Analysis of the Structure of Cellulose Fibers Using the Imagej Program and Fibercement Properties on their Basis

2020 ◽  
Vol 992 ◽  
pp. 259-264
Author(s):  
A.E. Mestnikov ◽  
V.I. Fedorov
Keyword(s):  
Experimental Study ◽  
Visual Analysis ◽  
Cellulose Fiber ◽  
High Strength ◽  
Cellulose Fibers ◽  
Morphometric Parameters ◽  
Waste Paper ◽  
Cement Stone ◽  
Recycled Paper ◽  
Cellulosic Fibers

This article presents the results of an experimental study of the effect of morphometric parameters of secondary cellulose fiber from various brands of waste paper on the strength characteristics of cement stone. The article is based on the results of determining the morphometric parameters of cellulose fibers. Visual analysis of microphotographs of cellulosic fibers showed that the smallest fractions of fibers were obtained from newspaper waste paper of grade MS-8V. A causal relationship has been established between the fiber content and the strength of an incident stone. It was found that samples with a content of cellulose fibers of 0.5-0.75% of the mass of cement have high strength. The most durable were samples with the addition of cellulosic fibers based on newspaper recycled paper MS-8V.

Physico-Mechanical Properties of Cellulose Fiber-Cement Mortars

2020 ◽  
Vol 838 ◽  
pp. 31-38
Author(s):  
Nadežda Števulová ◽  
Viola Hospodarova ◽  
Vojtěch Václavík ◽  
Tomáš Dvorský
Keyword(s):  
Flexural Strength ◽  
Cellulose Fiber ◽  
Concrete Block ◽  
Cellulose Fibers ◽  
Wood Pulp ◽  
Waste Paper ◽  
Cement Mortars ◽  
Granulated Slag ◽  
Sand Filler ◽  
Ground Limestone

This paper is aimed to investigate the total sand filler replacement by two types of cellulosic fibers (bleached wood pulp - WP and recycled fibers from waste paper - RF) in cement-based mortars. Two different types of cement mortar, one with addition of finely ground limestone and other with powdered granulated slag, were mixed with fibers. The changes in consistency of fresh fiber cement mortars and development of compressive and flexural strength of mortars in dependence on hardening time up to 90 days was studied. The development of compressive and flexural strength with increasing hardening time of cellulose fiber mortars and two binders with different properties confirmed that binder mixtures containing finely ground slag and recycled cellulose fibers achieved higher values of these strength parameters. Also adhesion testing of fiber cement mortars on two substrates (ceramic fitting and aerated concrete block) after 28 days of their application showed better adhesion of cement mortars with finely ground granulated slag on the ceramic fitting surface compared to the mortars containing finely ground limestone. However, any cracks have occurred on both substrates during the maturing of mortars with slag. Based on the above facts, it can be concluded that suitable plaster mixtures for their use in the interior appear the cement recipes with both cellulose fibers (wood pulp and fibers from recycled waste paper) and with finely ground limestone.

scholarly journals INVESTIGATION OF THE DENSITY OF A FIBROUS CELLULOSE MATRIX FOR A HEAT-INSULATING POLYMER COMPOSITE MATERIAL AT LOW PRESSING PRESSURES

2021 ◽  
pp. 118-125
Author(s):  
Д.В. Чащилов ◽  
Л.А. Злочевский ◽  
А.Е. Струкова ◽  
И.Н. Павлов
Keyword(s):  
Experimental Study ◽  
Bulk Density ◽  
Polymer Composite ◽  
Experimental Studies ◽  
Cellulose Fiber ◽  
Cellulose Fibers ◽  
Polymer Composite Material ◽  
Pressing Pressure ◽  
Second Stage ◽  
Coniferous Wood

