Influence of Special Additives on Characteristics of Concrete with SiC Based Filler

2020 ◽  
Vol 986 ◽  
pp. 41-49
Author(s):  
Radka Pernicova ◽  
Tomas Kolomaznik
Keyword(s):  
Mechanical Properties ◽  
Silicon Carbide ◽  
Bulk Density ◽  
Surface Properties ◽  
Mechanical Tests ◽  
Measured Data ◽  
Foundry Industry ◽  
Different Types

This document explains and demonstrates the influence of plasticizing additives on concrete – wet cured concrete with aggregate based on silicon carbide specifically. These special products have been designed for the foundry industry and have specific requirements for treatment in their early curing stage. The paper deals with the optimization of the currently used formula in order to increase their mechanical and surface properties by adding several different types of plasticizing additives and/or combinations thereof. Indicators of the measured characteristics have been mechanical tests, surface properties, and bulk density, which represented the SiC indicator of the mixture. With regard to the measured data, it can be stated that the effect of the plasticizing additive on special concrete with SiC aggregate have been considerable and depended very much on the type of additive used and its dosage, as the resulting mechanical properties differed by up to 40%.

scholarly journals MECHANICAL CHARACTERISTICS FOR COMPOSITE MATERIALS USING COMMERCIAL EPOXY RESINS AND DIFFERENT FILLERS

2021 ◽  
Vol 56 (5) ◽  
pp. 179-185
Author(s):  
Omar A. Amin ◽  
S. A. Hassan ◽  
M. A. Sadek ◽  
M. A. Radwan ◽  
Hany A. Elazab
Keyword(s):  
Mechanical Properties ◽  
Epoxy Resin ◽  
Epoxy Resins ◽  
Three Dimensional ◽  
Mechanical Tests ◽  
Diglycidyl Ether ◽  
Dimensional Structure ◽  
Polymeric Chain ◽  
Hydroxyl Groups ◽  
Different Types

Epoxy resins are thermoset polymers that consist of epoxide groups in their molecular structure. It shows many attractive characteristics like strong adhesion, excellent mechanical strength, low shrinkage, excellent insulator, excellent chemical stability for acidic and basic environments, and microbial resistance due to the presence of hydroxyl groups and ether bonds and its three-dimensional structure. Many of these characteristics can be modified by adding strong bindings in the polymeric chain to give more improved characteristics. This research aims to prepare a composite material using epoxy resin and different types of fillers to achieve resistance to high kinetic energy impact. Experimental work is focused on preparing cured epoxy resin samples by using diglycidyl ether of bisphenol A (DGEBA) resin with tertiary amine as a hardener. In order to obtain different samples with different properties, we add different types of fillers, then mechanical tests are used to measure the mechanical properties of the samples. The results have proved that fiberglass is the best filler added to epoxy resins to improve its mechanical properties.

scholarly journals Evaluation of the mechanical characteristics of hygrothermally aged 2-D basalt-aramid/epoxy hybrid interply composites

2021 ◽  
Vol 2070 (1) ◽  
pp. 012234
Author(s):  
Yogeesha Pai ◽  
Dayananda Pai K ◽  
M Vijaya Kini
Keyword(s):  
Mechanical Properties ◽  
Moisture Absorption ◽  
Mechanical Performance ◽  
Mechanical Tests ◽  
Moisture Uptake ◽  
Molding Process ◽  
Micro Cracks ◽  
Different Types ◽  
Temperature Ageing ◽  
Saturation Absorption

