Review of Research on Physical and Mechanical Properties and Engineering Application of Metal Tailings

Abstract Processing and storage requirements for metal residues are becoming stricter to achieve the carbon neutralization target. The physical and mechanical properties of tailings affect the stability of tailing dams. Metal tailings can be used as secondary resources, and it is easy to pollute the environment under poorly managed conditions. Therefore, it is necessary and urgent to reuse these deposits such as iron tailings, copper tailings, zinc tailings et al. This article discusses the current research on the mechanical properties of metal tailings and its engineering application. Based on previous research, it is pointed out that there still needs more attention on the mechanical properties of metal tailing sands, especially under different conditions like dry-wet, freeze-thaw, dynamic loads and large-scale application. In the future, research on the filling of metal tailings as roadbed and new building materials will be one of the directions to solve the problem of tailing pond accumulation.

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Study of the Effect of Plastic Waste Fibers Incorporation on the Behavior of Self Compacting Concrete

Annales de Chimie Science des Matériaux ◽

10.18280/acsm.450508 ◽

2021 ◽

Vol 45 (5) ◽

pp. 417-421

Author(s):

Laid Baali ◽

Larbi Belagraa ◽

Mohamed Aziz Chikouche ◽

Leila Zeghichi

Keyword(s):

Mechanical Properties ◽

Building Materials ◽

Physical And Mechanical Properties ◽

Plastic Waste ◽

Ductile Material ◽

Cement Matrix ◽

Self Compacting Concrete ◽

Mechanical Responses ◽

Hard State ◽

The Stability

The use of waste and by-products has been for many decades for the manufacturing of building materials such as concrete and mortars. That responds simultaneously to reasons of economy of natural resources in aggregates (C&D waste) and the possibility of recovering industrial waste additions as replacement in composites. The present study focuses on the use of plastic waste fibers embedded in the cement matrix of self-compacting concrete SCC to improve its properties, either rheological mainly, the stability at fresh state or mechanical responses such as compressive and tensile strengths at hard state. This incorporation of plastic fiber reinforcement on the structure matrix could result an alternative SCC composite as a ductile material with enhanced properties. In this context, the self-compacting composites by adding a variable percentage of plastic fibers at 0.5, 1, 1.5% is formulated. Hence, the effect of plastic fibers waste on the rheological and mechanical properties of SCC is assessed. The obtained results in the present study let us to conclude the beneficial effect of such inclusion of plastic fibers on this new confected SCC fiber composition with acceptable rheological, physical and mechanical properties compared to those of a normal SCC concrete.

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Physical and mechanical properties of the surface of pine wood modified with an organomineral composition

Journal of Physics Conference Series ◽

10.1088/1742-6596/2124/1/012019 ◽

2021 ◽

Vol 2124 (1) ◽

pp. 012019

Author(s):

A O Belyaev ◽

V E Danilov ◽

M V Morozova

Keyword(s):

Mechanical Properties ◽

Building Materials ◽

Treated Wood ◽

Untreated Wood ◽

Physical And Mechanical Properties ◽

Atmospheric Conditions ◽

Color Coordinates ◽

Protective Composition ◽

The Stability ◽

Technical Measures

Abstract The percentage of wooden buildings damaged or even lost due to the lack or insufficient technical measures for their preservation is growing every year. This fact makes it mandatory to treat the surface of wood building materials with protective and decorative agents. Within the framework of this study, a multifunctional protective composition for wood was developed that can increase its physical and mechanical properties. Modification of the wood surface with organomineral compositions leads to an increase in its density, hardness and strength. The hardness of the treated wood is 24% higher and the compressive strength along the fiber is 20% higher than that of untreated wood. After treatment, the surface of the wood darkened and slightly yellowed, which does not prevent its use in the construction and reconstruction of buildings. The results of measuring the color coordinates of the surface of the modified samples indicate the stability and durability of the developed protective coating even after 4 months of exposure to atmospheric conditions. Judging by the slight return of the color coordinates of the treated wood back to values of the original wood, it can be concluded that the composition is partially washed out.

