Looking at it, it doesn't seem to loose strength with lifespan of tensile strength identical to regular concrete. After curing. It is a slower curer than regular concrete and fragile as heck early on during that 28 day period. My contractor emailed me about it late last week, doing some research on it now. There appears to be a concern initially with its vibration strength, but USC tested it to a level of a 9.5 magnitude earthquake and it survived undamaged.