scholarly journals A Review on the Application of Nanocellulose in Cementitious Materials

Nanomaterials ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 2476
Author(s):  
Aofei Guo ◽  
Zhihui Sun ◽  
Noppadon Sathitsuksanoh ◽  
Hu Feng
Keyword(s):  
Mechanical Properties ◽  
Global Warming ◽  
Energy Consumption ◽  
Environmental Issues ◽  
Cementitious Materials ◽  
Research Progress ◽  
Future Research ◽  
Cellulose Nanofibril ◽  
Fresh Properties ◽  
Matrix Type

The development of the concrete industry is always accompanied by some environmental issues such as global warming and energy consumption. Under this circumstance, the application of nanocellulose in cementitious materials is attracting more and more attention in recent years not only because of its renewability and sustainability but also because of its unique properties. To trace the research progress and provide some guidance for future research, the application of nanocellulose to cementitious materials is reviewed. Specifically, the effects of cellulose nanocrystal (CNC), cellulose nanofibril (CNF), bacterial cellulose (BC), and cellulose filament (CF) on the physical and fresh properties, hydration, mechanical properties, microstructure, rheology, shrinkage, and durability of cementitious materials are summarized. It can be seen that the type, dosage, and dispersion of nanocellulose, and even the cementitious matrix type can lead to different results. Moreover, in this review, some unexplored topics are highlighted and remain to be further studied. Lastly, the major challenge of nanocellulose dispersion, related to the effectiveness of nanocellulose in cementitious materials, is examined in detail.

Research Progress on the Hydration of Portland Cement with Calcined Clay and Limestone

2021 ◽  
Vol 1036 ◽  
pp. 240-246
Author(s):  
Jin Tang ◽  
Su Hua Ma ◽  
Wei Feng Li ◽  
Hui Yang ◽  
Xiao Dong Shen
Keyword(s):  
Mechanical Properties ◽  
Portland Cement ◽  
Cementitious Materials ◽  
Supplementary Cementitious Materials ◽  
Research Progress ◽  
Hydration Reaction ◽  
Hydration Products ◽  
Early Hydration ◽  
Calcined Clay ◽  
Dense Microstructure

The use of calcined clay and limestone as supplementary cementitious materials, can have a certain influence on the hydration of Portland cement. This paper reviewed the influence of limestone and calcined clay and the mixture of limestone and calcined clay on the hydration of cement. Both limestone and calcined clay accelerate the hydration reaction in the early hydration age and enhance the properties of cement. Limestone reacts with C3A to form carboaluminate, which indirectly stabilized the presence of ettringite, while calcined clay consumed portlandite to form C-(A)-S-H gel, additional hydration products promote the densification of pore structure and increase the mechanical properties. The synergistic effect of calcined clay and limestone stabilize the existence of ettringite and stimulate the further formation of carboaluminate, as well as the C-(A)-S-H gel, contributed to a dense microstructure.

A review on the mechanical properties of textile structural composite T-beams

2019 ◽  
Vol 90 (5-6) ◽  
pp. 710-727 ◽  
Author(s):  
Yiwei Ouyang ◽  
Xianyan Wu
Keyword(s):  
Mechanical Properties ◽  
High Performance ◽  
Raw Materials ◽  
Research Progress ◽  
Future Research ◽  
Research Directions ◽  
Structural Composite ◽  
Delamination Resistance ◽  
Application Potential ◽  
Future Research Directions

In order to review the most effective ways to improve the mechanical properties of composite T-beams and further increase their application potential, research progress on the mechanical properties of textile structural composite T-beams was summarized based on two-dimensional (2-D) ply structure composite T-beams, delamination resistance enhanced 2-D ply structure T-beams, and three-dimensional (3-D) textile structural composite T-beams; future research directions for composite T-beams were also considered. From existing literature, the research status and application bottlenecks of 2-D ply structure composite T-beams and T-beams with enhanced delamination resistance performance were described, as were the specific classification, research progress, and mechanical properties of 3-D textile structural composite T-beams. In addition, the superior mechanical properties of 3-D braided textile structural composite T-beams, specifically their application potential based on excellent delamination resistance capacity, were highlighted. Future research directions for composite T-beams, that is, the applications of high-performance raw materials, locally enhanced design, structural blending enhancement, functionality, and intelligence are presented in this review.

