Improving Performance of Water-Reducing Admixtures by Modification of Quartz Sands with Electrolyte

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It is widely known that modern anionic surfactants are adsorbed at positively charged active centers of hydrate phases in portland cement that leads to floccules decomposition as well as a release of immobilized water, therefore increasing cement paste flowability. Normally, in cement based concrete such fine and coarse aggregates as quartz sand, granite, sandstone etc. are used. They contain negatively charged active centers, therefore, are inert to anionic water-reducing admixture and don’t affect fluidization of cement based concrete mixture. For instance, quartz sand with high concentration of fine particles as well as oxides and hydroxides of Al and Fe cations demonstrates a higher reactivity to anionic water-reducing admixtures. In order to increase the efficiency of anionic surfactants in concrete mixtures the treatment of aggregates with salts based on two-and three-valent cations was proposed. That provides a higher concentration of positively charged active centers on quartz sand surface leading to increase of flowability of concrete mixture.

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Edited by:

Dr. Denis Solovev

Pages:

141-146

Citation:

S.M. Rakhimbayev et al., "Improving Performance of Water-Reducing Admixtures by Modification of Quartz Sands with Electrolyte", Materials Science Forum, Vol. 945, pp. 141-146, 2019

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February 2019

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[1] Lee F.M. Cement and concrete chemistry. Moscow. Stroyisdat. (1961) 546.

[2] Taylor H.F. Cement chemistry. Moscow. Mir. (1996) 560.

[3] Ramachandran V.S. Additives for concrete. Moscow. Stroyisdat. (1988) 581.

[4] Pouchet S., Pochard I., Brunel F., Perrey D. Chemistry of the calcite/water interface: Influence of sulfate ions and consequences in terms of cohesion forces. Cement and Concrete Research. 52 (2013) 22–30.

DOI: https://doi.org/10.1016/j.cemconres.2013.04.002

[5] Vovk A.I. Hydration of tricalcium aluminate С3А and «С3А + gypsum» combination with surfactant, Colloid Journal. 62 (1) (2000) 31–38.

[6] Vovk A.I. Adsorption of surfactant at hydration products of Portland cement clinker. Colloid Journal. 62(2) (2010) 161–169.

[7] Vovk A.I. In regard of features of application of hyperplasticizers. Concrete technology. 6 (2007) 12–13.

[8] Shapovalov N.A., Kosuhin M.M., Slusar A.A. Mechanism of liquidizing agents action in cement-bearing construction composites, Proceeding of Int. research-to-practice conference «Problem in construction material science and new technologies». Belgorod. (2000) 464–470.

[9] Yadyikina V.V., Lukash E.A. Enhancement of efficiency of concrete by surface modification of disperse mineral fillers. Concrete Technologies. 1(90) (2014) 16–18.

[10] Rakhimbaev Sh. M., Tolyipina N.M., Hahaleva E.N. Method of diversification ofvfine aggregates for construction industry. Proceeding of Int. Research-to-Practice Conference «Energy- and source-saving environmentally friendly chemical and technological processes for environmental protection». Belgorod: BSTU. 3 (2015) 237–242.

[11] Tkach E.V., Semenov V.S., Tkach S.A. Study of influence of organo-mineral additives on performance characteristics of fine-aggregate concrete. Industrial and Civil Engineering. 9 (2013) 16–19.

[12] Rakhimbaev Sh. M., Tolyipina N.M. Enhancement of corrosion stability of concrete by rational choice of binder and aggregates. Monography. Belgorod: BSTU. (2015) 321.

[13] Rakhimbaev Sh. M., Tolyipina N.M., Gudkova E.A. Effect of electrostatic surface characteristics of aggregate on liquidizing ability of superplastisizer S-3, Journal Technique and Technology of Silicates. 20 (1) (2013) 2–4.

[14] Rakhimbaev Sh. M., Tolypina N.M., Khakhaleva E.N. Influence of fine aggregate on efficiency of liquidizing agents, Vestnik SibADI. 3 (49) (2016) 74–79.

[15] Rakhimbaev Sh. M., Tolyipina N.M., Karpacheva E.N. Liquidizing effect of super- and hyper-plasticizers depending of type of fine aggregate, Proceeding of Int. research-to-practice conference, Belgorod. 4 (2011) 198-202.

[16] Bazhenov Yu. M. Concrete technology. Moscow. ACB (2002) 500.