Processing Methods Used to Create High-Quality Porous Structure of Aerated Concrete

2020 ◽  
Vol 992 ◽  
pp. 212-217
Author(s):  
L.A. Suleymanova ◽  
A.S. Kolomatsky ◽  
M.V. Marushko
Keyword(s):  
Porous Structure ◽  
Structure Formation ◽  
Volume Ratio ◽  
Effect Of Temperature ◽  
Thermal Vacuum ◽  
High Quality ◽  
Molding Sand ◽  
Processing Methods ◽  
Concrete Production ◽  
Aerated Concrete

The efficiency of porous structure formation in aerated concrete can be improved by including the methods of thermal vacuum compaction or thermal vacuum compaction with vibration into the process as a means of creating high-quality composite cellular concrete. A graphic model of a phase composition change in the aerated concrete mix was developed allowing for an evaluation of the recipe and the mode of bubble porosity generation during hardening. This provides a control over the manufacturing processes and helps to produce aerated concrete with the specified porosity balance, which defines product properties.The effect of temperature and vacuum on molding sand during the initial stage of manufacture is proportional to the bubble porosity volume, which is important for a high-quality porous structure formation. In addition to the above, account must be taken of the combined effect of temperature, vacuum and volume ratio of phases in the base mix when using the proposed methods.Introduction of the developed processing methods into the manufacturing process improves the technology of aerated concrete production and allows for a fabrication of the finest advanced heat insulating and structural and heat insulating products.

Porous Structure And High Electrical Resistivity Of AIPdRe Icosahedral Phase

1998 ◽  
Vol 553 ◽  
Author(s):  
K. Kirihara ◽  
K. Kimura
Keyword(s):  
Electrical Resistivity ◽  
Porous Structure ◽  
Structure Formation ◽  
Kirkendall Effect ◽  
Icosahedral Phase ◽  
Complete Understanding ◽  
High Quality ◽  
Porosity Formation ◽  
High Electrical Resistivity

AbstractMechanism of the structure formation of the I-phases, which is required for complete understanding of the origin of their high electrical resistivity and preparation of the high quality samples, is proposed. During annealing within 30 minutes, atomic difiusion of Al and Pd atoms from Al3Pd phase to Al07Re0.3 phase occurs and porosity is formed in the Al3Pd phase. It is supposed that the porosity formation results from Kirkendall effect.

Porous Structure Formation of Aerated Concrete with Variational Properties

2019 ◽  
Vol 945 ◽  
pp. 233-237
Author(s):  
P.P. Deryabin ◽  
I.L. Chulkova ◽  
M.A. Raschupkina ◽  
Yu.S. Danilina
Keyword(s):  
Porous Structure ◽  
Structure Formation ◽  
Cross Section ◽  
Closed Surface ◽  
Variable Density ◽  
Factors Affecting ◽  
Gas Generators ◽  
Aerated Concrete ◽  
Main Factors ◽  
The Cross

The main drawbacks of aerated concrete preparation traditional technology are considered. The method essence for the porous structure formation of aerated concrete products with variational properties is formulated. The main factors affecting aerated concrete products properties of varying density and strength along the cross-section are indicated. The mold cover closed surface with a circular opening area effect on aerated concrete products main properties is shown and its optimum value is revealed. The traditional and modern types gas generators influence on gas evolution kinetics, mixture swelling height, gas generators stability in time and variable density and strength on the cross-section aerated concrete products main properties are considered.

Influence of mechanically treated carbon fibre additives on structure formation and properties of autoclaved aerated concrete

2012 ◽  
Vol 26 (1) ◽  
pp. 362-371 ◽  
Author(s):  
Antanas Laukaitis ◽  
Jadvyga Kerienė ◽  
Modestas Kligys ◽  
Donatas Mikulskis ◽  
Lina Lekūnaitė
Keyword(s):  
Carbon Fibre ◽  
Structure Formation ◽  
Autoclaved Aerated Concrete ◽  
Aerated Concrete ◽  
Treated Carbon

Study of the Water-Glass Role in the Foam Glass Synthesis Using Glycerol Foaming Agent

