COMBINED PROCESSING OF MIXING WATER FOR CEMENT SYSTEMS

Relevance: The priority field in modern materials science in construction is the creation of cement compositions and technologies which will meet technological availability and efficiency, environmental safety, biocompatibility, natural balance, economic viability and energy resource conservation. Purpose: The aim of this work is to study a combined effect of the ultrasound and the constant magnetic field, both with predetermined frequency and intensity, and the effect of modified mixing water on the properties of cement systems. Methodology/approach: The experiment used an ultrasonic device USU-0707 to modify water properties, a magnetic system configuration for magnetic field processing of specimens, and DRON-4 diffractometer for the
X-ray phase analysis. In order to measure the compressive strength, (2×2×2)10^–2 m specimens were prepared from cement paste. The water/cement ratio was selected as 0.38. Findings: A combined processing of mixing water with the ultrasound and the constant magnetic field results in a substantial increase in service characteristics of the cement brick. In comparison with test specimens, its compressive strength increases by 30–45 %. Research implications: The ultrasonic dispersion of mixing water is accompanied by such processes as the formation of various short-living particles and states in water, cavitation and others which, in turn, are sensitive to the magnetic field. As a result, the reactive capacity of water in relation to cement sharply increases and, as a consequence, the growth in cement strength is observed. Practical implications: The proposed method of the ultrasonic and magnetic-field modification of mixing water can be readily used in the production of cement-based construction materials.

water, mixing water, ultrasound, magnetic field, cement system, strength

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