scholarly journals Thermal and Acoustic Insulating Gypsum Composite Material with Improved Water Resistance

2020 ◽  
Vol 14 (2) ◽  
pp. 89-93
Author(s):  
Volodimir Kersh ◽  
Andriy Kolesnikov ◽  
Mikola Hlitsov ◽  
Sergіi Gedulyan
Keyword(s):  
Composite Material ◽  
Thermal Insulation ◽  
High Resistance ◽  
Water Resistance ◽  
Resistance Index ◽  
Sound Insulation ◽  
Material Strength ◽  
Building Heat ◽  
Softening Coefficient

The article discusses methods for obtaining building heat and sound insulating composite material based on gypsum with high resistance to water. An additional characteristic is considered - the water resistance index, in which the role of material strength in the wet state is enhanced. The proposed characteristic is used to optimize the heat and sound insulating composition based on gypsum. The material contains matrix gypsum-cement-ash binder and a mixture of aggregates. The result of the planned experiment shows that the water resistance index more adequately reflects the strength of the composite in the wet state compared to the softening coefficient. An optimization of the complex properties of the composite is given in accordance with its intended purpose. As a result of the study, an optimal waterproof composition with improved thermal insulation and sound insulation characteristics was obtained.

Influences of Emulsion on Water Resistance of Vitrified Micro Bubbles Thermal Insulation Material

2013 ◽  
Vol 662 ◽  
pp. 433-436
Author(s):  
Jiang Zhu ◽  
Guo Zhong Li
Keyword(s):  
Compressive Strength ◽  
Polyvinyl Alcohol ◽  
Stearic Acid ◽  
Thermal Insulation ◽  
Water Resistance ◽  
Insulation Material ◽  
Molding Process ◽  
Thermal Insulation Material ◽  
Improve Water Resistance ◽  
Softening Coefficient

Vitrified micro bubbles thermal insulation material was made of vitrified micro bubbles, cement, fly ash, gypsum and sodium silicate, by molding process. VAE emulsion and stearic acid-polyvinyl alcohol emulsion were added to improve water resistance of the material. Mixed with 10% VAE emulsion and 5% stearic acid-polyvinyl alcohol emulsion, properties of the material are followed as: flexural strength 0.64MPa, compressive strength 1.35MPa, softening coefficient 0.71 and 2h volumetric water absorption 6.9%.

scholarly journals An Approach to Determine Optimal Bow Configuration of Polar Ships under Combined Ice and Calm-Water Conditions

2021 ◽  
Vol 9 (6) ◽  
pp. 680
Author(s):  
Hui Li ◽  
Yan Feng ◽  
Muk Chen Ong ◽  
Xin Zhao ◽  
Li Zhou
Keyword(s):  
Numerical Simulation ◽  
Water Resistance ◽  
Numerical Technique ◽  
Experimental Studies ◽  
Resistance Index ◽  
Simulation Method ◽  
Present Approach ◽  
Calm Water ◽  
Level Ice ◽  
Ice Resistance

Selecting an optimal bow configuration is critical to the preliminary design of polar ships. This paper proposes an approach to determine the optimal bow of polar ships based on present numerical simulation and available published experimental studies. Unlike conventional methods, the present approach integrates both ice resistance and calm-water resistance with the navigating time. A numerical simulation method of an icebreaking vessel going straight ahead in level ice is developed using SPH (smoothed particle hydrodynamics) numerical technique of LS-DYNA. The present numerical results for the ice resistance in level ice are in satisfactory agreement with the available published experimental data. The bow configurations with superior icebreaking capability are obtained by analyzing the sensitivities due to the buttock angle γ, the frame angle β and the waterline angle α. The calm-water resistance is calculated using FVM (finite volume method). Finally, an overall resistance index devised from the ship resistance in ice/water weighted by their corresponding weighted navigation time is proposed. The present approach can be used for evaluating the integrated resistance performance of the polar ships operating in both a water route and ice route.

A3.13 The high resistance index values are decreased in systemic lupus erythematosus patients – risk factors and clinical association

2014 ◽  
Vol 73 (Suppl 1) ◽  
pp. A46.2-A47
Author(s):  
Katarzyna Fischer ◽  
Anna Walecka ◽  
Marcin Sawicki ◽  
Lidia Ostanek ◽  
Iwona Brzosko ◽  
...  
Keyword(s):  
Risk Factors ◽  
Systemic Lupus Erythematosus ◽  
High Resistance ◽  
Lupus Erythematosus ◽  
Resistance Index ◽  
Systemic Lupus

Biodegradable Acoustic Proficiency in Sound Absorption Capacity After Water Treatment and Testing by Impendence Tube Method

2021 ◽  
pp. 75-90
Author(s):  
Tushar Kanta Mohapatra ◽  
Suchismita Satapathy ◽  
Isham Panigrahi ◽  
Debesh Mishra
Keyword(s):  
Composite Material ◽  
Sound Absorption ◽  
Research Work ◽  
Absorption Capacity ◽  
Sound Insulation ◽  
Biodegradable Materials ◽  
Acoustic Absorption ◽  
Fiber Reinforced Composite ◽  
New Class ◽  
Reinforced Composite

The present research investigation aims to fabricate a new class of fiber reinforced composite material by using biodegradable materials with epoxy as the strengthening agent. In order to explore the possibilities of using the new class of composite material in required application areas, the research work is carried out mainly in the field of the acoustic absorption properties of these bio fibers as an alternate building material. Also, the utilization of these materials as sound insulation will also provide a good solution to the waste management.

scholarly journals The Effect of Transcrystallinity on the Interface of Green Flax/Polypropylene Composite Materials