2021 ◽  
Vol 316 ◽  
pp. 153-158
Author(s):  
Boris M. Goltsman ◽  
Lyubov A. Yatsenko ◽  
Natalia S. Goltsman
Keyword(s):  
Porous Structure ◽  
Structure Formation ◽  
Water Glass ◽  
Glass Batch ◽  
Foam Glass ◽  
Foaming Agent ◽  
Additive Type ◽  
Highly Porous ◽  
Material Porosity

The article discusses the peculiarities of the "water-glass – glycerol" foaming mixture components interaction during foam glass synthesis. The important role of the foaming additive type in the foam glass porous structure formation was described, the main foaming substances were listed. The obtaining and researching technology of the samples was described, the compositions of the initial batches using the "water-glass – glycerol" mixture were developed. It was shown that a material with a highly porous structure and density below 500 kg/m3 can be obtained only with the combined introduction of water-glass and glycerol. In this case, mixtures with a predominance of water-glass in the foaming mixture possess optimal properties. Using DSC, it was shown that the addition of water-glass to the mixture completely eliminates the evaporation of glycerol at lower temperatures and intensifies its combustion at higher temperatures. Thus, the addition of water-glass to the glycerol-based foam glass batch allows glycerol to be saved up to higher temperatures that increases the resulting material porosity.

scholarly journals Modeling of Carbon Materials Porous Structure Formation

2018 ◽  
Author(s):  
R. Lisovskyi ◽  
I. Poplavskyi ◽  
B. Rachii ◽  
Z. Lyubun
Keyword(s):  
Porous Structure ◽  
Structure Formation ◽  
Carbon Materials

Interaction of Ultrafine Titanium Oxide Particles with Layered Vanadium Oxide Hydrate

1998 ◽  
Vol 520 ◽  
Author(s):  
S. Kittaka ◽  
K. Matsuno ◽  
S. Takahara
Keyword(s):  
Titanium Dioxide ◽  
Vanadium Oxide ◽  
Porous Structure ◽  
Structure Formation ◽  
Titanium Oxide ◽  
Vanadium Pentoxide ◽  
Layered Structure ◽  
Oxide Hydrate ◽  
Toxic Gases ◽  
Oxide Particles

ABSTRACTVanadium pentoxide hydrate was pillared with ultrafine titanium dioxide particles to form expanded layered structure (∼20 A) and thereby forming microporous substance (diameter =∼10 A). Porous structure formation and adsorption of some toxic gases (CO and NO) were discussed.

scholarly journals In situ monitoring of hydrothermal reactions by X-ray diffraction with Bragg–Brentano geometry

2020 ◽  
Vol 53 (4) ◽  
pp. 1163-1166
Author(s):  
Karsten Mesecke ◽  
Winfried Malorny ◽  
Laurence N. Warr
Keyword(s):  
Quantitative Information ◽  
In Situ Monitoring ◽  
X Ray Diffraction ◽  
Hydrothermal Conditions ◽  
X Ray ◽  
Saturated Vapour Pressure ◽  
Concrete Production ◽  
Aerated Concrete ◽  
Kinetics Of

This note describes an autoclave chamber developed and constructed by Anton Paar and its application for in situ experiments under hydrothermal conditions. Reactions of crystalline phases can be studied by successive in situ measurements on a conventional laboratory X-ray diffractometer with Bragg–Brentano geometry at temperatures <483 K and saturated vapour pressure <2 MPa. Variations in the intensity of X-ray diffraction reflections of both reactants and products provide quantitative information for studying the reaction kinetics of both dissolution and crystal growth. Feasibility is demonstrated by studying a cementitious mixture used for autoclaved aerated concrete production. During a period of 5.7 h at 466 K and 1.35 MPa, the crystallization of torbermorite and the partial consumption of quartz were monitored.

Different Processing Methods to Obtain Porous Structure in Shape Memory Polymers

2007 ◽  
pp. 663-668
Author(s):  
Silvia Farè ◽  
Luigi De Nardo ◽  
S. De Cicco ◽  
M. Jovenitti ◽  
Maria Cristina Tanzi
Keyword(s):  
Porous Structure ◽  
Shape Memory ◽  
Shape Memory Polymers ◽  
Processing Methods
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