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 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).

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.

Porosity Evaluation of Alternative Materials Based on Portland Cement

2014 ◽  
Vol 1000 ◽  
pp. 314-317 ◽  
Author(s):  
Ladislav Pařízek ◽  
Eva Bartoníčková ◽  
Vlastimil Bílek Jr. ◽  
Jiří Kratochvíl
Keyword(s):  
Fly Ash ◽  
Portland Cement ◽  
Coal Combustion ◽  
Mercury Intrusion Porosimetry ◽  
Raw Materials ◽  
High Energy ◽  
Energy Requirements ◽  
Mercury Intrusion ◽  
Secondary Raw Materials ◽  
Alternative Materials

High energy requirements and the resulting economic demands due to the production of Portland cement leads to tendency to replace a portion of cement with secondary raw materials or to use other alternative binders. Among the commonly used cements replacements is currently fly ash which is produced during the coal combustion. In this paper the influence of cement/ash ratio in a paste on paste’s porosity is investigated using mercury intrusion porosimetry.

Production of Partition Blocks from Synthetic Gypsum

2013 ◽  
Vol 860-863 ◽  
pp. 1338-1341 ◽  
Author(s):  
Marcela Fridrichová
Keyword(s):  
Tensile Strength ◽  
Raw Materials ◽  
Basic Unit ◽  
High Quality ◽  
Laboratory Environment ◽  
Secondary Raw Materials ◽  
Partition Walls ◽  
Complex Building

The task is solved in connection with Ministry of Industry and Trade project which is involved in development of a complex building programme based on high quality gypsum binder from secondary raw materials. Within one of sub-stages a solution of production of small plaster elements is subject of the project which should present a basic unit for construction of interior plaster partition walls. In the framework of the task a cast of plaster shaped block was carried out using a pilot form of own production. A plaster produced in optimised pilot way from the synthetic gypsum modified with plasticizer and retarding additive was used as a filler binder. After demoulding the produced block was exposed in laboratory environment and tested for setting of selected required properties according to standard EN 12859 (dimensions, density, flatness, tensile strength on bend, pH).

scholarly journals ADDITIVES TO BITUMENS

2019 ◽  
Vol 45 (3) ◽  
pp. 175-184
Author(s):  
N. A. Belova ◽  
L. P. Korotovenko ◽  
N. A. Strakhova
Keyword(s):  
Asphalt Concrete ◽  
Raw Materials ◽  
Physicomechanical Properties ◽  
Resin Acids ◽  
Main Task ◽  
Modified Bitumen ◽  
High Quality ◽  
Adhesion Properties ◽  
Term Operation ◽  
Adverse Weather

Objectives. Improving the quality of road bitumen is currently particularly relevant, since allows you to extend the life of road asphalt coatings with the ever-increasing fleet of cars. The main task of research was to study the effect of used oils on the process of structure formation of oxidized bitumen.Method. The introduction of additives of different nature, i.e. its modification, both itself and raw materials, is one of the main ways to improve the physicomechanical properties of bitumens. Introduction to bitumen of small additives containing carboxyl groups, hydroxy acids and resin acids allows one to control not only the adhesion properties of bitumens, but also to ensure the stability of the asphalt concrete mixture at high temperatures. As components of a polyfunctional modifier, to improve the physicochemical and physicomechanical properties of bitumen and their asphalt concrete, the following distilled talovoe oil TU 13-00281074-26-95, petaerythritol GOST 9286-76 and ethylene-vinyl acetate copolymer are proposed. -97.Result. A technology has been developed to draw used oils into tars in order to obtain high-quality road bitumen grades BND 60/90 and to investigate the qualitative characteristics of bitumen raw materials, used synthetic and mineral oils and bitumen. Waste oils with deter-gent - dispersant additive CPD (colloidal dispersion of calcium carbonate in oil M-14 stabilized with calcium sulfonate, used in the preparation of motor fuels) can be used in the composition of the residual raw materials of refining processes as an activating additive.Conclusion. Improvement of the physicomechanical properties of high-quality bitumen is possible by complex modification with various additives, which allows creating conditions for the long-term operation of pavements under the influence of modern traffic loads and adverse weather conditions. In order to obtain modified bitumen of improved quality, selection of modifying additives and the technology for their preparation are required.

