Addendum to the corresponding paper. The data was originally used to explore the effects of a two-stage mixing process on the properties of fresh concrete.

The data set represents experimental measurements taken with a modified ICAR Rheometer on three different concrete proportions with two different mixing configurations. The data includes yield stress and plastic viscosity. Yield stress represents the minimum shear stress required to initiate flow of the fresh concrete, reflecting interparticle structure and cohesion (reported in Pa); Plastic viscosity represents the proportionality between shear stress above the yield and shear rate under a Bingham model, describing resistance to flow once movement has begun (reported in Pa·s).

The measurements were conducted using two different measurement protocols, sequential and pointwise:

Sequential protocol (SEQ): An uninterrupted staircase test where rotational speed is decreased from 0.45 to 0.05 rps with measurements taking place at five 10-s plateaus, yielding one continuous flow curve per run. Pointwise protocol (PW): Single-point measurements at the same five rotational speeds with full re-homogenization prior to each point, providing pre-shear-mitigated torque readings at each speed for separate flow-curve estimation.

Both protocols have been conducted twice with the following order: PW1 → SEQ1 → SEQ2 → PW2. Data for both protocols has undergone a baseline correction to account for parasitic losses from bearings, seals, and other components quantified through a no-load characterization. The results revealed differences in robustness and accuracy of relative rheometer data.