scholarly journals Hydrotalcites in Construction Materials

2020 ◽  
Vol 10 (22) ◽  
pp. 7989
Author(s):  
Anna-Marie Lauermannová ◽  
Iva Paterová ◽  
Jan Patera ◽  
Kryštof Skrbek ◽  
Ondřej Jankovský ◽  
...  
Keyword(s):  
Ion Exchange ◽  
Radioactive Waste ◽  
Construction Industry ◽  
Layered Double Hydroxides ◽  
Building Materials ◽  
Construction Materials ◽  
Water Molecules ◽  
Wide Range ◽  
Waste Repository ◽  
Double Hydroxides

Hydrotalcites are layered double hydroxides displaying a variety of stoichiometry caused by the different arrangement of the stacking of the layers, ordering of the metal cations, as well as the arrangement of anions and water molecules, in the interlayer galleries. The compounds of the hydrotalcite group show a wide range of the possible applications due to their specific properties, such as their large surface area, ion exchange ability, the insolubility in water and most of the organic sorbents, and others. Affordability, wide possibilities of manufacturing, and presence of sufficient natural deposits make hydrotalcites potentially very useful for the construction industry, as either a building material itself or an additive in mortars, concrete or in polymers composites used in constructions. Similar possible application of such material is in leakage control in a radioactive waste repository. The effect of use of these materials for ion exchange, anti-corrosion protection, radioactive ions containment, and similar purposes in building materials is examined in this review.

Nanocomposite Photocatalyst Based on Layered Double Hydroxides (LDHs) Associated with TiO2

2014 ◽  
Vol 92 ◽  
pp. 100-109 ◽  
Author(s):  
Jonjaua Ranogajec ◽  
Andrijana Sever-Skapin ◽  
Ognjen Rudic ◽  
Snezana Vucetic
Keyword(s):  
Photocatalytic Activity ◽  
Layered Double Hydroxides ◽  
Direct Contact ◽  
Building Materials ◽  
Specific Problem ◽  
The Self ◽  
Different Types ◽  
Double Hydroxides ◽  
Positive Effect ◽  
Material Porosity

The surfaces of building materials are constantly exposed to the actions of environmental factors, pollutants of inorganic and organic origin as well as to microorganisms, which significantly contribute to corrosion phenomena.The application of coatings decreases the negative action of the pollutants minimizing their direct contact with the substrate. Different types of coatings with additional functions have been developed. A specific problem of these applications is the lack of compatibility of the photocatalysts with the surface of the building materials and the detachment of potentially toxic TiO2nanoparticles. In the present study, this problem was solved by the proper immobilization of TiO2nanoparticles onto the photocatalyst support, layered double hydroxides (LDHs). The newly formed coating possesses acceptable porosity for a porous building material (porosity within the range of 30-46 %) and satisfied photocatalytic activity, as well as mineralogical compatibility with the substrates (mortars, renders, bricks). Additionally, a positive effect considering the self-cleaning phenomenon was attained.

scholarly journals Bio-based construction materials for a sustainable future

2019 ◽  
Author(s):  
Rijk Block ◽  
Barbara Kuit ◽  
Torsten Schröder ◽  
Patrick Teuffel
Keyword(s):  
Construction Industry ◽  
Structural Engineering ◽  
Building Materials ◽  
Raw Materials ◽  
Construction Materials ◽  
Flax Fibres ◽  
The Past ◽  
Natural Building ◽  
Paris Climate Agreement ◽  
Primary Materials

<p>The structural engineering community has a strong responsibility to contribute to a more efficient use of natural resources. Nowadays the construction industry is by far the most resource intense industry sector, approximately 40-50% of all primary raw materials are used, which raises the question about the architects and engineer’s accountability. In this context and as a result of the Paris Climate agreement the Dutch government defined the program “Nederland Circulair in 2050”, which states the ambition to use 50% less primary materials in 2030 and to have a full circular economy in 2050.</p><p>One possible approach to achieve these ambitious goals is the application of renewable, bio-based materials in the built environment and to replace traditional, typically cement-based, materials. Already in the past natural building materials, such as timber and bamboo have been used widely, but in recent years new materials came up and provide new opportunities to be used in the construction industry. The authors explored various alternatives, such as hemp and flax fibres, mycelium and lignin-based fibres for composite materials, which will be described with various experimental and realised case studies.</p>

scholarly journals Amazing Types, Properties, and Applications of Fibres in Construction Materials

