2.3. Dispersion characterization of CNT based suspensionsUV–vis measurements were conducted in a Shimadzu UVmini-1240 spectrophotometer (Shimadzu Corp., Kyoto, Japan). PureSDBS and Viscocrete samples were initially recorded for baselinepurposes. A 10 l droplet of the CNT suspension was diluted in 3 mlof distilled water in PMMA cuvettes.For benchmarking purposes, the dispersion quality of sus-pensions was independently evaluated by LMLD following theexperimental and interpretation methodologies developed previ-ously [21]. In brief, the operational principle of LMLD relies on theobservation that the spatial distribution of light scattered from aliquid is proportional to the sizes of particles in suspension therein.Based on the size distribution curve of particles in suspension, themean particle size, expressed by the average agglomerate diameter,Dmean, and the polydispersity index, PDI, of the distribution, werecalculated. The PDI value of each distribution was used for evaluat-ing dispersion quality; as a general rule index values higher than 0.5200