I have electric gates and my question is regarding the pillar that the arms are attached to.
Use Hydraulic Cement, rather than regular concrete. Regular concrete mix, sand mix, etc doesn't bond well to existing concrete. As soon as you put some torque on it, the bond breaks. When you dig or chip out the area to be replaced, make it larger at the back than the front. When you fill it with hydraulic cement, the slight expansion of the hydraulic cement will force a tight bond. The brand that I used for years is Rockite by Hartline Products, but there are probably ten others. Most people don't realize that when normal Portland cement cures, it shrinks slightly, which is one of the reasons it doesn't bond well to other concrete... it pulls away. If you look at where railings have been drilled into existing concrete steps, you'll see smooth gray material has been poured in. That is usually hydraulic cement. For a sideways application, you will need to make a form to hold the cement it... it is very liquid when you pour it. I would advise putting your bracket and supports in first, and pouring them in place. Put nuts and washers on the bolts, so the cement has something to grab. Be aware, you have to work fast. From mixing to initial cure is only a minute or two.
Jan 04, 2016 |
Cars & Trucks