The concrete planter ends are progressing. All the joints got filled with silicone and a glass tile design was put into the front.
The mix was a quikrete 5000 base with 50% latex modifier. I used water reducer to bring the w/c to 0.4. It also had some fibers and a little bit of black pigment to make it a little darker. Here is my simple setup, complete with the bathroom scale and cat litter buckets.
I use two types of fibers. The left is a fibrillated (think fish net) polypropylene. The right is a cellulose fiber let over from making furnace filters and dusters. The little packets break up into individual fibers. Since I don't use any reinforcing steel, these will keep any cracks small. These planters won't ever be in tension so I probably don't need any fibers.
With the high range water reducer the concrete has the consistency of stiff honey. A little hand vibration and it flows. It needed to be flowable to get under the mounting lip for the wood boards.
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