scholarly journals MAIN CHARACTERISTICS OF GRANULATED PHOSPHORUS SLAG (GPS) USED FOR BINDING MATERIALS MANUFACTURING

2021 ◽  
Author(s):  
З. А. Естемесов ◽  
Б. К. Сарсенбаев ◽  
Г. О. Қаршыга ◽  
Н. Б. Сарсенбаев ◽  
А.М. Шакей
Keyword(s):  
Porous Material ◽  
Portland Cement ◽  
Average Density ◽  
Basic Component ◽  
Water Cooling ◽  
Normative Documents ◽  
Hydraulic Activity ◽  
Review Analysis ◽  
Mineral Additive ◽  
To Receive

Обзорный анализ теоретических и экспериментальных известных работ показал, что ГФШ, полученный при охлаждении водой расплава с температурой 1450°С, является пористым материалом со средней плотностью 1200 кг/м3. Состоит он из трех фаз:стекло в количестве 90 - 95 %, минералы (достигает 10 %) и вредные газы (0,3 - 4 %). Благодаря повышенной гидравлической активности - ГФШ может быть использован в качестве минеральной добавки для портландцемента, одного из компонентов для шлакопортландцемента и основного компонента для шлакощелочных вяжущих с марочностью М500 и М1000 соответственно. Одновременно существуют нормативные документы, разрешающие получать вяжущие материалы без очистки и неразрешающие, если ГФШ не очищено от вредных газов. Анализ показывает необходимость применения ГФШ только в очищенном виде. The review analysis of theoretical and experimental known works showed that GPS obtained by water cooling of the melt with temperature 1450°C is a porous material with average density of 1200 kg/m3. It consists of three phases: glass in quantity 90 - 95 %, minerals (reaches 10 %) and harmful gases (0,3 - 4 %). Thanks to the increased hydraulic activity - GPS can be used as a mineral additive for Portland cement, one of the components for Portland cement slag and the basic component for slag-alkali binders with the stamps of M500 and M1000 respectively. At the same time there are normative documents allowing to receive binders without purification and unauthorized, if GPS is not purified from harmful gases. The analysis shows the necessity to use GPS only in purified form.

scholarly journals A Study of the Potential Use of Red Mud to Obtain Compositions Based on Portland Cement

2020 ◽  
Author(s):  
Ekaterina Gerasimova ◽  
Elizaveta Gumirova
Keyword(s):  
Portland Cement ◽  
Red Mud ◽  
Waste Product ◽  
Cement Stone ◽  
Mathematical Planning ◽  
Alumina Production ◽  
Mineral Additive ◽  
Composition Properties ◽  
Planning Of Experiments ◽  
Potential Use

The paper deals with the problem of utilization of red mud which is a waste product from alumina production using the Bayer method. The principal possible use for the red mud of JSC “Bogoslovsky aluminum plant” (Sverdlovsk region) for the compositions based on Portland cement is shown. It was found that the mud introduction accelerates beginning of the cement paste setting and thickens the paste reducing its mobility. It is concluded that the introduction of red mud up to 30 % is justified in terms of strength indicators. The work is carried out using mathematical planning of experiments. Keywords: red mud, Portland cement, active mineral additive, composition, properties, bauxite, chemical composition, cement stone strength, mathematical planning of experiments

scholarly journals Modeling the composition of fine-grained modified concrete elaborated with vibropressing technology

2019 ◽  
Vol 298 ◽  
pp. 00133 ◽  
Author(s):  
E. R. Pyataev ◽  
A. Y. Ushakov
Keyword(s):  
Portland Cement ◽  
Experimental Research ◽  
Frost Resistance ◽  
Building Materials ◽  
Road Construction ◽  
Average Density ◽  
Optimal Composition ◽  
Fine Grained ◽  
Main Components ◽  
Modifying Additive

The article analyzes the property requirements of small-piece products used in road construction, specially those related to water and frost resistance. It describes the main features of the vibration technologies involved in the manufacture of building materials, in particular, paving slabs. The article presents conclusive results, obtained through scientific research, which allow us to establish the influence of both, the costs of the main components and the parameters of vibration compression, on the properties of the final product. Combining the analysis of classical methods with the results of experimental research, a methodology has been developed for reaching an optimal composition of fine-grained vibropressed concrete modified with active additives. It is shown that the particular strength achieved from the combination of vibroformed fine-grained concrete, whose average density is 2270–2320 kg/m3, with polymer multifunctional modifiers, is mainly due to the use of Portland cement, a modifying additive, and the pressure conditions employed during the experiment..

