scholarly journals Definition Of Puzzolanic Properties Active Mineral Additives In Portlandcement

2021 ◽  
Vol 03 (03) ◽  
pp. 7-12
Author(s):  
Gulsanam Ruzimurodovna Tursunova ◽  
◽  
Farrukh Bakhtiyarovich Atabaev ◽  
Keyword(s):  
Portland Cement ◽  
Cement Stone ◽  
Industry Waste ◽  
Natural Production ◽  
Production And Consumption ◽  
Mineral Additive ◽  
Definition Of ◽  
Mineral Additives ◽  
Mineralizing Additive ◽  
Active Mineral Additives

The article presents the results of testing the use of Angren dry remote active ash and slag in Portland cement as an active mineral additive. It was found that Portland cement with the addition of Angren dry remote active ash and slag renders karrazastoy, ekanomet clinker and it is proved that hydro removed ash and slag (2011 year) does not recommend as an active mineral additive. Therefore, dry remote active ash and slag is recommended for use as an active mineral additive in the production of cement, improving its construction and technical properties. The possibility of using Angren dry remote active ash and slag as an active mineral component for producing cements with low corrosion resistance is shown. Angren dry remote active ash and slag contributes to the formation of the structure of the cement stone, increases its density and strength against aggressive ions, causing increased resistance in aggressive environments. And save up to 30% of cement. It has been established that Portland cement with the addition of Angren dry remote active ash and slag has an intensifying effect on the formation of clinker minerals. Therefore, the Angren dry remote active ash and slag is recommended for use as a mineralizing additive in the production of cement. Use of chemical industry waste with replacement of expensive natural production and consumption waste. At the same time, an environmental problem is being addressed.

scholarly journals The clays after heat treatment as the concrete active mineral additive

2018 ◽  
Vol 170 ◽  
pp. 03021
Author(s):  
Olga Bazhenova ◽  
Sofia Bazhenova ◽  
V. Nemirova ◽  
Dmitriy Bazhenov
Keyword(s):  
Heat Treatment ◽  
Portland Cement ◽  
Raw Material ◽  
Cement Stone ◽  
Material Resources ◽  
Mineral Additive ◽  
Granulated Slag ◽  
Technical Properties ◽  
Mineral Additives ◽  
Active Mineral Additives

Active mineral additives are one of the most common components of cement systems now. They are entered cements of increase in extent of hydration, the directed formation of structure of a cement stone from more stable hydrate phases of the lowered basicity, for the purpose of improvement of construction and technical properties of cements, by cutting of costs of fuel raw material resources for their production, giving to cements of some specific properties. In work the possibility of use as active mineral additives not only the granulated slags, but also local clays which industrially can give certain puzzolan properties are considered. It is proved that heat treatment of clay breeds significantly increases their puzzolan activity that does them suitable for use as active mineral additive instead of the domain granulated slag by production of the portland cement.

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 FEATURES OF THE SELECTION OF THE RATIONAL STRUCTURE OF THE COMPOSITIONAL GIPS BINDER

2020 ◽  
pp. 45-52 ◽  
Author(s):  
N. Chernysheva ◽  
S. Shatalova ◽  
A. Evsyukova ◽  
Hans-Bertram Fisher
Keyword(s):  
Water System ◽  
Internal Stresses ◽  
Mineral Additive ◽  
The Russian Federation ◽  
Reasonable Choice ◽  
The Stability ◽  
Mineral Additives ◽  
Selection Of ◽  
Hardening System ◽  
Active Mineral Additives

the dynamically developing construction in the Russian Federation makes it necessary to expand the range of alternative types of binders and materials based on them. Such a binder is a previously developed composite gypsum binder (CGB), used for the production of materials of various functional purposes. The manufacture and use of CGB-based composites was made possible by studying the Portland cement-gypsum-water system, the stability of which is ensured by introducing an appropriate amount of active mineral additives that reduce the concentration of Ca(OH) 2 in the liquid phase of the hardening system and create the possibility of hardening under certain conditions without dangerous internal stresses. In this paper, we consider the possibility of using composite gypsum binder for fine-milled quartzitic sandstone crushing dropout and concrete scrap crushing dropout as an active mineral additive. Rational compositions of composite gypsum binder are developed and their basic properties are studied. The reasonable choice of the amount of active mineral additive allows optimizing the properties of the composite gypsum binder.