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Morphology, Stability, and Application of Lycopene Microcapsules Produced by Complex Coacervation

Journal of Chemistry ◽

10.1155/2013/982603 ◽

2013 ◽

Vol 2013 ◽

pp. 1-7 ◽

Cited By ~ 23

Author(s):

Glaucia A. Rocha-Selmi ◽

Carmen S. Favaro-Trindade ◽

Carlos R. F. Grosso

Keyword(s):

Encapsulation Efficiency ◽

Gum Arabic ◽

Average Diameter ◽

Stability Test ◽

Free Form ◽

Complex Coacervation ◽

The Stability ◽

Processing And Storage ◽

High Degree ◽

And Storage

The interest in lycopene has increased in recent years due to studies that associate it with the reduction in risk of developing cardiovascular diseases and cancer. However, due to its high degree of unsaturation, this carotenoid is inclined to isomerize and oxidize during processing and storage, making it difficult to use in the food industry. Microencapsulation can improve this situation, increasing its stability and making incorporation into food formulations possible. Thus, the aim of this study was to microencapsulate lycopene by complex coacervation using gelatin and gum Arabic as the encapsulating agents. The microcapsules were evaluated based on the encapsulation efficiency and their morphology and then submitted to a stability test and applied in cake making. Most of the systems studied presented spherical microcapsules with defined walls. The encapsulation efficiency values were above 90%, and the average diameter of the capsules ranged from 61 to 144 μm. The stability test showed that microencapsulation offered greater protection to the lycopene as compared to its free form. The application of nonfreeze dried coacervated microcapsules in cake making was satisfactory, but the color transference was low when freezedried coacervated microcapsules were used.

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Study of the Effect of PP and LDPE Thermoplastic Binder Addition on the Mechanical Properties and Physical Properties of Particulate Composites for Building Material Application

Materials Science Forum ◽

10.4028/www.scientific.net/msf.964.115 ◽

2019 ◽

Vol 964 ◽

pp. 115-123

Author(s):

Sigit Tri Wicaksono ◽

Hosta Ardhyananta ◽

Amaliya Rasyida ◽

Feisha Fadila Rifki

Keyword(s):

Mechanical Properties ◽

Compression Strength ◽

Building Materials ◽

Construction Material ◽

Construction Materials ◽

Physical And Mechanical Properties ◽

Waste Recycling ◽

Plastic Waste ◽

Particulate Composites ◽

Water Absorbability

Plastic waste is majority an organic material that cannot easily decomposed by bacteria, so it needs to be recycled. One of the utilization of plastic waste recycling is become a mixture in the manufacture of building materials such as concrete, paving block, tiles, roof. This experiment purpose to find out the effect of addition of variation of LDPE and PP thermoplastic binder to physical and mechanical properties of LDPE/PP/Sand composite for construction material application. In this experiment are using many tests, such are SEM, FTIR, compression strength, density, water absorbability, and hardness. the result after the test are the best composition of composite PP/LDPE/sand is 70/0/30 because its have compression strength 14,2 MPa, while density value was 1.30 g/cm3, for the water absorbability is 0.073%, and for the highest hardness is 62.3 hardness of shore D. From the results obtained, composite material can be classified into construction materials for mortar application S type with average compression strength is 12.4 MPa.

