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First name, Middle name, Last name, Scientific degree, Scientific rank, Current position. Full and brief name of the organization, The organization address.Galautdinov A.R. – assistant E-mail: This e-mail address is being protected from spambots. You need JavaScript enabled to view it Mukhametrakhimov R.Kh. – candidate of technical sciences, associate professor E-mail: This e-mail address is being protected from spambots. You need JavaScript enabled to view it Kazan State University of Architecture and Engineering The organization address: 420043, Russia, Kazan, Zelenaya st., 1
Title of the articleImproving water resistance quality of gypsum cement-pozzolan binder based on low-strength gypsum
Abstract.The low water resistance of gypsum-cement-puzzolan binder based on low-braned gypsum with a low content of portland cement and active mineral additives limits its wide use in construction, as a result applying of bonding material with increased consumption of portland cement and active mineral additives is more dominate method. It is shown that one of the most effective ways to improve the water resistance of gypsum cement pozzolanic-based products which are made of the low-grade gypsum is a volume and surface hydrophobicity. In this scientific work, the effect of a number of water-soluble and water-insoluble hydrophobic additives on the rheological and mechanical properties, to determine their optimal content in the mixture was studied at the first stage. In the second stage features the combined action of hydrophobic and plasticizing additives were set, complex additives of multifunctional action was developed and patented. It was found that the most effective for the surface-hydrophobic gypsum cement pozzolanic stones are silicone composition to an organic solvent «Tiprom®M» and organic silicon compound «FES-50» (polyphenylethoxysiloxan) [C6H5Si(OC2H5)]n allowing to increase the compressive strength at 34 %, the softening rate – 95 %. The most effective for bulk hydrophobic gypsum cement-pozzolan binder based on low-grade gypsum are homogeneous mixture of oligoethoxysiloxan «Ethyl silicate-40» (RO-[-Si(OR)2 O-]m–R, R=C2H5), water emulsion of octyltriethoxysilane «Penta®-818» organosilicon compound «N-octyltriethoxysilane» C8H17Si(OC2H5)3, allowing to increase the compressive strength of gypsum cement-pozzolan brick by 44,7 %, flexural strength – by 9,5 %, softening factor – on 63,3-93,9 %. The developed multifunctional complex additive improves the compressive strength of 2,57 times, the flexural strength – 86 %, softening coefficient – 2,02 times. The samples of the following characteristics: compressive strength – 55,9 MPa, flexural strength – 19,5 MPa, softening coefficient – 0,99 – were obtained.
Keywords.gypsum cement-pozzolan binder, water resistance, water-repellency, the complex additive.
For citations:Galautdinov A.R., Mukhametrakhimov R.Kh. Improving water resistance quality of gypsum cement-pozzolan binder based on low-strength gypsum // Izvestiya KGASU. 2016. №4(38) P.333-343.


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