Study of the Characteristics of Fine Binders for Injection in Construction
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The injection mixtures based on finely dispersed mineral binders (microcements) are widely used to obtain soil concrete by injection into permeable soils when solving various geotechnical problems. However, the question of assigning the consumption of materials to implement the requirements of a construction project remains poorly studied. Nowadays, the regulatory framework for these binders is practically not presented in the Russian Federation. There is no scientific basis for the formation of soil concrete, including there are no adequate dependencies like the Bolomey-Skramtaev formula for concrete. The series of experiments showing the inapplicability of the basic laws for standard concrete when creating soil concrete obtained by injection methods. Various types of finely dispersed binders used in geotechnical construction are considered. There were assessed penetration at different modes of preparation and injection of the mixture into the soil, and the characteristics of the resulting concrete. Two technologies for creating soil concrete - by mechanical mixing and by the method of injection impregnation of control samples of sandy soil were compared for compliance with the principles of regulatory documents for concrete. Significant differences between the properties of soil concrete obtained by the methods of injection impregnation and mixing are confirmed. Studies have confirmed the possibility of injection impregnation with binders of a certain composition in order to strengthen sandy soils in accordance with the assigned technological parameters. The coefficients of the efficiency of the use of micro binders during injection are shown, data on the parameters of the formed soil concrete.
KeywordsFine binder Injection Soil hardening Soil-concrete Microcement Micro-filler Impregnation injection
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