I want to set some 6x6 posts in the ground using Quikrete. They recommend using the fast-setting product (1104) without mixing, which I prefer because it's much easier than hand mixing in a wheelbarrow. But the high-strength mix (1101) is much cheaper. I'm not in a hurry so I don't mind the slow curing time, I just want to save money. So is there any reason not to use the high-strength product the same way without mixing?
From the high-strength datasheet:
Start by digging the post hole about 3 times the diameter of the post. Hole depth should be 1/3 the overall post height. Place 6 in (150 mm) of dry concrete mix in the bottom of the hole. Position the post, checking that it is level and plumb. Mix QUIKRETE Concrete Mix with water prior to placement into the hole. When standing water has evaporated from the concrete, smooth the surface. Taper it away from the post so rain will flow in that direction. Wait 24 hours before post is subjected to any strain. For load-bearing applications, follow local building codes for proper footing specifications.
From the fast-setting datasheet:
- Place post into hole and temporarily stand straight. The hole diameter should be 3 times the post diameter. The depth of the post hole should be one-half of the above ground post height.
- Pour dry mix into the hole until it is approximately 3" - 4" (76 - 102 mm) from the top.
- Pour water into the dry mix until the powder is saturated with water. Depending on soil conditions, this will require about 1 gallon (3.8 L) of water per 50 lb (22.7 kg) bag. For holes deeper than 2' 6" (0.8 m), place the material in lifts of 2' 6" (0.8 m) or less to allow water to soak all the way through.
- Fill the remainder of the hole with soil dug from the hole. This product sets in 20 - 40 minutes. Wait 4 hours before placing heavy objects.
Price at Home Depot:
Fast setting $6.51 for 50 lbs
High strength $4.11 for 60 lbs