The sand flea jumping robot uses a single CO2 powered piston to propel itself into the air. Really, the only engineering feat the device has is that it can repeatedly fall from those heights without breaking. The wheels are the real interesting part on it.
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Plastering sand is find sand screened to suit the plaster coarse i.e. base coat or finish coat. For finish coat very fine sand is used. Sand for concrete is not sived if pebles are not present. Both sand shall be sweet sand, if from sea it has to be washed before use.
Fine sand is best for mortar.
Not just any sand. Mortar sand. Mortar sand is a larger grain sand that has been washed and screened to remove any rocks or pebbles.
Shear strength of fine sand is determined by the angularity of the sand particles, the grading of the sand. These two features governs the critical state shear strength parameters of the sand. Density, however, dictates the peak shear strength of the sand. i.e. the denser the sand, the higher the peak shear strength. But the critical shear strength remain the same. The denser the sand, the lower the void ratio. Shear strength of fine sand is determined by the angularity of the sand particles, the grading of the sand. These two features governs the critical state shear strength parameters of the sand. Density, however, dictates the peak shear strength of the sand. i.e. the denser the sand, the higher the peak shear strength. But the critical shear strength remain the same. The denser the sand, the lower the void ratio.
The sand (ballast) provides strength, hardness, and durability. The cement binds the sand/gravel together.