scholarly journals Nanocellulose from fractionated sulfite wood pulp

Cellulose ◽  
2020 ◽  
Vol 27 (16) ◽  
pp. 9325-9336
Author(s):  
Armin Winter ◽  
Benjamin Arminger ◽  
Stefan Veigel ◽  
Claudia Gusenbauer ◽  
Wolfgang Fischer ◽  
...  
Keyword(s):  
Production Process ◽  
Modulus Of Elasticity ◽  
Mechanical Performance ◽  
Wood Pulp ◽  
High Modulus ◽  
Paper Properties ◽  
Aqueous Suspensions ◽  
Reduced Viscosity ◽  
Fine Fibre ◽  
Sulfite Pulp

AbstractFine fibre fractions in wood pulp may contribute to advantageous paper properties, but in some instances their removal from pulp may be beneficial to the production process of certain paper grades. In order to study the suitability of fine fibre fractions for the production of nanocellulose as an alternative use option, sulfite pulp was fractionated and homogenised, and cellulose nanopapers were produced. Characterisation revealed that fine fibre fractions were more easily homogenised than long fibres. Aqueous suspensions of nanocellulose produced from fines showed remarkably reduced viscosity compared to nanocellulose derived from long fibres. Nanopapers produced from all nanocellulose variants showed roughly similar mechanical performance. Only nanopaper produced from primary fines-derived nanocellulose deviated in that it showed a comparably high modulus of elasticity at a low strain at failure. Overall, fine fibre fractions separated from wood pulp were found to be highly suitable for nanocellulose production.

WIELAND DURO TUNGSTEN

Alloy Digest ◽  
2020 ◽  
Vol 69 (10) ◽  
Keyword(s):  
Melting Point ◽  
Physical Properties ◽  
Tensile Properties ◽  
Modulus Of Elasticity ◽  
Radiation Shielding ◽  
High Melting ◽  
High Modulus ◽  
High Melting Point ◽  
Structural Applications ◽  
Very High

Abstract Wieland Duro Tungsten is unalloyed tungsten produced from pressed-and-sintered billets. The high melting point of tungsten makes it an obvious choice for structural applications exposed to very high temperatures. Tungsten is used at lower temperatures for applications that can benefit from its high density, high modulus of elasticity, or radiation shielding capability. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties. It also includes information on machining. Filing Code: W-34. Producer or source: Wieland Duro GmbH.

scholarly journals Concreting method that produce high modulus of elasticity

2014 ◽  
Vol 11 ◽  
pp. 03012 ◽  
Author(s):  
H.S. Abdelgader ◽  
A.S. Elbaden
Keyword(s):  
Modulus Of Elasticity ◽  
High Modulus

THE MECHANISMS OF REINFORCEMENT OF NANOCOMPOSITES POLYURETHANE/CARBON NANOTUBE

2020 ◽  
pp. 3-7
Keyword(s):  
Carbon Nanotube ◽  
Polymer Nanocomposites ◽  
Modulus Of Elasticity ◽  
Maximum Degree ◽  
Micromechanical Model ◽  
Strong Interactions ◽  
High Modulus ◽  
Nanocomposite Structure ◽  
Practical Conclusion ◽  
Degree Of Reinforcement

The aim of present work is theoretical analysis of high values of reinforcement degree of nanocomposites polyurethane/carbon nanotube. For this two micromechanical models were used, showing identical results. The indicated models demonstrated, that densely-packed high-modulus interfacial regions, which serve the same reinforcing element of nanocomposite structure, as and nanofiller (carbon nanotubes) actually. The formation of interfacial regions defines by strong interactions polymer matrix – nanofiller. This means that nanofiller efficiency is controlled by its ability to generate densely-packed interfacial regions. It is important also to point out, that any micromechanical model, including mixtures rule, describes correctly modulus of elasticity of polymer nanocomposites, if in it real, but not nominal, characteristics of nanofiller were used. The content of interfacial regions in nanocomposite is controlled by structure of nanofiller. This allows to obtain important practical conclusion – for realization maximum degree of reinforcement it is necessary to cause structure of nanofiller, allowing to generate greatest content of interfacial regions. Absence of interfacial regions results to reduction of modulus of elasticity of nanocomposite in comparison with matrix polymer.

