Plaster
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nPresence of rough surface on concrete blocks provides good bonding of mortar and plaster.
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