Papers by Keyword: Compression Strength

Abstract: The purpose of the study was to determine the effect of plastic waste on the compressive strength, water absorption, and temperature resistance of lightweight bricks for green architecture. This study is included in quantitative research using the Experimental method. The variations of plastic that will be used are PETE, HDPE, and LDPE plastic types, each of which is 10%, 20%, and 30% of the weight of cement. The test object made is a cylindrical lightweight brick with a diameter of 10.8 cm and a height of 5 cm. The mixture of lightweight bricks made includes cement, sand, foam agent, and water. After obtaining the compressive strength, water absorption, and temperature resistance values of each test object, it is then compared with the benchmark object, namely lightweight bricks without a plastic mixture to see if there is an effect of the plastic mixture. There is an effect of the plastic mixture on the compressive strength seen from the increase in compressive strength in lightweight bricks mixed with 10% PETE plastic. There is an effect of the plastic mixture on the water absorption seen from the increase in water absorption in lightweight bricks mixed with 10% PETE plastic. There is an effect of plastic mixture on temperature resistance as seen from the increase in compressive strength of lightweight bricks mixed with 30% HDPE plastic. It can be concluded that plastic can affect the quality of lightweight bricks and is suitable for highly recyclable materials that can be utilized in green architecture.

Abstract: The present work includes an investigation of the effect of α-alumina nanoparticles addition to aluminum-based nanocomposites on its mechanical properties and finding the optimal value of alumina nanoparticles that give the best properties. Experimental work includes manufacturing samples of aluminum-based nanocomposite reinforced with alumina nanoparticles by powder metallurgy- hot forging process. Mechanical properties were tested. The results show an increase in hardness and compression yield strength with increasing the weight percentage of alumina nanoparticles, while the wear rate decreased to certain percentages of addition and then increased again. From the experimental results, multiple regression analysis methods have been used to obtain an empirical equation for predicting the mechanical properties and describe the behavior of hardness, compression strength, and wear rate. Genetic Algorithm Optimization was applied to find the optimum value of alumina nanoparticles weight percentage which gives good mechanical properties.

Abstract: WNbMoVAl_xCr_y RHEA series are consolidated via spark plasma sintering with using mechanically alloyed powders. Mechanical alloying of W NbMoVAlCr alloy was conducted for up to 8 hours at 2-hour intervals to determine the ideal alloying time. Mechanical alloying resulted in the formation of a single phase, with the disappearance of elemental peaks and flattening of peaks. XRD peaks revealed a body-centred cubic and Laves phases. SEM and point EDS results showed homogeneous distribution of elements. Mechanical alloying had a positive effect up to 6 hours, with the highest hardness value of 12.57 GPa. The highest compressive strength at room temperature was 1397 MPa, while the lowest strength at 900°C was 172 MPa. Al and Cr had no clear effect on hardness and compression strength, with no clear trend on improvement or reduction in mechanical properties.

Abstract: Everyone now lives in a technologically highly hybridised environment; mobile technology is regarded as one of the most significant of all technologies. Inside the phone is the entire world. This article primarily focuses on recycling e-waste into composites (especially waste from mobile phones). The range of products used for this study included basic and smartphones. The primary product chosen was the display glass from smartphones. With the use of recent literature reviews, the problem was identified. Many studies focused on polyester resins with ceramic powders and their composites. The mobile display powder has been mixed with Polyester resin. The mobile phone display electronic waste (MPDEW), like polyester resin, was cost-effective. Mobile phone waste was used as filler in various proportions including 0, 5 and 10 %. To determine the effect of e-waste with polymer composites, the mechanical properties such as tensile, compression, flexural, and impact were undertaken. The scanning electron microscope was also used for the microstructural analysis.

Abstract: This research aims to analyze the mechanical behavior of concrete reinforced with polyolefin fibers. The intention is to evaluate the possibility of using concrete as a structural material without steel bars in its interior. For this purpose, specimens with different dosages of polyolefin fibers were prepared, and bending and compression tests were carried out. The results show no significant increase in mechanical strengths, especially in bending, but it is interesting in the mechanical behavior after the first cracking. Controlling cracking is considered beneficial for sustainability.