Для теплоизоляционных полимерных композиционных материалов (ПКМ) с наполнителем из целлюлозных волокон одним из актуальных вопросов является изменение плотности волокнистой матрицы под действием внешних механических нагрузок. Предметом экспериментального исследования явились образцы разрыхленной небелёной древесной сульфитной целлюлозы из хвойной древесины в воздушно-сухом состоянии. Цель исследования – оценка изменения насыпной плотности разрыхленной целлюлозы от величины давления прессования при малых давлениях прессования. В экспериментальных исследованиях использован метод денсиметрии. Из целлюлозной папки в лабораторных условиях получены образцы разрыхленной целлюлозы путём механического разволокнения. Использован лабораторный колковый рыхлитель роторного действия. Разрыхление проведено при окружной скорости ротора 50 м/с. Давление прессования варьировалось от 0 до 7,5 кПа. Получены образцы разрыхленноё целлюлозы с насыпной плотностью от 11,1 до 100,0 кг/м3. Эксперименты проведены с трёхкратным повторением. Показано, что при увеличении давления прессования насыпная плотность целлюлозы стабильно возрастает. В исследованном диапазоне давлений прессования уплотнение целлюлозы проходит в два этапа. На первом этапе при давлении прессования от 0 до 5 кПа насыпная плотность возрастает от 11,1 до 87,5 кг/м3. На втором этапе, при давлении прессования свыше 5 кПа, насыпная плотность возрастает с 87,5 до 100 кг/м3. На втором этапе замедление нарастания насыпной плотности при росте давления прессования может быть обусловлено деформацией элементарных волокон целлюлозы. Результаты экспериментального исследования могут быть применены для создания теплоизоляционных ПКМ на основе целлюлозных волокон. For heat-insulating polymer composite materials (PCM) with a cellulose fiber filler, one of the topical issues is the change in the density of the fiber matrix under the influence of external mechanical loads. The subject of the experimental study was samples of loosened unbleached wood sulfite cellulose from coniferous wood in an air-dry state. The aim of the study is to assess the change in the bulk density of loosened pulp from the value of the pressing pressure at low pressing pressures. In experimental studies, the method of densimetry was used. Samples of loosened cellulose were obtained from the pulp folder under laboratory conditions by mechanical de-fibration. A laboratory rotary chopper was used. Loosening was carried out at a circumferential rotor speed of 50 m / s. The pressing pressure varied from 0 to 7.5 kPa. Samples of loosened cellulose with a bulk density from 11.1 to 100.0 kg/m3were obtained. The experiments were carried out in three-fold repetition. It is shown that with an increase in the pressing pressure, the bulk density of cellulose steadily increases. In the studied range of pressing pressures, the pulp compaction takes place in two stages. At the first stage, at a pressing pressure of 0 to 5 kPa, the bulk density increases from the initial value 11.1 to 87.5 kg / m3. At the second stage, when the pressing pressure exceeds 5 kPa, the bulk density increases from 87.5 to 100 kg/ m3. At the second stage, the slowdown in the increase in bulk density with an increase in the pressing pressure can be caused by the deformation of the elementary cellulose fibers. The results of the experimental study can be used to create heat-insulating PCM based on cellulose fibers.

scholarly journals Tests of Fiber Cement Materials Containing Recycled Cellulose Fibers

Materials ◽  
2020 ◽  
Vol 13 (12) ◽  
pp. 2758
Author(s):  
Tomasz Gorzelańczyk ◽  
Krzysztof Schabowicz ◽  
Mateusz Szymków
Keyword(s):  
Neural Networks ◽  
Acoustic Emission ◽  
Artificial Neural Networks ◽  
Cellulose Fiber ◽  
Cellulose Fibers ◽  
Fiber Content ◽  
Waste Paper ◽  
Three Point Bending ◽  
Recycled Waste ◽  
Recycled Waste Paper

