The thicker sides will also be necessary to hold the weight of the wet soil inside. A piece like this is going to be big and heavy and will certainly require durability. His would probably require planter sides that are about 2 ½” thick. I haven’t made one this large yet, but would like to. Let’s take a hypothetical example of a 2 foot wide x 2 ½ foot high concrete planter box. The Best Mix For Large-sized Concrete Planter Boxes Always use the least amount of water to achieve the most fluidity needed for filling the voids of your mold. We need to make sure we can get the concrete or cement mix into it.Īnd this is where the workability/fluidity comes into play. The distance from the outer mold and inner mold insert will be a void. The thickness for durability will determine what size you need for your mold. Thickness of the walls and bottom adds weight to your cement project, and so more weight requires thicker concrete. And as concrete planter sizes go down, the narrower you can go with your wall and bottom thicknesses. Larger sized planter projects usually need thicker walls and bottoms. The heavier the planter, the more durability you will need. Large planters are great to use as examples. And weight will go hand in hand with durability. Size is important because it is a direct factor in weight. If you are wondering, the reason Sakrete doesn’t get a lot of mention here is just that I have very little experience with it.īy the way, this article will help you out with recommendations on general best cement mixes outside the US and Canada. This is because (at least in my area), Sakrete’s mixes are only sold at Lowe’s, but Quikrete and RapidSet are at Home Depot, and that’s what I have closest to me. There are three major brands sold in the two main big home improvement stores here- they are Quikrete, RapidSet and Sakrete. Note: The mixes mentioned in this post are common concrete mixes found in the US. I just found a mix I love, that’s versatile for most anything, and rarely fails me. I’ll also go through some non-planter projects and explain the deciding factors for mixes for those as well. Concrete Aesthetic Considerationsįor comparison, here are examples of four different planter projects and why they would require different types of concrete mixes. So in concrete projects where you have molds with narrow spaces, having a higher ratio of cement will allow you to use less water because you’ll have more fluidity. These may be more difficult to work with than ones with a low cement to sand ratio. There are mixes that don’t have large aggregate, but do contain a very high sand to cement ratio. They won’t have needed the additional amount of water added to make them workable. Mixes with large aggregate are going to be more difficult to work with, and in narrower molds they will require more water than they are specified for.īut in wide cavity molds, larger aggregate mixes will make the concrete stronger. The amount of strength needed for the project will be vital in making the right concrete mix choice. If the mix requires a lot of water to make it fluid enough to fit into the cavity your mold, and you end up adding too much water then you will have weakened your mix. What consistency does it need to be to flow into the mold? The Factors Determining What Is The Best Concrete Mix To Use For Your Project Mixture Consistency The Best Concrete Mix For Small Slab Applications.Best Concrete Mixes For Thick Structural applications.Best Mix For Planters With Wide Mold Cavities But Smaller In Size.The Best Mix Concrete Molds With Narrow Voids.Best Mix For Medium-sized Concrete Planter Boxes.The Best Mix For Large-sized Concrete Planter Boxes.
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