Ultrasonic Pulse Velocities relate to a dynamic elastic modulus and therefore are a proxy for strength.

[…] they offer the advantage of a high throughput since they are continuous and allow several samples to be measured in parallel. […] in terms of formulation, this allows for a rapid refinement of the accelerator dosage.

Boscaro, F. et al. (2022) - Eco-Friendly, Set-on-Demand Digital Concrete in: Case Studies in Construction Materials - In: 3D Printing and Additive Manufacturing 

https://doi.org/10.1089/3dp.2020.0350

The development of a fly ash-based geopolymer for extrusion-based 3D printing, along with a printability prediction method - In: Case Studies in Construction Materials