Effect of Viscosity Modifying Agent on the Performance of Hybrid Bio-Based Concrete

2022 ◽  
Author(s):  
Mohammed Sonebi ◽  
P. Thiele ◽  
A. Abdalqader ◽  
Leonid I. Dvorkin ◽  
Nataliya Lushnikova ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Experimental Investigation ◽  
Composite Materials ◽  
Water Absorption ◽  
Hybrid Composite ◽  
Mechanical Performance ◽  
Capillary Absorption ◽  
Modifying Agent ◽  
Coefficient Of Thermal Conductivity ◽  
Hybrid Composite Material

An experimental investigation was conducted in order to study the water absorption, mechanical performance, thermal properties and durability of hybrid hemp-rapeseed composite materials. The hybrid composite material is made with 50% hemp shives and 50% rapeseed fibres. The purpose of this study is to investigate the influence of the incorporation of viscosity modifying agent (VMA) on hybrid concrete. Four mixes were made for: shuttered walls and roof insulation with and without VMA. The water absorption of the hybrid composite fibres was, first, measured. The compressive strengths of these mixes at 7 and 28 d were then determined in order to compare the mechanical behaviour of the hybrid composite materials made with VMA. In addition, the capillary absorption and coefficient of thermal conductivity were also measured. The results revealed that VMA improved the performance of the hybrid concrete.

scholarly journals Thermal Properties Characterization of Glass Fiber Hybrid Polymer Composite Materials

2018 ◽  
Vol 7 (3.34) ◽  
pp. 455 ◽  
Author(s):  
Gurushanth B Vaggar ◽  
S C Kamate ◽  
Pramod V Badyankal
Keyword(s):  
Thermal Conductivity ◽  
Composite Material ◽  
Composite Materials ◽  
Hybrid Composite ◽  
Gravimetric Analysis ◽  
Thermal Gravimetric ◽  
Hybrid Polymer ◽  
Hybrid Composite Material ◽  
Hybrid Polymer Composite

In the current work characterization of thermal properties are find out to the prepared specimens of silicon filler hybrid composite materials (silicon filler glass – fiber chop strand). The specimens were prepared by hand layup followed by compression molding machine by non-heating molding technique. Thermal conductivity (K), Coefficient thermal expansion (CTE) and Thermal gravimetric analysis (TGA) are found by composite slab method and by thermal muffler oven in a laboratory. The guard heater is used to supply heat which is measured by voltmeter and ammeter. Thermocouples are placed between the interface of the copper plates and the specimen of silicon filled hybrid polymer composite material (HPC), to read the temperatures. By the experimental readings it is found that the K of silicon filler hybrid composite material directly proportional to the % of silicon fillers for the different trails. The CTE inversely varies with % of silicon fillers and in thermal gravimetric analysis the failure of material takes place at 300°C for a time of 20 minutes and also reduction in mass of silicon inserted hybrid composite material. From the results it has been concluded that the considerable enhance in thermal conductivity with negligible decrease in CTE and increase in thermal resistivity of hybrid composite materials.  

Experimental investigation of hemp fiber hybrid composite material for automotive application

2020 ◽  
Author(s):  
N. Murugu Nachippan ◽  
Mathew Alphonse ◽  
V.K Bupesh Raja ◽  
Soma Shasidhar ◽  
G. Varun Teja ◽  
...  
Keyword(s):  
Experimental Investigation ◽  
Composite Material ◽  
Hybrid Composite ◽  
Automotive Application ◽  
Hemp Fiber ◽  
Hybrid Composite Material

scholarly journals A magnetocaloric composite based on molecular coolers and carbon nanotubes with enhanced thermal conductivity

2017 ◽  
Vol 4 (3) ◽  
pp. 464-476 ◽  
Author(s):  
O. Roubeau ◽  
E. Natividad ◽  
M. Evangelisti ◽  
G. Lorusso ◽  
E. Palacios
Keyword(s):  
Thermal Conductivity ◽  
Carbon Nanotubes ◽  
Composite Material ◽  
Hybrid Composite ◽  
Hybrid Composite Material ◽  
Improved Performance ◽  
Enhanced Thermal Conductivity

Improved performance of molecular cryogenic coolers is achieved through a hybrid composite material with increased thermal conductivity.

Limestone Sludge in the Brick Body

2014 ◽  
Vol 1000 ◽  
pp. 158-161 ◽  
Author(s):  
Radomír Sokolař ◽  
Lucie Vodová ◽  
Mikuláš Šveda
Keyword(s):  
Thermal Conductivity ◽  
Water Absorption ◽  
Bulk Density ◽  
Quartz Sand ◽  
Modulus Of Rupture ◽  
Firing Process ◽  
Brick Clay ◽  
Coefficient Of Thermal Conductivity ◽  
Washing Process ◽  
Firing Shrinkage