Abstract Polymer composites used in outdoor applications are exposed to environmental factors such as temperature and moisture which may affect the mechanical performance of the composites. In this study, the influence of moisture absorption on the mechanical properties of basalt-aramid/epoxy hybrid interply composites were evaluated. Two different types hybrid interply composites were taken for the investigation namely (301 A/03 B/301 A) and (451 A/03B/451 A). Composites were prepared using compression molding process and cut specimens were subjected to three different ageing environments for 180 days. Selected ageing conditions are, (i) ambient temperature ageing (ii) Sub-zero temperature ageing (−10°C) and (iii) Humid temperature ageing (40°C and 60% Relative humidity). Mechanical tests of the aged composites were carried out to analyse the behaviour of the composites. Moisture uptake of the specimens follow Fick’s law of diffusion with saturation absorption of 5.44%, 3.12% and 1.80% for ambient, sub-zero and humid specimens respectively. Results revealed that (301 a/03 B/301 a) aged composites possess higher mechanical properties compared to (451 a/03 B/451 a) aged composites. Highest reduction in properties were observed in ambient aged specimens followed by humid and sub-zero specimens. Scanning electron microscopy (SEM) was employed to observe the damage modes of the fractured specimens. Matrix deterioration, micro cracks and fibre fracture were the major types of failures observed in aged laminates.

Mechanical Behavior of Glued Laminated Pressed Bamboo Guadua Using Different Adhesives and Environmental Conditions

2014 ◽  
Vol 600 ◽  
pp. 57-68 ◽  
Author(s):  
Patricia Luna ◽  
Caori Takeuchi ◽  
Edwar Cordón
Keyword(s):  
Mechanical Properties ◽  
Relative Humidity ◽  
Environmental Conditions ◽  
Urea Formaldehyde ◽  
Experimental Tests ◽  
Mechanical Tests ◽  
Different Types ◽  
Humidity Chamber ◽  
Flexural Tests ◽  
The One

This paper presents the mechanical properties measured on glued laminated pressed guadua samples. Experimental tests like shear parallel to fiber, tensile and shear perpendicular to fiber and flexural tests were carried out using three different types of adhesives: European Melamine Urea Formaldehyde, Colombian Melamine Urea Formaldehyde, and Polivinil Acetate humidity resistant. In order to study the behavior of the material in aggressive environmental conditions, half of the samples used in the mechanical tests were introduced in a temperature and humidity chamber for 45 days set to 45°C of temperature and 95% of relative humidity, usual environmental conditions in Chocó Colombia.The results showed that the highest values of mechanical strength were obtained for samples made with European Melamine Urea Formaldehyde. In addition, it was found that this adhesive was the one with better behavior under the aggressive environmental conditions simulated.

Evaluating the Influence of Fiber Composition and Structure of Knitting Fabrics on Total Hand Value (THV)

2016 ◽  
Vol 848 ◽  
pp. 211-215
Author(s):  
Nareerut Jariyapunya ◽  
Blažena Musilová ◽  
Marie Koldinská
Keyword(s):  
Mechanical Properties ◽  
Surface Roughness ◽  
Surface Properties ◽  
Evaluation System ◽  
Tensile Shear ◽  
Knitted Fabrics ◽  
Fiber Composition ◽  
Composition And Structure ◽  
Different Types ◽  
Shear Bending

This paper presents analytical and experimental procedures to evaluate the influence of knitted fabrics on the total hand value (THV) for women’s winter thin dress. We examined and compared its mechanical properties, such as tensile, shear, bending, compression, surface roughness and friction properties, measured by the Kawabata Evaluation System for Fabrics (KES FB-Auto), of knitted fabrics with different fiber compositions and different types of knitted structures. The obtained results showed that the knitted structures have significantly influenced on the total hand value (THV) whereas the fiber compositions have shown a less effect on (THV). The existing results prove that the evaluation by KES FB-Auto system has been more beneficial for its basic of mechanical and surface properties. Moreover, the results could be analyzed for its new designing patterns for a refined, comfortable stretch fit.

scholarly journals Mechanical Behaviour of Micro and Nano Scaled Silicon Carbide Reinforced Al 6063 Metal Matrix Composite

2020 ◽  
Vol 9 (3) ◽  
pp. 3298-3303
Keyword(s):  
Mechanical Properties ◽  
Silicon Carbide ◽  
Impact Strength ◽  
Metal Matrix ◽  
Aluminum Matrix ◽  
Mechanical Tests ◽  
Reinforcement Particle ◽  
Aluminum Matrix Composites ◽  
Matrix Composites ◽  
Weight Percentage

