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What is the correct particle size range for iAVs-suitable sand?
The recommended particle size for is 0.4mm to 1.2mm with no silt or clay.
Quikrete offers sand sizes as follows:
– All-Purpose: 8-50 mesh (2.38mm-0.297mm)
– Coarse Sand: 12-30 mesh (1.68mm-0.595mm)
– Medium Sand: 20-50 mesh (0.841mm-0.297mm)
– Fine Sand: 30-70 mesh (1.68mm-0.21mm)
Although the all-purpose option may be slightly out of range, there should be no issues with using some smaller and some larger sizes. To remove finer particles, a small stainless steel mesh screener could be used at the outlet after running the system for a bit.
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It is okay to have a few particles larger than 2 mm, but avoid having particles smaller than 0.25 mm. The ideal sand should have a consistency similar to table salt or granulated sugar, with no powdery fraction or particles that could cause clogging.
In summary, the ideal particle size range is:
- 40% between 1-2 mm
- 40% between 0.5-1 mm (about the size of a grain of table salt)
- 20% between 0.25-0.5 mm
With minimal particles outside those size ranges.
The image below shows quartz silica sand (granite or volcanic glass can also work) in what I believe is the best particle size range. The color can vary (which is less important than the size) as long as it’s not from any harmful or toxic substances attached to the grains. Other particle size types might also work for iAVs, but they may not offer the best combination of qualities for optimal results. Any place on Earth that can produce solid concrete should have access to suitable sand. Sharp grains are preferred over rounded or smooth ones, which should be slightly larger and more uniform in size to reduce settling and compaction issues. The photo demonstrates what I think will give the best outcomes. Sand like this, much like diamonds, lasts forever and is more valuable in the long run. In my opinion, investing time and money in getting the best sand is worthwhile. In the US and many other places, silica sand costs the same as gravel, whether by volume or weight. Additionally, I believe that if something is worth doing, it’s worth doing well.
Additional information can be found in: ‘An Introduction to iAVs.’
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