Research of influence of polymer additives-stabilizers on physical-mechanical indicators and microstructure of cement ground

Abstract

The article describes the positive effect of cement ground modification by polymer stabilizers. The influence of the latex polymer stabilizer Nanoterrasoil, manufactured by NanoSky (Germany), and the polymer acryl-based stabilizer (SAP) on the physico-mechanical parameters of a light sandy loam exposed by Portland cement stabilization has been investigated. The effect of acrylic polymer on the microstructure of the cement ground based on light sandy loam has been studied. It has been established that when introducing the polymer stabilizer Nanoterrasoil (NTS) (1-1.5 wt. %) into the cement-ground mixture with a simultaneous decrease in the cement consumption, the final product - cement ground acquires the increased compression strength (28 days) in water-saturated state and saturation coefficient. Significant increase of physico-mechanical parameters has been established even in case of loam stabilization by acrylic polymer (SAP), even without cement introduction. The cement ground modified with acrylic polymer is characterized by a solid fusion microstructure. This proves that the individual organic ions of the acrylic polymer, when introduced into the cement ground, are adsorbed on the surface of the solid particles of clay minerals, enveloping and bonding them during polymerization, forming a complex organo-mineral system.

Composite Materials Based on Phosphogypsum for Constructive Layers of Road Pavement

“…As can be seen from the diffractograms, the mechanism of interaction between the components of the "phosphogypsum-granulated blast furnace slag-Portland cement" systems does not change with an increase in the phosphogypsum content, and the phase composition of the products of the interaction products indicates alkalinesulfate activation of the slag. [27][28][29][30][31] The phase composition of composite materials (cementitious substance 2) after 28 days is represented by gypsum (d/n= 0.756; 0.429; 0.308; 0.287; 0.268 nm), as well as products of hydration of the components of composite mixtures and interaction between them calcium hydrosilicates (tobermorite (d/n= 1.103; 0.550; 0.308; 0.281 nm), jennite (d/n= 1.050; 0.477; 0.347; 0.329; 0.304; 0.266 nm), ettringite (d/n= 0.973; 0.561; 0.388; 0.348; 0.256 nm) and portlandite (d/n= d/n=0.497; 0.263; 0.193; 0.179 nm)). The formation of hydrosulfoaluminate in the cementitious component due to sulfate activation contributes to the reinforcement of the system at the initial stage of interaction, breaking the gel film on the slag grains, diffusion of SO 4 2-, Ca 2+ and OHions into the grains and to prolong the hydration reaction and accelerate the strength gain.…”