Enclosure design is the most important stage of product development. A proprietary enclosure has many advantages as well as disadvantages. The most important part of the design of an electronic device enclosure is the preliminary research stage. Each device has its own technological peculiarities, which are taken into account during the development of concepts. This article presents the peculiarities of the development of enclosure for wireless sensor for monitoring of reinforced concrete structures, discusses the important aspects of each stage.
Concrete strength gain can be significantly affected by the initial characteristics of the raw materials. Unfortunately, information on the potential influence of the initial water pH on concrete strength gain is still scarce. In this study, the potential effects of the initial water pH on concrete strength gain were investigated using a combination of sensors and a sclerometric test. The impact of initial pH on the strength gain process was investigated using three distinct pH values (4.0, 7.0, and 12). The primary variables examined were pH variations over time, internal temperature, and strength gain. The problem was further examined using a number of statistical techniques, including Single-way Analysis of Variance, Scheffé’s approach, and Correlation Matrixes. When the temperature data from 4.0, 7.0, and 12 pH values were put through the Analysis of Variance, a p-value of 2.4 × 10−261 was retrieved. Additionally, when the strength gain data from 4.0, 7.0, and 12 pH values were subjected to the Analysis of Variance, a p-value of 2.9 × 10−168 was retrieved. The results showed that the differences in the list data retrieved from the investigated pH values were statistically significant. Based on the results, we can state that the initial pH level in the mixing water can have noticeably varied consequences in terms of the strength gain of the concrete and should be carefully considered during the preparation process of concrete. The findings retrieved from this study provide a piece of useful information in the construction field, especially with concrete strength management.
The given article is devoted to research of influence of polymer modifiers and mineral additives on quality of composite aerated concrete products. When selecting the composition of composite aerated concrete local raw materials and components were used: portland cement, sand, aluminum powder, polyvinyl acetate, fly ash, post-alcoholic bard and whey of milk. Preliminary polyvinyl acetate was combined with binder mixing water at a temperature above 55ºC to obtain a readily soluble polymer emulsion. Dispersion was carried out with a rotary-pulsation apparatus at a pressure of 0.5-1.0 MPa and a rotor speed of ~1200 rpm. In the same apparatus the complex modifier was produced. The offered technology of production of a complex modifier seems to be the most effective for composite aerated concrete. It made it possible to reduce water absorption and capillary suction of composite aerated concrete by an average of 25% and 45%, respectively. Moreover, different combinations of fly ash, polymer and modifier made it possible to achieve optimal values of thermal conductivity, compressive strength and frost resistance of composite aerated concrete.
В статье рассмотрены вопросы улучшения качества ячеистого бетона путем применения ряда технологических процессов, позволяющих значительно улучшить потенциал используемых компонентов и при этом получить материал с высокими качественными показателями.Проведены исследования композиционного газобетона с улучшенными физикомеханическими свойствами. Для получения высоких показателей качества в технологии применяли роторно-пульсационный аппарат, который, создавая высокочастотные колебания, сопровождающиеся кавитацией, обеспечил получение качественной эмульсии полимерного компонента и алюминиевой пудры. За счет качественного омыления газообразователь равномерно распределился по структуре раствора и вступил в реакцию с цементным вяжущим, создав равномерное поровое пространство. А полимерный компонент, обволакивая пору, обеспечил гидрофобность материала и усилил его прочность.Ключевые слова: газобетон; модификатор; полимерный компонент; морозостойкость; теплоизоляция; эмульсия; диспергатор.Для цитирования: Сабитов Е.Е., Дюсембинов Д.С., Базарбаев Д.О. Исследование свойств композиции бетона с использованием полимерной эмульсии // Вестник Томского государственного архитектурно-строительного университета.The paper deals with the quality of gas concrete by using a number of process technologies that can significantly improve the potential of the added components. The proposed technology for composite gas concrete production improves its physical-and-mechanical properties due to the use of a rotary-pulsation apparatus, which creates high-frequency vibrations accompanied by cavitation and produced a high-quality polymer emulsion and the aluminum powder. Due to high-quality saponification, the gasifier evenly distributes in the concrete paste structure and reacts with the cement binder, thereby creating a uniform pore space. And the polymer emulsion envelopes pores and improves the material hydrophobicity and strength.
The proposed method of production of composite aerated concrete using industrial wastes: ash from hydrotreatment, post-alcoholic bard. The evaluation of physical and mechanical properties of gas concrete produced by the proposed technology is made in comparison with other technologies, including the classical production technology. The basic estimated parameters, were: terms of setting and strength of a binder; durability, water absorption and thermal conductivity of a material. The obtained test results of the binder showed a decrease in the setting time and an increase in the strength of the proposed aerated concrete compared with other, compared samples. The obtained results of water absorption of the proposed aerated concrete showed minimum values, and the strength maximum (compared with other technologies), which indicates a positive synergy effect, i.e. strengthening the qualities of the material as a result of mutual work of the post-alcoholic bard and polymer component in the composition of the material. However, the results of the thermal conductivity of the proposed aerated concrete showed values lower than the classical one, indicating that the use of modifier additives cannot be a good solution for improving the physical and mechanical properties of gas concrete structurally related to thermal insulation. In general, the results of water absorption, strength and thermal conductivity showed more consistent results (compared to other technologies), with minimal variation in the data, which indirectly confirms the better homogeneity of the proposed gas concrete.
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