Architecture and Engineering (Mar 2020)
NON-REAGENT METHODS FOR THE ACTIVATION OF CONCRETE MIX RAW COMPONENTS IN THE CONSTRUCTION INDUSTRY
Abstract
Introduction: The paper presents an analysis of the practice of using non-reagent methods for the activation of raw components, in particular, mixing water for construction (cement, mortar, concrete) mixes. Purpose of the study: The study is aimed at the development of effective technologies to reduce the cost and improve the quality of work by activating the raw components of a concrete mix, in particular, mixing water, by non-reagent methods (physicomechanical effects) at various stages of the process of its preparation. Methods: The author conducts theoretical and experimental studies of the effect of mixing water activated by various non-reagent methods on the physico-mechanical and technological properties of concrete. Activated mixing water has a direct impact on hydration and crystallization processes, acceleration of binding agent hardening, etc. During mix preparation, a potential level of concrete quality characteristics is formed, which cannot be raised at the subsequent processing stages. The formation of concrete mix properties starts with mix preparation and continues during its transportation, laying, compaction and hardening. These operations determine concrete quality in building structures and its performance characteristics to a great extent. Results: Preparation of a construction (cement, mortar, concrete) mix is an important technological stage in concreting when constructing buildings and structures of cast-in-place concrete and reinforced concrete. In construction practice, various non-reagent methods are used: simple physical (mechanical mixing, heating, deaeration, ionization, etc.), ultrasonic (hydrodynamic processing, use of acoustic field, pulsed electric field processing, etc.), magnetic (constant, variable, pulsed field), and electric (constant, alternating field, high-voltage discharge, electric field of soluble electrodes, etc.). The analysis of various non-reagent methods used to activate mixing water shows that the phenomena occurring in water as a result of its treatment using some of the methods still have not been adequately explained. Nevertheless, the effectiveness of these methods is obvious, but deeper experimental and theoretical studies are needed.
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