Friday, May 9, 2025

Sand deposition

We think of sand on the beach as stable, but it is really mid-journey between rock and silt. This graph cleverly illustrates that it takes high flow to move both large and small particles sizes - large ones because of their bulk, and silt particles because of their cohesion. 
https://www.alexstrekeisen.it/english/sedi/index.php

Sand comes in many forms, as discussed in this video. 


Sand is increasingly more expensive to procure for construction - because useful particles to impart strength to concrete need to be (6:36) jagged to add strength. However, (12:03) round wind-blown sand requires less water to make workable concrete that ends up being stronger.  He says that the idea that windblown sands can't be used in concrete is a myth.

This video promotes the myth that round sand can't be used for construction. However, (3:55) recycled glass particles might make the perfect substitute. 



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