Surface Characteristics of Nanosized Bentonite Suspensions as a Modifying Component of Cement Composites

Abstract

The paper presents the measured data on interfacial tension of bentonite suspensions and strength of a cement stone in water solutions of Frem Giper S-TB superplasticizer. The interfacial tension of water-surfactant-bentonite suspension is experimentally measured at various concentrations of a bentonite solid phase. The dependence of interfacial tension on the concentration of a solid phase is quite complex. In particular, the minimum is observed on interfacial tension isotherms at 3 wt.% of bentonite. Isoplastic cement mixes are obtained from the above suspensions. The cement stone samples are made of these mixes. The strength test of these samples showed a considerable increase of the compression strength. At the same time, 3 wt.% of bentonite demonstrated the maximum increase in strength.

High-Strength Cement Composites Modified with a Complex Additive Hyper Plasticizer - Bentonite

“…With the combined use of bentonite with Odolit-K, the value of normal density differs from the control by 24%, a more intensive reduction of the liquid phase in the cement paste is noted. Obviously, such a distinctive feature manifests itself as a result of a decrease in the surface tension of the dispersion medium in the cement paste with the combined use of a hyper plasticizer and bentonite clay, which was reported in [7]. With the combined use of Odolit-K with bentonite, the limiting decrease in water's surface tension was 48.1 mN / m (34%).…”

“…These disadvantages greatly narrow the area of application of fine-grained concrete. Various methods improve fine-grained concrete quality, where modifiers play the main role [6][7]. Concretes obtained using chemical additives do not always and do not always meet the high requirements of materials approved for use in the construction of modern critical buildings and structures.…”

On Relationship of Surface and Structural Properties of Nano-Modified Cement Composites

“…[7]. In [8,9,17,18] emphasize that a decrease in the surface tension increases activity of the dispersion system, causes smoothing of the surface and condensation of the structure of the disperse system.…”