A brick pillar is similar to a column which is a vertical support structure in architecture, but the base section is any shape but circular. A brick pillar is most commonly used in constructing a pillars for gates. It is made using the cement mortar. A cement mortar should be a cement, sand mixture of 1:4 ratio, which means one part of cement is mixed with 4 parts of sand (should be filtered for
. stones) and mix this ratio with required water. This mortar is of high strength and is recommended for brick pillars, heavy weight walls, etc. Before constructing the bricks pillar, the bricks should be soaked in water properly, else it will absorb the water from the mortar and the bonding will become weak. And the joints between two bricks should be filled with mortar without any gaps and it should be kept wet for several days, to make it gain more strength. Later, brick pillar will be strong enough to hold on to the gate or will be able to support the sealing. You can find more information here: http://www.gharexpert.com/articles/Brick-Walls,-Pillars-Structure-841/Brick-Work_0.aspx