scholarly journals New Manufacturing Method of Glass Foam by Cold Expansion of Glass Waste

2021 ◽  
Vol 2 (3) ◽  
pp. 1-9
Author(s):  
Lucian Paunescu ◽  
Sorin Mircea Axinte ◽  
Bogdan Valentin Paunescu
Keyword(s):  
Thermal Conductivity ◽  
Aqueous Solution ◽  
Compressive Strength ◽  
High Temperature ◽  
Insulation Material ◽  
Glass Waste ◽  
Foaming Agents ◽  
Manufacturing Method ◽  
Aluminium Powder ◽  
Glass Foam

Abstract                                                         An innovation cold manufacturing method of glass foams is presented in the paper. Traditional foaming agents used in conventional expansion processes of glass waste at high temperature were substituted with aluminium powder in aqueous solution of calcium hydroxide, which releases hydrogen forming gas bubbles in the viscous sludge and then, by solidification, a porous structure typical for the glass foam. The manufactured foam is adequate for using as a thermal insulation material for inner wall of buildings, having the apparent density of 0.31 g·cm-3, the thermal conductivity of 0.070 W/m·K and the compressive strength of 1.32 MPa. The process originality is the use of recycled aluminum waste, melted by an own microwave heating technique and sprayed with nitrogen jets. The process effectiveness is remarkable in economical and energy terms.

scholarly journals Adequate Correlation between the Physical and Mechanical Properties of Glass Foam

2021 ◽  
Vol 1 (4) ◽  
pp. 14-26
Author(s):  
Lucian Paunescu ◽  
Sorin Mircea Axinte ◽  
Marius Florin Dragoescu ◽  
Felicia Cosmulescu
Keyword(s):  
Mechanical Properties ◽  
Thermal Conductivity ◽  
Compressive Strength ◽  
Thermal Properties ◽  
Thermal Insulation ◽  
Coal Fly Ash ◽  
Physical And Mechanical Properties ◽  
Ceramic Foam ◽  
Glass Waste ◽  
Glass Foam

The paper presents experimental results obtained in the manufacturing process of a glass foam by adequate correlation between its physical and thermal properties (density, porosity, thermal conductivity) and mechanical (compressive strength) by a slight controlled overheating of the foamed material. Using a powder mixture of glass waste (87-91.5 %), coal fly ash (3-9 %) and silicon carbide (4-5.5 %) microwave heated at 935-975 ºC by this unconventional technique, constituting the originality of the work, was obtained a glass-ceramic foam with moderate compressive strength (1.8-2.6 MPa) and very low thermal conductivity (0.058-0.070 W/m·K). The material overheating generated a homogeneous porous structure characterized by closed cells with relatively large dimensions (without the tendency to join neighboring cells) making it difficult to transfer heat across the material. The foamed product is suitable for the manufacture of thermal insulation blocks for the inner or outer walls of the building without excessive mechanical stress, being an advantageous alternative by comparison with known types of polymeric or fiberglass thermal insulation materials.

DENSE GLASS FOAM PRODUCED IN MICROWAVE FIELD

2018 ◽  
Vol 24 (1) ◽  
pp. 30-35
Author(s):  
LUCIAN PAUNESCU ◽  
MARIUS FLORIN DRAGOESCU ◽  
SORIN MIRCEA AXINTE ◽  
BOGDAN VALENTIN PAUNESCU
Keyword(s):  
Thermal Conductivity ◽  
Compressive Strength ◽  
Building Materials ◽  
Microwave Field ◽  
Microwave Energy ◽  
Glass Waste ◽  
Foaming Agent ◽  
Mechanical Feature ◽  
Glass Foam ◽  
Fluxing Agent

Experimental results obtained in the process of manufacturing dense glass foam using the microwave energy are presented in the work. The glass foam is produced from bottle glass waste, calcium carbonate as foaming agent and borax as fluxing agent. The high compressive strength (2.5 - 6.2 MPa) is the main mechanical feature of this product, which together with other physical and morphological features (apparent density 0.60 – 0.90 g/cm3, porosity 59.1 – 72.7%, thermal conductivity 0.081 – 0.105 W m K, water absorption 0.5 – 1.0%, pore size 0.5 – 3 mm), are appropriate for using as a substitute for similar building materials existing on the market.

scholarly journals Adequate Correlation between the Physical and Mechanical Properties of Glass Foam

2021 ◽  
Vol 2 (4) ◽  
pp. 14-26
Author(s):  
Lucian Paunescu ◽  
Sorin Mircea Axinte ◽  
Marius Florin Dragoescu ◽  
Felicia Cosmulescu
Keyword(s):  
Mechanical Properties ◽  
Thermal Conductivity ◽  
Compressive Strength ◽  
Thermal Properties ◽  
Thermal Insulation ◽  
Coal Fly Ash ◽  
Physical And Mechanical Properties ◽  
Ceramic Foam ◽  
Glass Waste ◽  
Glass Foam

