scholarly journals Hydrogen-Bonding-Aided Fabrication of Wood Derived Cellulose Scaffold/Aramid Nanofiber into High-Performance Bulk Material

Materials ◽  
2021 ◽  
Vol 14 (18) ◽  
pp. 5444
Author(s):  
Xiaoshuai Han ◽  
Weijie Wu ◽  
Jingwen Wang ◽  
Zhiwei Tian ◽  
Shaohua Jiang
Keyword(s):  
Hydrogen Bonding ◽  
Hybrid Material ◽  
High Performance ◽  
Building Materials ◽  
Bulk Material ◽  
Physical And Mechanical Properties ◽  
High Strength ◽  
Specific Strength ◽  
Cellulose Microfibers ◽  
Natural Wood

Preparing a lightweight yet high-strength bio-based structural material with sustainability and recyclability is highly desirable in advanced applications for architecture, new energy vehicles and spacecraft. In this study, we combined cellulose scaffold and aramid nanofiber (ANF) into a high-performance bulk material. Densification of cellulose microfibers containing ANF and hydrogen bonding between cellulose microfibers and ANF played a crucial role in enhanced physical and mechanical properties of the hybrid material. The prepared material showed excellent tensile strength (341.7 MPa vs. 57.0 MPa for natural wood), toughness (4.4 MJ/m3 vs. 0.4 MJ/m3 for natural wood) and Young’s modulus (24.7 GPa vs. 7.2 GPa for natural wood). Furthermore, due to low density, this material exhibited a superior specific strength of 285 MPa·cm3·g−1, which is remarkably higher than some traditional building materials, such as concrete, alloys. In addition, the cellulose scaffold was infiltrated with ANFs, which also improved the thermal stability of the hybrid material. The facile and top-down process is effective and scalable, and also allows one to fully utilize cellulose scaffolds to fabricate all kinds of advanced bio-based materials.

CFBC Bottom Ash as Fine Active Filler for High Performance Composite Building Materials

2017 ◽  
Vol 755 ◽  
pp. 90-95 ◽  
Author(s):  
Rostislav Šulc ◽  
Petr Formáček
Keyword(s):  
High Performance ◽  
Building Materials ◽  
Circulating Fluidized Bed ◽  
Bottom Ash ◽  
Diffraction Method ◽  
Physical And Mechanical Properties ◽  
High Strength ◽  
Physical Parameters ◽  
Fluidized Bed Combustion ◽  
High Performance Composite

This article presents the results of the bottom ash from Circulating fluidized Bed Combustion (CFBC). Ashes were modified by grinding in their physical parameters. For this treatment was used the tumbling ball mill at CTU in Prague. In this case were used bottom ashes from Ledvice power plant. Samples of bottom ash were milled in specific amounts and grinding times. The modified samples were tested for the effect of amount of bottom ash in the mill and grinding time on its granulometry. For this testing was used laser diffraction method with particle size analyzer. Milling seems to be great way to get material with better physical and mechanical properties. The reason for this experiment was to better understand behaviour of bottom ash during grinding and made fine filler with specific features for composite building material with high strength.

COMPARATIVE CHARACTERISTICS OF PHYSICAL AND MECHANICAL PROPERTIES OF COMPOSITE MATERIALS AND HIGH-STRENGTH STEEL 30FGSN2A

2020 ◽  
Author(s):  
I.R. Antypes ◽  
◽  
V.V. Zaitsev ◽  
Keyword(s):  
Composite Materials ◽  
High Strength Steel ◽  
Critical Stress ◽  
Physical And Mechanical Properties ◽  
High Strength ◽  
Aviation Industry ◽  
Specific Strength ◽  
Aircraft Landing ◽  
Carbon Plastics ◽  
Aircraft Landing Gear

Currently, the use of composite materials is increasingly used in various areas of the national economy, including the aviation industry. The materials of this article are devoted to the study of the use of composite materials for the manufacture of aircraft landing gear in comparison with the traditionally used brand of steel. As a result of the work carried out, it was found that the slope made of carbon fiber showed a critical stress twice as high as its design made of 30xgsn2a steel. In addition, carbon plastics are superior to high-strength steel in terms of specific strength, stiffness, and tensile strength.

scholarly journals Concrete based on sulfur binder being modified with inorganic additives

