scholarly journals FORMATION OF THE STRUCTURE OF MULTICOMPONENT ALKALI BASIC KNITTING SYSTEMS

2020 ◽  
pp. 48-56
Author(s):  
С-А. Ю. Муртазаев ◽  
М. Ш. Саламанова
Keyword(s):  
Portland Cement ◽  
Raw Materials ◽  
Multicomponent System ◽  
Cement Stone ◽  
Urgent Problem ◽  
Technological Method ◽  
Relevant Today ◽  
Scientific Schools ◽  
Fundamental Research ◽  
Scientific Project

Использование бетонов на чистом портландцементе сегодня не столь актуально, так как ведущие научные школы мира в этом направлении стараются получать композиты на смешанных вяжущих, путем замены дорогого и энергоемкого портландцемента. Поэтому разработка современных эффективных композитов на основе бесклинкерных вяжущих щелочной активации, безусловно, является актуальной проблемой. В основу проведенных исследований положен современный технологический прием, способствующий получению прочного и долговечного цементного камня, без применения традиционного портландцемента. Результаты проведенных исследований подтверждают совместимость всех компонентов многокомпонентной системы «минеральный порошок - щелочной затворитель - ПАВ», а предлагаемый технологический прием позволит получать прочные и долговечные строительные композиты по бесклинкерной технологии, без применения дорогого и энергоемкого портландцемента. Работа выполнена в рамках исследований по реализации научного проекта № 18-48-200001 «Высококачественные бетоны с повышенными эксплуатационными свойствами на основе местного природного и техногенного сырья», получившего поддержку Российского фонда фундаментальных исследований» (РФФИ). The use of concrete on pure Portland cement is not so relevant today, as the leading scientific schools of the world in this direction are trying to obtain composites on mixed binders by replacing expensive and energy-intensive Portland cement. Therefore, the development of modern effective composites based on clinkerless alkaline binders is certainly an urgent problem. The research is based on a modern technological method that contributes to the production of strong and durable cement stone, without the use of traditional Portland cement. The results of the studies confirm the compatibility of all components of the multicomponent system “mineral powder - alkaline caster - surfactant”, and the proposed technological method will allow to obtain strong and durable building composites using clinker-free technology, without the use of expensive and energy-intensive Portland cement. The work was implemented as part of research on the fulfillment of scientific project No. 18-48-200001 “High-quality concrete with enhanced performance properties based on local natural and secondary raw materials,” which received support from the Russian Foundation for Fundamental Research (RFFR).

scholarly journals FEATURES OF TECHNOLOGY FOR PRODUCING MIXED BINDERS BASED ON SMALL NON-CONDITIONAL SANDS

2020 ◽  
pp. 66-71
Author(s):  
М. С. Сайдумов ◽  
А. Ш. Джандаров ◽  
Т. С-А. Муртазаева
Keyword(s):  
Portland Cement ◽  
Raw Materials ◽  
Physicomechanical Properties ◽  
High Quality ◽  
Performance Properties ◽  
Secondary Raw Materials ◽  
Fundamental Research ◽  
Scientific Project

В работе представлены результаты исследований некоторых особенностей получения смешанных вяжущих на основе мелких некондиционных песков. Разработаны теоретические положения повышения эффективности использования мелких песков в вяжущих путем их активации. Получены рецептуры смешанных вяжущих веществ на основе портландцемента, наполнителя из мелких песков и суперпластификатора «Мелфлюкс» и исследованы их основные технологические и физико-механические свойства. Работа выполнена в рамках исследований по реализации научного проекта № 18-48-200001 «Высококачественные бетоны с повышенными эксплуатационными свойствами на основе местного природного и техногенного сырья», получившего поддержку Российского фонда фундаментальных исследований» (РФФИ). The paper presents the results of studies of some features of obtaining mixed binders based on fine substandard sand. Theoretical provisions have been developed to increase the efficiency of the use of fine sands in binders by activating them. Formulations of mixed binders based on Portland cement, a filler from fine sands and Melfluxsuperplasticizerwere obtained and their main technological and physicomechanical properties were investigated. The work was implemented as part of research on the fulfillment of scientific project No. 18-48-200001 “High-quality concrete with enhanced performance properties based on local natural and secondary raw materials,” which received support from the Russian Foundation for Fundamental Research (RFFR).