Silicate Sprayed Mixture Based on Secondary Raw Materials

2019 ◽  
Vol 808 ◽  
pp. 129-135
Author(s):  
Petr Figala ◽  
Rostislav Drochytka ◽  
Radek Hermann ◽  
Jiří Kolísko
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
High Temperature ◽  
Fly Ash ◽  
Raw Materials ◽  
Positive Influence ◽  
Foundry Sand ◽  
Secondary Raw Materials ◽  
Fundamental Research

This paper studies the fundamental research and development of sprayed cement-based mixture designed to withstand the chemically aggressive conditions. The aim of this paper is to verify the possibilities of usage of suitable secondary raw materials as a substitution of a binder and filler of the original mixture while preserving or improving the physical-mechanical properties. In this part of the research was studied the possibility to substitute the binder in rate of 20-60 wt.% by high temperature fly ash and the whole filler by foundry sand and slag. Test samples were made from nine recipes, in which was monitored the influence of secondary raw materials on the compressive strength and the water absorption after 28 days of curing. The results of this paper show, it is possible to successfully substitute part of the binder by high temperature fly ash and the filler wholly by foundry sand in the sprayed mixture. These optimized recipes showed positive influence mainly in the long-term on mechanical properties.

scholarly journals STRUCTURE AND PROPERTIES OF CONNECTING ALKALINE ACTIVATION USING CEMENT DUST

2019 ◽  
Vol 46 (2) ◽  
pp. 148-157
Author(s):  
S. A. Aliev ◽  
R. S.-A. Murtazayevа ◽  
M. Sh. Salamanova
Keyword(s):  
Portland Cement ◽  
Raw Materials ◽  
Physicomechanical Properties ◽  
Cement Industry ◽  
Cement Clinker ◽  
Liquid Sodium ◽  
Electrostatic Precipitators ◽  
Rotary Kilns ◽  
Technogenic Raw Materials ◽  
Technological Methods

Objectives In the process of firing Portland cement clinker in electrostatic precipitators, in rotary kilns, a large amount of harmful substances, both clinker and aspiration, accumulates, therefore rational use of these products leads to certain shares of a full-fledged river resource, which are derived from industrial cement. It should be noted that the reuse of dust electrostatic precipitators is impossible.Method The basis for obtaining durable and more resource-efficient composites is based on modern technological methods that contribute to the improvement of technical and physicomechanical properties, with the integrated application of technogenic raw materials and liquid sodium binder.Result The basis for obtaining durable and more resource-efficient composites is based on modern technological methods that contribute to the improvement of technical and physicomechanical properties, with the integrated application of technogenic raw materials and liquid sodium binder.Conclusion The developed clinker-free binder formulations using the cement industry wastes and sodium-based sludge glass will make it possible to produce less expensive, durable, and durable composites that will partially replace traditional concrete with expensive portland cement. 

USE OF SECONDARY RAW MATERIALS OF TEXTILE MATERIALS IN PRODUCTION OF NEW MODELS OF CLOTHES

2020 ◽  
Author(s):  
E.V. Pshenichnikova ◽  
◽  
A.E. Ulanova ◽  
Keyword(s):  
Life Cycle ◽  
Raw Materials ◽  
Household Waste ◽  
Model Design ◽  
High Quality ◽  
Textile Materials ◽  
Secondary Raw Materials ◽  
New Models ◽  
Textured Materials

In article the question of a problem of processing of household waste which in our life became today especially sharp is brought up. Still absolutely new things become not necessary as quickly get out of fashion. Before consumers there is a task how to prolong life cycle of textile materials of high quality. The approach allowing to develop conditions of production of garments with a possibility of use differently of textured materials in one model design is represented.

The Effect of Zinc on the Portland Cement Hydration

2018 ◽  
Vol 761 ◽  
pp. 131-134 ◽  
Author(s):  
Pavel Šiler ◽  
Iva Kolářová ◽  
Jiří Másilko ◽  
Radoslav Novotný ◽  
Tomáš Opravil
Keyword(s):  
Mechanical Properties ◽  
Portland Cement ◽  
Rotary Kiln ◽  
Cement Hydration ◽  
Raw Materials ◽  
Cement Industry ◽  
Secondary Products ◽  
Secondary Raw Materials ◽  
Main Component ◽  
Portland Cement Hydration

Concrete is still the most commonly used building material. The main component of concrete is Portland cement. Due to increasing use of secondary products containing zinc, the amount of zinc in the clinker or in the secondary raw materials is increasing in recent years. Portland clinker can gain zinc from solid waste or tires which are widely used as a fuel for a burning in rotary kiln. In the case of secondary raw materials, zinc may be present in the primary material, where the manufacturing process leads to its removal and concentrating to "waste" which is used in the cement industry. The biggest problem with cement doped with zinc is the retardation of hydration and decreasing of mechanical properties. The main aim of this work is describing and evaluation of zinc effect on the course of Portland cement hydration.

Sign in / Sign up

Export Citation Format

Share Document