2018 ◽  
Vol 212 ◽  
pp. 01013
Author(s):  
Vadim Balabanov ◽  
Victor Baryshok ◽  
Nikita Epishkin
Keyword(s):  
Frost Resistance ◽  
Building Materials ◽  
Physical And Mechanical Properties ◽  
High Strength ◽  
Strength Properties ◽  
Climatic Conditions ◽  
Freezing And Thawing ◽  
Concrete Mixtures ◽  
Irkutsk Region ◽  
Water Saturated

The sharply continental climate of the Irkutsk region is characterized by wide temperature intervals throughout the year. The repeated cyclicity of freezing and thawing of building materials in the water-saturated state influences the change in technical characteristics and the durability of concrete products and structures. The concrete products’ features in such climatic conditions create the need for the production of concretes with improved indicators of physical and mechanical properties. The effect of modifying additives on the technological characteristics of sulfur concrete is established. The effect of all elements of sulfur concrete on its strength and frost resistance. The composition of sulfuric concrete is obtained, which meets all the requirements and also has high strength and increased frost resistance. Formulations with a certain ratio of structural sulfuric concrete mixtures were developed. As a result of the use of technical sulfur in the composition of concrete products, the problem of utilizing annually accumulating reserves of technical sulfur is partially solved. The strength properties of sulfuric concretes easily compete with high-quality brands of concrete, special types of concretes that have in their composition additives.

The Study of Creep and Deformation Properties of Sulfur-Containing Arbolit Exposed to Various Compression Stresses

2021 ◽  
Vol 899 ◽  
pp. 137-143
Author(s):  
Yulia A. Sokolova ◽  
Marina A. Akulova ◽  
Baizak R. Isakulov ◽  
Alla G. Sokolova ◽  
Berikbay B. Kul’sharov ◽  
...  
Keyword(s):  
Stress Level ◽  
Creep Deformation ◽  
Building Materials ◽  
Physical And Mechanical Properties ◽  
High Strength ◽  
Experimental Tests ◽  
Theory And Practice ◽  
Wall Material ◽  
Deformation Properties ◽  
Sulfur Containing

The present paper considers the study of creep and deformation properties of sulfur-containing arbolit exposed to various compression stresses. Investigating the creep of lightweight arbolit concretes greatly affecting the performance of bearing and envelope structures draws a special attention during the last years. This issue is of particular relevance in the regions with hot and sharp continental climate. Arbolit concrete is one of the lightest building materials with low thermal conductivity and good soundproof properties. The modern postulates of theory and practice of creation, development of high-strength arbolit concretes on the base of composite sulfur-containing binders have become the methodological framework of the present research. While carrying out scientific research, the following standard measuring and analysis methods of physical and mechanical properties have been used for sulfur-containing arbolit composites. Experimental tests have been implemented on the 28-days samples made of sulfur-containing arbolit, with the cotton plant footstalks as an organic component. The researched samples were vapor sealed with the purpose to eliminate overlapping the processes of contraction and creep. The experimental results have shown that the analysis of prisms deformation in time demonstrates certain derivation from the pattern. Deformation of prisms made of sulfur-containing arbolit loaded at the low stress level were growing at a slower rate that the same deformations at a higher stress level. No derivation has been observed for the prisms of sulfur-containing haydite concrete. For both types of concrete, creep deformation has reached the values exceeding completely recoverable deformation by a factor of 2 or all the samples, the rapid growth of creep deformation has been observed after loading, followed by the gradual slowdown of deformation growth. For sulfur-containing lightweight concretes, as the test shown, the rate of creep deformation growth depends on the hardening curve in time reflecting the process of concrete hardening. This, if compared with sulfur-containing lightweight concretes, creep of sulfur-containing arbolit concrete is significantly lower that eventually leads to the loss of creep deformation at the same stress level. The obtained results can be used when manufacturing an efficient wall material for residential construction, including seismic areas.

scholarly journals Lightweight in Automotive Components by Forming Technology

2020 ◽  
Vol 3 (3) ◽  
pp. 195-209 ◽  
Author(s):  
Stephan Rosenthal ◽  
Fabian Maaß ◽  
Mike Kamaliev ◽  
Marlon Hahn ◽  
Soeren Gies ◽  
...  
Keyword(s):  
High Performance ◽  
Lightweight Design ◽  
Dissimilar Materials ◽  
Hot Extrusion ◽  
High Strength ◽  
Extrusion Process ◽  
Specific Strength ◽  
Metal Metal ◽  
Fiber Metal ◽  
Strength And Stiffness

