scholarly journals Effect of Organic Material Type and Proportion on the Physical and Mechanical Properties of Vegetation-Concrete

2018 ◽  
Vol 2018 ◽  
pp. 1-8 ◽  
Author(s):  
Daxiang Liu ◽  
Baohua Zhang ◽  
Yueshu Yang ◽  
Wennian Xu ◽  
Yu Ding ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Grain Size ◽  
Organic Material ◽  
Physical And Mechanical Properties ◽  
Remarkable Effect ◽  
Material Type ◽  
Distillers Grain ◽  
Main Components ◽  
Corn Distillers ◽  
Protection Engineering

Vegetation-concrete is one of the most widely used substrates in ecological slope protection engineering. The porosity of the vegetation-concrete must be high enough to satisfy the growth needs of the plant roots, while the mechanical properties must be strong enough to satisfy the self-stability requirement of the substrates on the slope. It is necessary to balance these two aspects in the design of vegetation-concrete. As one of the main components in vegetation-concrete, organic material has a remarkable effect on both the porosity and the mechanical properties of the substrate. In this paper, four types of common organic materials (rice husks, sawdust, and corn distillers’ and unhulled rice distillers’ grain) are chosen to research the effect of the organic material type and proportion on the porosity and mechanical properties of the substrate. The experimental results show that the porosity of samples containing corn distillers’ grain is clearly higher than those of the other samples types, while situation of the mechanical properties is the opposite. It can be concluded that organic material with a large grain size is not suitable for use in vegetation-concrete directly and needs to be crushed before use to prevent crack formation. The research results also show that the rates of increase in porosity decrease with more organic material added, while the rates of decrease in the unconfined compressive strength and the elasticity modulus increase. From a comprehensive consideration of the required mechanical properties and plant growth, organic material with a small grain size is most suitable for use in vegetation-concrete, and the suitable proportion is between 7% and 9%.

scholarly journals Comparison of physical and mechanical properties of mining waste with a grain size up to 2 mm reinforced with cement CEM I and CEM III

2019 ◽  
Vol 106 ◽  
pp. 01023
Author(s):  
Justyna Morman-Wątor
Keyword(s):  
Mechanical Properties ◽  
Grain Size ◽  
Fine Particles ◽  
Physical And Mechanical Properties ◽  
Mining Waste ◽  
Soil Testing ◽  
Mechanical Parameters ◽  
Freeze Resistance

The article presents the results of tests for mining waste mixtures - cement. The addition of cement was aimed at limiting the leaching of fine particles and improving physical and mechanical parameters. The studies used cement CEM I 42.5 R and CEM III/ A 42.5N - LH / HSR / NA and plasticizing sealant. The paper presents the results of freeze resistance, swelling tests, pH of water leachate and oedometer soil testing.

Multi-Class Grain Size Model for Forged Alloy 718 Aircraft Parts

2021 ◽  
Vol 1016 ◽  
pp. 499-508
Author(s):  
Christian Gruber ◽  
Peter Raninger ◽  
Martin Stockinger ◽  
Christian Bucher
Keyword(s):  
Mechanical Properties ◽  
Grain Size ◽  
Size Distribution ◽  
Grain Size Distribution ◽  
Base Alloy ◽  
Physical And Mechanical Properties ◽  
Initial Distribution ◽  
Alloy 718 ◽  
Process Data ◽  
Size Model

The evolution of microstructural features such as local grain size and local grain size distribution are essential in view of the final physical and mechanical properties of the nickel base alloy 718 for aircraft parts forged in a multi-step production route. Due to increasing standards and the need of the prediction of fracture mechanical properties, a multi-class grain size model for a more detailed microstructure prediction is necessary. Therefore, a multi-class model considers the real initial non-uniform grain size distribution and structure of the pre-material at the beginning of the forging process, which affects the evolution of grain sizes during thermo-mechanical treatment and leads to different results than commonly used uniform grain structures. The initial distribution is defined by grain classes according the ASTM standard. It is shown that the presence of different classes and distributions of grains are as import as the applied strain, strain rate and temperature on dynamic, meta-dynamic and static recrystallization. Additionally, dissolution processes of delta phase and grain growth kinetics are included in the model to properly indicate the recrystallized fractions and represent the resulting multi-class microstructure. A series of simulations with different initial distributions is discussed and compared with examined forged samples in terms of the resulting microstructure for typical forging parameters. Based on these results the microstructure model can be used in combination with collected process data to predict the resulting properties and for the design of new aircraft parts.

