Title:
Dust-of-Fracture Aggregate Microfines in Self-Consolidating Concrete
Author(s):
Eric P. Koehler and David W. Fowler
Publication:
Materials Journal
Volume:
105
Issue:
2
Appears on pages(s):
165-173
Keywords:
aggregate; mixture proportioning; rheology; self-consolidating concrete.
DOI:
10.14359/19757
Date:
3/1/2008
Abstract:
Dust-of-fracture aggregate microfines defined as material finer than 75 µm produced during the crushing of aggregates— were evaluated for use in self-consolidating concrete (SCC). Mortar and concrete mixtures were tested to evaluate the effects of six microfines on workability (high-range water-reducing admixture [HRWRA] demand and plastic viscosity) and hardened properties (compressive and flexural strengths, modulus of elasticity, rapid chloride permeability, drying shrinkage, and abrasion resistance). The effects of microfines on workability depended on the particle size distribution, shape characteristics, and methylene blue value of the microfines. When compared at a constant water-cementitious material ratio (w/cm), microfines generally had minimal effects on hardened properties.