In this research study Al 6063 is used as the base matrix element, due to less weight, high specific strength, impact strength and good mechanical properties. Further, SiC are reinforced in Al 6063 matrix for enhancing its properties. Stir casting process has been accomplished for fabricating the (Al 6063-SiC) composites. In this experiment two various size of reinforcement particle are utilized, one of them is micro sized and another one is nano sized. Micro sized reinforcement particle has dimensions of (25-40µ), while nano sized particle consists dimensions of 500nm. The weight fraction of the micro and nano sized SiC particle taken in this experiment are in order of 0%, 2%, 4%, 6%, 8%, and 10% respectively. Various mechanical tests such as hardness, tensile tests and impact tests were conducted for determining the effect of micro and nano sized SiC reinforced aluminum matrix composites. The comparative study related with impact strength, hardness and tensile strength of micro and nano sized silicon carbide reinforced with aluminum matrix composites were shown in this work. There is an enhancement of mechanical properties has been observed with enhancement in weight percentage of micro sized silicon carbide, on other hand there is also a decrease in mechanical properties has been found while increasing the weight percentage of nano sized silicon carbide. The main objective of this paper is to enhance the mechanical properties of the Al 6063 metal matrix with reinforcing silicon carbide particle.

scholarly journals Sustainable Mortars for Application in the Cultural Heritage Field

Materials ◽  
2021 ◽  
Vol 14 (3) ◽  
pp. 598
Author(s):  
Michelina Monaco ◽  
Marianna Aurilio ◽  
Anna Tafuro ◽  
Mariateresa Guadagnuolo
Keyword(s):  
Mechanical Properties ◽  
Cultural Heritage ◽  
Mechanical Test ◽  
Mechanical Tests ◽  
Historical Study ◽  
Test Results ◽  
Lime Mortars ◽  
Different Types ◽  
Heritage Buildings ◽  
Italian Territory

A large part of the world’s architectural heritage is composed of masonry buildings located in seismic areas, and its vulnerability has been shown by the damage caused by the last earthquakes. Meeting the safety demands of cultural heritage buildings according to the performance-based seismic codes requires a deep knowledge of the mechanical properties of material components. Traditional mortars are among these. However, significant samples of structural mortars cannot be taken from existing masonry walls to perform mechanical tests, but tests can, alternatively, be conducted on samples realized according to traditional instructions for composition. Based on a historical study of mix proportions, this paper presents the results of a mechanical test campaign of traditional mortars. The samples were obtained combining lime and pozzolan according to the proportions derived from ancient treatises. The laboratory tests were performed taking into account three different types of limes, and a discussion involving the results presented in the literature is provided. Besides the contribution to fulfilling the lack of knowledge about the mechanical properties of traditional lime mortars, the test results are good references for on-site preparation of mortars for use in restoration. There is a focus on natural pozzolanic lime mortars, widely used in the Neapolitan area and, in general, in the whole Italian territory.

Characterization of the Composition, Structure, and Mechanical Properties of Endocarp Biomass

2022 ◽  
Vol 65 (1) ◽  
pp. 67-74
Author(s):  
Makua C. Vin-Nnajiofor ◽  
Wenqi Li ◽  
Seth Debolt ◽  
Yang-Tse Cheng ◽  
Jian Shi
Keyword(s):  
Mechanical Properties ◽  
Energy Consumption ◽  
Bulk Density ◽  
Lignin Content ◽  
Specific Energy Consumption ◽  
Mechanical Tests ◽  
Economic Feasibility ◽  
List Type ◽  
Supply Logistics ◽  
Promising Source