Research Progress on Mechanical Properties of Short Carbon Fibre/Epoxy Composites

2019 ◽  
Vol 12 (1) ◽  
pp. 3-13 ◽  
Author(s):  
Guanghui Zhao ◽  
Jijia Zhong ◽  
Y.X. Zhang
Keyword(s):  
Mechanical Properties ◽  
Carbon Fibre ◽  
Mechanical Performance ◽  
Experimental Studies ◽  
Weight Ratio ◽  
Epoxy Composites ◽  
Experimental Techniques ◽  
Research Progress ◽  
Future Research ◽  
Short Carbon

Background: Short carbon fibre reinforced epoxy composites have many advantages such as high strength-to-weight ratio, corrosion resistance, low cost, short fabrication time and easy manufacturing. Researches on the mechanical performance of the composites are mainly carried out by means of experimental techniques and numerical calculation. Objective: The study aims to report the latest progress in the studies of mechanical properties of short carbon fibre reinforced epoxy composites. Methods: Based on recently published patents and journal papers, the experimental studies of short carbon fibre reinforced epoxy composites are reviewed and the effects of short carbon fibre on the mechanical properties of the composites are discussed. Numerical studies using representative volume element in simulating macroscopic mechanical properties of the short fibre reinforced composites are also reviewed. Finally, future research of short carbon fibre reinforced epoxy composites is proposed. Results: Experimental techniques, experimental results and numerical simulating methods are discussed. Conclusion: Mechanical properties of epoxy can be improved by adding short carbon fibres. Fiber surface treatment and matrix modification are effective in enhancing interfacial adhesion between fiber and matrix, and as a result, better mechanical performance is achieved. Compared to the studies on equivalent mechanical properties of the composites, researches on the micro-mechanism of interaction between fiber and matrix are still in infancy due to the complexity of both the internal structure and reinforcing mechanism.

scholarly journals Mechanical properties of nanomaterials: A review

2020 ◽  
Vol 9 (1) ◽  
pp. 259-273 ◽  
Author(s):  
Qiong Wu ◽  
Wei-shou Miao ◽  
Yi-du Zhang ◽  
Han-jun Gao ◽  
David Hui
Keyword(s):  
Mechanical Properties ◽  
Materials Science ◽  
Surface Effect ◽  
Electronic Devices ◽  
Research Progress ◽  
Tunneling Effect ◽  
Future Research ◽  
Nano Materials ◽  
Application Range ◽  
Potential Applications

AbstractAs an emerging material, nanomaterials have attracted extensive attention due to their small size, surface effect and quantum tunneling effect, as well as potential applications in traditional materials, medical devices, electronic devices, coatings and other industries. Herein, the influence of nanoparticle selection, production process, grain size, and grain boundary structures on the mechanical properties of nanomaterials is introduced. The current research progress and application range of nano-materials are presented. The unique properties of nano-materials make them superior over traditional materials. Therefore, nanomaterials will have a broader application prospect in the future. Research on nanomaterials is significant for the development and application of materials science.

scholarly journals Recent Progress in the Application of Coconut and Palm Oil Fibres in Cement-Based Materials

2021 ◽  
Vol 13 (22) ◽  
pp. 12865
Author(s):  
Erika Futami ◽  
Payam Shafigh ◽  
Herda Yati Binti Katman ◽  
Zainah Ibrahim
Keyword(s):  
Construction Industry ◽  
Review Paper ◽  
Cementitious Materials ◽  
Natural Fibre ◽  
Research Progress ◽  
Future Research ◽  
Cementitious Composites ◽  
Mechanical And Thermal Properties ◽  
The Sustainable Development ◽  
Alternative Material

Cementitious materials are widely used in the construction industry. These materials have high compressive strength and huge environmental effects but low tensile and flexural strength. Thus, researching these materials to make them environmentally friendly is very important in terms of the sustainable development of the construction industry. In recent years, the amount of research about cementitious composites reinforced with natural fibre has increased annually. This review paper was presented to understand the latest research progress on these fibres and the needs of future research to encourage the construction industry to apply these materials. The optimum dosage of natural fibre depending on the purposes can improve the physical, mechanical and thermal properties of cementitious composites, and natural fibre is highly expected to become an alternative material of synthetic fibres, such as steel, plastic and carbon fibre.

