Effective Highly Dispersed Additive for Concretes on the Basis of Natural Mineral Raw Materials

Abstract:

The composition of a highly dispersed additive for concrete based on the natural mineral raw material wollastonite is developed. The properties of the modified fine-grained concrete (FGC) are studied. The three-factor experiment planning made it possible to obtain mathematical dependences of the bending and compressive strength after 3 and 28 days of hardening, density, and water-cement ratio of the fine-grained concrete on such factors as the content of anionic surfactant of naphthalene-formaldehyde type in the composition of the raw material wollastonite being an activator of mechanic-chemical processing, the suspension stabilizer of the pre-activated material, and the content of S-3+wollastonite in powder after mechanic-chemical activation in the suspension. The dependence nomograms are built. The optimal strength parameters of the modified fine-grained concrete with the content of a highly dispersed additive of 5% by weight of cement in its composition, and the wollastonite concentration of 3 g/l in the water medium of the suspension stabilizer S-3 are ascertained. The developed highly dispersed additive allows obtaining fine-grained concrete with the bending strength of 3.1 MPa and the compressive strength of 57.8 MPa.

• Periodical: Materials Science Forum (Volume 992)
• Pages: 168-172
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.992.168
• Online since: May 2020
• Authors: E.G. Karpikov*, N.P. Lukutsova, E.A. Bondarenko
• Keywords: Fine-Grained Concrete, Highly Dispersed Additive, Strength, Wollastonite

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