## 1 Introduction
It was concluded that such PCE of high anionicity, high _molecular weight_, and side chains of short length adsorbed particularly high amounts on AAC particles (NaOH--4% by mass of ground granulated blast-furnace slag), thus providing the enhanced dispersion capacity as compared to other polymers [66]. Another type of _ether-based PCE_ is isoprenyl oxy poly(ethylene glycol) ether (IPEG) PCEs [70]. The dispersing ability of such superplasticizer in AAC and degree of adsorption depends on the _molecular weight_ and anionicity of the polymer. A novel polycarboxylate amine superplasticizer with high adsorption capacity was obtained by replacing the polyethylene oxide side chain in the classical PCE with a bulky pendant group, sterically hindered amine (2,2,6,6-tetramethyl-4-piperidyl methacrylate), employing the Reversible-Addition Fragmentation Chain Transfer polymerization [71]. This polycarboxylate amine copolymer was found to significantly reduce the yield stress of the AAC pastes at low dosages (i.e., 0.1%) due to pendant groups, below the values that were previously obtained for PCE with varying polyethylene oxide side-chain lengths [72]. However, PCEs of the proposed molecular structures, that are specifically synthesized for the AAC materials, are rarely produced by the industry. On the other side, conventional _ester-based_ (MPEG)PCEs, widely used in the manufacturing of OPC materials, are ineffective due to the reduced degree of adsorption on the AAC mineral particles. Thus, the action effect of plasticizing admixtures in AAC depends upon the _degree of adsorption_ and _stability of the molecular structure_, as well as the _molecular weight_. The AAC basicity, which depends upon the content and composition of the aluminosilicate component, as well the anion of the alkaline component, are the main factors determining the action of plasticizing admixtures. The degree of dispersing of the AAC suspension in a material is one more important factor [40]. So, plasticizing admixtures decrease the yield stress value at a low and high degree of dispersing [73]. However, with the addition of plasticizing surfactant, the plastic viscosity of a concrete mix remains practically without changes, whereas in a cement paste, this admixture can change a plastic viscosity similar to water. Changes in the cement suspension structure and thixotropic properties are clearly expressed in the suspensions with the higher degree of dispersing [74]. Rheology of the AAC materials differs from that of the OPC-based materials and depends upon the AAC composition, as well as the type and concentration of the alkaline component and technological parameters [22; 23]. Furthermore, the rheological properties of the AAC suspensions are more sensitive to changes in solid-phase concentration compared to those of OPC suspensions [75]. For all of this, the purpose of the present study is to establish an interrelation between the molecular structure stability, degree of adsorption, and molecular weight of a surfactant and its plasticizing effect depending upon the AAC basicity, anion of the alkaline component, and degree of dispersing of AAC in the materials for a wide range of AAC-based materials, from lightened grouts to building mortars and heavyweight concretes.