My son just dropped a cool paper on me.

[Igel]

3. Argh!

Yes, "Argh!"

I can't see the paper. How does high-energy radiation "harden" plastic?

Increase cross-linkages?

When already embedded in concrete create bonds between the plastic and the minerals in the concrete?

Yada-yada explain "the mechanisms for strength retention when using irradiated plastic as a filler for cement paste." Okay, so, then, explain. (Or not and watch me write, "Argh!".)

But this is compressive strength. Anything in the footnotes about shear? Tension?

Hoped to learn something. Go away pondering German separable verbs, which is never (ever) a good thing.

On edit: In case you think this is anything but tongue-in-cheek real annoyance--okay, I'm annoyed, but I really was hoping that it would tell me something instead of clobber me with a firewall--I usually really like your posts. Even the ones that go over my humble HS science teacher's head.