scholarly journals The Drivers of Green Investment: A Bibliometric and Systematic Review

2021 ◽  
Vol 13 (6) ◽  
pp. 3507
Author(s):  
Andreea Chițimiea ◽  
Mihaela Minciu ◽  
Andreea-Mariana Manta ◽  
Carmen Nadia Ciocoiu ◽  
Cristina Veith
Keyword(s):  
Systematic Review ◽  
Global Warming ◽  
Environmental Issues ◽  
Future Research ◽  
Systematic Analysis ◽  
Alarm Signals ◽  
Positive Effects ◽  
Use Of Resources ◽  
Green Investment ◽  
Green Investments

Considering the growing of high alarm signals on environmental issues, the implementation of green, sustainable, responsible investments has become a priority for each organization, in addition to maximizing profits and harmonious development with the environment. The purpose of this study is to examine the importance of implementing green investments within organizations and to identify the drivers that influence decisions for the implementation of green investments. In order to achieve this, two types of analyses were used: bibliometric analysis and systematic analysis, researching the representative studies in the field. The search was carried out for the period 1990–2020, and the analyzed sample comprised 444 articles. Following the application of the two methods of analysis, the results show that in the last 6 years the interest of companies in green investments has increased significantly, organizations being concerned with the efficient use of resources and environmental issues. This research highlights the internal and external drivers over which companies have a higher or lower control, as the case may be, in order to involve in green investments. The article offers new pathways for future research on this matter. Therefore, future research may develop a detailed description of the identified drivers for green investment. In addition, further research can calculate the level of the drivers’ impact on green investment and can identify that certain drivers should be more attentively treated. Moreover, subsequent works in this field can continue to identify new drivers or new ways of promoting the already identified drivers in the present research. Consequently, green investment could produce positive effects related to the reduction of pollution and global warming.

scholarly journals Environmental Discourse in Moroccan Eco-documentary: The decryption of Scientists’ Narratives

2020 ◽  
Vol 2 (1) ◽  
pp. 199-217
Author(s):  
Mohamed Mliless ◽  
Lamiae Azzouzi
Keyword(s):  
Global Warming ◽  
General Public ◽  
Environmental Awareness ◽  
Environmental Issues ◽  
Future Research ◽  
Environmental Discourse ◽  
Perceived Susceptibility ◽  
Perceived Severity ◽  
Scientific Experts ◽  
Threat Appeals

Eco-documentary is a media genre that aims to raise environmental awareness among the general public. It exposes environmental degradations and presents alternatives for environmental issues such as pollution, global warming, and deforestation among others. For this aim, the language of scientific experts contributes a lot to the making of the argumentative flow of the documentary. Within the framework of ecolinguistics, this article examines fear and threat expressions used by scientists to reinforce argumentation in Faouzi’s (2012) entitled /الزرقاء المرجة انين: Whining of the Blue Lagoon/. In this direction, Witte, Cameron, McKeon, & Berkowitz's (1996) model of "perceived severity" and "perceived susceptibility" was adopted to explain the use of fear and threat appeals in the film. The results show that ‘perceived severity’ and ‘perceived susceptibility’ expressions are preponderant in experts’ discourse. This study has many implications for eco-documentary producers, governmental and non-governmental organs, and future research in Morocco to explore other facets of films that report about man’s damages perpetrated to environmental settings and resources.  

Research Progress and Existent Problem of Nano Cement

2013 ◽  
Vol 834-836 ◽  
pp. 689-692
Author(s):  
Yi Guo Xue ◽  
Shu Cai Li ◽  
Nan Zhang
Keyword(s):  
Mechanical Properties ◽  
Energy Consumption ◽  
Physical And Mechanical Properties ◽  
Environmentally Friendly ◽  
New Method ◽  
Research Progress ◽  
Application Field ◽  
Existing Problems ◽  
Reduce Energy Consumption ◽  
Existent Problem

Nanotechnology provides a new method on modified cement. It introduces the research and application of nanocement situation and existing problems in the paper. The nanocement has better mechanical properties and durability than the current ordinary cement, and it is environmentally friendly. It can improve the microstructure of cement in order to improve their physical and mechanical properties and durability, and it can reduce energy consumption. The current focus is to study the microstructure and mechanical properties of nanoconcrete, as well as how to prepare inexpensive nanomaterials. Future, the nanocement will have a wider application field.