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Physical and Mechanical Properties of Cemented Ash-Based Lightweight Building Materials with and without Pumice

Advances in Materials Science and Engineering ◽

10.1155/2018/9368787 ◽

2018 ◽

Vol 2018 ◽

pp. 1-12 ◽

Cited By ~ 1

Author(s):

Neslihan Doğan-Sağlamtimur ◽

Adnan Güven ◽

Ahmet Bilgil

Keyword(s):

Mechanical Properties ◽

Compressive Strength ◽

Building Material ◽

Building Materials ◽

Physical And Mechanical Properties ◽

Mixing Ratio ◽

Lightweight Material ◽

Important Input ◽

Axial Compressive Strength ◽

International Companies

Pumice, cements (CEM I- and CEM II-type), waste fly and bottom ashes (IFA, GBA, and BBA) supplied from international companies were used to produce lightweight building materials, and physical-mechanical properties of these materials were determined. Axial compressive strength (ACS) values were found above the standards of 4 and 8 MPa (Bims Concrete (BC) 40 and 80 kgf/cm2 class) for cemented (CEM I) pumice-based samples. On the contrary, the ACS values of the pumice-based cemented (CEM II) samples could not be reached to these standards. Best ACS results (compatible with BC80) from these cemented lightweight material samples produced with the ashes were found in 50% mixing ratio as 10.6, 13.2, and 20.5 MPa for BBA + CEM I, GBA + CEM II, and IFA + CEM I, respectively, and produced with pumice were found as 8.4 MPa (same value) for GBA + pumice + CEM II (in 25% mixing ratio), BBA + pumice + CEM I (in 100% mixing ratio), and pumice + IFA + CEM I (in 100% mixing ratio), respectively. According to the results, cemented ash-based lightweight building material produced with and without pumice could widely be used for constructive purposes. As a result of this study, an important input to the ecosystem has been provided using waste ashes, whose storage constitutes a problem.

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METHOD OF CALCULATION THE STABILITY OF AN EXCAVATOR EQUIPPED WITH A CONE ROLLER

Spravochnik Inzhenernyi zhurnal ◽

10.14489/hb.2021.09.pp.012-016 ◽

2021 ◽

pp. 12-16

Author(s):

K. Z. Tilloev ◽

S. V. Kondakov

Keyword(s):

Mechanical Properties ◽

Calculation Method ◽

Physical And Mechanical Properties ◽

Maximum Force ◽

Compacted Soil ◽

Method Of Calculation ◽

Support Roller ◽

The Stability

The construction and method of calculating the stability of a crawler excavator equipped with a new working body (cone roller) are considered. The calculation is made on two working positions (longitudinal and transverse) of the excavator, provided that the excavator must apply the maximum force on the working body at an angle of 90°. The force applied by the excavator boom to the cone roller during the introduction depends on the physical and mechanical properties of the compacted soil. The calculation method differs in that during the compaction of the roadbed, the cone sinks into the ground, and the excavator tends to roll in the direction of the rear track support roller, in contrast to the traditional danger of tipping over the front support roller when working with a bucket.

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Cellulose Fibres as a Reinforcing Element in Building Materials

Proccedings of 10th International Conference "Environmental Engineering" ◽

10.3846/enviro.2017.104 ◽

2017 ◽

Author(s):

Viola Hospodarova ◽

Nadezda Stevulova ◽

Vojtech Vaclavik ◽

Tomas Dvorsky ◽

Jaroslav Briancin

Keyword(s):

Mechanical Properties ◽

Thermal Conductivity ◽

Compressive Strength ◽

Building Materials ◽

Reference Sample ◽

Physical And Mechanical Properties ◽

Natural Fibre ◽

Cement Composites ◽

Cellulose Fibres ◽

Cellulosic Fibres

Nowadays, construction sector is focusing in developing sustainable, green and eco-friendly building materials. Natural fibre is growingly being used in composite materials. This paper provides utilization of cellulose fibres as reinforcing agent into cement composites/plasters. Provided cellulosic fibres coming from various sources as bleached wood pulp and recycled waste paper fibres. Differences between cellulosic fibres are given by their physical characterization, chemical composition and SEM micrographs. Physical and mechanical properties of fibre-cement composites with fibre contents 0.2; 0.3and 0.5% by weight of filler and binder were investigated. Reference sample without fibres was also produced. The aim of this work is to investigate the effects of cellulose fibres on the final properties (density, water absorbability, coefficient of thermal conductivity and compressive strength) of the fibrecement plasters after 28 days of hardening. Testing of plasters with varying amount of cellulose fibres (0.2, 0.3 and 0.5 wt. %) has shown that the resulting physical and mechanical properties depend on the amount, the nature and structure of the used fibres. Linear dependences of compressive strength and thermal conductivity on density for plasters with cellulosic fibres adding were observed.

