scholarly journals Lightweight cement composites containing end-of-life treated wood – Leaching, hydration and mechanical tests

2022 ◽  
Vol 317 ◽  
pp. 125931
Author(s):  
Sara Dias ◽  
João Almeida ◽  
Bruna Santos ◽  
Pedro Humbert ◽  
António Tadeu ◽  
...  
Keyword(s):  
End Of Life ◽  
Treated Wood ◽  
Mechanical Tests ◽  
Cement Composites

Influence of Different Types of Fine Aggregate on Cement Composites Resistance to High Temperatures

2014 ◽  
Vol 1000 ◽  
pp. 126-129 ◽  
Author(s):  
Tomáš Melichar ◽  
Jiří Bydžovský
Keyword(s):  
Mineralogical Composition ◽  
Mechanical Tests ◽  
Basic Material ◽  
Fine Aggregate ◽  
Cement Composites ◽  
Cement Mortars ◽  
Different Types ◽  
Natural Aggregates ◽  
The Impact

The paper discusses the impact of several selected aggregates on the basic material characteristics of cement composites. Both artificial and natural aggregates (four types in total) with different mineralogical composition were evaluated. The specimens were exposed to environments with the temperature up to 1000°C and then subjected to physico-mechanical tests. For the follow-up development of polymer-cement mortars, we selected two types of aggregates – fly ash aggloporite (FAA) and amphibolite (AMA).

scholarly journals Nanoceramic Composites for Nuclear Radiation Attenuation

Materials ◽  
2021 ◽  
Vol 15 (1) ◽  
pp. 262
Author(s):  
Shankar A. Hallad ◽  
Nagaraj R. Banapurmath ◽  
Avinash S. Bhadrakali ◽  
Arun Y. Patil ◽  
Anand M. Hunashyal ◽  
...  
Keyword(s):  
Cross Sections ◽  
Cost Effective ◽  
Mechanical Tests ◽  
Absorption Capacity ◽  
Radiation Shielding ◽  
Nuclear Radiation ◽  
Cement Composites ◽  
Radiation Attenuation ◽  
Nano Powder ◽  
Structural Applications

The development of radiation attenuation materials with lean cross-sections is the need of the hour. However, the inherent threat of radiations accompanying these processes is of major concern. Thus, in an attempt to shield unnecessary radiations, several novel materials have been fabricated alongside the conventional materials available. Yet, there is a need for cost-effective, efficient shielding materials that have good mechanical strength and effective shielding properties. The present work investigates ceramic composite behaviors and radiation shielding capacity reinforced with lead oxide nano-powder. Developed nano-lead-based cement composites were subjected to mechanical tests to determine flexural and compressive strengths to check their suitability for structural applications. Further, the gamma attenuation test of the composites was conducted to determine their neutron absorption capacity. The addition of nano-leadoxide in the control beams was varied from 0.7 to 0.95 and 1 wt.% of the ceramic matrix. The percentage of nano-leadoxide that gives the best results in both enhanced properties and economic aspects was determined to be 0.6 wt.% of the cement.

scholarly journals CEMENT COMPOSITES REINFORCED WITH TEOS-TREATED WOOD FIBRES

2021 ◽  
Vol 55 (1-2) ◽  
pp. 141-147
Author(s):  
ALESSANDRA BUSS TESSARO ◽  
RAFAEL DE AVILA DELUCIS ◽  
SANDRO CAMPOS AMICO ◽  
DARCI ALBERTO GATTO ◽  
MARGARETE REGINA FREITAS GONÇALVES
Keyword(s):  
Mechanical Properties ◽  
Treated Wood ◽  
Cement Composite ◽  
Tetraethyl Orthosilicate ◽  
Wood Fibre ◽  
Cement Composites ◽  
Hygroscopic Properties ◽  
Wood Fibres ◽  
Fibre Cement ◽  
Fibre Cement Composite

In this study, wood fibres were extracted from eucalyptus and pine woods, treated by immersion in tetraethyl orthosilicate (TEOS) and incorporated into a cementitious matrix at three weight contents (2 wt%, 5 wt% and 10 wt%). The fibres were characterized using chemical and morphological analyses and the cement-based composites were evaluated using chemical, hygroscopic, mechanical and morphological tests. The morphological and spectroscopic results satisfactorily justified the physical-mechanical properties. The wood fibre-cement composites reached similar water uptake and apparent porosity to those of the neat mortar, but exhibited higher mechanical properties. Furthermore, all treated fibres yielded composites with improved mechanical and hygroscopic properties compared to those with pristine fibres. Overall, the best performance (based on hygroscopic and mechanical results) was obtained for the wood fibre-cement composite with 2 wt% pine fibres.

scholarly journals Waste Mineral Powders as a Components of Polymer-Cement Composites

