Performance of Modified Aramid Fiber Reinforced Phenolic Foam

2012 ◽  
Vol 557-559 ◽  
pp. 258-261 ◽  
Author(s):  
Huan Yang Yu ◽  
Li Yan Wang ◽  
Guang Qing Gai
Keyword(s):  
Thermal Conductivity ◽  
Compressive Strength ◽  
Oxygen Index ◽  
Compressive Modulus ◽  
Aramid Fiber ◽  
Fiber Reinforced ◽  
Aramid Fibers ◽  
Compression Behavior ◽  
Phenolic Foam ◽  
Before And After

A chemical modification was adopted to treat the surface of aramid fibers.The influences of aramid fibers on the friability and compression behavior of phenolic foam before and after modification were studied.Compared with unmodified aramid fiber-reinforced phenolic foam ,foam reinforced with modified aramid fibers exhibits significantly lower friability, higher compressive strength and compressive modulus. The thermal conductivity and Oxygen index of modified aramid fiber- reinforced phenolic foam hasn’t obviously been changed compared with the unmodified counterpart.

scholarly journals Strength and Durability Study of Concrete Structures Using Aramid-Fiber-Reinforced Polymer

Fibers ◽  
2019 ◽  
Vol 7 (2) ◽  
pp. 11 ◽  
Author(s):  
Rajashekhar Talikoti ◽  
Sachin Kandekar
Keyword(s):  
Weight Loss ◽  
Compressive Strength ◽  
Concrete Structures ◽  
Aramid Fiber ◽  
Fiber Reinforced Polymer ◽  
Structural Elements ◽  
Fiber Reinforced ◽  
Aramid Fibers ◽  
Reinforced Polymer ◽  
Concrete Cube

Fiber-reinforced polymer (FRP) is an important material used for strengthening and retrofitting of reinforced concrete structures. Commonly used fibers are glass, carbon, and aramid fibers. The durability of structures can be extended by selecting an appropriate method of strengthening. FRP wrapping is one of the easiest methods for repair, retrofit, and maintenance of structural elements. Deterioration of structures may be due to moisture content, salt water, or contact with alkali solutions. Using FRP, additional strength can be gained by structural elements. This paper investigates the durability of aramid-fiber-wrapped concrete cube specimens subjected to acid attack and temperature rise. The study focuses on the durability of aramid-fiber-wrapped concrete by considering the compressive strength parameter of the concrete cube. Concrete cubes are prepared as specimens with a double wrapping of aramid fibers. Diluted hydrochloric acid solution is used for immersion of specimens for curing periods of 7, 30, and 70 days. The aramid-fiber wrapping reduces weight loss by 40% and improves compressive strength by 140%. In a fire resistance test, the specimens were kept in a hot air oven at a temperature of 200 °C at different time intervals. Even after fire attack, weight loss in specimens reduced by 60%, with about 150% enhancement in compressive strength due to aramid fiber.

scholarly journals Bio-based rigid polyurethane foam prepared from apricot stone shell-based polyol for thermal insulation application – Part 2: Morphological, mechanical, and thermal properties

BioResources ◽  
2020 ◽  
Vol 15 (3) ◽  
pp. 6080-6094
Author(s):  
Muhammed Said Fidan ◽  
Murat Ertaş
Keyword(s):  
Thermal Conductivity ◽  
Compressive Strength ◽  
Thermal Properties ◽  
Thermogravimetric Analysis ◽  
Polyurethane Foam ◽  
Flame Retardants ◽  
Compressive Modulus ◽  
Cell Diameter ◽  
Mechanical And Thermal Properties ◽  
Rigid Polyurethane Foam