AbstractLightweight design is one of the current key drivers to reduce the energy consumption of vehicles. Design methodologies for lightweight components, strategies utilizing materials with favorable specific properties and hybrid materials are used to increase the performance of parts for automotive applications. In this paper, various forming processes to produce light parts are described. Material lightweight design is discussed, covering the manufacturing processes to produce hybrid components like fiber–metal, polymer–metal and metal–metal composites, which can be used in subsequent deep drawing or combined forming processes. Approaches to increasing the specific strength and stiffness with thermomechanical forming processes as well as the in situ control of the microstructure of such components are presented. Structure lightweight design discusses possibilities to plastically form high-strength or high-performance materials like magnesium or titanium in sheet, profile and tube forming operations. To join those materials and/or dissimilar materials, new joining by forming technologies are shown. To economically produce lightweight parts with gears or functional elements, incremental sheet-bulk metal forming is presented. As an important part property, the damage evolution during the forming operations will be discussed to enable even lighter parts through a more reliable design. New methods for predicting and tailoring the mechanical properties like strength and residual stresses will be shown. The possibilities of system lightweight design with forming technologies are presented. A combination of additive manufacturing and forming to produce highly complex parts with integrated functions will be shown. The integration of functions by a hot extrusion process for the manufacturing of shape memory alloys is presented. An in-depth understanding of the newly developed processes, methodologies and effects allows for a more accurate dimensioning of components. This facilitates a reduction in the total mass and an increasing performance of vehicle components.

The Use of High Performance Textiles in Construction Projects

2002 ◽  
Vol 31 (3) ◽  
pp. 205-217 ◽  
Author(s):  
Fred Isley
Keyword(s):  
Construction Industry ◽  
Textile Industry ◽  
Construction Projects ◽  
High Performance ◽  
Building Materials ◽  
Glass Fibers ◽  
High Strength ◽  
The Past ◽  
Textile Fabrics ◽  
Construction Trades

A niche in the textile industry provides high strength, high modulus textile fabrics to the construction industry as a potential replacement for more traditional building materials such as wood, concrete, masonry, and steel. The mechanical properties of fabrics made of aramid, carbon and glass fibers lend themselves to the needs of the design engineer by providing high strength to weight, high stiffness to weight and extreme flexibility in use and design. Combined with cross-linking resins systems to form a composite, the fabrics are being widely accepted by the civil engineers serving the construction trades Thousands of structures around the world have been repaired, retrofitted or built of such fabrics in the past 10 years.

Development of Green High Performance Concrete

2013 ◽  
Vol 634-638 ◽  
pp. 2672-2675
Author(s):  
Zhen Rong Lin ◽  
Tao Zhang ◽  
Yun Yun Xu
Keyword(s):  
Mechanical Properties ◽  
High Strength Concrete ◽  
High Performance ◽  
Building Materials ◽  
High Performance Concrete ◽  
High Strength ◽  
Current Development ◽  
Green Concrete ◽  
The Past ◽  
Concrete Production

As the world's largest building materials production, the mechanical properties of concrete prominent and construction is simple, inexpensive features. Concrete production and construction sectors also exists a very serious problem of environmental pollution, people have to consider how to enhance the environmental protection of concrete, namely, the production and use of "green concrete". Since the past one-sided pursuit of high strength concrete, while ignoring the the durability issues brought a series of questions, allowing people to put forward the concept of a high-performance concrete. The paper by exploring the current development of high-performance green concrete, summary of the proposed method to achieve green high performance concrete.

Polymer Fibers in Foam Concrete Application Efficiency

2021 ◽  
Vol 1043 ◽  
pp. 55-59
Author(s):  
Vladimir Morgun ◽  
Denis Votrin ◽  
Aleksei Revyakin
Keyword(s):  
Building Materials ◽  
Physical And Mechanical Properties ◽  
High Strength ◽  
Fiber Reinforced Concrete ◽  
Polymer Fibers ◽  
Synthetic Fiber ◽  
Foam Concrete ◽  
Concrete Mixtures ◽  
Technical Effect ◽  
Moduli Of Elasticity

