scholarly journals FEATURES OF THE STRUCTURE FORMATION OF MULTICOMPONENT BINDING SYSTEMS OF ALKALINE ACTIVATION

2020 ◽  
pp. 51-58
Author(s):  
С-А. Ю. Муртазаев ◽  
М. Ш. Саламанова ◽  
Д. К-С. Батаев
Keyword(s):  
Portland Cement ◽  
Construction Industry ◽  
Practical Importance ◽  
Cement Stone ◽  
Reinforced Concrete Structures ◽  
Alkaline Activation ◽  
Fine Powders ◽  
Natural Aluminosilicate ◽  
Alkaline Activator ◽  
Theoretical Foundations

Разработка рецептур бесклинкерных вяжущих связок щелочной активации на основе тонкодисперсных порошков природного алюмосиликатного происхождения позволит получать новые эффективные строительные композиты. В работе раскрываются вопросы, связанные с теоретическими основами формирования структуры и прочности цементного камня на основе щелочного активатора. Результаты исследований, на наш взгляд, безусловно представляют практическую значимость для строительной отрасли, так как предлагаемые рецептуры бесклинкерных цементов способны заменить дорогой и энергоемкий портландцемент, позволяя создавать прочные и долговечные бетонные и железобетонные конструкции. The development of formulations of clinker-free binders of alkaline activation based on fine powders of natural aluminosilicate origin will make it possible to obtain new effective building composites. The paper reveals issues related to the theoretical foundations of the formation of the structure and strength of cement stone based on an alkaline activator. The research results, in our opinion, undoubtedly are of practical importance for the construction industry, since the proposed recipes for clinker-free cements can replace expensive and energy-intensive Portland cement, allowing you to create strong and durable concrete and reinforced concrete structures.

RESEARCH OF PROPERTIES OF MULTI-COMPONENT FILLED ALKALINE ACTIVATION KNITTING SYSTEMS

2021 ◽  
Vol 93 (1) ◽  
pp. 114-124
Author(s):  
S-A. YU. MURTAZAEV ◽  
◽  
M. SH. SALAMANOVA ◽  
◽  
Keyword(s):  
Construction Industry ◽  
Building Materials ◽  
Raw Materials ◽  
Practical Importance ◽  
Cement Stone ◽  
Resource Potential ◽  
Alkaline Activation ◽  
Technological Processing ◽  
Alkaline Activator ◽  
Theoretical Foundations

The anthropogenic load on the planet’s natural resource potential is growing rapidly, therefore, special attention is paid to the development of less costly and low energy-intensive technologies for obtaining new building materials, the implementation of which does not require high-temperature and expensive technological processing, and will allow the use of local secondary and substandard raw materials. The development of formulations of clinker-free binders of alkaline activation based on fine powders of natural and technogenic origin will allow to obtain new effective building composites. The paper reveals issues related to the theoretical foundations of the formation of the structure and strength of cement stone based on an alkaline activator. The research results, in our opinion, undoubtedly are of practical importance for the construction industry, since the proposed recipes for clinker-free cements can replace expensive and energy-intensive Portland cement, allowing you to create strong and durable concrete and reinforced concrete structures.

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 REGULARITIES OF THE PROCESSES OF FORMATION OF THE STRUCTURE AND STRENGTH OF A CLINKER-FREE BINDER OF ALKALINE ACTIVATION

2020 ◽  
Vol 3 (1) ◽  
pp. 21-29 ◽  
Author(s):  
M. Nahaev ◽  
M. Salamanova ◽  
Z. Ismailova
Keyword(s):  
Construction Industry ◽  
Electron Probe ◽  
Cement Stone ◽  
Optimal Composition ◽  
Magmatic Origin ◽  
Alkaline Activation ◽  
X Ray ◽  
Fine Powders ◽  
Amorphous Compounds ◽  
Energy Consuming

resource- and energy-consuming Portland cement is currently considered the most popular material in the construction industry, but its production can be attributed to the category of harmful industries in terms of the amount of emissions into the environment. Therefore, the development of a clinker-free technology for the production of binders based on mineral fine powders of aluminosilicate nature activated by an alkaline coater is a relevant and promising direction. In the work, the laws of the processes occurring during the structure formation of clinker-free binder systems of alkaline activation on alkaline cements using blast furnace granulated slags in a finely dispersed state are studied. Formulations are given and the properties of clinker-free binders of alkaline activation on mineral fine powders from rocks of sedimentary and magmatic origin are investigated. Electron probe studies and X-ray phase analysis revealed the presence of hydrated amorphous compounds close in composition to zeolites in cement stone. An analysis of the results allowed us to determine the optimal composition of clinker-free binder alkaline activation “silicified marl + volcanic tuff (70: 30%) + Na2Si03 + Na0H” with activity ranging from 42.0 - 54.5 MPa, depending on the conditions of hardening of the samples.

