Influences of Ultrafine Slag Slurry Prepared by Wet Ball Milling on the Properties of Concrete

Abstract

e application of ultrafine ground-granulated blast-furnace slag (GGBFS) in concrete becomes widely used for high performance and environmental sustainability. e form of ultrafine slag (UFS) used in concrete is powder for convenience of transport and store. Drying-grinding-drying processes are needed before the application for wet emission. is paper aims at exploring the performances of concrete blended with GGBFS in form of slurry. e ultrafine slag slurry (UFSS) was obtained by the process of grinding the original slag in a wet ball mill, which was mixed in concrete directly. e durations of grinding were 20 min, 40 min, and 60 min which were used to replace Portland cement with different percentages, namely, 20, 35, and 50, and were designed to compare cement with original slag concrete. e workability was investigated in terms of fluidity. Microstructure and pore structure were evaluated by X-ray diffraction (XRD), scanning electron microscopy (SEM), and mercury intrusion porosimetry (MIP). e fluidity of concrete mixed with UFSS is deteriorated slightly. e microstructure and early strength were obviously improved with the grind duration extended.

Compressive strength development of steam cured cement paste with high volume wet-grinded coal fly ash

“…W badaniach wykorzystano cement portlandzki CEMI 42.5, zgodny z wymaganiami chińskiej normy GB175-2007 oraz popiół lotny gatunku F-II, zgodny z wymaganiami normy GB-T 1596-2005. than 5 mm showed considerably higher reactivity in comparison with raw FA (43). Particles with D 50 less than 3 μm could also be obtained by the wet-grinding process, which has been proved in our previous studies (44)(45)(46)(47)(48). By contrast, lower energy consumption and higher grinding effi ciency were found in wet grinding, because water molecules present in the grinding system could adsorb onto the surface of particles and reduce the surface energy of fi ne particles, thereby hindering its self-aggregation (49,50).…”

“…Popiół o wielkości ziaren mniejszej od 5 μm był bardziej reaktywny w porównaniu z popiołem niemielonym (43). Autorzy otrzymali ziarna o wymiarze D 50 mniejszym niż 3 μm, w przypadku mielenia na mokro (44)(45)(46)(47)(48). Wydajność mielenia na mokro jest większa i zużycie energii mniejsze, ponieważ cząsteczki wody w młynie adsorbują się na powierzchni ziaren i zmniejszają ich energię powierzchniową, utrudniając w ten sposób aglomerację (49,50).…”

Wet extractive grinding process for efficient calcium recovery from steelmaking slags

“…Our hypothesis is that, by implementing the extraction and the wet grinding simultaneously, we would be able to keep the reaction surface open and reach a higher reaction rate and yield. This hypothesis is supported by earlier research [4,6,[13][14][15][16][17][18]. We aim to maximize the rate and extraction efficiencies and to minimize the dissolution of other elements.…”