osInternational Journal of Civil Engineering and Technology (IJCIET) Volume 10, Issue 04, April 2019, pp. 2170-2177, Article ID: IJCIET_10_04_224 Available online at http://www.iaeme.com/ijciet/issues.asp?JType=IJCIET&VType=10&IType=04 ISSN Print: 0976-6308 and ISSN Online: 0976-6316 © IAEME Publication Scopus Indexed EFFICIENCY OF SUPERPLASTICIZERS IN COMPOSITION OF SELF-COMPACTING CONCRETE MIXTURES Sergey D. Bartenev Institute of Construction and Architecture, National Research Moscow State University of Civil Engineering, Moscow, Russian Federation Valery V. Bausin Institute of Construction and Architecture, National Research Moscow State University of Civil Engineering, Moscow, Russian Federation Yevgenia V. Ivanova Institute of Construction and Architecture, National Research Moscow State University of Civil Engineering, Moscow, Russian Federation Vitaly Yu. Ermakov Institute of Construction and Architecture, National Research Moscow State University of Civil Engineering, Moscow, Russian Federation Leonid G. Novikov Institute of Construction and Architecture, National Research Moscow State University of Civil Engineering, Moscow, Russian Federation Ksenia Yu. Tkachenko Institute of Construction and Architecture, National Research Moscow State University of Civil Engineering, Moscow, Russian Federation Daria V. Gromova Institute of Construction and Architecture, National Research Moscow State University of Civil Engineering, Moscow, Russian Federation Vakhtang V. Nikolava Institute of Construction and Architecture, National Research Moscow State University of Civil Engineering, Moscow, Russian Federation \http://www.iaeme.com/IJCIET/index.asp 2185 editor@iaeme.com Efficiency of Superplasticizers in Composition of Self-Compacting Concrete Mixtures Georgiy S. Kazantsev Institute of Construction and Architecture, National Research Moscow State University of Civil Engineering, Moscow, Russian Federation Aleksandr E. Gerasimov Department of Construction of Thermal and Atomic Power Stations, Institute of Hydraulic Engineering and Power Plant Construction, National Research Moscow State University of Civil Engineering, Moscow, Russian Federation ABSTRACT One of the main conditions for producing self-compacting concretes is the use of superplasticizers with a relatively high content of dispersed materials in the form of Portland cement, mineral additives, ground fillers and / or very fine sand. Keywords: Superplasticizers, SNF, SMF, MLST, surfactant, Portland cement, polymethylene naphthalene sulfonates, mineral additives Cite this Article: Sergey D. Bartenev, Valery V. Bausin, Yevgenia V. Ivanova, Vitaly Yu. Ermakov, Leonid G. Novikov, Ksenia Yu. Tkachenko, Daria V. Gromova, Vakhtang V. Nikolava, Georgiy S. Kazantsev and Aleksandr E. Gerasimov. International Journal of Civil Engineering and Technology, 10(04), 2019, pp. 21702177 http://www.iaeme.com/IJCIET/issues.asp?JType=IJCIET&VType=10&IType=04 1. INTRODUCTION Superplasticizers are organic polyelectrolytes (surface active substances - surfactants), which function as a dispersed chemical medium in heterogeneous systems [1, 2], while their effectiveness is manifested in the ability to maintain the technological properties of concrete mixtures for at least 30 minutes - time, required for molding products [3]. Surfactants are most often used not as in individual products, but in compositions. This is due to a number of reasons, both economic and physico-chemical nature. For example, a mixture of high and low molecular weight surfactants. High-molecular surfactants determine the high stability of dispersed systems due to the creation on the surface of a durable gelatinous structured adsorption layer with a thickness of tens and hundreds of nanometers. Low molecular weight surfactants provide a high dispersing effect and greatly reduce the surface tension at the interface. As is well known [4-9], superplasticizers are divided into four basic types: the condensation products of sulfonated naphthalene-formaldehyde (SNF), sulfonated melamine-formaldehyde (SMF), the modified lignosulfonates technical (MLST) and polymers (II) comprising polyacrylates, polystyrene sulfonates, polycarboxylate esters. The mechanism of their action on disperse systems, in particular, cement pastes, is closely associated with the adsorption of clinker minerals on hydration products. Adsorption in cement systems obviously has its own characteristics - the chemical (spatial) structure of additive molecules or the structure of the adsorption layer may be of fundamental importance [10]. 2. PHYSICAL AND CHEMICAL PROPERTIES OF SUPERPLASTICIZERS The main factor determining the adsorption of polar compounds in aqueous solutions is the ability of water molecules to form hydrogen bonds both with the molecules themselves and http://www.iaeme.com/IJCIET/index.asp 2186 editor@iaeme.com Sergey D. Bartenev, Valery V. Bausin, Yevgenia V. Ivanova, Vitaly Yu. Ermakov, Leonid G. Novikov, Ksenia Yu. Tkachenko, Daria V. Gromova, Vakhtang V. Nikolava, Georgiy S. Kazantsev and Aleksandr E. Gerasimov with the surface of the adsorbent [11]. In turn, the adsorption mechanism of the plasticizing action of a surfactant involves the dissociation of ionic groups and their adsorption on the active centers of the surface of the solid phase and its hydrolysis [12]. According to A.M. Koganovsky [13, 14] on hydrophilic