May 12, 2014
It is important to note that the aluminum posts to be set in concrete must have a protective coating, as there is a well-documented reaction of aluminum to Portland cement (as contained in concrete) which will cause corrosion and subsequent expansion and destruction of the concrete. Most aluminum posts are galvanized or have a protective paint coating, but please be sure that this is the case with the posts you are using. QUIKRETE Concrete Mix must be blended with water before being placed. When placing fence posts, the depth of the post hole should be one-half of the above-ground post height, for example: For your posts with an overall height of 6 feet, 2 feet (24”) should be placed in the ground, with 4 feet above ground. The diameter of the hole should be approximately 3 times that of the posts. For holes with a 9” diameter that are 24” deep, and a 3” x 3” square post placed within, each hole will require approximately 1 ¼ 80 lb. bags of mixed QUIKRETE Concrete Mix #1101, for a total of approximately 40 80 lb bags for 32 posts. For holes with a 12” diameter that are 24” deep, and a 4” x 4” square post placed within, each hole will require approximately 2 ¼ 80 lb. bags of mixed QUIKRETE Concrete Mix #1101, for a total of approximately 72 80 lb bags for 32 posts. These are estimates, and will be affected by uneven hole dimensions, waste, etc.
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