Rheological behavior of high performance concrete with mineral admixtures and their blending

Contribution to the Design of Hydraulic Lime-Based Grouts for Masonry Consolidation

“…This behaviour is probably due to the replacement of irregular hydraulic lime particles by FA particles with spherical morphology (Lasker, Sudip 2008), which contributes not only to a less mono-sized suspension but also to a lubricant effect between lime particles that facilitates the beginning of grout flow (reducing the yield stress), as can be seen by comparing the yield stress values of mix 1 and mix 3. The FA does not adversely affect the rheological performance as SF does, because the FA particles are not as small as SF particles.…”

“…Moreover, it is expected that high SF fineness increases the adsorption of water, thus allowing better water retention capabilities. However, these finer particles are the source of additional surface area resulting in an increase of contact forces among solid particles (Van-der-Waal's interactions) requiring the presence of a high range water reducer to minimize this problem, such as superplasticiser (Lasker, Sudip 2008;Artelt, Garcia 2008). According to Kadri (2009) the presence of SF also has a slight accelerating effect on the early age of strength development.…”

“…On the other hand, SF is an additive from electrometallurgy industry and can be applied as a fine filler whose particles fill the spaces made by the large and the long shape of hydraulic lime particles. Due to very fine SF particles among lime particles decrease of frictional forces between lime particles and a reduction of yield stress are expected (Lasker, Sudip 2008). Moreover, it is expected that high SF fineness increases the adsorption of water, thus allowing better water retention capabilities.…”

Effect of powdered activated carbon on the air void characteristics of concrete containing fly ash

“…Fly ash has been successfully used as a supplementary cementing admixture in concrete for decades as it is economic, environmentally advantageous and improves the concrete mechanical properties and durability [1][2][3][4]. According to the American Coal Ash Association, over 24 million tons of fly ash was consumed as a cement replacement in the United States in 2010 which was a 30% increase compared with 2000 [5].…”

A Survey of High Performance Concrete Developments in Civil Engineering Field

“…Durability factor at the end of 30 freezing and thawing cycle of High Performance Concrete samples were examined [9]. Rhelogical properties of High Performance Concrete mixes produced by rice husk ash and fly ash were studied and found that for low yield stress and moderate plastic viscosity, blending of equal masses of silica fume and rice husk ash seems to be a suitable admixture [10]. A. H. Menon et al [11] [16] produced low cost High Performance concrete by replacing fly ash with cement.…”