The procedure for the liquefaction of apricot stone shells was reported in Part 1. Part 2 of this work determines the morphological, mechanical, and thermal properties of the bio-based rigid polyurethane foam composites (RPUFc). In this study, the thermal conductivity, compressive strength, compressive modulus, thermogravimetric analysis, flammability tests (horizontal burning and limited oxygen index (LOI)) in the flame retardants), and scanning electron microscope (SEM) (cell diameter in the SEM) tests of the RPUFc were performed and compared with control samples. The results showed the thermal conductivity (0.0342 to 0.0362 mW/mK), compressive strength (10.5 to 14.9 kPa), compressive modulus (179.9 to 180.3 kPa), decomposition and residue in the thermogravimetric analysis (230 to 491 °C, 15.31 to 21.61%), UL-94 and LOI in the flame retardants (539.5 to 591.1 mm/min, 17.8 to 18.5%), and cell diameter in the SEM (50.6 to 347.5 μm) of RPUFc attained from liquefied biomass. The results were similar to those of foams obtained from industrial RPUFs, and demonstrated that bio-based RPUFc obtained from liquefied apricot stone shells could be used as a reinforcement filler in the preparation of RPUFs, specifically in construction and insulation materials. Moreover, liquefied apricot stone shell products have potential to be fabricated into rigid polyurethane foam composites.

Study on the Preparation and Properties of Fiber Reinforced Foamed Cement Material

2013 ◽  
Vol 327 ◽  
pp. 40-43
Author(s):  
Xiao Long Li ◽  
Guo Zhong Li
Keyword(s):  
Thermal Conductivity ◽  
Compressive Strength ◽  
Flexural Strength ◽  
Portland Cement ◽  
Ordinary Portland Cement ◽  
Raw Materials ◽  
Dry Density ◽  
Fiber Reinforced ◽  
Cement Material ◽  
Insulation Materials

The ordinary portland cement was used to prepare foamed cement insulation materials by physical foaming method. The influence of different process of fiber added to the foamed cement insulation materials on its performance was studied and the optimum mix ratio of raw materials was determined. The results showed that the glass fire could be evenly dispersed in the slurry by dry adding technology and got better enhanced effect. When the dosage of glass fire was 0.9%, the performance of the foamed cement material as follows: dry density of 318 kg/m3, 3d flexural strength of 0.61MPa, 3d compressive strength of 1.05MPa, thermal conductivity of 0.065W/(m·k). The reinforce mechanism of glass fire was explored.

The Wear of Aramid Fiber Reinforced Brake Pads: The Role of Aramid Fibers

1994 ◽  
Vol 37 (3) ◽  
pp. 559-565 ◽  
Author(s):  
Takahisa Kato ◽  
Akira Magario
Keyword(s):  
Aramid Fiber ◽  
Fiber Reinforced ◽  
Aramid Fibers ◽  
Brake Pads

Mechanical Properties and Dynamic Mechanical Behavior for Long Aramid Fiber Reinforced Impact Polypropylene Copolymer

2012 ◽  
Vol 591-593 ◽  
pp. 1079-1082 ◽  
Author(s):  
Hao Tan ◽  
Hong Sheng Tan ◽  
Xin Lei Tang ◽  
Yan Gang Wang ◽  
Li Ping Li
Keyword(s):  
Mechanical Properties ◽  
Mechanical Behavior ◽  
Aramid Fiber ◽  
Fiber Reinforced ◽  
Aramid Fibers ◽  
Dynamic Mechanical ◽  
Composite Deformation ◽  
Dynamic Mechanical Behavior ◽  
Single Screw Extruder ◽  
Impact Polypropylene Copolymer

Composites of continuous aramid fiber reinforced impact polypropylene copolymer (IPC) were prepared using a cross-head impregnation mold by self-design fixed on a single screw extruder, and pelleted by a pelleter for injection molding to prepare testing specimens. The mechanical properties of long aramid fibers reinforced impact polypropylene copolymer (IPC) composites were studied. Micrographs of fracture surface of tensile specimens and dynamic mechanical behavior for the composites were analyzed by scanning electron microscope (SEM) and dynamic mechanical analyzer (DMA). The results of experiments show that, the tensile and flexural strengths increased obviously with the aramid fibers content in the composites. SEM results show the compatibility between the aramid fiber and matrix is very poor. The results of the dynamic mechanical behavior of long aramid fibers reinforced IPC composites show that the composite deformation resistance and glass transition temperature increased evidently with the addition of aramid fibers.

