scholarly journals Investigation of thermal properties of raw materials of asphalt mixtures

2017 ◽  
Vol 175 ◽  
pp. 012047
Author(s):  
R Géber ◽  
A Simon ◽  
I Kocserha
Keyword(s):  
Thermal Properties ◽  
Raw Materials ◽  
Asphalt Mixtures

Mechanical and Thermal Properties of Magnesia Binder Based on Natural and Technogenic Raw Materials

2021 ◽  
Vol 320 ◽  
pp. 181-185
Author(s):  
Elvija Namsone ◽  
Genadijs Sahmenko ◽  
Irina Shvetsova ◽  
Aleksandrs Korjakins
Keyword(s):  
Thermal Conductivity ◽  
Thermal Properties ◽  
Raw Materials ◽  
High Strength ◽  
Strength Properties ◽  
Waste Materials ◽  
Mechanical And Thermal Properties ◽  
Experimental Part ◽  
Technogenic Raw Materials ◽  
Caustic Magnesia

Because of low calcination temperature, magnesia binders are attributed as low-CO2 emission materials that can benefit the environment by reducing the energy consumption of building sector. Portland cement in different areas of construction can be replaced by magnesia binder which do not require autoclave treatment for hardening, it has low thermal conductivity and high strength properties. Magnesium-based materials are characterized by decorativeness and ecological compatibility.The experimental part of this research is based on the preparation of magnesia binders by adding raw materials and calcinated products and caustic magnesia. The aim of this study was to obtain low-CO2 emission and eco-friendly material using local dolomite waste materials, comparing physical, mechanical, thermal properties of magnesium binders.

scholarly journals A study on the mechanical, thermal properties and crystallization behavior of poly(lactic acid)/thermoplastic poly(propylene carbonate) polyurethane blends

RSC Advances ◽  
2017 ◽  
Vol 7 (73) ◽  
pp. 46183-46194 ◽  
Author(s):  
Jia Yang ◽  
Hongwei Pan ◽  
Xin Li ◽  
Shulin Sun ◽  
Huiliang Zhang ◽  
...  
Keyword(s):  
Lactic Acid ◽  
Thermal Properties ◽  
Impact Strength ◽  
Propylene Carbonate ◽  
Crystallization Behavior ◽  
Raw Materials ◽  
Poly Lactic Acid ◽  
Elongation At Break ◽  
Poly Propylene ◽  
The Impact

PPCU was prepared by using PPC and polyols as the raw materials and diphenyl-methane-diisocyanate (MDI) as the extender chain. The impact strength and elongation at break of PLA were remarkably enhanced by blending with PPCU.

Mechanical and Thermal Properties of MgAl2O4-Y3Al5O12 Ceramic Composites

2018 ◽  
Vol 281 ◽  
pp. 255-260 ◽  
Author(s):  
Jiang Bo Liu ◽  
Zhou Fu Wang ◽  
Hao Liu ◽  
Xi Tang Wang ◽  
Yan Ma
Keyword(s):  
Thermal Properties ◽  
Raw Materials ◽  
Laser Flash ◽  
Ceramic Composites ◽  
Mechanical And Thermal Properties ◽  
X Ray Diffraction ◽  
Thermal Expansion Coefficients ◽  
Expansion Coefficients ◽  
Increasing Temperature ◽  
Flash Diffusivity

MgAl2O4-Y3Al5O12 ceramic composites were prepared using fused spinel and a Y2O3 micropowder as the raw materials. The microstructure and thermal properties of the composites were characterized by X-ray diffraction, scanning electron microscopy, laser flash diffusivity measurements. The mechanical properties were also determined. MgAl2O4-Y3Al5O12 ceramic composites are composed of spinel and garnet structures. The thermal expansion coefficients of MgAl2O4 and MgAl2O4-Y3Al5O12 ceramics are similar. The measured thermal diffusivity decreases gradually with increasing temperature. Thermal conductivity of the composites is in the range of 3.3-5.8 W∙m-1∙K-1 from 400°C to 900°C.