The paper presents experimental results obtained in the manufacturing process of a glass foam by adequate correlation between its physical and thermal properties (density, porosity, thermal conductivity) and mechanical (compressive strength) by a slight controlled overheating of the foamed material. Using a powder mixture of glass waste (87-91.5 %), coal fly ash (3-9 %) and silicon carbide (4-5.5 %) microwave heated at 935-975 ºC by this unconventional technique, constituting the originality of the work, was obtained a glass-ceramic foam with moderate compressive strength (1.8-2.6 MPa) and very low thermal conductivity (0.058-0.070 W/m·K). The material overheating generated a homogeneous porous structure characterized by closed cells with relatively large dimensions (without the tendency to join neighboring cells) making it difficult to transfer heat across the material. The foamed product is suitable for the manufacture of thermal insulation blocks for the inner or outer walls of the building without excessive mechanical stress, being an advantageous alternative by comparison with known types of polymeric or fiberglass thermal insulation materials.

scholarly journals DENSE GLASS FOAM PRODUCED IN MICROWAVE FIELD

2018 ◽  
Vol 24 (1) ◽  
Author(s):  
LUCIAN PAUNESCU ◽  
MARIUS FLORIN DRAGOESCU ◽  
SORIN MIRCEA AXINTE ◽  
BOGDAN VALENTIN PAUNESCU
Keyword(s):  
Thermal Conductivity ◽  
Compressive Strength ◽  
Building Materials ◽  
Microwave Field ◽  
Microwave Energy ◽  
Glass Waste ◽  
Foaming Agent ◽  
Mechanical Feature ◽  
Glass Foam ◽  
Fluxing Agent

<p>Experimental results obtained in the process of manufacturing dense glass foam using the microwave energy are presented in the work. The glass foam is produced from bottle glass waste, calcium carbonate as foaming agent and borax as fluxing agent. The high compressive strength (2.5 - 6.2 MPa) is the main mechanical feature of this product, which together with other physical and morphological features (apparent density 0.60 – 0.90 g/cm<sup>3</sup>, porosity 59.1 – 72.7%, thermal conductivity 0.081 – 0.105 W m K, water absorption 0.5 – 1.0%, pore size 0.5 – 3 mm), are appropriate for using as a substitute for similar building materials existing on the market.</p>

scholarly journals Optimization of Polyurethane Lightweight Aggregate with the Addition of Palm-Based Polyol

2015 ◽  
Vol 773-774 ◽  
pp. 1017-1021
Author(s):  
Kamarul Aini Mohd Sari ◽  
Abdul Rahim M. Sani ◽  
Sohif Mat ◽  
Khairiah Hj. Badri
Keyword(s):  
Thermal Conductivity ◽  
Compressive Strength ◽  
Reaction Time ◽  
Palm Kernel ◽  
Lightweight Aggregate ◽  
Insulation Material ◽  
Concrete Technology ◽  
Kernel Oil ◽  
Methylene Diphenyl Diisocyanate ◽  
Time Density

Lightweight aggregate for concrete was produced by utilizing palm-based polyurethane (PU) as a substantial material. New types of green PU were prepared by reacting palm kernel oil polyol (PKO-p) with 2, 4-methylene diphenyl diisocyanate (crude MDI). Six attempts on rigid PU were investigated to determine the reaction time, density, compressive strength, and thermal conductivity. An additional polyol showed high density between 200-300 kg/m3. The compressive strength and thermal conductivity improved to 11.5 MPa and 0.060 W/mK, respectively. As a conclusion, the results of palm-based PU showed excellent properties established the lightweight aggregate and insulation material in the concrete technology.

Development Strategy of Insulation Macromolecular Composite Materials

2011 ◽  
Vol 391-392 ◽  
pp. 328-331
Author(s):  
Yong Peng Yu
Keyword(s):  
Thermal Conductivity ◽  
High Temperature ◽  
Development Strategy ◽  
Cooling System ◽  
High Thermal Conductivity ◽  
Nano Particles ◽  
Insulation Material ◽  
Foreign Companies ◽  
The Status ◽  
Insulation Systems

The status and progress of high pressure resistant insulation material at home and abroad were reviewed from aspects like high thermal conductivity, high temperature resistance, environ-mental protection and modification of nano-particles. High thermal conductivity insulation materials can improve the efficiency of cooling system and decrease the energy loss of electric machines. Some famous foreign companies keep ahead in this field. Current domestic high temperature resistant solvent less insulating varnish can only be used in small and medium sized generators instead of high voltage generators. Therefore this kind of material should be improved in either resin rich or resin less insulation systems.

