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You can use pea gravel but if your goal is ultimately tensile strength something sharp and angular is the way to go.
I have done test pours with busted up ceramic tile, that was one of the best ones. So good I have several old toilets stashed to use as aggregate next time I need some ballistic concrete.
The worst concrete I made used terracotta aggregate. Terracotta rubble is driveway cover, french drain aggregate as far as I'm concerned.
Older concrete is better when you want recycled concrete. It gets harder over time with repeated exposure to water.
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1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
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