scholarly journals Copper-Carbon Nanoforms Composites – Processing, Microstructure and Thermal Properties

2017 ◽  
Vol 62 (2) ◽  
pp. 1307-1310 ◽  
Author(s):  
K. Pietrzak ◽  
A. Gładki ◽  
K. Frydman ◽  
D. Wójcik-Grzybek ◽  
A. Strojny-Nędza ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Thermal Properties ◽  
Composite Materials ◽  
Raw Materials ◽  
Critical Concentration ◽  
Pure Copper ◽  
Copper Matrix ◽  
Carbon Phase ◽  
Composites Processing ◽  
Structure Investigations

AbstractThe main current of publication is focused around the issues and problems associated with the formation of composite materials with Cu matrix and reinforcing phases in the various carbon nanoforms. The core of the research has been focused on thermal conductivity of these composites types. This parameter globally reflects the state of the structure, quality of raw materials and the technology used during the formation of composite materials. Vanishingly low affinity of copper for carbon, multilayered forms of graphene, the existence of critical values of graphene volume in the composite are not conducive to the classic procedures of composites designing. As a result, the expected, significant increase in thermal conductivity of composites is not greater than for pure copper matrix. Present paper especially includes: (i) data of obtaining procedure of copper/graphene mixtures, (ii) data of sintering process, (iii) the results of structure investigations and of thermal properties. Structural analysis revealed the homogenous distribution of graphene in copper matrix, the thermal analysis indicate the existence of carbon phase critical concentration, where improvement of thermal diffusivity to pure copper can occur.

Thermal Properties of Carbon Fiber Reinforced Mullite Composites Derived from Sol-Gel

2017 ◽  
Vol 727 ◽  
pp. 461-465 ◽  
Author(s):  
Kuan Hong Zeng ◽  
Zhong Quan Li ◽  
Song Lin Liang ◽  
Xiao Lv ◽  
Qing Song Ma
Keyword(s):  
Heat Treatment ◽  
Thermal Properties ◽  
Carbon Fiber ◽  
Room Temperature ◽  
Coefficient Of Thermal Expansion ◽  
Raw Materials ◽  
Sol Gel ◽  
Matrix Composites ◽  
Carbon Fiber Cloth ◽  
Increasing Temperature

Mullite matrix composites with laminated and stitched carbon fiber cloth preform as reinforcement were fabricated via the route of “infiltration-drying-heat treatment” using Al2O3-SiO2 sol as raw materials. Thermal properties from room temperature to 1673K of the composites were investigated. The coefficient of thermal expansion (CTE) increases first and then decreases, and reaches a maximum of 4.83×10-6K-1 at 1273K. As a result of the further sintering of matrix, the CTE is negative at above 1300°C. The specific heat capacity increases to the maximum of 1.547J·g-1·K-1 at 1473K and remains stable at above 1473K, with a minimum of 0.756J·g-1·K-1 at room temperature. The thermal diffusivity decreases from 1.1mm2·s-1 at room temperature to 0.707 mm2·s-1 at 973K as the temperature was elevated, and remains stable at above 973K. On the contrary, the thermal conductivity is improved with increasing temperature on the whole and varies from 1.859W·m-1·K-1 at room temperature to 2.325W·m-1·K-1 at 1473K.

Crystal Structures and Thermal Properties of Bamboo Nanofiber Reinforced-Composite Friction Materials of Glass and Metal Wastes

2013 ◽  
Vol 789 ◽  
pp. 49-55
Author(s):  
Sutikno ◽  
Sukiswo Supeni Edi ◽  
Dany Sigit Saputra
Keyword(s):  
Thermal Properties ◽  
Mass Loss ◽  
Raw Materials ◽  
Friction Material ◽  
Styrene Butadiene Rubber ◽  
Butadiene Rubber ◽  
Glass Waste ◽  
Friction Materials ◽  
Total Mass Loss ◽  
Metal Machining