2001 ◽  
Vol 10 (5) ◽  
pp. 096369350101000 ◽  
Author(s):  
N. E. Zafeiropoulos ◽  
C. A. Baillie ◽  
F. L. Matthews
Keyword(s):  
Composite Material ◽  
Composite Materials ◽  
Interfacial Strength ◽  
Anisotropic Layer ◽  
Polypropylene Composite ◽  
Flax Fibres ◽  
Fragmentation Test ◽  
Thermoplastic Matrix ◽  
Mode Of Failure

In recent years there has been an increasing interest in using natural fibres as potential reinforcements for polymers. The introduction of fibres such as flax in a semicrystalline thermoplastic matrix such as iPP (isotactic polypropylene) has been shown to lead to the development of transcrystallinity. The presence of an anisotropic layer such as transcrystallinity in the composite material may in turn have a profound effect on the mechanical behaviour of the interface. In this study the role of transcrystallinity has been investigated in green flax (that is flax as received direct from the crops)/iPP by means of the fragmentation test. The results are discussed in terms of previously reported results for treated flax fibres (dew retted)/iPP. Transcrystallinity leads to a stronger interface in green flax/iPP, and its thickness affects the interfacial strength, with thinner transcrystalline layers giving a stronger interface. An examination of the mode of failure at the interface after the fragmentation test also supports the conclusion that the transcrystalline interface is stronger than the spherulitic interface in green flax/iPP composites.

scholarly journals Cool Roof Impact on Building Energy Need: The Role of Thermal Insulation with Varying Climate Conditions

Energies ◽  
2019 ◽  
Vol 12 (17) ◽  
pp. 3354 ◽  
Author(s):  
Piselli ◽  
Pisello ◽  
Saffari ◽  
Gracia ◽  
Cotana ◽  
...  
Keyword(s):  
Thermal Insulation ◽  
Thermal Energy ◽  
Building Energy ◽  
Energy Performance ◽  
Cold Climate ◽  
Climate Conditions ◽  
Building Energy Performance ◽  
Cool Roof ◽  
Solar Reflectance

Cool roof effectiveness in improving building thermal-energy performance is affected by different variables. In particular, roof insulation level and climate conditions are key parameters influencing cool roofs benefits and whole building energy performance. This work aims at assessing the role of cool roof in the optimum roof configuration, i.e., combination of solar reflectance capability and thermal insulation level, in terms of building energy performance in different climate conditions worldwide. To this aim, coupled dynamic thermal-energy simulation and optimization analysis is carried out. In detail, multi-dimensional optimization of combined building roof thermal insulation and solar reflectance is developed to minimize building annual energy consumption for heating–cooling. Results highlight how a high reflectance roof minimizes annual energy need for a small standard office building in the majority of considered climates. Moreover, building energy performance is more sensitive to roof solar reflectance than thermal insulation level, except for the coldest conditions. Therefore, for the selected building, the optimum roof typology presents high solar reflectance capability (0.8) and no/low insulation level (0.00–0.03 m), except for extremely hot or cold climate zones. Accordingly, this research shows how the classic approach of super-insulated buildings should be reframed for the office case toward truly environmentally friendly buildings.

A New Fiber Reinforced Composite Material Properties and Engineering Application

2011 ◽  
Vol 399-401 ◽  
pp. 1294-1297
Author(s):  
Li Xin Yin ◽  
Jing Yan ◽  
Guo Wen Li ◽  
Wei Qiang Xu
Keyword(s):  
Composite Material ◽  
Thermal Insulation ◽  
Low Cost ◽  
Engineering Application ◽  
Outer Wall ◽  
Reinforced Composite ◽  
High Durability ◽  
New Material ◽  
Construction Efficiency ◽  
Reinforced Composite Material

External thermal insulation technology for building external wall has gradually been one important technology of the construction energy conservation. A new fibre reinforced composite material is made up of cement, flyash, silicon ash, the inflation polystyrene pellet and the admixture, after the experiment examination and the engineering application, the effect of thermal insulation is good, the performance of fire proof is excellent, high durability and low cost, good property of sound absorption. Solved the quality problem exist in the traditional building outer wall thermal insulation system such as the thermal insulation layer fall off, split, seep and so on. The new material can product standardize in factory, increase the construction efficiency; in favor of the construction industrialization and could promote construction business sustainable development.

Study on Properties of Foam Concrete Based on Fractal Theory

2011 ◽  
Vol 194-196 ◽  
pp. 1916-1919 ◽  
Author(s):  
Wen Ling Tian ◽  
Jiang Bo Yang ◽  
Xiao Yan Zhao
Keyword(s):  
Fractal Dimension ◽  
Fly Ash ◽  
Thermal Insulation ◽  
Fractal Theory ◽  
High Strength ◽  
Sound Insulation ◽  
Foam Concrete ◽  
Insulation Property ◽  
Foaming Agent ◽  
Thermal Insulation Property

Foam concrete is provided with light weight, thermal insulation, sound insulation and fire resistance, good seismic performance and other characteristics. To improve properties of foam concrete microstructure is studied with the help of fractal theory, fractal dimension related to mechanical properties and thermal performance of foam concrete is calculated by MATLAB language program. The results indicate that the microstructure of foam concrete showed significant fractal character, the fractal dimension is between 1.3 and 2.0. Apparent density, 28d compressive strength, and thermal conductivity decreases with the increase of fly ash and foaming agent content, fractal dimension increased. Formulas of fractal dimension and the fly ash, foaming agent content were established. Foam concrete with low density, high strength, and good thermal insulation property will be prepared conducted by the formulas.

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