This paper presents the results of investigations into the effect of the use of recycled waste paper cellulose fibers on the properties of fiber cement boards subjected to contamination by moisture. Four series of fiber cement boards were tested. A reference fiber cement board manufactured without the use of recycled cellulose fibers constituted as one of the series. The other three series consisted of boards differing in their recycled cellulose fiber content-ranging from 10% to 50% of the total cellulose fiber content. Specimens of the fiber cement boards were subjected to contamination by moisture by storing them in water for 1–96 h. Subsequently, their basic physical and mechanical parameters, i.e., mass moisture content, absorbability, and modulus of rupture (MOR), were tested. Then, the specimens were investigated by means of acoustic emission during three-point bending. Artificial neural networks were employed to analyze the acoustic emission test results. The tests clearly showed the amount of recycled waste paper cellulose fibers and the length of storage in water to have an adverse effect on the boards, contributing to their degradation. This was reflected in the decrease of the acoustic emission (AE) events count recognized by the artificial neural networks, accompanying the rupture of fibers during the three-point bending of the specimens. In order to gain a more detailed insight into the changes taking place in the structure of the tested fiber cement boards, optical examinations were carried out by means of a scanning electron microscope. Interesting findings crucial for building practice were noted.

Deinking of recycled paper by coupling of the enzyme endo-β-1,4-D-glucanasa and the cellulose, and by using a laboratory flotation column

MRS Advances ◽  
2020 ◽  
Vol 5 (52-53) ◽  
pp. 2669-2678
Author(s):  
Jeovani González P. ◽  
Ramiro Escudero G
Keyword(s):  
Amino Acids ◽  
Sodium Hydroxide ◽  
Paper Industry ◽  
Computational Simulation ◽  
Cellulose Fibers ◽  
Residual Water ◽  
Chemical Reagent ◽  
Recycled Paper ◽  
Flotation Column ◽  
Hydrolysis Of

AbstractDeinking of recycled office (MOW) paper was carried out by using a flotation column and adding separately sodium hydroxide, and the enzyme Cellulase Thricodema Sp., as defibrillators.The de-inked cellulose fibers were characterized according to the standards of the paper industry, to compare the efficiency of the deinking of each chemical reagent used to hydrolyze the fibers and defibrillate them.The computational simulation of the molecular coupling between the enzyme and cellulose was performed, to establish the enzyme-cellulose molecular complex and then to identify the principal amino-acids of endo-β-1,4-D-glucanase in this molecular link, which are responsible for the hydrolysis of the cellulose.Experimental results show the feasibility to replace sodium hydroxide with the enzyme Cellulase Thricodema Sp., by obtaining deinked cellulose with similar optical and physical properties.The use of the enzyme instead of sodium hydroxide avoids the contamination of the residual water; in addition to that, the column is operated more easily, taking into consideration that the pH of the system goes from alkaline to neutral.

scholarly journals Fabrication and Application of SERS-Active Cellulose Fibers Regenerated from Waste Resource

Polymers ◽  
2021 ◽  
Vol 13 (13) ◽  
pp. 2142
Author(s):  
Shengjun Wang ◽  
Jiaqi Guo ◽  
Yibo Ma ◽  
Alan X. Wang ◽  
Xianming Kong ◽  
...  
Keyword(s):  
Au Nanoparticles ◽  
Cellulose Fiber ◽  
Cellulose Fibers ◽  
Regenerated Cellulose ◽  
Sers Substrate ◽  
Au Nps ◽  
Convenient Approach ◽  
Theoretical Simulations ◽  
Difference Time ◽  
Raman Probe