Metabolism and Distribution of Novel Tumor Targeting Drugs In Vivo

2020 ◽  
Vol 21 (13) ◽  
pp. 996-1008
Author(s):  
Mengli Wang ◽  
Qiuzheng Du ◽  
Lihua Zuo ◽  
Peng Xue ◽  
Chao Lan ◽  
...  
Keyword(s):  
Monoclonal Antibodies ◽  
Small Molecule ◽  
High Efficiency ◽  
Tumor Therapy ◽  
Research Progress ◽  
Future Research ◽  
Pharmacokinetic Parameters ◽  
Molecular Characteristics ◽  
Targeted Drugs

Background: As a new tumor therapy, targeted therapy is becoming a hot topic due to its high efficiency and low toxicity. Drug effects of targeted tumor drugs are closely related to pharmacokinetics, so it is important to understand their distribution and metabolism in vivo. Methods: A systematic review of the literature on the metabolism and distribution of targeted drugs over the past 20 years was conducted, and the pharmacokinetic parameters of approved targeted drugs were summarized in combination with the FDA's drug instructions. Targeting drugs are divided into two categories: small molecule inhibitors and monoclonal antibodies. Novel targeting drugs and their mechanisms of action, which have been developed in recent years, are summarized. The distribution and metabolic processes of each drug in the human body are reviewed. Results: In this review, we found that the distribution and metabolism of small molecule kinase inhibitors (TKI) and monoclonal antibodies (mAb) showed different characteristics based on the differences of action mechanism and molecular characteristics. TKI absorbed rapidly (Tmax ≈ 1-4 h) and distributed in large amounts (Vd > 100 L). It was mainly oxidized and reduced by cytochrome P450 CYP3A4. However, due to the large molecular diameter, mAb was distributed to tissues slowly, and the volume of distribution was usually very low (Vd < 10 L). It was mainly hydrolyzed and metabolized into peptides and amino acids by protease hydrolysis. In addition, some of the latest drugs are still in clinical trials, and the in vivo process still needs further study. Conclusion: According to the summary of the research progress of the existing targeting drugs, it is found that they have high specificity, but there are still deficiencies in drug resistance and safety. Therefore, the development of safer and more effective targeted drugs is the future research direction. Meanwhile, this study also provides a theoretical basis for clinical accurate drug delivery.

Mix Networks: Existing Scenarios and Future Directions on Security and Privacy

2019 ◽  
Vol 14 ◽  
Author(s):  
Khaleel Ahmad ◽  
Afsar Kamal
Keyword(s):  
Security And Privacy ◽  
Research Progress ◽  
Future Research ◽  
Future Directions ◽  
Practical Solution ◽  
Research Gap ◽  
The Web ◽  
Privacy Enhancing Techniques

Background: Privacy enhancing techniques are developed in order to provide strong protection to cyberspace. These techniques aim to allow users to keep their identities hidden during the communication when they are sending email, making payments online, browsing the Web or posting to newsgroups. MixNet is the most practical solution for concealing identities of message and sender’s identities. Objective: It provides sender and receiver anonymity as well as message security. The main goal of MixNet is to overcome vulnerability and enhance the performance of communication. It can efficiently handle the messages of various length and produce desirable results with privacy. The main objective of this paper is to acquire information and concepts regarding MixNet. We also provide guidelines for future research and references. Methods : The designing of MixNet depends on what cryptosystem method is used. Symmetric and Asymmetric both are used. Other methods could be also used such as PIR, CSP and FDR model, RPC, Token-based approach or others. Result: In this paper we provide an overview of MixNet approaches and presented a survey on MixNet based techniques and different models. We also constructed the comparison tables as per our requirements for better understanding. For this purpose, we found a total of 120 articles related to the MixNet published between 1990 and 2018 from the most relevant scientific resources. However, only 86 papers were analyzed due to comprehensiveness and relevancy to this article. Conclusion: Focused on the security and privacy of communication and how it can be achieved. This survey also reveals research progress and research gap on MixNet.

Sign in / Sign up

Export Citation Format

Share Document