scholarly journals THEORETICAL BASIS OF COMPATIBILITY OF COMPLETELY-FILLED MULTICOMPONENT BINDING SYSTEMS

2020 ◽  
Vol 47 (1) ◽  
pp. 165-173
Author(s):  
M. Sh. Salamanova ◽  
S. A.Yu. Murtazaev ◽  
D. K.-S. Bataev ◽  
A. Kh. Alaskhanov
Keyword(s):  
Portland Cement ◽  
Raw Materials ◽  
Multicomponent System ◽  
Potassium Feldspar ◽  
Cement Stone ◽  
Multicomponent Systems ◽  
Russian Science ◽  
Unique Identifier ◽  
Factors Affecting ◽  
Mineral Powder

Abstract. Aim. An important direction in contemporary concrete science is aimed at the development of multicomponent systems using mineral powder fillers in a finely dispersed state to create strong and durable building composites. One of the most significant factors affecting the properties of multicomponent systems is the compatibility of its components. Efforts on the part of leading scientific institutes are aimed at replacing expensive and energy-intensive Portland cement with composite concrete products produced using mixed binders. In this context, the development of modern effective composites based on clinkerless alkaline binders becomes an urgent problem. Methods. Studies into the compatibility of multicomponent cementing systems are based on a contemporary technological approach that contributes to the production of strong and durable cement stone, without the use of traditional Portland cement. Results. Electron probe studies and X-ray phase analysis of concrete produced using a clinker-free alkaline activation binder showed that the studied multicomponent system contains a hydro-aluminosilicate zeolite phase of variable composition, as well as indicating the presence of calcite, quartz, albite feldspar, mica, zeolites and potassium feldspar. Conclusion. The results of the studies confirm the compatibility of all components of the multicomponent system comprised of mineral powder, alkaline coater and surfactant. The proposed technological method can be used to produce strong and durable building composites with clinker-free technology avoiding the use of expensive and energy-intensive Portland cement. Acknowledgments. The work was performed as part of research on the implementation of scientific project No. 05.607.21.0320. “Development of technology for new building composites on clinker-free alkaline binders using substandard natural and secondary raw materials” which received support from the federal target program “Research and Development in Priority Directions for the Development of the Russian Science and Technology Complex for 2014-2020.” Unique identifier for the agreement RFMTFI60719X0320.

scholarly journals INFLUENCE OF GRANULOMETRIC COMPOSITION OF AGGREGATES ON THE PROPERTIES OF CONCRETE AND MORTAR MIXTURES

2020 ◽  
pp. 57-63
Author(s):  
М. С. Сайдумов ◽  
Т. С-А. Муртазаева ◽  
А. Х. Аласханов ◽  
В. А. Байтиев
Keyword(s):  
Particle Size ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Raw Materials ◽  
Grain Composition ◽  
Maximum Particle Size ◽  
Fundamental Research ◽  
Scientific Project ◽  
Maximum Particle ◽  
Effect Of Particle Size

Технологические и эксплуатационные свойства бетонных и растворных смесей формируются за счет правильного учета в их рецептуре таких показателей, как форма и характер поверхности зёрен, зерновой состав, межзерновая пустотность, водопотребность и предельный размер частиц. Поэтому для проектирования доброкачественного состава необходимо изучить влияние гранулометрического состава мелкого и крупного заполнителей на основные свойства бетонных и растворных смесей. В работе поставлена цель оптимизировать гранулометрический состав заполнителей. Работа выполнена в рамках исследований по реализации научного проекта № 18-48-200001 «Высококачественные бетоны с повышенными эксплуатационными свойствами на основе местного природного и техногенного сырья», получившего поддержку Российского фонда фундаменталь- ных исследований» (РФФИ). The technological and operational properties of concrete and mortar mixtures are formed due to the correct consideration in their formulation of indicators such as the shape and nature of the surface of the grains, grain composition, intergranularvoidness, water demand and maximum particle size. Therefore, to design a benign composition, it is necessary to study the effect of particle size distribution of small and large aggregates on the basic properties of concrete and mortar mixtures. The goal is to optimize the particle size distribution of aggregates. The work was implemented as part of research on the fulfillment of scientific project No. 18-48-200001 “High-quality concrete with enhanced performance properties based on local natural and secondary raw materials,” which received support from the Russian Foundation for Fundamental Research (RFFR).