scholarly journals Industrial experience in the implementation of clinker-free binders of alkaline activation

2021 ◽  
Vol 48 (3) ◽  
pp. 106-116
Author(s):  
M. Sh. Salamanova ◽  
Z. Kh. Ismailova
Keyword(s):  
Portland Cement ◽  
Construction Industry ◽  
Cement Industry ◽  
Cement Clinker ◽  
Cement Stone ◽  
Portland Cement Clinker ◽  
Cement Binder ◽  
Alkaline Activator ◽  
Effective Use ◽  
Calcium Hydrosilicate

Objective. Issues related to the search for new, less energy- and material- intensive binders have long been on the agenda of many world environmental forums, since the carbonate technology of Portland cement entails pollution of the surrounding atmosphere and habitat, and the price of this product is unjustifiably growing. In our opinion, alkaline cements could contribute to the construction industry. Within the framework of this work, research results have been obtained that confirm the effectiveness of the development of a clinker-free technology for producing alkaline-mixed binders and composites based on them using aluminosilicate additives, both natural and technogenic origin.Method. The methods of electron microscopy and differential thermal analysis make it possible to study the nature of the components and the processes of formation of the structure of the cement stone. Waste from the cement industry has the appropriate granulometric and chemical composition, the aluminosilicate mineralogy of the studied powders confirms their compliance with the ready-made raw mix of Portland cement clinker, which is the key to the possibility of their effective use.Result. The carried out differential thermal analyzes confirmed the presence of the following phases in the composition of cement stone on binding bonds "cement dust - alkaline activator" of zeolite, calcite, mica type muscovite, montrillonite, magnesium oxide, calcium sulfoaluminates, ettringite structure, calcium hydrochloraluminate, calcium hydrosilicate, calcium hydrosilicate calcium.Conclusion. The obtained regularities of the processes of formation of the structure of the cement binder "waste of the cement industry - Na2SiO3", will transform these developments to create strong and durable artificial building composites competing with concretes on Portland cement.

scholarly journals DEVELOPMENT OF SPECIAL RECIPES OF BINDING COMPOSITIONS WITH IMPROVED PROPERTIES

2020 ◽  
Vol 3 (4) ◽  
pp. 5-12
Author(s):  
M. Salamanova ◽  
M. Nahaev ◽  
B. Sarsenbaev
Keyword(s):  
Building Materials ◽  
Raw Materials ◽  
Practical Importance ◽  
Metallurgical Industry ◽  
Cement Stone ◽  
Production Wastes ◽  
Technological Processing ◽  
Rotary Kilns ◽  
Artificial Stone ◽  
Theoretical Foundations

the ecological safety of earthly civilization suffers from the accumulation of huge volumes of industrial waste, the natural resource potential is decreasing, therefore, special attention is paid to the development of less costly and low energy-intensive technologies for obtaining new building materials, the implementation of which does not require high-temperature and expensive technological processing, and will allow the use of secondary and substandard raw materials. The work presents the results of the development of special formulations of binder compositions of alkaline activation based on cement production wastes in the form of aspiration and clinker dust from electrostatic precipitators of rotary kilns and waste from the metallurgical industry - ferrosilicon additives in the form of active silica, which will allow obtaining new building materials with improved properties. The paper investigates the properties of an alkaline cement paste and cement stone, reveals issues related to the theoretical foundations of the formation of the structure and strength of an artificial stone based on an alkaline activator. The research results, in our opinion, are certainly of practical importance for the construction industry, as the proposed formulations of clinker-free cements can partially replace expensive and energy-intensive Portland cement, making it possible to create strong and durable concrete and reinforced concrete structures

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 The use of a volcanic material as filler in self-compacting concrete production for lower strength applications

2017 ◽  
Vol 67 (325) ◽  
pp. 111 ◽  
Author(s):  
D. Burgos ◽  
A. Guzmán ◽  
K. M.A. Hossain ◽  
S. Delvasto
Keyword(s):  
Compressive Strength ◽  
Portland Cement ◽  
Cementitious Material ◽  
Total Weight ◽  
Self Compacting Concrete ◽  
Lower Strength ◽  
Volcanic Material ◽  
Fine Powders ◽  
Slump Flow ◽  
Concrete Production

