Relating the molecular structure of comb-type superplasticizers to the compression rheology of MgO suspensions

Fluidizing efficiency of comb-like superplasticizers: The effect of the anionic function, the side chain length and the grafting degree

“…As evoked in [20], the solubility of PCE is not only governed by the PEO side chains, but also by the molar mass, the local concentration and molecular environment of PCE which can evolve once adsorbed. In that case the conformation and layer thickness can be modified with the increase of the surface adsorption rate and lead to change the efficiency of the steric repulsion [22]. These two remarks pointed out the more global question about the validity of transposing a model designed for the solution behavior to a model at the surface where the ionic conditions and the dilution regime of the polymer can change.…”

“…But under these conditions the sedimentation of particles can make the experimental study complex. However a compressive yield stress study [22] shows that the yield stress varies with the inverse square of the separation distance. At full coverage, the separation distance is assumed to be two layer thicknesses of adsorbed polymers (H = 2 × R ac ).…”

Study of the influence of water reducing and setting retarder admixtures of polycarboxylate “s uperplasticizers ” on physical and mechanical properties of mortar and concrete

“…Methods of preparation of mortar and/or concrete in the hardened State To achieve the objective of our study, we prepared a mortar of reference without and with superplasticizers SP402 which the compositions are inspired by the normal mortar defined by the standard EN 196-1, with a quantity of water and adjusted and a paste with a consistency standard as shown in Table (5). The procedures followed for the preparation of our mortars begin with mixing, the procedures followed for the preparation of our mortars begin with the mixer, and then we filled a mold (4 x 4 x 16) cm 3 . The Tightening of the mortar in this mold is obtained by introducing the mortar twice and by applying to the mold 60 shocks each time using the shock device.…”

“…The fluidity and the flow of cement paste have controlled by workability in the fresh state as well as the compressive strength and the durability of mortars and/or concretes [3][4][5][6]. These properties depend strongly on the dispersion of the cement paste composed of water, cement, mineral additives and admixtures [7][8][9][10][11][12].…”

Density profiles of loose and collapsed cohesive granular structures generated by ballistic deposition

“…discussed in Refs. [53][54][55][56][57]. In addition in the next section we will show that also for the more complex process when gravity acts during deposition (sec.…”