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%.

scholarly journals EFFECTIVE CELLULAR CONCRETE ON THE COMPOSITE GYPSUM BINDER

2019 ◽  
Vol 4 (10) ◽  
pp. 11-18
Author(s):  
С. Шаталова ◽  
S. Shatalova ◽  
Н. Чернышева ◽  
N. Chernysheva ◽  
Е. Глаголев ◽  
...  
Keyword(s):  
Water System ◽  
Mineral Additive ◽  
The Russian Federation ◽  
The Stability ◽  
Mineral Additives ◽  
Stepwise Loading ◽  
Hardening System ◽  
Cellular Concrete ◽  
Active Mineral Additives ◽  
Structure Properties

The dynamically developing construction of the Russian Federation makes it necessary to expand the range of alternative types of binders and materials based on them. Such binders include a composite gypsum binder used for the production of materials for various functional purposes. The manufacture and use of products based on composite gypsum binders is made possible by studying the Portland cement – gypsum – water system, the stability of which is ensured by introducing of an appropriate amount of active mineral additives. Such additives reduce the concentration of Са (ОН) 2 in the liquid phase of the hardening system and create the possibility of hardening under certain conditions without dangerous internal tensions. This article discusses the obtaining of effective cellular concrete on a composite gypsum binder. Cellular concrete surpasses some traditional materials in its structure, properties, methods of preparation, and they are universal in terms of operational properties. The possibility and expediency of using thin-ground concrete scrap as a mineral additive in the composition of composite gypsum binder for cellular concrete is established in the work. Thermal insulation and structural cellular concrete of D600 and D700 grades are obtained. It is revealed that the stepwise loading of the components of the concrete mixture with the initial introduction of a gypsum binder is rational.

scholarly journals Estimation of Hydration Degree of Blended Cements with the Help of k-Values

Materials ◽  
2019 ◽  
Vol 12 (15) ◽  
pp. 2420 ◽  
Author(s):  
Reiterman ◽  
Holčapek ◽  
Davidová ◽  
Jaskulski ◽  
Keppert
Keyword(s):  
Portland Cement ◽  
Ceramic Powder ◽  
Numerical Estimation ◽  
Time Intervals ◽  
Blended Cements ◽  
Degree Of Hydration ◽  
Mineral Additives ◽  
Furnace Slag ◽  
Active Mineral Additives

The growing utilization of various mineral additives in the building industry has caused concern worldwide to reduce the emissions of carbon dioxide from Portland cement (OPC) production. The present paper is focused on the determination of the degree of hydration of blended binding systems based on Portland cement. Blast furnace slag, fly ash, and ceramic powder are used in the study; they are applied by 12.5 wt.% up to 50% of OPC replacement. The evolution of the hydration process is monitored using thermogravimetry in selected time intervals to determine the degree of hydration; its ultimate value is obtained from numerical estimation using the Michaelis-Menten equation. However, due to the application of active mineral additives, the correction in terms of equivalent binder is conducted. Corrected values of the degree of hydration exhibit good fit with compressive strength.

scholarly journals MODERN TECHNOLOGIES OF MATERIALS FOR PROTECTION THE WORKING SURFACES OF HYDROCLONE AGAINST WEAR

2019 ◽  
Vol 4 (7) ◽  
pp. 135-139
Author(s):  
Ю.М. Фадин ◽  
Yuriy Fadin ◽  
П. Хахалев ◽  
Pavel Hahalev ◽  
Е. Трапезникова ◽  
...  
Keyword(s):  
Portland Cement ◽  
Cement Clinker ◽  
Cement Production ◽  
Wet Process ◽  
Working Surface ◽  
Hydraulic Binder ◽  
Calcium Silicates ◽  
Mineral Additives ◽  
Modern Technologies ◽  
Active Mineral Additives

The article considers the process of portland cement production by wet process. Portland cement is a hydraulic binder that is produced by cement clinker, gypsum and additives. Calcium silicates are commonly used as additives. Portland cement production consists of following processes: crushing of clinker and gypsum stone; preparation of mineral additives (crushing, drying); grinding of clinker with active mineral additives and gypsum; storage, packaging and shipping the cement to consumer. Since grinding is carried out in a closed cycle, it is necessary to select the classifying equipment. For this purpose, an analysis is made, which reveals that the hydrocyclone is the most multi-purpose and less expensive in operation of classifying equipment. The study of the hydrocyclone design demonstrates a significant drawback in the form of increased wear of the hydrocyclone working surfaces, which has an impact on durability and work efficiency. The degree of wear the hydrocyclone surfaces depends on the nature of the pulp impact and the mechanical characteristics of material of the hydrocyclone working surface. This article is devoted to the study of the most popular and frequently used wear-resistant materials to protect work surfaces from wear.

scholarly journals INFLUENCE OF FINE-DISPERSED ADDITIVE FROM CONCRETE SCRAP ON STRUCTURE FORMATION OF PORTLANDCEMENT

2021 ◽  
Vol 6 (1) ◽  
pp. 20-28
Author(s):  
A. Ahmed ◽  
R. Lesovik ◽  
W. Al'-Bo-Ali ◽  
G. Lesovik
Keyword(s):  
Mechanical Properties ◽  
Portland Cement ◽  
Structure Formation ◽  
Physical And Mechanical Properties ◽  
High Dispersion ◽  
Optimal Density ◽  
Building Products ◽  
X Ray ◽  
Mineral Additive ◽  
Mineral Additives