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Defect Characteristics and Online Detection Techniques During Manufacturing of FRPs Using Automated Fiber Placement: A Review

Polymers ◽

10.3390/polym12061337 ◽

2020 ◽

Vol 12 (6) ◽

pp. 1337 ◽

Cited By ~ 2

Author(s):

Shouzheng Sun ◽

Zhenyu Han ◽

Hongya Fu ◽

Hongyu Jin ◽

Jaspreet Singh Dhupia ◽

...

Keyword(s):

Mechanical Properties ◽

Large Scale ◽

Variable Stiffness ◽

Future Research ◽

Online Detection ◽

Manufacturing Defects ◽

Manufacturing Method ◽

Detection Techniques ◽

Fiber Placement ◽

Automated Fiber Placement

Automated fiber placement (AFP) is an advanced manufacturing method for composites, which is especially suitable for large-scale composite components. However, some manufacturing defects inevitably appear in the AFP process, which can affect the mechanical properties of composites. This work aims to investigate the recent works on manufacturing defects and their online detection techniques during the AFP process. The main content focuses on the position defect in conventional and variable stiffness laminates, the relationship between the defects and the mechanical properties, defect control methods, the modeling method for a void defect, and online detection techniques. Following that, the contributions and limitations of the current studies are discussed. Finally, the prospects of future research concerning theoretical and practical engineering applications are pointed out.

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Influence of 6PPD Stabilizer on Climatic Stability of Rubbers Based on Butadiene-Nitrile and Epichlorohydrin Rubbers

Materials Science Forum ◽

10.4028/www.scientific.net/msf.945.433 ◽

2019 ◽

Vol 945 ◽

pp. 433-437

Author(s):

M.D. Sokolova ◽

A.F. Fedorova ◽

M.L. Davydova

Keyword(s):

Mechanical Properties ◽

Physical And Mechanical Properties ◽

Hydraulic Fluids ◽

Open Ground ◽

The Republic ◽

The Stability ◽

Property Changes ◽

Full Scale Tests ◽

Butadiene Nitrile Rubber ◽

Hydrocarbon Media

The present paper outlines the results of full-scale tests of climatic stability and the study of resistance to the action of hydrocarbon media of rubbers based on BNKS-18-18 (butadiene-nitrile rubber) and Hydrin T6000 epichlorohydrin rubber containing one of 6PPDstabilizerwith an aromatic amine moiety widely used in synthetic rubbers. Samples are exposed in an open ground under natural conditions of exposure to climatic external factors of Yakutsk in the Republic of Sakha (Yakutia), as well as in the oil environment of Talakanskoye field and I-50A hydraulic fluid in an unheated room. Such indexes of the samples as conditional tensile strength, elongation at rupture, hardness and degree of swelling are measured to determine the resistance of rubbers to aging after the first, third, and sixth months of exposing. The results of the study reveal the contribution of 6PPD stabilizer in maintaining the stability of the physical and mechanical properties of BNKS-18: rubber containing 6PPD has less property changes both in the open air and in hydrocarbon media compared to rubber without a stabilizer. It should be noted that the oil environment is the most aggressive environment, the swelling of rubbers in oil leads to a significant reduction in strength due to a decrease in intermolecular interaction.6PPD stabilizer occurred less effective for the rubber based on Hydrin T6000: changes in properties of the samples containing the stabilizer are larger than those of the samples without the stabilizer. However, unlike BNKS-18-18-based rubber, the swelling of rubber based on Hydrin T6000 led to the greatest stability of the physical and mechanical properties in the oil environment compared to the open air and hydraulic fluids.

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