The urgency of improving the performance properties of concrete, as the most common building materials, is noted. The reasons for the increased demand for products made of high-strength gas-filled concrete are stated. It is shown that the current volume of polymer fibers production makes it possible to predict the possibility of their widespread use in construction. The information on the physical and mechanical properties of synthetic fiber, which is important for its successful use as dispersed reinforcement of foam concrete mixtures, is presented. The technology of manufacturing experimental samples and methods of their testing are described. It has been established that the introduction of any synthetic fiber into the foam mixture formulation improves the structural properties of foam concrete, however, the measure of efficiency depends on the ratio between the concrete moduli of elasticity and fiber. The greater the value of the elastic modulus of the fiber used, the higher the technical effect of its use in fiber-reinforced concrete for structural purposes can be.

scholarly journals Cross-Linked Chitosan as an Eco-Friendly Binder for High-Performance Wood-Based Fiberboard

2021 ◽  
Vol 2021 ◽  
pp. 1-7
Author(s):  
Erzhuo Huang ◽  
Yanwei Cao ◽  
Xinpeng Duan ◽  
Yutao Yan ◽  
Zhe Wang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Dimensional Stability ◽  
High Performance ◽  
Physical And Mechanical Properties ◽  
High Strength ◽  
Modulus Of Rupture ◽  
Wood Fibers ◽  
Promising Candidate ◽  
Pressing Method ◽  
Optimum Modulus

High-performance wood-based fiberboards with high strength and dimensional stability were fabricated by hot-pressing method using 2,5-dimethoxy-2,5-dihydrofuran (DHF) cross-linked chitosan (CS) as an eco-friendly binder. The effects of cross-linked chitosan on the mechanical properties and dimensional stability of wood-based fiberboards were investigated. It is evident that cross-linked chitosan addition was effective in improving mechanical properties and dimensional stability of wood-based fiberboards. The prepared wood-based fiberboard bonded by DHF cross-linked CS displayed optimum modulus of rupture (MOR) of 42.1 MPa, modulus of elasticity (MOE) of 3986.0 MPa, internal bonding (IB) strength of 1.4 MPa, and thickness swelling (TS) value of 16.3%. The improvement of physical and mechanical properties of wood-based fiberboards could be attributed to the amide linkages and hydrogen bonds between wood fibers and cross-linked chitosan. The high-performance wood-based fiberboards fabricated in this study may be a promising candidate for eco-friendly wood-based composites.

Determination of Physical and Mechanical Properties of Quarries Dos Bocas Mouths and Mine Copeto for High Resistance Concretes

2018 ◽  
Vol 4 (2) ◽  
pp. 33
Author(s):  
Lucia Katherine Macías Sánchez ◽  
Eduardo Humberto Ortiz Hernández ◽  
Luis Santiago Quiroz Fernández ◽  
Wilter Enrique Ruiz Párraga
Keyword(s):  
High Resistance ◽  
Bulk Material ◽  
Soil Mechanics ◽  
Physical And Mechanical Properties ◽  
High Strength ◽  
Fine Aggregate ◽  
Santo Domingo ◽  
Technical Specifications

The importance of the use, the type and the correct quality of the aggregate (aggregate) cannot be underestimated. Thin and coarse aggregates occupy about 60% to 80% of the volume of the concrete (70% to 85% of the mass) and strongly influence the properties both in the fresh and hardened state, in the proportions of the mixture and the economy of the concrete. Due to the great importance of the quality of the materials that must be used for high strength concretes, this research has been conducted to determine if the aggregates of the Dos Bocas and Copeto quarries meet the requirements outlined in the standards MOP-001 - F- 2002 for high resistance concretes. The bulk material was taken from the Dos Bocas quarry located in Puerto Cayo, Province of Manabí, and the fine aggregate was obtained from the Copeto Mine that is located in the Santo Domingo sector, Santo Domingo de los Tsáchilas Province. The tests executed in the Laboratory of Soil Mechanics, consisted in determining the quality index of the aggregate, calculating the maximum percentage of mass wear, determination of minimum and maximum percentages that pass through the standard sieves, volumetric mass, absorption and surface moisture. For a better understanding and interpretation of the results obtained from the different tests. We proceeded to graphically represent each of them for the two types of aggregates, allowing us to compare the property of each material with its respective specification, as mentioned in the Technical Specifications of the Ministry of Public Works MOP-001 - F- 2002.

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