scholarly journals Porous aggregate development for lightweight concrete

2020 ◽  
Vol 159 ◽  
pp. 06008
Author(s):  
Olga Miryuk
Keyword(s):  
Liquid Glass ◽  
Multicomponent Mixture ◽  
Lightweight Concrete ◽  
Raw Material ◽  
Structural Defects ◽  
Formation Mechanisms ◽  
Glass Cullet ◽  
Porous Concrete ◽  
Molding Mixture ◽  
Ore Dressing

The article presents the results of studies of a porous aggregate and lightweight concrete obtained using liquid glass and man-made materials (glass cullet, magnetite ore dressing waste, substandard rocks). Feasibility of a multicomponent feed mixture for pyroplastic swelling of granules is substantiated. Optimization of raw mix composition provided the possibility of combining various formation mechanisms of porous granules. A set of technological solutions has been developed aimed at improving the conditions of molding and hardening of raw granules. A method for preparing a raw material mass is proposed that minimizes structural defects of porous granules. Possibility of capacity reaction of a raw mixture due to mechanical activation of solid components and introduction of sodium additives is proved. Technological conditions for low-temperature expansion of a multicomponent mixture and production of porous granules with a density of not more than 300 kg/m3 are determined. The formula of molding mixture for obtaining lightweight concrete using a porous aggregate is proposed. The use of liquid glass as a binder in a concrete mixture is preferred. The temperature of concrete hardening is recommended. The technology of porous concrete developed implements multifunctional properties of liquid glass, provides the use of technogenic materials, saving of energy resources.

scholarly journals Porous formation process of granules from man-triggered raw materials

2019 ◽  
Vol 97 ◽  
pp. 02025 ◽  
Author(s):  
Olga Miryuk
Keyword(s):  
Liquid Glass ◽  
Raw Materials ◽  
Glass Cullet ◽  
Equal Distribution ◽  
Molding Mixture ◽  
Porous Formation ◽  
First Time ◽  
Technological Methods ◽  
Highly Porous ◽  
Glass Mixture

The results of studies of porous structure formation in a granular glass mixture are presented. Raw mixes were prepared from glass cullet, waste of magnetite ores dressing and liquid glass. The reason for adding of magnetite ores waste to the glass mixture was the information on chemical and mineral composition, results of studies of thermal transformations of waste. The rationale for adding of 20 – 30% of magnetite ores waste into the raw mix is confirmed by lowering the bloating temperature and increasing granules porosity. The effect of pyrite mineral on structural transformations in a glass mixture has been studied for the first time. It was revealed that the presence of pyrite up to 10% in the glass mixture intensifies swelling at lower temperatures. A method for preparing a molding mixture is proposed, which ensures the formation of highly porous granules with equal distribution of cells in the structure. The method involves mechanical activation of mixture of glass cullet and magnetite ores waste by grinding in a vibratory mill and subsequent portion-wise introduction of the activated mixture into liquid glass. A complex of technological methods allows obtaining porous granules with a packed density of 300 kg/m3 at a temperature of 825°C.

scholarly journals Foam Glass Crystalline Granular Material from a Polymineral Raw Mix

Crystals ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 1447
Author(s):  
Olga Miryuk ◽  
Roman Fediuk ◽  
Mugahed Amran
Keyword(s):  
Liquid Glass ◽  
Lightweight Concrete ◽  
Raw Materials ◽  
Foam Glass ◽  
Raw Material ◽  
Glass Mass ◽  
Thermal Activity ◽  
Material Base ◽  
Resource Saving ◽  
Glass Breakage

The article is devoted to the development of resource-saving technology of porous granular materials for energy-efficient construction. The relevance of the work for international research is to emphasize expanding the raw material base of porous lightweight concrete aggregates at the expense of technogenic and substandard materials. The work aims to study the processes of porization of glass crystalline granules from polymineral raw materials mixtures. The novelty of the work lies in the establishment of regularities of thermal foaming of glass crystalline granules when using waste of magnetic separation of skarn-magnetite (WMS) ores and lignite clay. Studies of liquid glass mixtures with various mineral fillers revealed the possibility of the formation of a porous structure with the participation of opoka, WMS and lignite clay. This is due to the presence in the materials of substances that exhibit thermal activity with the release of a gas phase. The foaming efficiency of the investigated materials increases when combined with glass breakage. The addition of WMS and lignite clay to the glass mixture increases the pore size in comparison with foam glass. The influence of the composition of raw mixtures on the molding and stability of granules is determined. The addition of sodium carbonate helps to strengthen the raw granules and reduce the softening temperature of the mass. The composition of the molding mixture of glass breakage, liquid glass and a multicomponent additive is developed, which provides an improvement in the molding properties of the glass mass, foaming of granules at a temperature of 750 °C. Foam glass crystalline granules have polymodal porosity, characterized by a density of 330–350 kg/m3, a compressive strength of 3.2–3.7 MPa, and a thermal conductivity of 0.057–0.061 W/(m·°C). Accordingly, the developed granules have a high potential use in structural and heat-insulating concretes.

