July 29, 2015 Leave a comment
Masonry: Concrete Hollow Block Laying
One of the most common building material used is Concrete Hollow Blocks. Most construction systems in the Philippines lay out the structural “skeleton” of the building, usually reinforced concrete columns and beams, and then layout the rest of the building in CHB, as it is abbreviated. The popularity of hollow blocks or CHB comes from its modular use and portability. It is easy to transport, is standard like a lego block that can create all kinds of walls – even curves and cylinders!
There are different materials having modular use such as sand bags, bricks, stone and adobe blocks. But CHB wins over because of its simple composition – sand, fly ash and cement. Stones and adobe must be quarried from special location (its sources) and transported to thousands of kilometers to the site while CHB can be cast in all kinds of location on Earth.
There are many kinds of concrete blocks because molding them allows one to customize what one needs. But concrete hollow blocks evolved to mean the most commonly used ones: 4″ (100mm), 6″ (150mm) and 8″ (rarely used 200mm) which come in the same height and width 8″x 16″ (0.1×0.2x.4). Different structural strengths can also be produced by varying the amount of cement in the mold. Standard strength for CHB is 500 psi for Bungalow up to 4 Storeys and 700 psi for High Rise Construction. Walls in 700 psi CHB is considered as load bearing.
Because hollow blocks are a common material, non-professional people take them for granted in the site. As construction sites require large areas to be programmed for CHB, Sand and Gravel, careful planning for location on site ensures that masons working will have enough space to mix the mortar and install CHB.
Read Constructing a House in Iloilo City.
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