Influence of silicons of different structures on the hydration of compositional cements
Journal Title: Технологический аудит и резервы производства - Year 2018, Vol 6, Issue 3
Abstract
<p><em>The object of research is cement, which contains in its composition silica of various structures. The increase in the production of composite cements leads to the need to search for new active mineral additives. At the moment, the choice of mineral additives is made without taking into account the state in which the silicate component is located, therefore, it is necessary to develop certain criteria for the targeted selection of possible materials. This will reduce the cost of labor and financial resources to conduct relevant research.</em></p><p><em>As it is known, silicates can be in a crystalline, amorphous and glassy state; therefore, the reactivity of various additives, even with the same chemical composition, can also differ significantly. It is proposed to study the effect of silica structure on hydration processes and properties of cements.</em></p><p><em>The effect of silica in a different phase state (crystalline, amorphous, and glassy) on the hardening processes and physico-mechanical properties of composite cements has been investigated. It is established that the crystallinity degree of silica significantly affects the normal density of cement paste. Thus, the introduction of crystalline silica increases the normal thickness by 0.1–1.1 %, amorphous by 12.3–136.1 %, glassy by 11.2–56.2 %, compared with non-additive cement. The setting time of cement paste varies slightly.</em></p><p><em>In the early stages of hardening, the rate of drop in strength is highest with the introduction of amorphous silica. For example, when enter 10 wt. % of crystalline silica shows a slight increase in the strength of the samples, compared with 8.2 % non-additive cement. The same amount of amorphous silica additive reduces strength by 33 %, glassy silica – by 19.2 %. This trend continues with increasing content of additives.</em></p><p><em>The obtained research results allow to conclude that it is most appropriate to use in the production of composite cements mineral additives containing in their composition silica phases in a crystalline and glassy state.</em></p>
Authors and Affiliations
Vladimir Sokoltsov, Volodymyr Tokarchuk, Valentin Sviderskyi
Keywords
Related Articles
- EP ID EP527552
- DOI 10.15587/2312-8372.2018.148312
- Views 136
- Downloads 0
Research of the preconditions of forming a digital strategy of the enterprise to ensure its competitiveness
<p><em>The object of research is the formation processes of the digital strategy of enterprises in order to ensure competitiveness and development of the digital economy. One of the most problematic places is the formati...
Mathematical modeling of speed change of vehicles at emergency braking
<p><em>The object of research is the reconstruction of the development of the mechanism and circumstances of the road accident. The key point of research is establishment of the car speed at different moments in the deve...
Adjustment of air line structure for optimal transport management and electricity distribution
<p><em>The object of research is processes in air lines that affect the transportation and distribution of electricity. One of the most problematic places is the wires of overhead lines. The variety of wires with which t...
Study into energy efficiency of the drive of electric vehicles with an independent power supply depending on the configuration of the power source
<p><em>The electric vehicle with an independent power supply is the object of this research. At present, such vehicles are becoming more popular in the automobile market, pushing out their rivals with internal combustion...
The use of a balanced system of indicators for the management of construction enterprises
<p><em>The object of research is a balanced system of indicators (</em>BSI<em>), which is evaluated from the standpoint of its ability to use in the management of construction enterprises, taking into account the current...