Reinforcement of concrete columns
Reinforcement of concrete columns goes by making a concrete shirt. In the event of high rust of the reinforcement iron, the Engineers strengthen columns in the previously mentioned cases by making a concrete Jacketing.
ُEngineers restore Columns in the following cases:
1- The presence of effective cracks in the column
2- The presence of rust in the rebar
3- The sufficient nesting presence in the concrete of the column
4- Drum the concrete cover
The dimensions of the concrete Jacketing, the diameters, and the number of reinforcing iron bars depend on the requirements that led to the necessity of making the shirt according to the following steps:
1- Belts work every 50-75 cm for the entire length of the column by removing the concrete cover with a width of 5 cm in the places of the belts, cleaning the reinforcement steel well from rust, and painting it with Kimboxy 131, then packing the column in the belts places of the with 2 & 8-10 mm cans.
2- The belts are locked on the surface of the column using the zircon. In the case of columns with large sectors, the belts can be fixed in the columns using flags planted on the surface of the column.
3- Engineers fill The belts with necessary mortar such as A Dibond 65 mortar or (Coface 2F) mortar.
4- Engineers remove The concrete cover in the places between the belts
5- Engineers clean Reinforcement steel of rust using a wire brush mounted on a drill or sand gun.
6- Paint the iron with an anti-rust material such as Kimapoxy 131.
7- Engineers plant Ashers to connect the new iron kanats to the shirt in both directions at distances of 25-50 cm.
8- Engineers plant Ashersfor vertical iron with the same number and diameter used in vertical rebar
9- Engineers install The vertical iron, then the canes
10- The column is painted with a surface-strengthening substance, Kimapoxy 104, to connect the old concrete with the new one
11- Engineers make The concrete cover of special concrete consisting of fine aggregate with a maximum grain size of no more than 5 mm, sand and cement at high rates of not less than 400 kg/m3, and additives to increase fluidity such as Adcrete BVS or Adcrete BFV at a rate of not less than 6 kg/m3.
12- The shirt concrete is poured either by wooden formwork or by concrete cannon
Source: wikipedia.org/wiki/Reinforced_concrete
Read More: buildineg.com/public/blog/what-is-a-concrete-jacketing-of-column/