scholarly journals Silicon dioxide dispersed effects on some physical and mechanical properties of Al2Si2O5(OH)4

2021 ◽  
Vol 2114 (1) ◽  
pp. 012021
Author(s):  
Tarik T. Issa ◽  
Noor Kadhum Abid ◽  
Mustafa Kadhum Abid
Keyword(s):  
Mechanical Properties ◽  
Thermal Conductivity ◽  
Grain Size ◽  
Silicon Dioxide ◽  
Compression Strength ◽  
Sintered Density ◽  
Physical And Mechanical Properties ◽  
Linear Shrinkage ◽  
Weight Percentage ◽  
The Common

Abstract Kaolin and silica of 50 μm grain size were used in different weight percentage. Four combinations have been selected as green compacted bodies. Different sintering temperatures ranging from (1000 – 1400) °C were used to sintered all the combinations under static air. The sintered density, thermal conductivity compression strength and linear shrinkage were tested after sintering. The common behavior indicated that the improvement with its optimum results was found at the combination (Kaolin 20-SiO2 80) Wt. %, sintered at 1400 °C, for 3 hours under static air.

scholarly journals Using the spark-plasma technique to produce the mullite-sialon-ZrB2 materials and their properties examination

2018 ◽  
pp. 22-30 ◽  
Author(s):  
A. V. Hmelov
Keyword(s):  
Mechanical Properties ◽  
Grain Size ◽  
Elasticity Modulus ◽  
Physical And Mechanical Properties ◽  
Linear Shrinkage ◽  
Plasma Technique ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
Crystal Phases ◽  
Density Rate

It was shown how the different sialon and ZrB2ratio in course of the spark-plasma sintering under the pressing load of 75 MPa at 1200‒1600 °C influences the phase composition, the Si3N4and Al2O3content in sialon, the microstructure and crystal phases grain size, the density rate and open porosity, the linear shrinkage and physical and mechanical properties, as well as the linear correlation between the elasticity modulus and ultimate compression strength of the mullite‒sialon‒ZrB2samples.

STUDY INTO THE INFLUENCE OF THE GRAIN STRUCTURE REFINEMENT DEGREE OF ALLOY 6063 INGOTS ON THEIR PLASTICITY, EXTRUSION PARAMETERS AND PROPERTIES OF EXTRUDED PROFILES

2018 ◽  
pp. 51-57
Author(s):  
R. S. Syryamkin ◽  
Yu. A. Gorbunov ◽  
S. B. Sidelnikov ◽  
A. Yu. Otmahova
Keyword(s):  
Mechanical Properties ◽  
Grain Size ◽  
Structure Refinement ◽  
Physical And Mechanical Properties ◽  
Optical Microscope ◽  
Hydraulic Press ◽  
Grain Structure ◽  
Test Machine ◽  
Technical Literature ◽  
Wide Range

The analysis of scientific and technical literature and practical data made it possible to found that changes in casting parameters for ingots using different mold designs allows varying the degree of ingot grain structure refinement in a sufficiently wide range, which should be reflected in the conditions of aluminum alloy profile extrusion as well as physical and mechanical properties of these profiles. Therefore, the purpose of the research was to assess the influence of the degree of grain structure refinement for Alloy 6063 ingots on extrusion deformation and speed parameters and mechanical properties of profiles produced. The study used several batches of Alloy 6063 ingots 178 mm in diameter cast under industrial conditions, as well as profiles obtained by direct extrusion on a 18 MN horizontal hydraulic press subjected to quenching and aging. The grain size in homogenized ingots was estimated by light microscopy using the Olimpus optical microscope, and mechanical properties tests were carried out using the Inspect 20 kN-1 universal test machine. It was found that the initial grain size in the ingot structure exerts a significant influence both on ingot plasticity during extrusion, and on the final structure and mechanical properties of profile products made of aluminum alloys. Having analyzed the results obtained, we can conclude that the increase in strength characteristics of products extruded from ingots with a more refined structure is due to the fact that fine grains are retained in the structure of metal after its deformation, and cast metal plasticity increases with the degree of grain structure refinement in the ingot. This leads to the higher efficiency of profile product hardening and metal outflow rate during extrusion.

