How is it possible for this simple
cylinder of soil 
to support this concrete block while the other one failed? 
the answer is geogrid reinforcement.
geogrid adds significant strength soil cylinder and prevents it from failing.
We take sand that has been mixed with a little water and add it to the 2 gray cylinders.
The sand will be added in small layers
next we compact the layers of soil with a hand tamper
we reinforced the layers of soil in the
cylinder on the right using a simple
screen material which will represent
Allan Block Geogrid that  
is normally used in wall construction
continue by repeating the process and add additional layers of sand and
reinforcement. Each layer will be compacted as they are laid
Now we remove the gray cylinders 
 and place weight on the
unreinforced soil.
The unreinforced soil
cannot support much load 
We place the same load now
on to the reinforced soil.  
The reinforcement allows the soil to
handle additional weight by holding soil
together
you can see the stacked layers compact soil and reinforcement
Wanna learn more?  Visit us at allanblock.com