In Indonesia, a lot of wastes of glasses and metals have potency to be one of brake raw materials. For example, little bottles of used food packages are usually directly thrown into environment. The scraps of metal machining wastes are usually collected to be manufactured into other products. In this research, both wastes are used as fillers for brake friction materials, the effects of them on the thermal properties are studied in details. The glass wastes are crushed, grinded and filtered to simplify the mixing process with other raw materials when the fabrication of brake fiction materials done. During fabrication, samples are cured at 190°C for 3 hours. The samples are characterized using x-ray diffractometer and thermogravimetric analysis. Based on these characterizations, the increase of glass powders content plays role in increasing the percentage of crystalllinities. This is suspected the glass used as ingredient of friction material has crystalline structure. The glass waste quantity does not influence significantly on the thermal properties. During heating up to 1200°C, the mass loss occurs due to epoxy, bamboo fiber and styrene butadiene rubber decompose. The optimum composition is found at sample B2, a sample with lowest total mass loss (2 mg).

scholarly journals Reusing Jet Grouting Waste as Filler for Road Asphalt Mixtures of Base Layers

Materials ◽  
2021 ◽  
Vol 14 (12) ◽  
pp. 3200
Author(s):  
Francesca Russo ◽  
Rosa Veropalumbo ◽  
Salvatore Antonio Biancardo ◽  
Cristina Oreto ◽  
Fabio Scherillo ◽  
...  
Keyword(s):  
Raw Materials ◽  
Asphalt Mixture ◽  
Physical And Mechanical Properties ◽  
Asphalt Mixtures ◽  
Soil Consolidation ◽  
Recycled Asphalt ◽  
Road Asphalt ◽  
Limestone Aggregate ◽  
Jet Grouting ◽  
Cumulative Strain

Secondary raw materials consist of production waste or material resulting from recycling processes, currently in large quantities, which can be injected back into the economic system as new raw materials. This study proposes jet grouting waste (JGW) as filler for hot and cold asphalt mixtures applied as base layers of road pavements and investigates the physical and mechanical properties. JGW is derived from soil consolidation performed during underground roadway tunnel construction. The research compares three asphalt mixtures: (a) hot mixture containing limestone aggregate-filler (HMA), (b) HMA containing JGW (HMAJ), (c) cold recycled asphalt mixture containing JGW (CRAJ). Leaching tests of JGW and reclaimed asphalt pavement (RAP) were conducted; the best configurations of the three mixtures were determined by using the volumetric method through gyratory compaction. Three mastics with filler-to-binder ratios reflecting those of the asphalt mixtures were investigated through delta ring and ball test and frequency sweep test at 0.05% stress by using a dynamic shear rheometer. The morphology of each mixture was further investigated by scanning electron microscopy. The results showed that CRAJ with 28 days of curing time reached the indirect tensile strength (ITS) of HMA (0.73 MPa) within 14 days and, among all studied mixtures, returned the lowest cumulative strain, which was on average 30% lower than that of HMA and HMAJ. The results of this study have shown that the cold alternative mixture, CRAJ, promotes the reuse of two types of waste, RAP and JGW, as it fully meets the reference Italian Technical Standard and ensures good mixture performance in addition to conserving natural resources.

Characterization of thermal properties and combustion behaviour of asphalt mixtures in the cone calorimeter

2015 ◽  
Vol 74 ◽  
pp. 25-31 ◽  
Author(s):  
Alice Bonati ◽  
Sara Rainieri ◽  
Giovanna Bochicchio ◽  
Barbara Tessadri ◽  
Felice Giuliani
Keyword(s):  
Thermal Properties ◽  
Cone Calorimeter ◽  
Asphalt Mixtures

scholarly journals Structural and thermal properties of silk fibroin films obtained from cocoon and waste silk fibers as raw materials

2017 ◽  
Vol 200 ◽  
pp. 384-388 ◽  
Author(s):  
Natalia Jaramillo-Quiceno ◽  
Catalina Álvarez-López ◽  
Adriana Restrepo-Osorio
Keyword(s):  
Thermal Properties ◽  
Silk Fibroin ◽  
Raw Materials ◽  
Silk Fibers
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