surfaces of oxides, hydroxides or aluminosilicates, the adsorption of polar organic molecules is possible only as a result of a specific (chemical or Coulomb) interaction, since the displacement of water (several molecules) requires a significant expenditure of energy. In this regard, the majority of superplasticizer molecules, which are anionic polyelectrolytes, are adsorbed on the positively charged minerals of Portland cement С3А and C4AF clinker, as well as their hydration products as a result of electrostatic interaction [15, 16]. At the same time, in the mechanism of action of superplasticizers of types SNF, SMF, MLST, the effect of electrostatic repulsion of cement particles and stabilization prevails, caused by the fact that the adsorption layers of additive molecules increase the -potential on the surface of cement particles to -23 ... -28 mV [17 -20]. On the contrary, dispersion and stabilization of cement pastes with the use of spatial polymeric molecules of modified polyacrylates and polycarboxylates is provided mainly due to the strong steric effect of repulsion of cement particles [21]. Due to the side hydrophobic polyether chains of polycarboxylate molecules, the duration of their plasticizing action is 3–4 times longer compared to sulfomelamine, sulfonaphthalene formaldehydes or lignosulfonates [22-24]. This ability allows not only to increase the mobility of the solution in the early periods, but also, as a rule, to maintain it for a longer period of time, which has a positive effect on the timing of transportation of concrete mixtures to the construction sites. The water-reducing effect of modern superplasticizers based on modified polycarboxylate esters ranges from 30 to 40% or more, while for modified lignosulfonates its value, as a rule, does not exceed 15%, and for sulfonated melamine (formaldehyde) formaldehyde condensates - 25% [2 , 5, 24]. At the same time, as is known, if the first-second generation superplasticizers are effective in mobile concrete mixtures and give a weak plasticizing effect with a low content of mixing water, then polycarboxylate superplasticizers provide a high plasticizing effect even in concrete mixtures with a water-cement ratio less than 0.2, which is a typical composition of high strength concrete. To achieve a similar effect in such mixtures, the dosage of SMF (SNF) superplasticizers should be three times higher [23]. However, additives based on polycarboxylate esters have their drawbacks [25]: - The problem of compatibility with cements of different chemical-mineralogical composition; - High sensitivity to low temperatures, which is especially important for the climatic conditions of Russia [26]; - Increased air entrapment, which can reduce the strength of concrete (1% entrained air reduces the tensile strength by about 4-5%) - with excessive air entrainment in the concrete mix, it is advisable to use additives that suppress this process [27]; - Special storage conditions - high humidity and ambient temperature must not be allowed; - High cost - according to [21], if the cost of type P superplasticizers (polycarboxylate, polyacrylate polymers) in terms of dry matter is taken as 100%, then the cost of the joint venture based on SMF condensates is 80%, SNF - 40%, MLST - 20%. 3. COMPATIBILITY IN THE "PORTLAND CEMENT SUPERPLASTICIZER" SYSTEM http://www.iaeme.com/IJCIET/index.asp 2187 editor@iaeme.com Efficiency of Superplasticizers in Composition of Self-Compacting Concrete Mixtures According to [4], compatibility in the "Portland cement superplasticizer" system involves the following parameters related to cement: chemical and mineralogical composition, in particular C3A content, alkali content and free lime, composition and type of calcium sulfate (dihydrate, basanite, anhydride), size cement particles. By taking into account the properties of the superplasticizer, the following factors matter: the chemical nature and average molecular weight, degree of polymerization, the amount of additive and the method of introduction into the concrete mix. With regard to concrete, the compatibility of additives with cement can be viewed as the ability of additives to provide the required technological effects and maintain them at a given level for a certain time, taking into account the action of various factors [28]. The loss of mobility by the concrete mix at the construction site is one of the main reasons, which leads to non-uniformity of strength and reduced durability of concrete in structures [29]. Some combinations of "Portland cement - superplasticizer" provide the level of the required mobility of the concrete mix for an hour, others - after 10-15 minutes show a tendency to its sharp decrease [1, 6]. According to [27], to assess the rheological activity of the joint venture in combination with specific cement, can be used the value of the shear stress limit of the cement paste. 