scholarly journals SYNCHRONIZATION OF COMPETENCIES OF PRESCHOOL AND PRIMARY EDUCATION AS A REQUIREMENT OF NOWADAYS

2021 ◽  
pp. 473-476
Author(s):  
Oksana Yastrub
Keyword(s):  
Primary School ◽  
Primary Education ◽  
State Standard ◽  
Preschool Education ◽  
The State ◽  
Educational Process ◽  
Basic Component ◽  
Educational Institutions ◽  
Normative Documents ◽  
Preschool Period

The relevance of the study is due to the priority of the principles of continuity and prospects of modern education, compliance with which will ensure the holistic formation of personality during all years of study in educational institutions. Maintaining continuity with the preschool period of childhood, primary school ensures the further development of the child's personality, its physical, intellectual, social development; forms the value attitude to the state, native land, Ukrainian culture, health, ability to creative expression, critical thinking and more. Emphasis is placed on the need to synchronize the basic provisions of preschool and primary education, as bringing the content, forms and methods of formation of preschoolers' competencies in line with the requirements for personality set by the reform of the New Ukrainian School. The purpose of the article is to determine the main aspects of synchronization of preschool education with primary for the holistic formation of the child's competencies. In the process of scientific research methods of analysis, synthesis, generalization, systematization, inferences and comparisons were used to determine the main competencies and their synchronization with such normative documents as the Basic component of preschool education and the State standard of primary education. The competencies defined by the Basic component of preschool education and the State standard of primary education, built in accordance with the requirements of the Concept of the new Ukrainian school, have been synchronized. In the process of comparative analysis it was noted that each of the competencies of the Basic component of preschool education is defined by the competence in the State standard of primary school, which characterizes the continuity and prospects of preschool and primary education. Since the leading activity in preschool is play, the basic component is the formation of game competence, and in the primary school the educational process is built through play.

scholarly journals FOR THE STUDY OF PECULIARITIES OF STRUCTURE FORMATION OF COMPOSITE BINDERS FOR NON-AUTOCLAVED AERATED CONCRETE

2020 ◽  
pp. 41-47 ◽  
Author(s):  
V. Lesovik ◽  
M. Absimetov ◽  
M. Elistratkin ◽  
S. Shatalova
Keyword(s):  
Structure Formation ◽  
Raw Materials ◽  
Stage Structure ◽  
Average Density ◽  
Strength Performance ◽  
Molding Mixture ◽  
Autoclaved Aerated Concrete ◽  
Wide Range ◽  
Mineral Additive ◽  
Aerated Concrete

the basis of the modern market of cellular concrete is autoclaved gas silicate. At the same time, non-autoclaved aerated concrete is largely a more technological material, allowing the variation of its properties within a wide range, having a potentially wider field of application, less costly in the organization of production, which is of great importance for small and medium-sized businesses. The main problem of non-autoclaved aerated concrete is a higher cost of raw materials compared to silicate, and 20...30% lower strength performance. The proposed solution to this problem is the development of special composite binders with a limited content of clinker and mineral additives of various genetic types, taking into account the peculiarities of the two-stage structure formation of the material – gas porization and the formation of the microstructure of the stone. The article deals with some aspects of the interaction in the system “mineral additive – gypsum – by-products of the gas release reaction” in terms of the effect on the viscosity of the swelling mass and the strength of the stone at different times of hardening. Recommendations are given on the preferred compositions of composite binders and dosages of gypsum in the molding mixture when producing a material with an average density in the range of 500...700 kg/m3.

scholarly journals On effect of superplasticizers and mineral additives on shrinkage of hardened cement paste and concrete

2018 ◽  
Vol 196 ◽  
pp. 04018 ◽  
Author(s):  
Grigory Nesvetaev ◽  
Yulia Koryanova ◽  
Tatiana Zhilnikova
Keyword(s):  
Portland Cement ◽  
Cement Paste ◽  
Autogenous Shrinkage ◽  
Drying Shrinkage ◽  
Hardened Cement ◽  
Portland Cement Concrete ◽  
Cement Concrete ◽  
Hardened Cement Paste ◽  
Mineral Additive ◽  
Mineral Additives

A model describing the variation in autogenous shrinkage and drying shrinkage of portland cement concrete, depending on the volume of aggregates and the shrinkage of hardened cement paste, is presented. The equation to calculate shrinkage of concrete as a function of the volume of aggregates and shrinkage of a hardened cement paste was proposed. Formulas are proposed that describe the change in the shrinkage of hardened cement paste as a function of water/cement. The results of studies of the effect of superplasticizers and mineral additives on the autogenous shrinkage and the drying shrinkage of hardened cement paste are presented. Concretes made with superplasticizer and mineral additive may have the potential lower the value of drying shrinkage. The shrinkage value can be lowered from 30% till 70%. Concretes containing superplasticizers and mineral additives can potentially have the autogenous shrinkage reduced to 75%, or increased to 180%.

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