[downplay]

We bought the regular 4000 PSI Quikrete, not any of the special mixes. We are setting wooden posts in it.

Within what time frame must it be in the hole and the top shaped for good strength?

 

[jmon]

I'm guessing within about 20 - 40 minutes or so depending on what size bag/how much you are using. Should be plenty of time for you to set your post.

I would wait a few hours before any weight or stress is put on it. Check the instructions on the bag to make sure.

 

[Canarywood1]

Initial set is 2 hours, final set is 4 hours.

 

[downplay]

Initial set is 2 hours, final set is 4 hours.

So, would this mean I have up to 2 hours to work with it before it needs to be in place?

 

[Mort]

No, I wouldn't take that long. Probably 20-30 minutes at best. "Initial set" means you can walk on it and only leave a small footprint. You need it much more fluid than that.

 

[woodchopper65]

A great concrete for all-purpose work, SAKRETE 80 lb. Gray Concrete Mix is suitable for use in setting footings and pouring slabs. This concrete can be applied for anchoring posts and poles as well. Meets ASTM C 387 strength requirements.

• Premium concrete for all purpose applications
• Use for walks, footings, slabs and steps, anchoring posts and poles
• For applications requiring at least 2 in. in thickness
• Approximate 45-minute working time
• 4,000 psi

45 minute work time..

 

[Fix'n it]

this question is irrelevant. the proper way to do it = get all of the materials and tools setup . post in the hole. then mix the concrete and dump it in.

 

[concretemasonry]

You really don't need much strength for concrete around a post.

High strength 4000 psi is a waste of time and makes you push too fast because of the set.

Put a post in and brace it is you are going to do several at once and the come back for finishing the exposed top.

Even the weakest concrete will be stronger than the wood post or soil surrounding it.

Dick