Materials ◽  
2019 ◽  
Vol 12 (16) ◽  
pp. 2513 ◽  
Author(s):  
Abbas Mohajerani ◽  
Siu-Qun Hui ◽  
Mehdi Mirzababaei ◽  
Arul Arulrajah ◽  
Suksun Horpibulsuk ◽  
...  
Keyword(s):  
Construction Industry ◽  
Asphalt Concrete ◽  
Construction Materials ◽  
Physical And Mechanical Properties ◽  
Fibre Reinforcement ◽  
Sustainable Solutions ◽  
Wide Range ◽  
The World ◽  
Long Time ◽  
Incineration Process

Fibres have been used in construction materials for a very long time. Through previous research and investigations, the use of natural and synthetic fibres have shown promising results, as their presence has demonstrated significant benefits in terms of the overall physical and mechanical properties of the composite material. When comparing fibre reinforcement to traditional reinforcement, the ratio of fibre required is significantly less, making fibre reinforcement both energy and economically efficient. More recently, waste fibres have been studied for their potential as reinforcement in construction materials. The build-up of waste materials all around the world is a known issue, as landfill space is limited, and the incineration process requires considerable energy and produces unwanted emissions. The utilisation of waste fibres in construction materials can alleviate these issues and promote environmentally friendly and sustainable solutions that work in the industry. This study reviews the types, properties, and applications of different fibres used in a wide range of materials in the construction industry, including concrete, asphalt concrete, soil, earth materials, blocks and bricks, composites, and other applications.

scholarly journals Embodied Energy and CO2 Emissions of Widely Used Building Materials: The Ethiopian Context

Buildings ◽  
2019 ◽  
Vol 9 (6) ◽  
pp. 136 ◽  
Author(s):  
Woubishet Zewdu Taffese ◽  
Kassahun Admassu Abegaz
Keyword(s):  
Co2 Emissions ◽  
Building Materials ◽  
Construction Materials ◽  
Developed Countries ◽  
Embodied Energy ◽  
Policy Makers ◽  
Coarse Aggregates ◽  
Human Habitat ◽  
Wide Range ◽  
Concrete Blocks

Buildings use a wide range of construction materials, and the manufacturing of each material consumes energy and emits CO2. Several studies have already been conducted to evaluate the embodied energy and the related CO2 emissions of building materials, which are mainly based on case studies from developed countries. There is a considerable gap in cases of developing countries regarding assessment of embodied energy and CO2 emissions of these building materials. This study identified the top five most used construction materials (cement, sand, coarse aggregates, hollow concrete blocks, and reinforcement bars), which are also prime sources of waste generation during construction in the Ethiopian building construction sector. Then, what followed was the evaluation of the embodied energies and CO2 emissions of these materials by examining five commercial and public buildings within the cradle-to-site lifecycle boundary. The evaluation results demonstrated that cement, hollow concrete blocks (HCB), and reinforcement bars (rebars) are the major consumers of energy and major CO2 emitters. Cumulatively, they were responsible for 94% of the embodied energy and 98% of the CO2 emissions. The waste part of the construction materials has inflated the embodied energy and the subsequent CO2 emissions considerably. The study also recommended several strategies for the reduction of embodied energy and the related CO2 emissions. The research delivers critical insights into embodied energy and CO2 emissions of the five most used building materials in the Ethiopian construction industry, as there are no prior studies on this theme. This might be a cause to arouse awareness and interest among the policy makers and the wider public to clearly understand the importance of research on this crucial issue to develop national energy and CO2 descriptors for construction materials, in order to take care of our naturally endowed, but yet fragile, human habitat.

Monovalent Ion Exchange Kinetics of Hydrated Calcium-Alumino Layered Double Hydroxides

2016 ◽  
Vol 56 (1) ◽  
pp. 63-74 ◽  
Author(s):  
Guillermo Puerta-Falla ◽  
Magdalena Balonis ◽  
Gabriel Falzone ◽  
Mathieu Bauchy ◽  
Narayanan Neithalath ◽  
...  
Keyword(s):  
Ion Exchange ◽  
Layered Double Hydroxides ◽  
Ion Exchange Kinetics ◽  
Monovalent Ion ◽  
Exchange Kinetics ◽  
Double Hydroxides ◽  
Kinetics Of ◽  
Hydrated Calcium

Testing of Possible Use of Fine-Grained Alkali Activated Composites in the Construction Industry

2016 ◽  
Vol 865 ◽  
pp. 47-52 ◽  
Author(s):  
Pavel Mec ◽  
Jana Boháčová ◽  
Petr Závrský
Keyword(s):  
Construction Industry ◽  
Setting Time ◽  
Construction Materials ◽  
Inorganic Materials ◽  
Fine Grained ◽  
Granulated Blast Furnace Slag ◽  
Wide Range ◽  
Furnace Slag ◽  
Alkali Activated ◽  
Potential Use