2015 ◽  
Vol 61 (4) ◽  
pp. 199-210 ◽  
Author(s):  
B. Jaworska ◽  
J. J. Sokołowska ◽  
P. Łukowski ◽  
J. Jaworski
Keyword(s):  
Construction Industry ◽  
Building Materials ◽  
Combustion Products ◽  
Mechanical Tests ◽  
Cement Composites ◽  
Coal Combustion Products ◽  
The Sustainable Development ◽  
Preliminary Study ◽  
Burning Coal ◽  
Mineral Additives

The introduction of the sustainable development elements in the construction industry leads to finding new ways of using waste minerals that are difficult in storage and recycling. Coal combustion products have been already introduced into building materials as a part of cement or concrete but they have been thought insufficiently compatible with the polymer-cement binders [7]. The paper presents results of the mechanical properties of polymer-cement composites containing two types of mineral additives: waste perlite powder that is generated during the perlite expanding process, and calcium fly ash which is the byproduct of burning coal in conventional furnaces. Mechanical tests of polymer-cement composites modified with wastes were carried out after 28 and 90 days of curing. As a part of preliminary study specific surface area and particle size distribution of mineral wastes were determined.

Structure-property relationships of PE/PP sandwiched films

1987 ◽  
Vol 45 ◽  
pp. 454-455
Author(s):  
J. Petermann ◽  
G. Broza ◽  
U. Rieck ◽  
A. Jaballah ◽  
A. Kawaguchi
Keyword(s):  
Mechanical Tests ◽  
Polymer Materials ◽  
Ionic Crystals ◽  
Structure Property ◽  
Polymer Systems ◽  
Structure Property Relationships ◽  
Oriented Films ◽  
Materials Used ◽  
Polymer Laminates ◽  
Heated Glass

Oriented overgrowth of polymer materials onto ionic crystals is well known and recently it was demonstrated that this epitaxial crystallisation can also occur in polymer/polymer systems, under certain conditions. The morphologies and the resulting physical properties of such systems will be presented, especially the influence of epitaxial interfaces on the adhesion of polymer laminates and the mechanical properties of epitaxially crystallized sandwiched layers.Materials used were polyethylene, PE, Lupolen 6021 DX (HDPE) and 1810 D (LDPE) from BASF AG; polypropylene, PP, (PPN) provided by Höchst AG and polybutene-1, PB-1, Vestolen BT from Chemische Werke Hüls. Thin oriented films were prepared according to the method of Petermann and Gohil, by winding up two different polymer films from two separately heated glass-plates simultaneously with the help of a motor driven cylinder. One double layer was used for TEM investigations, while about 1000 sandwiched layers were taken for mechanical tests.

Much Ado About Fried Chicken: Abetting Aspiration or Respecting Autonomy?

2019 ◽  
Vol 28 (3) ◽  
pp. 1356-1362
Author(s):  
Laurence Tan Lean Chin ◽  
Yu Jun Lim ◽  
Wan Ling Choo
Keyword(s):  
Palliative Care ◽  
End Of Life ◽  
Multidisciplinary Team ◽  
Biopsychosocial Model ◽  
Family Members ◽  
Clinical Decisions ◽  
Goals Of Care ◽  
Complex Needs ◽  
Aspiration Risk ◽  
Patient Centric

Purpose Palliative care is a philosophy of care that encompasses holistic, patient-centric care involving patients and their family members and loved ones. Palliative care patients often have complex needs. A common challenge in managing patients near their end of life is the complexity of navigating clinical decisions and finding achievable and realistic goals of care that are in line with the values and wishes of patients. This often results in differing opinions and conflicts within the multidisciplinary team. Conclusion This article describes a tool derived from the biopsychosocial model and the 4-quadrant ethical model. The authors describe the use of this tool in managing a patient who wishes to have fried chicken despite aspiration risk and how this tool was used to encourage discussions and reduce conflict and distress within the multidisciplinary team.

End-of-Life Issues for People Who Use AAC

2005 ◽  
Vol 14 (3) ◽  
pp. 15-19 ◽  
Author(s):  
Melanie Fried-Oken ◽  
Lisa Bardach
Keyword(s):  
End Of Life ◽  
Life Issues ◽  
End Of Life Issues

Dysphagia in Hospice Care: The Roles of Social Work and Speech-Language Pathologists

2014 ◽  
Vol 23 (4) ◽  
pp. 173-186 ◽  
Author(s):  
Deborah Hinson ◽  
Aaron J. Goldsmith ◽  
Joseph Murray
Keyword(s):  
Social Work ◽  
End Of Life ◽  
Case Studies ◽  
End Of Life Care ◽  
Hospice Care ◽  
Patient Communication ◽  
Life Care ◽  
Speech Language Pathologists ◽  
Four Levels

This article addresses the unique roles of social work and speech-language pathologists (SLPs) in end-of-life and hospice care settings. The four levels of hospice care are explained. Suggested social work and SLP interventions for end-of-life nutrition and approaches to patient communication are offered. Case studies are used to illustrate the specialized roles that social work and SLP have in end-of-life care settings.

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