Influence of Fillers on Silicate Compositions Porization

2021 ◽  
Vol 887 ◽  
pp. 521-527
Author(s):  
O.A. Miryuk
Keyword(s):  
Electron Microscopy ◽  
Liquid Glass ◽  
Experimental Studies ◽  
Raw Material ◽  
Material Base ◽  
Technological Properties ◽  
Glass Cullet ◽  
Technical Properties ◽  
Mineral Additives ◽  
Porous Silicate

The article is devoted to the problem of raw material base expanding and improving construction and technical properties of porous granular materials. The results of experimental studies of silicate compositions based on liquid glass and technogenic fillers containing burnable or gas-forming components are presented. Influence of molding mixtures’ composition on thermal expansion nature of granular compositions was established. Preference of a filler combined, containing glass cullet, silica clay and mineral additives was revealed. Multicomponent composition of a filler helps to intensify composition’s expansion. Electron microscopy studies of porous silicate granules have confirmed the advantages of combined fillers using. Effectiveness of sodium additive introduction to regulate technological properties of the raw material and the process of pores formation has been proven. Expediency of mechanical activation of a raw mixture to reduce the temperature of expansion and obtain granules with a bulk density of not more than 300 kg/m3 has been determined.

Entropy of Nanostructures

2017 ◽  
pp. 600-614
Author(s):  
Ottorino Ori ◽  
Franco Cataldo ◽  
Mihai V. Putz
Keyword(s):  
Mechanical Properties ◽  
Free Energy ◽  
Gibbs Free Energy ◽  
Defect Formation ◽  
Vacancy Concentration ◽  
Structural Evolution ◽  
Point Of View ◽  
Structural Defects ◽  
Formation Mechanisms ◽  
Topological Invariants

Recent advances in graphene studies deal with the influence of structural defects on graphene chemical, electrical, magnetic and mechanical properties. Here the complex mechanisms leading to the formation of clusters of vacancies in 2D honeycomb HD lattices are described by a pure topological point of view, aiming to correlate the variation of specific topological invariants, sensible to vacancy concentration, to the structural evolution of the defective networks driven by the topo-thermodynamical Gibbs free energy. Interesting predictions on defect formation mechanisms add details on the topological mechanisms featured by the graphenic structures with defects. Future roles of bondonic particles in defective HD materials are also envisaged.

Aerated Concrete Based on Cullet and Liquid Glass

2019 ◽  
Vol 974 ◽  
pp. 362-366
Author(s):  
Svetlana V. Samchenko ◽  
Olga V. Aleksandrova ◽  
Anna A. Zaitseva
Keyword(s):  
Liquid Glass ◽  
Technology Development ◽  
Industrial Wastes ◽  
Energy Technology ◽  
Glass Cullet ◽  
Technical Glass ◽  
Environmental Technology ◽  
Glass Density ◽  
Aerated Concrete ◽  
The Cost

The possibility of using technical glasswork with liquid glass to produce aerated concrete using low-energy technology was considered in the paper. The unsorted technical glass cullet use as a part of aerated concrete will allow the non-decomposing industrial wastes disposal, which makes it possible to speak about the environmental technology development, while reducing the cost of producing effective heat-insulating materials considers its economic efficiency. The optimum liquid glass density was established upon aerated concrete mix receipt, which should be at least 1.23 and not more than 1.35 g / cm3. The technical characteristics of aerated concrete based on cullet and liquid glass obtained in this work are determined. Thermal conductivity of aerated concrete with its density of 150-400 kg / m3 is 0.06 W/m°C. The resulting aerated concrete is recommended for thermal insulation of pipelines both during construction and during their repair.

scholarly journals Properties of Sulfur Particles Formed in Biodesulfurization of Biogas

Minerals ◽  
2020 ◽  
Vol 10 (5) ◽  
pp. 433
Author(s):  
Annemerel Mol ◽  
Renata van der Weijden ◽  
Johannes Klok ◽  
Cees Buisman
Keyword(s):  
Single Crystals ◽  
Elemental Sulfur ◽  
Raw Material ◽  
Formation Mechanisms ◽  
Small Individual ◽  
Gravitational Settling ◽  
Particle Properties ◽  
Alkaline Conditions ◽  
Individual Particles ◽  
Number Of Particles

In the biodesulfurization (BD) process under halo-alkaline conditions, toxic hydrogen sulfide is oxidized to elemental sulfur by a mixed culture of sulfide oxidizing bacteria to clean biogas. The resulting sulfur is recovered by gravitational settling and can be used as raw material in various industries. However, if the sulfur particles do not settle, it will lead to operational difficulties. In this study, we investigated the properties of sulfur formed in five industrial BD facilities. Sulfur particles from all samples showed large differences in terms of shape, size, and settleability. Both single crystals (often bipyramidal) and aggregates thereof were observed with light and scanning electron microscopy. The small, non-settled particles account for at least 13.6% of the total number of particles and consists of small individual particles with a median of 0.3 µm. This is undesirable, because those particles cannot be removed from the BD facility by gravitational settling and lead to operational interruption. The particles with good settling properties are aggregates (5–20 µm) or large single crystals (20 µm). We provide hypotheses as to how the differences in sulfur particle properties might have occurred. These findings provide a basis for understanding the relation between sulfur particle properties and formation mechanisms.