Alkali-activated materials are formed by the alkaline activation of inorganic materials and are characterized by the wide range of potential use. The objective of experiment was to investigate the possibility of use fine-grained alkali activated composites in the construction industry. Selected properties of alkali-activated systems based on granulated blast furnace slag and fine-grained aggregates were determined. At the beginning of the experiment, different samples prepared of 3 types of activators were tested, basic properties (time of workability, initial and final setting time, compressive and flexural strength) and also a possibility of selected retarder use was determined. Then, samples with the best potencial to presumed use were tested in detail and a possibility use as a substitute for selected construction materials were evaluated. On the basis of determined properties, prepared composites could be used as reprofiling mortars, materials for cracks repairing or socle plasters.

scholarly journals Thermal Properties of Foamed Concrete with Addition of Empty Fruit Bunch (EFB) Fiber

2019 ◽  
Vol 8 (10) ◽  
pp. 4662-4670 ◽  
Keyword(s):  
Thermal Properties ◽  
Construction Industry ◽  
Building Materials ◽  
Natural Fiber ◽  
Construction Materials ◽  
Cost Effective ◽  
Fiber Reinforced Concrete ◽  
Empty Fruit Bunch ◽  
Construction Sector ◽  
Foamed Concrete

The key players in the construction industry around the globe are very enthusiastic in producing better construction materials that are cost-effective, durable, excellent thermal insulation, lightweight and long lasting without jeopardizing the environment. One of the best ways in producing such building materials are by incorporating industrial waste materials such as Empty Fruit Bunch (EFB) fiber in foamed concrete (FC). In recent years, the spotlight has been given towards the use of natural fiber reinforced concrete-based materials especially in Malaysia in a quest of economic and environmental upkeep particularly in the construction sector itself. Hence, this study intended to recognize the influence of Empty Fruit Bunch (EFB) fiber of four different contents (0.15%, 0.30%, 0.45% and 0.60 %) by mix volume on thermal properties of FC. There were three densities of 800kg/m3 , 1100kg/m3 and 1400kg/m3 we cast and tested. The mix design of FC (sand: cement: water) is fixed at the ratio of 1:1.5:0.45. The investigation focuses on three parameters which were thermal conductivity, thermal diffusivity and specific heat capacity. Results showed that the addition of EFB in FC plays an important role to improve the thermal performance holistically. The results demonstrated a great potential possesses by the EFB fiber to be utilized in cement-based materials such as the FC mix which is beneficial in reducing the thermal property or the transfer of heat in a produced concrete.

scholarly journals INTERNATIONAL TRENDS AND CURRENT CHALLENGES OF CONSTRUCTION MATERIALS MARKET DEVELOPMENT

2020 ◽  
Author(s):  
Yulia Orlovska ◽  
◽  
Daria Havrylenko ◽  
Keyword(s):  
Real Estate ◽  
Construction Industry ◽  
Information And Communication Technologies ◽  
Building Materials ◽  
Construction Materials ◽  
Construction Sector ◽  
International Trends ◽  
The World ◽  
The Impact ◽  
Construction Services

The main international trends in the world market of construction materials and services have been analyzed. The dynamics of world GDP and exports of construction services for the period 2000-2019 has been studied and a conclusion is made on the impact of economic crises on their growth rates. It has been determined that the dynamics of world exports of construction services is characterized by high instability with peaks of growth and decline, and is more sensitive than GDP growth. It has been noted that overcoming the crisis in the export sector of construction services takes more time and occurs with an approximate two-year time lag compared to GDP dynamics. The share of the construction industry in the world GDP by the degree of development has been analyzed. The reasons for the decline in the share of the construction industry in countries with economies in transition have been substantiated. It has been noted that in the developed countries the share of the construction sector is accounted for by real estate management activities related to maintenance, rent, purchase and sale and other transactions with land and real estate. The forecast values of growth of the market of building materials and services till 2030 have been given. The essence of the term «wide construction» has been revealed and the structure of this sector in different countries of the world is shown. The main exporters in the world construction market have been given and the structural distribution of the largest construction companies in the world ranking by country of origin has been analyzed. The dynamics of income level in the construction industry market for the period 2011-2018 has been studied. It has been noted that an important area of the construction sector is the market of roofing and facade materials and the world's largest companies for the production of this type of construction materials have been revealed. Conclusions on the essence of global transformations of the market of building materials and services have been made, and also it has been defined that they are caused by transnationalization of corporate structure of the market, influence of scientific and technical progress and information and communication technologies on world centers as well as the emergence of the concept of «sustainable construction» in the course of humanity for sustainable development.

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