Theoretical calculation of the reduced viscosity of aqueous suspensions of charged spherical particles

2004 ◽  
Vol 42 (6) ◽  
pp. 1068-1074 ◽  
Author(s):  
Koji Nishida ◽  
Kohei Kiriyama ◽  
Toshiji Kanaya ◽  
Keisuke Kaji ◽  
Tsuneo Okubo
Keyword(s):  
Theoretical Calculation ◽  
Spherical Particles ◽  
Aqueous Suspensions ◽  
Reduced Viscosity

scholarly journals Using the Rheological Index to Quantitatively Evaluate the Mechanical Performance of High-Elasticity Modified Asphalt

2021 ◽  
Vol 2021 ◽  
pp. 1-8
Author(s):  
Jiani Wang ◽  
Zhongjun Xue ◽  
Meng Guo ◽  
Shuaixiang Zhang
Keyword(s):  
Modulus Of Elasticity ◽  
Recovery Rate ◽  
Bridge Deck ◽  
Mechanical Performance ◽  
Elastic Recovery ◽  
High Temperature Deformation ◽  
Temperature Deformation ◽  
Modified Asphalt ◽  
Recovery Capacity ◽  
High Elasticity

High-elasticity modified asphalt is widely used in OGFC and bridge deck paving due to its high viscosity and strong displacement recovery capacity. It can improve the high-temperature deformation resistance and elastic recovery ability of the pavement. Especially in bridge deck pavement, high-elastic modified asphalt can inhibit the formation of reflective cracks and extend the service life. In order to quantitatively evaluate properties of the high-elasticity modified asphalt, rheological properties are studied by using a dynamic shear rheometer (DSR) test. The parameters were fitted with the Burgers model, and the constitutive equation was established. The 3 s elastic recovery rate E r was proposed to quantitatively evaluate the elastic recovery of high-elasticity modified asphalt. The experimental results show that the instantaneous modulus of elasticity G 0 and the delayed modulus of elasticity G 1 can be used to evaluate the elastic capacity. E r can quantitatively evaluate the elastic resilience of high-elasticity modified asphalt. The correlation coefficient between the test results of high-elasticity modified asphalt and those of impact toughness evaluation reached 0.9966, and the 3 s elastic recovery rate E r could be used to evaluate the elastic recovery ability of high-elasticity modified asphalt.

scholarly journals Mechanical performance of wood under artificial and natural weathering treatments

BioResources ◽  
2019 ◽  
Vol 14 (3) ◽  
pp. 6267-6277
Keyword(s):  
Exposure Time ◽  
Modulus Of Elasticity ◽  
Elastic Limit ◽  
Bending Strength ◽  
Mechanical Performance ◽  
General Information ◽  
Bending Test ◽  
Natural Weathering ◽  
Linear Regression Models ◽  
Artificial Weathering

Natural and artificial weathering treatments were studied to determine the change of wood properties as a function of exposure time. This paper aimed to provide general information about the mechanical performance of wood under natural and artificial weathering treatments and define a relationship between them. The eight strength classes of ABNT NBR 7190 (1997) were considered, in addition to a paired sampling approach. The modulus of elasticity and conventional strength value in static bending, strength in compression parallel to the grain, hardness perpendicular to the grain, and the elastic limit in the static bending test were investigated. Linear regression models for mechanical performances under artificial and natural aging treatments of the exposure time were made and tested using an analysis of variance. According to the results, 360 days of natural weathering provoked a change in mechanical performance of 15.72% that included a decrease in strength and modulus of elasticity and an increase in elastic limit. Twelve hours of the artificial weathering treatment provided the effect of 6.22 days of natural weathering exposure.

scholarly journals MECHANICAL PERFORMANCE OF LIME-CEMENT MORTAR FOR STRAW-BALE CONSTRUCTION

2014 ◽  
Vol 9 (3) ◽  
pp. 100-115
Author(s):  
Colin MacDougall ◽  
Stephen Vardy
Keyword(s):  
Compressive Strength ◽  
Modulus Of Elasticity ◽  
Mechanical Performance ◽  
Failure Strain ◽  
Cement Mortar ◽  
Hydrated Lime ◽  
Empirical Equations ◽  
Curing Time ◽  
Lime Mortars ◽  
Straw Bale

