Aluminium Posts In Concrete

Posted 2012 oct 13 5 55 pm aest.

Aluminium posts in concrete.

The result is a v shaped hole. Instead of concrete consider something else like gravel there s also an expanding foam similar to great stuff that s rated for ground contact and sold specifically for setting fence posts. The corrosion can cause expansion of the concrete and subsequent cracking of hardened concrete. Last updated posted 2015 jan 18 10 09 pm aest posted 2015 jan 18 10 09 pm aest user 298608 20 posts.

A number of cases have been reported in which excessive corrosion of aluminum conduits has resulted in cracking and spalling of the concrete in which it was embedded. Second if the aluminum is coupled with any ferrous metals galvanic corrosion will occur also. Aluminum powder is added to the concrete and the reaction fills the concrete with gas bubbles. There is no sealant at the base of the post where it meets the bonsal grout.

Ironcraft orleans 2 in x 2 in w x 6 ft h black aluminum line fence post. Novices anticipate no problem in setting fence posts in such holes then filling the holes up with concrete. But when you fill those v shaped holes with concrete you end up with v shaped hunks of concrete. First a significant corrosion of aluminum embedded in concrete can occur.

For steel or aluminium posts please ensure that your posts are sealed according to the manufacturers recommendations to prevent corrosion occurring. Aluminium posts with quick set concrete. In fresh concrete aluminum reacts principally with alkali hydroxides from cement. In cases of corrosion where the concrete cover was too thick to result in concrete failure the conduit collapsed inwardly.

Aluminum in contact with plain concrete can corrode and the situation is worse if the concrete contains calcium chloride as an admixture or if the aluminum is in contact with a dissimilar metal. But serious consequences can arise in situations of long term contact. Rapid set concrete specially formulated to harden rapidly so you can complete a job faster. The aluminum posts are coated with morton poyceram 1400 as its standard finish.

The ph of fresh mortar ranges from 12 to 13. This finish is a baked polyester enamel coating which is manufactured to meet or exceed aama specification 603 8.