THIS IS AN ARTISAN WORK, IT HAS NOTHING TO DO WITH THE INDUSTRIAL PROCESS. IF WHAT YOU NEED IS SPEED IN THE PREPARATION, THIS IS NOT WHAT YOU ARE LOOKING FOR.
The commercial blocks are very cheap, and perhaps this project is a slow job for many, elaborating them one by one. It is not the economy that prevails here, but the pleasure of doing it yourself, like many other artisan things that are still made, but that cannot compete with industrial mass production.
In this project I propose the construction of a homemade mold for quadrangular blocks, which will serve as a form of cement to build pillars or load-bearing columns, that is, to arm the interior with corrugated iron rods and then fill with concrete. Therefore, they can be used for columns that need to support a considerable load. We can also use them to build chimney cannons, to discharge fumes by themselves, or to lead other pipes or ducts to discharge gases and fumes to the outside.
The advantage of building columns with this system is that we do not need to assemble molds for the formwork, because the mortar block already acts as a mold and, at the same time, is a structural part of the column, that is, its visible face will be that of the column itself. block, which can then be topped or covered with other materials. On the other hand, the assembly is much faster, since you only have to stack blocks vertically, adding the slab that is needed according to the height, and filling the gap with concrete.
The video shows the measurements of the boards that are needed to build the mold. The finished block will be 23x23 cm wide and 20 cm high; the width of the walls is 4 cm. The interior hole is 15x15x20 cm.
Note.- some followers ask me the proportion of sand and cement for the mass. If we want the blocks to serve as a container to build columns, a mixture rich in cement should be made, at the rate of one part of cement for every two of sand. It is not advisable to use gravel, it is preferable semi-coarse or even finer sand, to avoid that there are air spaces that could weaken the structure.
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These tubes are useful for discharging irrigation or rain water, both in agriculture and in runoff diversion works, etc.