The flexible SERS substrate were prepared base on regenerated cellulose fibers, in which the Au nanoparticles were controllably assembled on fiber through electrostatic interaction. The cellulose fiber was regenerated from waste paper through the dry-jet wet spinning method, an eco-friendly and convenient approach by using ionic liquid. The Au NPs could be controllably distributed on the surface of fiber by adjusting the conditions during the process of assembling. Finite-difference time-domain theoretical simulations verified the intense local electromagnetic fields of plasmonic composites. The flexible SERS fibers show excellent SERS sensitivity and adsorption capability. A typical Raman probe molecule, 4-Mercaptobenzoicacid (4-MBA), was used to verify the SERS cellulose fibers, the sensitivity could achieve to 10−9 M. The flexible SERS fibers were successfully used for identifying dimetridazole (DMZ) from aqueous solution. Furthermore, the flexible SERS fibers were used for detecting DMZ from the surface of fish by simply swabbing process. It is clear that the fabricated plasmonic composite can be applied for the identifying toxins and chemicals.

scholarly journals Experimental Study and Modeling of the Fatigue Fracture of High-Strength FeMnSi-based Shape Memory Alloy

2020 ◽  
Vol 28 ◽  
pp. 2110-2117
Author(s):  
Fedor S. Belyaev ◽  
Margarita E. Evard ◽  
Eugeny S. Ostropiko ◽  
Aleksandr E. Volkov
Keyword(s):  
Experimental Study ◽  
Shape Memory Alloy ◽  
Shape Memory ◽  
Fatigue Fracture ◽  
High Strength

scholarly journals Experimental Study on the Torsional Behaviour of Prestressed HSC Hollow Beams

2020 ◽  
Vol 10 (2) ◽  
pp. 642 ◽  
Author(s):  
Luís Bernardo ◽  
Sérgio Lopes ◽  
Mafalda Teixeira
Keyword(s):  
Experimental Study ◽  
High Strength Concrete ◽  
Concrete Beams ◽  
Concrete Strength ◽  
High Strength ◽  
Experimental Program ◽  
Pure Torsion ◽  
Strength Concrete ◽  
Hollow Beams

This article describes an experimental program developed to study the influence of longitudinal prestress on the behaviour of high-strength concrete hollow beams under pure torsion. The pre-cracking, the post-cracking and the ultimate behaviour are analysed. Three tests were carried out on large hollow high-strength concrete beams with similar concrete strength. The variable studied was the level of longitudinal uniform prestress. Some important conclusions on different aspects of the beams’ behaviour are presented. These conclusions, considered important for the design of box bridges, include the influence of the level of prestress in the cracking and ultimate behaviour.

Research on Mechanical Properties of Several New Regenerated Cellulose Fibers

2011 ◽  
Vol 332-334 ◽  
pp. 489-495 ◽  
Author(s):  
Rong Zhou ◽  
Ming Xia Yang
Keyword(s):  
Mechanical Properties ◽  
Phase Change Materials ◽  
Cellulose Fiber ◽  
Cellulose Fibers ◽  
Regenerated Cellulose ◽  
Pulp Fiber ◽  
Pulp Fibers ◽  
Bast Fiber ◽  
Bamboo Pulp ◽  
Lyocell Fiber

Regenerated cellulose fiber is the most widely-used and most variety of cellulose fiber. Five categories and ten kinds of fibers such as lyocell fiber, modal fiber, bamboo pulp fiber, sheng-bast fiber, Outlast viscose fiber were chosen as the research object. The strength property and elasticity of fibers in dry and wet state were tested and analysis. The comprehensive performances of fabrics were studied and mechanical properties of the fibers were listed in the order from good to bad by grey clustering analysis. The results show lyocell G100 and lyocell LF have better comprehensive mechanical properties ,while other new regenerated cellulose fibers’ comprehensive mechanical properties are general. Among these fibers modal fiber’s comprehensive mechanical properties are slightly better than sheng-bast fibers’ and bamboo pulp fibers’. Modal fiber, sheng-bast fiber and Bamboo pulp fiber have no significantly poor single parameter and all of them have better comprehensive mechanical properties than various viscose fibers. Outlast viscose in which has been added phase change materials sensitive to temperature by Microcapsule techniques fundamentally keeps similar comprehensive mechanical properties with other regenerated cellulose fibers,but its properties decline slightly .

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