The Development and Application of Non-Shrinking Composite Silicate Insulation Material

2013 ◽  
Vol 772 ◽  
pp. 178-181
Author(s):  
Yong Liang Zhan ◽  
Hai Yang Chen ◽  
Xing Hua Hou ◽  
Fei He
Keyword(s):  
Thermal Conductivity ◽  
High Temperature ◽  
Production Process ◽  
Thermal Insulation ◽  
Raw Materials ◽  
Drying Shrinkage ◽  
Structural Member ◽  
Insulation Material ◽  
Technical Performance

Non-shrinking composite silicate insulation material has advantages of low drying shrinkage, density, thermal conductivity and good thermal insulation which withstands high temperature and militates in favor of specially shaped structural member construction, etc. This article describes raw materials and the production process of the above material, discusses thermal insulation characteristics, technical performance and the features of use and particularizes the application effect in the project.

A Study on Chemical Foaming Geopolymer Building Materials

2013 ◽  
Vol 853 ◽  
pp. 202-206 ◽  
Author(s):  
Tsung Yin Yang ◽  
Chuan Chi Chien
Keyword(s):  
Thermal Conductivity ◽  
Compressive Strength ◽  
Sound Absorption ◽  
Building Materials ◽  
Reaction Rate ◽  
Hydrogen Gas ◽  
Aluminum Powders ◽  
Foaming Agents ◽  
Low Thermal Conductivity ◽  
Base Solution

Zinc and aluminum powders were used as foaming agents and organosilane was innovatively used as a modifier to synthesize a foamed geopolymer. The produced foamed geopolymer with enhanced compressive strength and low thermal conductivity is an ideal material for fire protection, sound absorption and thermal insulation. The low thermal conductivity was achieved by increasing the porosity in the foamed geopolymer and the enhanced compressive strength was realized by adding the modifier. The pore numbers in the foamed geopolymer were greatly increased by releasing the hydrogen gas, which was produced from the chemical reaction of zinc and aluminum powders in a base solution. The modifier decreased the foaming reaction rate and generated homogeneously-distributed small pores in the foamed geopolymer with improved compressive strength.

Production of Thermal Insulation Composite Material Based on Polymers

2012 ◽  
Vol 535-537 ◽  
pp. 239-242
Author(s):  
Alena Kalužová ◽  
Jan Pěnčík ◽  
Libor Matějka ◽  
Libor Matějka ◽  
Tomáš Pospíšil ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Compressive Strength ◽  
Composite Material ◽  
Thermal Insulation ◽  
Raw Materials ◽  
Sustainable Construction ◽  
Glass Waste ◽  
Particle Composite ◽  
Coefficient Of Thermal Conductivity ◽  
Uniform Dispersion

Recycling of materials is an important point of sustainable construction. The aim is to find a compromise between energy saving, economy and ecology. The contribution discusses the production of thermal insulation composite material made of polymers. Uniform dispersion of grains of foamy glass waste (filler) in polymer filling from recycled thermoplastics induces formation of particle composite. The production supports usage of secondary raw materials. Decisive properties in choosing the materials to be applied include mainly the coefficient of thermal conductivity, density, compressive strength and water absorption.

scholarly journals MICROWAVE MANUFACTURE OF GLASS FOAM BY COMBINED USE OF GRAPHITE AND CALCIUM CARBONATE AS FOAMING AGENTS

2021 ◽  
Vol 27 (1) ◽  
pp. 110-119
Author(s):  
LUCIAN PAUNESCU ◽  
SORIN MIRCEA AXINTE ◽  
MARIUS FLORIN DRAGOESCU ◽  
BOGDAN VALENTIN PAUNESCU ◽  
FELICIA COSMULESCU
Keyword(s):  
Calcium Carbonate ◽  
High Strength ◽  
Industrial Processes ◽  
Glass Waste ◽  
Foaming Agents ◽  
Combined Use ◽  
Variable Weight ◽  
Low Energy Consumption ◽  
Experimental Variant ◽  
Glass Foam

The paper presents experimental results obtained in the manufacturing process of high-strength glass foam by combined use of two solid foaming agents (calcium carbonate and graphite) in variable weight ratios. The originality of the work is applying the unconventional microwave heating method, unlike the conventional techniques currently used in similar industrial processes. The optimal experimental variant, composed of 89.1 % glass waste, 0.9% calcium carbonate, 1 % graphite and other additives, was sintered at 828 ºC with a very low energy consumption (0.73 kWh/kg). The main characteristics of the optimal product were apparent density of 0.39 g/cm3, thermal conductivity of 0.088 W/m·K and compressive strength of 3.6 MPa, being usable in fields that requires resistance to mechanical stress and relatively difficult environmental conditions.

Sign in / Sign up

Export Citation Format

Share Document