Influence of limestone sludge (generated during the washing process of limestone crushed aggregates) with high content of CaO in the form of calcite on the properties of brick body made from non-calcareous sludge (from the washing process of quartz sand) as a basic plastic brick clay was determined. Presence of calcite very distinctly influenced the firing process and properties of fired body. Limestone sludge decreases firing shrinkage, bulk density and coefficient of thermal conductivity of the brick body after the firing in the range of 850 – 950 °C. Higher modulus of rupture and water absorption is typical for fired bodies with limestone sludge addition. Most of these improvement are caused by the formation of anorthite only in the bodies based on the limestone sludge.

scholarly journals Evaluation of the Performance of Bio-Based Rigid Polyurethane Foam with High Amounts of Sunflower Press Cake Particles

Materials ◽  
2021 ◽  
Vol 14 (19) ◽  
pp. 5475
Author(s):  
Agnė Kairytė ◽  
Sylwia Członka ◽  
Renata Boris ◽  
Sigitas Vėjelis
Keyword(s):  
Thermal Conductivity ◽  
Tensile Strength ◽  
Compressive Strength ◽  
Water Absorption ◽  
Polyurethane Foam ◽  
Mechanical Performance ◽  
Positive Impact ◽  
Press Cake ◽  
Rigid Polyurethane Foam ◽  
Average Cell

In the current study, rigid polyurethane foam (PUR) was modified with 10–30 wt.% sunflower press cake (SFP) filler, and its effect on performance characteristics—i.e., rheology, characteristic foaming times, apparent density, thermal conductivity, compressive strength parallel and perpendicular to the foaming directions, tensile strength, and short-term water absorption by partial immersion—was evaluated. Microstructural and statistical analyses were implemented as well. During the study, it was determined that 10–20 wt.% SFP filler showed the greatest positive impact. For instance, the thermal conductivity value improved by 9% and 17%, respectively, while mechanical performance, i.e., compressive strength, increased by 11% and 28% in the perpendicular direction and by 43% and 67% in the parallel direction. Moreover, tensile strength showed 49% and 61% increments, respectively, at 10 wt.% and 20 wt.% SFP filler. Most importantly, SFP filler-modified PUR foams were characterised by two times lower water absorption values and improved microstructures with a reduced average cell size and increased content in closed cells.

scholarly journals Basalt-polyester hybrid composite materials for demanding wear applications

2020 ◽  
Vol 52 (1) ◽  
pp. 67-76 ◽  
Author(s):  
Faisal Abusahmin ◽  
Ahmed Algellai ◽  
Natasa Tomic ◽  
Marija Vuksanovic ◽  
Jelena Majstorovic ◽  
...  
Keyword(s):  
Composite Material ◽  
Composite Materials ◽  
Natural Environment ◽  
Hybrid Composite ◽  
Protective Layer ◽  
Cavitation Resistance ◽  
Environment Friendly ◽  
Ceramic Particles ◽  
Hybrid Composite Material ◽  
The Matrix

Basalt as a filler in a polymer-based composite material fulfils the demand of being natural, environment-friendly material for the production of various composite materials. The material could be used as protective layer and the abrasion should be tested in order to evaluate the properties of the material. The cavitation test enables the evaluation of the possible service in conditions that simulate the extensive erosion. The presence of basalt in the matrix improves the resistance to cavitation. The possibility to further improve the material could be obtained using the reinforcement of the matrix itself by incorporation of submicron ceramic particles into the composite. The obtained hybrid composite material with the addition of reinforcement in the matrix further improves the cavitation resistance.

Effect of EVA Emulsion on the Properties of Corn Stalk Magnesium Oxychloride Cement Composites

2017 ◽  
Vol 863 ◽  
pp. 71-77
Author(s):  
Si Qi Li ◽  
Ying Liang Tian ◽  
Chang Wei Xu ◽  
Jian Heng Wang ◽  
Shi Bing Sun ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Thermal Conductivity ◽  
Water Absorption ◽  
Water Resistance ◽  
Cement Composites ◽  
Corn Stalk ◽  
Coefficient Of Thermal Conductivity ◽  
Magnesium Oxychloride ◽  
Magnesium Oxychloride Cement ◽  
Oxychloride Cement

By the method of EVA emulsion coating, cron stalk-magnesium oxychloride cement composites (C-MOC) was modified to study the effect of EVA emulsion content on C-MOC density, the coefficient of thermal conductivity, water resistance and mechanical properties. Furthermore microstructure of C-MOC was analyzed by SEM. The results show that: with the increase of EVA emulsion content, the coefficient of thermal conductivity and softening of C-MOC increase, but water absorption reduces. When the content is 80%, the flexural strength after 28 days could reach 3.65 MPa and the compressive strength is 4.69 MPa, reaching the maximum. At the same time, C-MOC density is 816 kg/m3 and thermal conductivity is 0.111 W/(m·k). Water absorption is 36% and softening coefficient was 0.47. It is believed that EVA emulsion could form a thin film on the outer surface of the corn stalk by microscopic analysis, increasing the roughness of the straw surface and reducing the gap between the stalk. Since the EVA emulsion has good compatibility with the magnesium oxychloride cement, they could constitute a whole jointly with glue liquid, crystal and fiber, playing the role of enhancing the surface. Therefore, water resistance, thermal conductivity and mechanical properties of C-MOC have been improved effectively.

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