Compression behavior of cylinder reinforced with aramid fiber reinforced polymer

2020 ◽  
Vol 27 ◽  
pp. 764-771
Author(s):  
S. Sivasankar ◽  
L. Ponraj Sankar ◽  
A. Praveen Kumar ◽  
M. Shunmugasundaram
Keyword(s):  
Aramid Fiber ◽  
Fiber Reinforced Polymer ◽  
Fiber Reinforced ◽  
Compression Behavior ◽  
Reinforced Polymer

scholarly journals Factors influencing thermal conductivity and compressive strength of natural fiber-reinforced geopolymer foams

Open Ceramics ◽  
2021 ◽  
Vol 5 ◽  
pp. 100065
Author(s):  
Katharina Walbrück ◽  
Lisabeth Drewler ◽  
Steffen Witzleben ◽  
Dietmar Stephan
Keyword(s):  
Thermal Conductivity ◽  
Compressive Strength ◽  
Natural Fiber ◽  
Fiber Reinforced ◽  
Factors Influencing

scholarly journals Validity of Amontons’ law for run-in short-cut aramid fiber reinforced elastomers: The effect of epoxy coated fibers

Friction ◽  
2019 ◽  
Vol 8 (3) ◽  
pp. 613-625
Author(s):  
M. Khafidh ◽  
D. J. Schipper ◽  
M. A. Masen ◽  
N. Vleugels ◽  
W. K. Dierkes ◽  
...  
Keyword(s):  
Contact Pressure ◽  
Normal Force ◽  
Threshold Value ◽  
Aramid Fiber ◽  
Fiber Reinforced ◽  
Aramid Fibers ◽  
Frictional Behavior ◽  
Pin On Disc ◽  
Counter Surface ◽  
Reinforcing Filler

Abstract Friction between two contacting surfaces is studied extensively. One of the known friction theories is Amontons’ law which states that the friction force is proportional to the normal force. However, Amontons’ law has been found to be invalid for elastomers. In the present study, the validity of Amontons’ law for short-cut aramid fiber reinforced elastomers is studied. Two types of fillers are used to reinforce the elastomers, namely highly dispersible silica and short-cut aramid fibers. Short-cut aramid fibers with two different surface treatments are used, namely non-reactive fibers with standard oily finish (SF-fibers) and fibers treated with an epoxy coating (EF-fibers). A pin-on-disc tribometer is used to investigate the frictional behavior of the composites in sliding contact with a granite counter surface. The results show that, after the run-in phase, Amontons’ law is valid for those composites that are reinforced by short-cut aramid fibers (without reinforcing filler, i.e., silica) if the contact pressure is below a threshold value. However, once the contact pressure exceeds this threshold value, Amontons’ law will be invalid. The threshold contact pressure of the composites containing EF-fibers is higher than of the composites containing SF-fibers. The composites that are reinforced by silica and short-cut aramid fibers do not follow Amontons’ law.

The influence of the addition of ground olive stone on the thermo-mechanical behavior of compressed earth blocks

2020 ◽  
Vol 108 (2) ◽  
pp. 203
Author(s):  
Samia Djadouf ◽  
Nasser Chelouah ◽  
Abdelkader Tahakourt
Keyword(s):  
Thermal Conductivity ◽  
Compressive Strength ◽  
Mechanical Behavior ◽  
Agricultural Waste ◽  
Hydraulic Press ◽  
Dry Density ◽  
Olive Stone ◽  
Compressed Earth Blocks ◽  
Clay Matrix ◽  
Earth Blocks

Sustainable development and environmental challenges incite to valorize local materials such as agricultural waste. In this context, a new ecological compressed earth blocks (CEBS) with addition of ground olive stone (GOS) was proposed. The GOS is added as partial clay replacement in different proportions. The main objective of this paper is to study the effect of GOS levels on the thermal properties and mechanical behavior of CEB. We proceeded to determining the optimal water content and equivalent wet density by compaction using a hydraulic press, at a pressure of 10 MPa. The maximum compressive strength is reached at 15% of the GOS. This percentage increases the mechanical properties by 19.66%, and decreases the thermal conductivity by 37.63%. These results are due to the optimal water responsible for the consolidation and compactness of the clay matrix. The substitution up to 30% of GOS shows a decrease of compressive strength and thermal conductivity by about 38.38% and 50.64% respectively. The decrease in dry density and thermal conductivity is related to the content of GOS, which is composed of organic and porous fibers. The GOS seems promising for improving the thermo-mechanical characteristics of CEB and which can also be used as reinforcement in CEBS.

Sign in / Sign up

Export Citation Format

Share Document