The object of the study is the effect of the introduction of a mineral additive (Ssp = 900 m2/kg) of the fraction (0.315–5 m) of the screening out of crushing concrete scrap into Portland cement for the production of various building products and structures. A fraction of concrete scrap of 0.315–5 mm is used in the work, since the X-ray phase analysis of various fractions of concrete scrap shows that these fractions have a rational content of non-hydrated particles of C3S and C2S. It is proved that the use of finely ground concrete scrap (Ssp = 900 m2/kg) as a mineral additive in Portland cement increaseINFLUENCE OF FINE-DISPERSED ADDITIVE FROM CONCRETE SCRAP ON STRUCTURE FORMATION OF PORTLANDCEMENT s the physical and mechanical properties of concrete. Comparative physical and mechanical indicators of the hardening of composite binders indicate that the most stable results with a uniform increase in strength is a composition with 5 % mineral additive, with an increase in strength from 2 to 7 days by 36 % and from 7 to 28 days by 46 %. It is found that the most rational are the compositions with 5 % and 10 % mineral additives providing an increase in the strength of the samples by 16% compared to the control composition. Due to the high dispersion, the mineral additive from concrete scrap acts as additional crystallization centers during the hydration of Portland cement, which leads to the creation of a skeleton coral-like structure, which additionally overgrows with submicroscopic crystals. With a specific surface area of 900 m2/kg, the best conditions are created for the formation of the primary frame and its further overgrowth with various crystalline calcium hydrates, which provide optimal density and strength.

scholarly journals COMPOSITE BINDING MINERAL ADDITIVE INFLUENCE ON THE PLASTICIZER EFFICIENCY

2020 ◽  
pp. 10-16 ◽  
Author(s):  
M. Elistratkin ◽  
S. Minakov ◽  
S. Shatalova
Keyword(s):  
Portland Cement ◽  
Water Requirement ◽  
Strength Characteristics ◽  
Rheological Characteristics ◽  
Effective Implementation ◽  
Genetic Types ◽  
Mineral Additive ◽  
Additive Influence ◽  
Mineral Additives ◽  
Practical Task

replacing portland cement with composite binders in many construction spheres is becoming increasingly reasonable. A prerequisite for this is the ability to provide the binder with set of properties necessary for the most effective implementation of a particular practical task at minimum expense. Such optimization allows in some cases to achieve higher performance than the original cement, in others – to form new properties of the material, as well as provide direct or indirect savings of various resources. One of the most important parameters determining the strength characteristics of composites and their durability is the used binder water requirement. Furthermore in some cases the mixture must have certain rheological characteristics. Various types and generations plasticizing and water reducing additives are widely used to regulate these parameters. The article discusses relation of fine components electrosurface properties – the clinker component and various genetic types mineral additives for the main types of plasticizers magnitude diluting effect. The basic mechanisms and regularities are described, recommendations that allow to optimize the consumption of expensive additives or increasing their effectiveness in solving various practical problems are formulated.

“BALLADS IN PROSE”: GENRE CROSSING IN LATE-VICTORIAN WOMEN'S WRITING

2006 ◽  
Vol 34 (2) ◽  
pp. 619-629 ◽  
Author(s):  
Margaret D. Stetz
Keyword(s):  
Visual Arts ◽  
Oscar Wilde ◽  
Double Standard ◽  
Same Sex ◽  
Independent Contribution ◽  
New Women ◽  
Fictional Narratives ◽  
Production And Consumption ◽  
Definition Of ◽  
Periodical Publishing

“Oh, it is indeed a burning shame that there would be one law for men and another law for women. I think that there should be no law for anybody” (Beckson, I Can Resist 100). So said Oscar Wilde to a journalist interviewing him in January 1895. And for the first five years of the 1890s, it looked as though the British literary and publishing worlds, at least, were increasingly in accord with this Wildean perspective. Texts challenging the double standard of heterosexual conduct proliferated, even as bold articulations of same-sex desire appeared. At the same time, laws of all sorts that governed the production and consumption of literature seemed to be struck down daily. The three-volume novel declined and, with it, the circulating libraries' law of conforming to Mudie's definition of the reading public's tastes. New Women and other new realists gleefully violated the laws that required fictional narratives to end with marriage or, indeed, to provide some version of closure. In the sphere of periodical publishing, the law demanding that the visual arts be subordinate to words vanished in April 1894 with the first issue of the Yellow Book. The Bodley Head's new quarterly proudly stated that “The pictures will in no case serve as illustrations to the letter-press, but each will stand by itself as an independent contribution” (Stetz and Lasner 8).

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