Those numbers are off by an order of magnitude. American Concrete Institute (ACI) cutoff for needing compressive strength testing for concrete is 2500 psi.
Side note- Cemex makes really good concrete, I’ve had several jobs of late where their product approaches or exceeds design strength on 7 day breaks (design strength is based on 3 sample breaks at 28 days averaged).
Corporately, I’m irked that they recently made to shut down the sand quarry down in Monterey. It’s a source of fine #3 sand with little need for processing and it was on patented land IIRC, so the state couldn’t shut it down on an eco-whim...