Experimental data describing the mechanical performance of Portland cement- hydrated lime mortars used for straw bale construction is presented. Straw bale construction uses stacked straw bales plastered on each side to form load-bearing elements. Mortars used have slumps of approximately 50 mm, compared to slumps up to 279 mm for conventional masonry mortars. Cylinder and cube tests of a range of typical straw bale mortar mixes were carried out. The mortars had compressive strengths ranging between 0.3 MPa and 13 MPa. Empirical equations describing the relationships between compressive strength and curing time, w/cm ratio, proportions of lime, cement and sand, and modulus of elasticity are presented. The data show that cement-lime mortars for straw bale construction will have a higher modulus of elasticity and lower failure strain than a conventional mortar of equivalent compressive strength. The Modulus of Elasticity is on average 818 times the compressive strength of a straw bale mortar, compared to 100 to 200 times as reported in the literature for conventional mortar. The average failure strain for straw bale mortar is 0.00253 compared to 0.0087 to 0.0270 reported in the literature for conventional mortar.

scholarly journals Properties evaluation by thickness and type of oriented strand boards manufactured in continuous press line

BioResources ◽  
2020 ◽  
Vol 15 (3) ◽  
pp. 5829-5842
Author(s):  
Octavia Zeleniuc ◽  
Adela-Eliza Dumitrascu ◽  
Valentina Doina Ciobanu
Keyword(s):  
Modulus Of Elasticity ◽  
Internal Bond ◽  
Mechanical Performance ◽  
Modulus Of Rupture ◽  
Thickness Swelling

Oriented strand boards (OSB) are widely used in construction replacing plywood. There are four types of boards (OSB/1, OSB/2, OSB/3, OSB/4) carried out depending on the conditions of uses. The present research aimed to evaluate the physical and mechanical performance of these types of boards, with 10 mm, 11 mm, 18 mm and 22 mm thicknesses. The boards were industrially manufactured using the continue press line. The results showed that the compression grade increased with decreasing of the wood strands densities, from 1.3 (OSB/1) to 1.1 (OSB/3). Thickness swelling values were lower for OSB/3 and OSB/2 with 35% and 14%, when compared to OSB/1. For these boards a slight increase in adhesive content and a lower speed of pressing line was set considering that they are designated for the exterior use. An increase in density with about 7.6% led to an increase with about 19% of modulus of rupture (MOR), when compare OSB 10 mm with OSB 22 mm. Improvements with 27% to 22% MOR and 13% to 10% modulus of elasticity (MOE) in case of OSB/3 and OSB/2 compared to OSB/1 were found. Internal bond (IB) values were with about 32% higher for OSB/3 than those reached by OSB/1 and the thinner boards registered 25% higher IB values even after boiling test, compared to the thicker ones.

scholarly journals Investigating the Behavior of Concrete and Mortar Reinforced with Aluminum Waste Strips

2018 ◽  
Vol 7 (4.37) ◽  
pp. 211
Author(s):  
Rawa Shakir Muwashee ◽  
Hamid Athab Al-Jameel ◽  
Qusay Abdulhameed Jabai
Keyword(s):  
Tensile Strength ◽  
Compressive Strength ◽  
Flexural Strength ◽  
Modulus Of Elasticity ◽  
Fiber Reinforced Concrete ◽  
Low Density ◽  
High Modulus ◽  
Aluminum Strip ◽  
Lower Strain ◽  
Cracks Propagation

Composite  concrete such as fiber reinforced concrete is widely used in structures because of its excellent properties such as compressive, flexural and tensile strengths and also high modulus of elasticity because it gives lower strain values under loading and too fewer cracks propagation. In this study, Aluminum strips was prepared by cutting the Coca- Cola cans as strips in concrete. The reason of using Aluminum strip is low density and good tensile strength (about 310 MPa) and also has a good ductility.  The results of this study show good improvements in compressive, tensile and  flexural strengths using 117 tested specimens for both concrete and mortar. In brief, about 22 % increment in compressive strength of Aluminum strip concrete  and flexural strength increases from 3.31 MPa to 11.20 MPa when using Aluminum strips with 2.5 % by volume of concrete. The reinforced mortar with Aluminum strips demonstrates significant increments which are 27% for compressive strength and more than 100% for both flexural and tensile strengths comparing with reference mix.  

Glass fiber with a high modulus of elasticity

1962 ◽  
Vol 19 (4) ◽  
pp. 228-229
Author(s):  
R∘ Tiede
Keyword(s):  
Glass Fiber ◽  
Modulus Of Elasticity ◽  
High Modulus
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