4. INCOMPATIBILITY IN THE "PORTLAND CEMENT SUPERPLASTICIZER" SYSTEM The incompatibility in the "Portland cement - superplasticizer" system increases with an increase in the content of Portland cement in the clinker C3A tricalcium aluminate [30]. In concrete mixtures with the addition of naphthalene (melamine) formaldehyde condensates with an increase in the adsorption of superplasticizer on cement minerals and hydration products, the initial mobility increases. However, over time, the mobility of the mixtures decreases, which is due to the lack of a “free” superplasticizer in the volume of the pore fluid required for the electrostatic stabilization of the disperse system [31, 32]. The same picture is observed in the case of the use of polycarboxylate polymers - the higher the content of C3A, the greater the critical dose of the additive to achieve the desired plasticizing effect. However, the fluctuations in the chemical-mineralogical composition of cement, and especially the alkali content, are less susceptible to thinners based on sulfonated naphthalene formaldehyde condensates. At the same time, there is an inverse relationship between the amount of adsorbed polymethylene naphthalene sulfonate and the range of mobility values of cement pastes, which decreases with increasing adsorbed superplasticizer, and loss of mobility increases. According to researchs of N.M. Zaichenko [33], S. Jiang, C. Jolicoeur, B. Kim, T. Nawa, and others, the addition of sodium sulfate contributes to an increase in the mobility of cement paste as a result of a decrease in the adsorption value of the superplasticizer. In the presence of alkaline sulfate, adsorption on C3A and C4AF is inhibited and increased by C3S and β-C2S, and the total amount of adsorbed plasticizer decreases, its concentration increases in the liquid phase of the concrete mix, which causes dispersion of particles and decrease in viscosity of cement paste [28]. This fact suggests that, under certain conditions, superplasticizers based on polymethylene naphthalene sulfonates can be successfully used in self-compacting concrete mixtures, despite the fact that [34] states that only PCE superplasticizers can be used for these purposes. It should also be noted that SNF-superplasticizers to a lesser extent affect the air entrainment in the concrete mix. So, according to [35], regardless of the type of air-entraining surfactant additive used, the SNF-superplasticizer reduces water separation and does not have air-entraining action, and also has almost no effect on air entrapment caused by the airhttp://www.iaeme.com/IJCIET/index.asp 2188 editor@iaeme.com Sergey D. Bartenev, Valery V. Bausin, Yevgenia V. Ivanova, Vitaly Yu. Ermakov, Leonid G. Novikov, Ksenia Yu. Tkachenko, Daria V. Gromova, Vakhtang V. Nikolava, Georgiy S. Kazantsev and Aleksandr E. Gerasimov entraining surface-active additive. However, on the other hand, it has been shown [36] that the use of SNF superplasticizers in conjunction with cellulose ethers leads to the formation of hydrogen bonds between additives and a reduction in the water-reducing effect of the plasticizing additive. In addition, increasing the dosage of the stabilizing additive with a constant amount of plasticizer and the normal resistance to delamination of self-compacting concrete mixture leads to a slight decrease in the strength characteristics of concrete. Therefore, self-compacting concrete mixes with polymethylene naphthalene sulfonates need to be manufactured according to the first type - powder, using a large amount of finegrained mineral materials. Yu.M. Bazhenov and P.G. Komokhov noted that the effectiveness of the additive superplasticizer depends largely on the method of its introduction into concrete. The best results are obtained, for example, when the mineral additive is silica fume or a mixture of silica fume with fly ash, mixed with superplasticizer in advance. This approach became the basis for the creation of complex modifiers on an organic-mineral basis using superplasticizers of a new generation, active and low-active mineral additives. M.M Alonso and other researchers. In their studies noted that polycarboxylate is well adsorbed not only by grains of cement, but also by mineral fillers. At the same time, the amount of additive adsorbed on the surface of fly ash and blast furnace slag is slightly less than on the surface of limestone. Due to the presence of negatively charged functional sulfo groups, molecules of polymethylene naphthalene sulfonates are also capable of adsorbing on the active centers of the surface of mineral additives. With an increase in the surface charge, the adsorption of additives increases [37]. The research of Yu.V. Degtev [38] showed that the amount and type of mineral additives, as well as the dispersion of all components of the composite binder, form its capacity by adsorption of a superplasticizer. By trying to increase this capacity, i.e. maximum value of the effective dosage, due to the mineral additives in the composition of the composite binder, it is possible to increase their suitability for use in the compositions of self-compacting concrete mixtures. The adsorption activity of mineral additives (fillers) is also associated with their hydraulic activity. According to [39], the presence of low hydraulic activity of mineral additives in concrete enhances the plasticizing effect of the C-3 superplasticizer, and a smaller amount of additive is required to produce cast concrete mixes, on the contrary, the plasticizing effect of C-3 in concrete mixtures with highly active mineral additives is lower, and the effective dosage C -3 increases dramatically. Thus, concrete mixtures containing microsilica as an additive, even at a dosage of up to 10%, require an increased consumption of superplasticizers [40]. 5. 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