Abstract: Using alternative resources from industrial by-products to produce aggregates while keeping production costs as low as possible would be environmentally beneficial and profitable. This study aims to examine the effect of the pore on mortar properties with eggshell powder (ESP) as its fine aggregate alternative based on two fundamental properties: microstructural and mechanical strength. The study replaced the sands (by volume) with ESP in the usual mortar mix with 10%, 20%, 30%, 40% and 50% chicken eggshell powder. The mortars underwent a wet curing period of 56 days with five observation days. The standard mortar properties, such as pH, carbonation depth, compressive strength, and sorptivity, were investigated. The findings show that the replacement rate significantly impacts the water-cement ratio, carbonation rate, sorptivity and compression strength. The additional calcareous of ESP is believed to have improved the mechanical component of the connection. There are no significant differences in pH for the control (R₀) and modified mortars. The greatest replacement percentage of 20% is advantageous for carbonation rate acceleration, sorptivity and early compressive strength. However, if the specifier focuses on pH and sorptivity improvements, no formulation alteration is required.

Abstract: The aluminum 4.5 wt. % copper alloy was melted in an electrical resistance furnace and atomized to produce the powder of 350 µm to 500 µm size of different shapes and sizes. The atomized powder was graded using standard set of sieves. The powder is compacted with the help of spark plasma sintering by applying the required pressure and temperature simultaneously. The sintering pressure of 25 MPa and temperatures of 480 °C and 540 °C was employed to produce sintered compacts at two different temperatures. The density of the sintered compact was measured using Archimedes principle. The surface topography of both the compacts revealed the cellular, elongated grains and dendritic microstructure. The average micro Vickers hardness of compact sintered at 480 °C and 540 °C were found to be 55.9 HV1 and 65.4 HV1 respectively. The compression strength of compact sintered at 480 °C is 185 MPa and the compact sintered at 540 °C is reported as compacts was reported as 250 MPa.

Abstract: In the present paper, there were considered the issues of developing optimal compositions and the study of the impact of sulfur addition on strength properties of sulfur containing binders for building materials. The purpose of the research is the development of scientific principles of physical and chemical mechanics for detoxification of wastes produced by oil-processing and metallurgical industries while obtaining sulfur containing binders with enhanced adhesive and strength properties altered by the directed mechanochemical effects. While carrying out the scientific research, there have been used standard measurement methods and the methods of analysis of physical and mechanical properties of sulfur containing binding compositions obtained by the contemporary methods of analysis and testing equipment. As the result of the research, new binding substances with improved adhesive properties have been obtained and sulfur containing structural materials with the complex of enhanced physical and mechanical properties have been developed on their basis.

Abstract: Poly methyl methacrylate PMMA polymer is used continuously and popular in dental applications during the previous years because it has a set of good properties, including ease of manufacture, light weight, low cost and others. Yet, it has weak mechanical properties under pressure for a long time. The aim of this research was to manufacture composite material with advance mechanical properties by adding two types of fibers, (polypropylene PP and Poly acrylonitrile PAN) to the matrix polymer PMMA. In this research, groups of composite samples were prepared with selected weight ratios of both fibers (1.5, 3.5, 5.5 and 7.5 wt. %). Compression strength, hardness value and surface roughness in addition to the Morphology examination were the properties that been evaluated in the normal circumstances. The results showed an increase in compressive strength, hardness and surface roughness, during the increase of reinforcing ratio of the fibers. There was a clear increase in the compressive strength during the increase in the weight ratio of both types of fibers, the largest value was (300MPa) for PMMA/PAN samples that obtained at the highest reinforcing ratio compared to (240 MPa and 119 MPa) PMMA/PP and the neat PMMA, respectively. The hardness increases noticeable with the increase of both type of fibers the reinforcement ratio, and reaches its highest value at the ratio of (7.5wt.%) for both type (87), compared to the neat sample (81). On the other hand, surface roughness increased during the increase of fibers ratio used which negatively affected the samples comparing to the neat polymer. Through SEM test, it was found that the fracture surface of the neat PMMA was homogeneous, while it is almost continuous for both PMMA/PP and PMMA/PAN.

Abstract: The aim of the research was to investigate the performance of components of metallurgical wastes in the production of high temperature refractories by self-propagating high-temperature synthesis method. The effect of the filter cake waste amounts and their chemical and physical features on refractories’ mechanical and thermal properties were discussed in this study. A detailed thermochemical assessment of the expected chemical reactions in SHS process based on the waste compositions with binder were carried out. The experiments on the obtaining of carbon containing refractories based on the waste of filter cake were conducted. Thermal conductivity coefficients were determined in the context of the thermal properties of refractory samples via a heat flow meter. In addition, mechanical properties were determined by compression strength.