The Influence of Carbon Addition on the Physical and Mechanical Properties of WC-Co Sintered Powders

2012 ◽  
Vol 59 (2) ◽  
Author(s):  
Ahmad Aswad Mahaidin ◽  
Mohd Asri Selamat ◽  
Samsiah Abdul Manaf ◽  
Talib Ria Jaafar
Keyword(s):  
Mechanical Properties ◽  
Grain Size ◽  
Powder Metallurgy ◽  
Grain Growth ◽  
Rupture Strength ◽  
Physical And Mechanical Properties ◽  
Cobalt Content ◽  
Powder Metallurgy Technique ◽  
Densification Process ◽  
Carbon Addition

The mechanical properties of WC-Co are highly dependent on its cobalt content, density and grain size of the WC particles. Addition of free carbon during the consolidation of process is said to improve the densification process and inhibit grain growth. However, there are still plenty of works needs to be done regarding this matter to support the fact. Therefore, this study is to evaluate the effect of carbon addition on the physical and mechanical properties of WC-Co-C sintered powders. The WC-Co-C sample is fabricated using powder metallurgy technique, in which the powders were uniaxially pressed at 625 MPa and cold-isostatic pressed at 200 MPa. Then, the sample is sintered in nitrogen-based atmosphere at temperature range of 1350-1450C. The physical and mechanical properties of the WC-Co sintered powders were analysed. It is found that WC-Co-C has a relatively higher density and hardness but exhibit lower transverse rupture strength compared to WC-Co.

Influence of Zirconia Content and Grain Size on Physical and Mechanical Properties of Zirconia Toughened Alumina Ceramics

2011 ◽  
Vol 143-144 ◽  
pp. 485-488 ◽  
Author(s):  
Bao Yu Du ◽  
Bo Zhao ◽  
Tie Lin Duan
Keyword(s):  
Mechanical Properties ◽  
Grain Size ◽  
Physical And Mechanical Properties ◽  
Composite Ceramic ◽  
Alumina Ceramics ◽  
Alumina Matrix ◽  
Zirconia Toughened Alumina ◽  
Better Than ◽  
Zirconia Content

Physical and mechanical properties as well as microstructure of zirconia toughened alumina ceramics with different zirconia content were tested. The results show that the best physical and mechanical properties are obtained in sub-micron composite ceramic when zirconia content is 25%; while the physical and mechanical properties of nano-zirconia toughened alumina ceramics are far better than those of sub-micron zirconia toughened alumina ceramics. Therefore physical and mechanical properties of ceramics can be improved significantly by adding proper amount of zirconia into alumina matrix and refining zirconia particles.

scholarly journals Marbles from Castagneto Carducci Area (Tuscany, Italy)

2021 ◽  
Vol 906 (1) ◽  
pp. 012122
Author(s):  
Marco Lezzerini ◽  
Jacopo Civita ◽  
Andrea Aquino ◽  
Stefano Pagnotta
Keyword(s):  
Mechanical Properties ◽  
Grain Size ◽  
Optical Microscopy ◽  
Physical And Mechanical Properties ◽  
Early Jurassic ◽  
Contact Metamorphism ◽  
Jurassic Limestone ◽  
Granoblastic Texture ◽  
Crystal Boundaries

Abstract In this work, marbles from Castagneto Carducci (Livorno province, Tuscany), which originated by contact metamorphism of the Calcare Massiccio Fm., an Early Jurassic limestone belonging to the Tuscan Sequence, were studied for determining their chemical, mineralogical and petrographic characteristics, and the main physical and mechanical properties. Forty marble samples were sampled and analysed; they are from two inactive quarries on the NW and NE slopes of the Mt. Romitorino, and from natural outcrops in the vicinity of the quarries. The analysed rocks are marbles with high calcite content (> 98% by weight). Optical microscopy observations showed Castagneto Carducci marbles generally have a heteroblastic/granoblastic texture with crystal boundaries from curved-right to lobate. The maximum grain size of the calcite crystals ranges from 0.2 mm to 0.6 mm. The determination of the main physical and mechanical properties of the analysed marbles showed that these rocks are characterised by low porosity and, in general, good physical and mechanical properties.

Sign in / Sign up

Export Citation Format

Share Document