Recipes of Knitting Systems Alkaline Activation Using Natural Raw Materials of the Chechen Republic

2020 ◽  
Vol 1011 ◽  
pp. 1-7
Author(s):  
Madina Salamanova ◽  
Dena Bataev ◽  
Aminat Uzayeva ◽  
Zurab Gacayev
Keyword(s):  
Raw Materials ◽  
Practical Importance ◽  
Cement Stone ◽  
Russian Science ◽  
Unique Identifier ◽  
Federal Target Program ◽  
Energy Consuming ◽  
Scientific Project ◽  
Alkaline Activator ◽  
Theoretical Foundations

The alkaline clinker-free binders formulations activation development based on fine powders of aluminosilicate nature will allow to obtain the effective building composites. The paper reveals the issues related to the theoretical foundations of the cement stone structure and strength formation based on the alkaline activator. The research results, in our opinion, are undoubtedly of practical importance for the construction industry, since the proposed recipes for clinker-free cements will replace the expensive and energy-consuming Portland cement, allowing to create strong and durable concrete and reinforced concrete structures. The results presented in this article have been obtained in the framework of research on the implementation of scientific project No. 05. 607.21.0320. “Development of technology for new building composites on clinker-free alkaline binders using substandard natural and secondary raw materials” which received support from the federal target program “Research and Development in Priority Directions for the Development of the Russian Science and Technology Complex for 2014-2020”. The unique identifier for the agreement is RFMTFI60719X0320.

scholarly journals Strength Development and Elemental Distribution of Dolomite/Fly Ash Geopolymer Composite under Elevated Temperature

Materials ◽  
2020 ◽  
Vol 13 (4) ◽  
pp. 1015 ◽  
Author(s):  
Emy Aizat Azimi ◽  
Mohd Mustafa Al Bakri Abdullah ◽  
Petrica Vizureanu ◽  
Mohd Arif Anuar Mohd Salleh ◽  
Andrei Victor Sandu ◽  
...  
Keyword(s):  
Elevated Temperature ◽  
Fly Ash ◽  
Portland Cement ◽  
Ordinary Portland Cement ◽  
Raw Materials ◽  
Liquid Sodium ◽  
Strength Development ◽  
Elemental Distribution ◽  
Distribution Analysis ◽  
Geopolymer Composites

A geopolymer has been reckoned as a rising technology with huge potential for application across the globe. Dolomite refers to a material that can be used raw in producing geopolymers. Nevertheless, dolomite has slow strength development due to its low reactivity as a geopolymer. In this study, dolomite/fly ash (DFA) geopolymer composites were produced with dolomite, fly ash, sodium hydroxide, and liquid sodium silicate. A compression test was carried out on DFA geopolymers to determine the strength of the composite, while a synchrotron Micro-Xray Fluorescence (Micro-XRF) test was performed to assess the elemental distribution in the geopolymer composite. The temperature applied in this study generated promising properties of DFA geopolymers, especially in strength, which displayed increments up to 74.48 MPa as the optimum value. Heat seemed to enhance the strength development of DFA geopolymer composites. The elemental distribution analysis revealed exceptional outcomes for the composites, particularly exposure up to 400 °C, which signified the homogeneity of the DFA composites. Temperatures exceeding 400 °C accelerated the strength development, thus increasing the strength of the DFA composites. This appears to be unique because the strength of ordinary Portland Cement (OPC) and other geopolymers composed of other raw materials is typically either maintained or decreases due to increased heat.

Preparation of Alternative Hydraulic Binder Based on Secondary Raw Materials

2014 ◽  
Vol 1000 ◽  
pp. 12-15
Author(s):  
Jiří Švec ◽  
Tomáš Opravil ◽  
Jiří Másilko
Keyword(s):  
Portland Cement ◽  
Raw Materials ◽  
Construction Materials ◽  
High Volume ◽  
Point Of View ◽  
Hydraulic Lime ◽  
Combustion Gases ◽  
Secondary Raw Materials ◽  
Hydraulic Binder ◽  
Massive Scale

Reusing and recycling of secondary raw materials from high-volume industrial productions (especially form construction materials and binders fabrications) is very important way of conserving environment and it is also interesting from the economical point of view. The production of common hydraulic binders, especially Portland cement, burdens the environment with considerable amount of combustion gases and consumes energy in massive scale. Alternative (low – energy) binder can be used as Portland cement substitution in applications with lower mechanical properties requirements. Mined limestone wash sediments contain large amount of clay components, but there is also indispensable share of fine calcite. This composition makes these sediments a promising material for the preparation of hydraulic binders as Roman cement or hydraulic lime.