HighlightsEndocarps have higher lignin content, cellular and bulk density, and hardness than typical biomass feedstocks.The impacts of lignin content, bulk density, and mechanical properties on energy consumption are discussed.Endocarps can be a potential feedstock for a biorefinery coproducing biofuel and bioproducts.Abstract. Lignin is an abundant biopolymer and a promising source of feedstock for high-value chemicals and materials. This study aims to characterize the lignin-rich endocarp biomass and identify features of this unique feedstock that are relevant to feedstock preprocessing and logistics. The chemical composition and cellular structure of walnut and peach endocarps were characterized using HPLC and scanning electron microscopy (SEM) imaging. Mechanical properties of the endocarps were investigated using nanoindentation. Mechanical tests revealed hardness values of up to 0.48 and 0.40 GPa for walnut and peach endocarps, respectively. With screen sizes of 1 and 2 mm, the specific energy consumption was 9.21 and 1.86 MJ kg-1 for walnut and 12.6 and 2.72 MJ kg-1 for peach, respectively, as determined using a knife mill. Milling energy consumption was correlated to screen size, lignin content, bulk density, and mechanical properties. This study provides critical information on feedstock supply logistics necessary to implement a novel feedstock in biorefineries and evaluate the economic feasibility for coproduction of biofuels and lignin-derived products. Keywords: Biomass feedstock, Lignin, Mechanical properties, Nanoindentation, Size reduction.

scholarly journals Effect of production temperature on thermal and mechanical properties of polystyrene–fly ash composites

2020 ◽  
Vol 29 ◽  
pp. 2633366X2091798 ◽  
Author(s):  
Ayse Bicer
Keyword(s):  
Mechanical Properties ◽  
Thermal Properties ◽  
Fly Ash ◽  
Low Cost ◽  
Construction Material ◽  
Mechanical Tests ◽  
Waste Materials ◽  
Coating Materials ◽  
Different Types ◽  
Production Temperature

This study was conducted to produce a novel construction material by using two different types of waste material consisting of fly ash and fragmented polypropylene (PP). These two materials were mixed on various ratios, and samples with smooth surface were obtained by compressing with 50 kg of weight after each mixture is heated on temperatures of 225°C, 250°C, and 275°C and poured into the molds. Thermal and mechanical tests were performed on the prepared samples. As a result, with the evaluation of two waste materials such as fly ash and PP, (i) the contamination caused by the waste materials will be prevented; (ii) as the fly ash rate increases, the thermal properties of samples produced under 225°C of temperature will be enhanced; (iii) as the fly ash rate increases, the thermal properties of samples produced under 225°C of temperature will be enhanced, and PP ratio and production temperature must be high in order to improve mechanical properties; (iv) the produced composite materials bear the low-cost heat, acoustics, and water insulation, while it will also be possible for the same to be used as coating materials on the walls and tiling in the buildings.

scholarly journals Corrugated Structure Reinforcing Aluminum Foam

2021 ◽  
Author(s):  
Massimo Durante ◽  
Luca Boccarusso ◽  
Antonio Formisano ◽  
Dario De Fazio ◽  
Antonio Viscusi ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Experimental Tests ◽  
Mechanical Tests ◽  
Compression Tests ◽  
Foaming Agent ◽  
Low Weight ◽  
Optimal Value ◽  
Different Types ◽  
Potential Applications ◽  
Corrugated Structure

Metal foams have a number of established niche market and potential applications under investigation due to their peculiarities including thermal, acoustic and mechanical properties at low weight. In order to produce structures resistant at high temperature and acting as barrier to the fire, metals with closed cells are often required, and one of the most consolidate manufacturing process for their production is the gas releasing particles decomposition in semisolids, by means of which a foam is created by a foaming agent dispersed into a precursor. In previous researches, the authors have investigated the possibility of foaming the aluminum starting by a precursor, placed between two skins consisting of steel grids, in order to obtain a sandwich structure at the same time of the foaming step. In line to continue on this topic and to improve the compression strength of the aluminum-foamed core, in this work the steel grid was used both as skins and as a corrugated skeleton inside the core. Different types of sandwich structures were manufactured, following some experimental tests executed to determine the optimal value of temperature and time to foam the precursor. Then, compression tests were carried out, in order to investigate the effectiveness of the proposed solution on the improvement of this mechanical behavior. The mechanical tests highlighted the increase of mechanical properties using this type of corrugated core.

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