Alternative Concrete Mixes

orionkf

Pros/cons and opinions on the following:

1. Pre-mixed, bagged concrete (just add water) compared to 3:2:1 agg/sand/porltland mix. Which one do you use and why? Anyone add extra portland or other additives to pre-mix (calcium, etc.)?

2. Using the 3:2:1 concept, what about going with a 5:1 ratio of recycled concrete aggregate to portland. Any reason not to do this?

3. Similar to #2, what about using 5:1 ratio of 3/4 minus limestone to portland. Again, any reason not to do this?


This is mainly for setting fence posts, but also for deck post supports.

dougchips

The premix in the bag could use some extra portland cement. For dock footings I will use portland, mesh and stone. For walkway pavers I use portland and fiberglass mesh which is hard to find now. Years ago I use to make a mix for between the logs in log homes, white portland, lime and I think sand, the stuff would burn when you cut your hands.

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