This study evaluates the use of large amounts of fine powders (fillers) derived from a Colombian volcanic material into the production of self-compacting concrete (SCC) for lower strength applications. The effects on SCC properties were studied with the incorporation of up to 50% of volcanic material of Tolima (MVT) as a partial substitute of the total weight of Portland cement. The workability was determined through slump flow, V-funnel, and L-box test. The compressive strength results were analyzed statistically by MINITAB. These demonstrated that 30% (by total weight of cementitious material) was the maximum allowable percentage of MVT to be used in the production of SCCs. Based on this, mechanical and permeability properties of SCC MVT 30% were evaluated at 28, 90 y 360 curing days. SCC MVT 30% exhibited compressive strength of 21 and 27 MPa after 28 and 360 days of curing, respectively.

scholarly journals The Potentials of Iron and Steel Slags as Supplementary Cementitious Materials in the Nigerian Construction Industry: A Review

2018 ◽  
Vol 2 (2) ◽  
pp. 208-218
Author(s):  
O. R. Ogirigbo ◽  
J. O. Ukpata ◽  
I. Inerhunwa
Keyword(s):  
Portland Cement ◽  
Construction Industry ◽  
Waste Product ◽  
Steel Production ◽  
Cementitious Materials ◽  
Supplementary Cementitious Materials ◽  
Partial Replacement ◽  
Iron And Steel ◽  
Tropical Environments ◽  
Iron And Steel Production

Ground Granulated Blast Furnace Slag (GGBS) is a type of Supplementary Cementitious Material (SCM) that is currently being used extensively in the global construction industry. SCMs are cheaper than Portland cement, help to improve certain properties of concrete and also help to reduce the environmental footprint associated with the production of Portland cement. GGBS is readily available in most parts of the world as a waste product from iron and steel production. However, its use as a SCM in some countries has not been fully maximized. This is primarily because of lack of documented studies on the properties of GGBS that influences its suitability as a SCM, especially in tropical environments. This paper reviewed the use of GGBS as a SCM for the partial replacement of Portland cement, with particular emphasis on its potential use in tropical warm environments such as Nigeria and other similar countries.

Alkali-Activated EAF Reducing Slag as Binder for Concrete

2013 ◽  
Vol 723 ◽  
pp. 580-587
Author(s):  
Wen Huan Zhong ◽  
Tung Hsuan Lu ◽  
Wei Hsing Huang
Keyword(s):  
Portland Cement ◽  
Drying Shrinkage ◽  
Portland Cement Concrete ◽  
Steel Making ◽  
Chemical Content ◽  
Alkaline Activator ◽  
Furnace Slag ◽  
Alkali Activated ◽  
Better Than

Electric arc furnace (EAF) reducing slag is the by-product of EAF steel-making. Currently, reducing slag is considered a waste material by the industry in Taiwan. Since the chemical content of reducing slag is similar to blast furnace slag (BFS), it is expected that reducing slag exhibits a similar pozzolanic effect as the BFS. This study used alkaline activator consisting of sodium silicate and sodium hydroxide to improve the activity of reductive slag so as to replace Portland cement as binder in concrete. Some BFS was used to blend with the reducing slag to enhance the binding quality of alkali-activated mixes. The results show that a blend of 50% BFS and 50% reducing slag can be activated successively with alkali. Also, the sulfate resistance of concrete made with alkali-activated EAF reducing slag is found to be better than that of concrete made with portland cement, while the drying shrinkage of alkali-activated EAF reducing slag concrete is greater than that of portland cement concrete.

scholarly journals Analysis of the Crack Resistance of the Cement Stone and Roche

2019 ◽  
Vol 50 (2) ◽  
pp. 124-131
Author(s):  
Vladimir Erofeev ◽  
Irina Maksimova ◽  
Nikolay Makridin ◽  
Alexey Bulgakov ◽  
Salman Al-Dulaimi
Keyword(s):  
Crack Resistance ◽  
Influencing Factor ◽  
Limit State ◽  
Practical Importance ◽  
Cement Composite ◽  
Material Structure ◽  
Cement Stone ◽  
Professional Literature ◽  
Actual Strength ◽  
New Generation

The crack resistance is the most important parameter of strength. It characterizes the ability of a material structure to resist the beginning of the movement and development of cracks at mechanical and other force impacts and is the most important parameter of the limit state of the structure. In this regard, the evaluation of parameters of the mechanics of rocks, used as fillers (dispersed phase) and the cement stone (matrix phase) for concrete, influencing factor of the actual strength of the cement composite, is not only of theoretical interest, but also of great practical importance, since the issues in regards to the problem of choosing fillers are very poorly addressed in the professional literature, especially re the new generation of concretes.

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