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 Live-Scale Testing of Granular Materials Stabilized with Alkali-Activated Waste Glass and Carbide Lime

2021 ◽  
Vol 11 (23) ◽  
pp. 11286
Author(s):  
Marina Paula Secco ◽  
Débora Thaís Mesavilla ◽  
Márcio Felipe Floss ◽  
Nilo Cesar Consoli ◽  
Tiago Miranda ◽  
...  
Keyword(s):  
Portland Cement ◽  
Mechanical Performance ◽  
Raw Materials ◽  
Sodium Hydroxide Solution ◽  
Fine Sand ◽  
Field Application ◽  
Natural Soil ◽  
In Situ Tests ◽  
Alkali Activated

The increasingly strong search for alternative materials to Portland cement has resulted in the development of alkali-activated cements (AAC) that are very effective at using industrial by-products as raw materials, which also contributes to the volume reduction in landfilled waste. Several studies targeting the development of AAC—based on wastes containing silicon and calcium—for chemical stabilization of soils have demonstrated their excellent performance in terms of durability and mechanical performance. However, most of these studies are confined to a laboratory characterization, ignoring the influence and viability of the in situ construction process and, also important, of the in situ curing conditions. The present work investigated the field application of an AAC based on carbide lime and glass wastes to stabilize fine sand acting as a superficial foundation. The assessment was supported on the unconfined compressive strength (UCS) and initial shear modulus (G0) of the developed material, and the field results were compared with those prepared in the laboratory, up to 120 days curing. In situ tests were also developed on the field layers (with diameters of 450 and 900 mm and thickness of 300 mm) after different curing times. To establish a reference, the mentioned precursors were either activated with a sodium hydroxide solution or hydrated with water (given the reactivity of the lime). The results showed that the AAC-based mixtures developed greater strength and stiffness at a faster rate than the water-based mixtures. Specimens cured under controlled laboratory conditions showed better results than the samples collected in the field. The inclusion of the stabilized layers clearly increased the load-bearing capacity of the natural soil, while the different diameters produced different failure mechanisms, similar to those found in Portland cement stabilization.

scholarly journals Geochemical And Mineralogical Assessment Of Secondary Gypsum In Al-Najaf, Iraq And Employment As Raw Material For Cement Industry

2021 ◽  
Vol 72 ◽  
pp. 215-222
Author(s):  
Mohanad R.A. Al-Owaidi ◽  
◽  
Mohammed L. Hussein ◽  
Ruaa Issa Muslim ◽  
◽  
...  
Keyword(s):  
Portland Cement ◽  
Raw Materials ◽  
Chemical Properties ◽  
Quality Standard ◽  
Cement Industry ◽  
Raw Material ◽  
Insoluble Residue ◽  
Mineralogical Study ◽  
The Mean ◽  
Industry Success

The Portland cement industry is one of the strategic industries in any country. The basis of an industry success is the availability of raw materials and, the low extraction in addition to transportation costs. The Bahr Al-Najaf region is abundant with limestone rocks but lacks primary gypsum. An investigation had been carried out to identify the source of secondary gypsum as an alternative to primary gypsum. Twelve boreholes were drilled for a depth of 2 m, as the thickness of suitable secondary gypsum layer ranges from 1 to 1.5 m. The mineralogical study revealed the predominance of gypsum followed by quartz and calcite, with an average of 62.9%, 19.6% and 14.35%, respectively. The geochemical analysis revealed that the content of SO3 is appropriate and ranging from 41.92% to 32.89% with an average of 37.73%. The SO3 content is within an acceptable range. The mean abundance of the major oxides of the study area may be arranged as SO3 > CaO> SiO2> MgO> Al2O> Fe2O3. The insoluble residue was at an acceptable rate. The laboratory experiments for milling secondary gypsum with clinker has successfully proven the production of Portland cement that matches the limits of the Iraqi Quality Standard (IQS) No. 5 of 1984. Great care must be taken when using secondary gypsum; secondary gypsum must be mixed well to maintain the chemical properties before blending with clinker and utilizing in the cement mill in the cement plant.

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