Author: Obidjonov, Jahongir Tokhir ugli

Annotation: A science-and-engineering rationale is presented for selecting the sequence of component loading during the production of basalt fiber-reinforced concrete (BFRC), with emphasis on the mechanisms of fiber balling formation/prevention and the controllability of fresh-mix rheology. Based on four production-ready mixing schemes described in Chapter 3 of the source document (including the variant with short “wet” fiber dispersion in a dilute PVA solution and early contact with the sand fraction), it is shown that precisely this regimen ensures a stable reduction of the variability of fiber distribution (coefficient of variation V ≈ 7.5–8.0%) while keeping the total cycle time comparable (≈2.5 min), whereas alternative sequences produce a higher spread (V ≈ 9–14%), which naturally manifests as a less stable strength response. These positions are consistent with ACI 544.3R and ACI 304R guidance on the critical role of loading order for FRC and with the European EFNARC recommendations for SCC, where the need to align sequence with target slump-flow, blocking and viscosity indices is set out normatively [1,2,3].

Keywords: basalt fiber; fiber-reinforced concrete; mixing scheme; loading sequence; homogeneity; coefficient of variation; fiber balling; superplasticizer; polycarboxylate; PVA treatment; turbulent mixer; rotor (pan) mixer; self-compacting concrete; EFNARC; ACI 544.3R; ACI 304R.

Pages in journal: 373 - 376