Reviews on the Properties of Aggregates Made with or without Geopolymerisation Method

2012 ◽  
Vol 626 ◽  
pp. 892-895 ◽  
Author(s):  
Rafiza Abd Razak ◽  
Mohd Mustafa Al Bakri Abdullah ◽  
Kamarudin Hussin ◽  
I. Khairul Nizar ◽  
D. Hardjito ◽  
...  
Keyword(s):  
Fly Ash ◽  
Mechanical Testing ◽  
Lightweight Concrete ◽  
Raw Material ◽  
Lightweight Aggregates ◽  
Ash Aggregates

Aggregates are popular for use in concrete and lightweight concrete applications. Recent research shows that the by-product materials such as fly ash can be used as raw material in producing aggregates and lightweight aggregates. The usage of this material can improve the quality of the aggregates produced compared to conventional in term of structurally strong, physically stable, durable, and environmentally inert. This paper summarized the process and mechanical testing on the fly ash aggregates and lightweight aggregates to be used in concrete.

The Use of Carbonate Sludge in the Production of Porous Aggregate

2020 ◽  
Vol 24 (6) ◽  
pp. 15-19
Author(s):  
A.V. Kolpakov ◽  
E.S. Abdrakhimova
Keyword(s):  
Industrial Waste ◽  
Liquid Glass ◽  
Glass Composition ◽  
Physical And Mechanical Properties ◽  
Ceramic Materials ◽  
Environmental Safety ◽  
Raw Material ◽  
Material Base ◽  
Carbonate Sludge ◽  
The Russian Federation

The possibilities of obtaining porous fillers based on carbonate sludge and liquid-glass composition are considered. One of the issues of industrial waste disposal is the creation of waste-free technologies. The use of nanotechnology-based carbonate sludge in the production of porous aggregates increases environmental safety. A porous aggregate with high physical and mechanical properties was obtained. The use of carbonate sludge in the production of porous aggregate contributes to: a) recycling of industrial waste; b) environmental protection; C) expanding the raw material base for obtaining ceramic materials for construction. A patent of the Russian Federation was obtained for the obtained method of producing a porous aggregate using a liquid-glass composition.

Influencing Factors and New Developments of Fly Ash Based Geopolymer

2013 ◽  
Vol 831 ◽  
pp. 62-66
Author(s):  
Chen Si ◽  
Zhu Ge Yan ◽  
De Ping Xu
Keyword(s):  
Fly Ash ◽  
Lightweight Concrete ◽  
Material Selection ◽  
Cementitious Material ◽  
Raw Material ◽  
New Developments ◽  
Factors Affecting ◽  
High Calcium ◽  
Raw Material Selection ◽  
Geopolymer Composites

This paper presents a discussion of factors affecting the performance of fly ash based geopolymer, and some recent innovations on fly ash based geopolymer. The characteristics of fly ash based geopolymer are discussed in terms of the effects of raw material selection, alkaline activators, and curing procedures. Nowadays, researchers have used geopolymer as a cementitious material to develop innovative geopolymer materials, such as porous, fibre reinforced and foam fly ash based geopolymer concrete, which are greener than the traditional cementitious material. The high-calcium fly ashes could be used to produce porous fly ash based geopolymer composites with satisfactory mechanical properties. The addition of fibres increases greatly the ductility of geopolymer. Foam can be added to the geopolymeric mixture to produce lightweight concrete. However, the manufacturing of fly ash-based geopolymer foam concrete has not been explored too much.

Possibilities of Binding Recycled Glass in Production of Advanced Building Materials

2016 ◽  
Vol 865 ◽  
pp. 255-260
Author(s):  
Martina Reif ◽  
Jiri Zach ◽  
Vítězslav Novák
Keyword(s):  
Thermal Insulation ◽  
Building Materials ◽  
Lightweight Concrete ◽  
Raw Materials ◽  
Lightweight Aggregate ◽  
Waste Glass ◽  
Raw Material ◽  
Acoustic Properties ◽  
Transportation Engineering ◽  
Advanced Composite Materials

The use of secondary raw material resources for construction purposes currently has a great potential. Secondary raw materials obtained by recycling waste glass find use (among others) in the production of thermal and acoustic insulation, production of lightweight concrete mixes and also in transportation engineering e.g. in road reconstruction.The paper deals with the possibilities of binding lightweight aggregate based on waste glass powder and with the production of advanced composite materials with good thermal insulation and acoustic properties. This means cement, epoxy resin and bituminous matrix with the goal to develop advanced building materials that could find further use as, for example, thermal insulation materials.

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