The talk about it mainly being used on path ways means it's especially exposed to the environment, making me concerned about plastic particulate being released.

The talk about it mainly being used on path ways means it's especially exposed to the environment, making me concerned about plastic particulate being released. Some research on the topic would be nice. Is this really the best use for plastic, can't you do a lot more with it than that? Doesn't mixing it with sand make it much harder to recycle later? Isn't cement a just fine binder for sand (which is the actually scarce resource)? With all those concerns, though, that she's a materials engineer calms my inner voice eager to scream "scam".