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Urban development and spatial planning
Article . 2020 . Peer-reviewed
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ANALYSIS OF STRUCTURAL STATES HARDENING BINDER BY CONTINUITY OF THE EXPERIMENTAL CURVE

Authors: Kersh, Vladimir; Kolesnikov, Andrey; Khlytsov, Nikolay; Foshch, Alena;

ANALYSIS OF STRUCTURAL STATES HARDENING BINDER BY CONTINUITY OF THE EXPERIMENTAL CURVE

Abstract

Развитие строительной отрасли Украины требует постоянного совершенствования строительных технологий, материалов и изделий. Достаточно перспективными являются высоконаполненные теплозвукоизолирующие композиты на основе гипса. Для быстротвердеющих материалов на гипсовых вяжущих важной характеристикой являются сроки схватывания, знание которых чрезвычайно важно в практике использования формовочных и штукатурных смесей, а также в технологии наливных полов. Определение сроков схватывания композиций сложной структуры стандартным методом Вика становится невозможным – крупные частицы блокируют погружаемый индентор. В таких случаях для определения сроков схватывания может использоваться свойство, тесно связанное с твердением ­– пластическая прочность, электропроводность, температура. Наблюдаемые при их измерении зависимости носят плавный, непрерывный характер и по ним непосредственно определить сроки схватывания невозможно. В работе предложена методика извлечения скрытой информации из экспериментальных данных, основанная на процедуре преобразования координат. В качестве примера для реализации предлагаемой методики используются данные по пластической прочности. С помощью нормирования экспериментальных данных и перехода к повторно-логарифмическим координатам в работе осуществляется разбиение периода твердения на основные стадии, характеризующиеся постоянством условий структурообразования. Они отделены друг от друга переходными этапами, время наступления которых приближенно соответствует срока схватывания, измеренным нормативным методом. Предложенный алгоритм обработки экспериментальных данных, имеет достаточно универсальный характер и позволяет выявлять стадии структурообразования и переходные этапы, соответствующие срокам схватывания, на основе данных и по другим свойствам, например, по электропроводности и скорости ультразвука. Это позволяет эффективно использовать данную методику для контроля процессов структурообразования высоконаполненных композиционных смесей.

The development of the building industry inUkrainerequires continuous improvement of building technologies, materials and products. Highly filled gypsum-based heat and sound insulating composites are quite promising. For fast hardening materials on gypsum binders, an important characteristic is the setting time, the knowledge of which is extremely important in the practice of using molding and plaster mixtures, as well as in the technology of bulk floors. Determining the timing of setting compositions of complex structure with the standard Vikat method becomes impossible - large particles block the immersed indenter. In such cases, a property closely related to hardening – plastic strength, electrical conductivity, temperature can be used to determine the setting time. The dependences observed during their measurement are smooth, continuous, and it is impossible to directly determine the setting time from them. The paper proposes a technique for extracting hidden information from experimental data, based on the coordinate transformation procedure. As an example, to implement the proposed methodology, data on plastic strength are used. Using the normalization of experimental data and the transition to re-logarithmic coordinates, the hardening period is divided into the main phases, characterized by the constancy of the conditions of structure formation. They are separated from each other by transitional stages, the onset of which approximately corresponds to the setting time measured by the normative method. The proposed experimental data processing algorithm is quite universal and makes it possible to identify structural formation phases and transitional stages corresponding to setting time also based on data on other properties, for example, electrical conductivity and ultrasound speed. This allows you to effectively use this technique to control the processes of structure formation of highly filled composite mixtures.

Keywords

gypsum; compositions; plastic strength; experimental data processing; structure formation; hardening; setting time, гипс; композиции; пластическая прочность; обработка экспериментальных данных; структурообразование; твердение; сроки схватывания

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
1
Average
Average
Average
gold