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Home Construction Basics Special Types of Concrete Hollow Blocks
Home Construction Basics Special Types of Concrete Hollow Blocks
| Special Types of Concrete Hollow Blocks |
| Saturday, 12 April 2008 08:09 | ||||||
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The purpose of manufacturing these types of blocks is to create a wider cell to accommodate concrete and steel reinforcement. The estimating method is similar with the ordinary blocks using the constant value of 12.5 pieces per square meter and 25 pieces for half block although this half block is usually determined by direct counting. It will be noticed that the thickness of the block is only used in estimating the cement mortar for block laying and as filler of the hollow core. It is the side portion which is being used in estimating the number or quantity more particularly the Area method. With the introduction of these special types of hollow blocks, housing projects are being constructed eliminating the use of reinforced concrete posts because the wall is designed as a continuous inter-locking support of the roof framing. Corner block and Stretcher blocks are used on corners provided with reinforcement instead of concrete post. With this method, cost of forms is felt as a big savings. If the cement mortar is solely used in block laying and as filler of the hollow core, cost will be substantially high because of the higher content of the cement in proportion with sand. However, cost could be reduced materially if the hollow core filler is a mixture of mortar and gravel. Experience proved that the masonry worker could hardly observed the used of concrete as filler because it is more convenient for them to use only mortar rather than concrete. Hence, estimating cement mortar as filler is a safe estimate.
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