scholarly journals COMPOSITE MATERIALS MODIFIERS BASED ON CEMENT

2021 ◽  
Author(s):  
З.З. Аларханова ◽  
Д. К-С. Батаев
Keyword(s):  
Composite Materials ◽  
Mechanism Of Action ◽  
Building Materials ◽  
Melamine Formaldehyde ◽  
Cement Based Materials

В статье рассмотрено одно из основных направлений развития наноинженерии строительных материалов. Модификация композиционных материалов на основе цемента поликарбоксилатами. Рассмотрены особенности механизма действия поликарбоксилатных суперпластификаторов на свойства бетона в сравнении с традиционными пластифицирующими добавками на основе сульфированных нафталини или меламинформальдегидных соединений. Представлены перспективы развития наноинженерии в модификации материалов на основе цемента. The article discusses one of the main directions of development of nanoengineering of building materials. Modification of cement-based composite materials with polycarboxylates. The features of the mechanism of action of polycarboxylate superplasticizers on the properties of concrete are considered in comparison with traditional plasticizing additives based on sulfonated naphthalene- and or melamine-formaldehyde compounds. Prospects for the development of nanoengineering in the modification of cement-based materials are presented.

scholarly journals The influence of cement-based composite materials on the performance of bridges: modification and optimization by nano-SiO2 material

2020 ◽  
Vol 15 (3) ◽  
pp. 409-413
Author(s):  
Cheng Zhu
Keyword(s):  
Compressive Strength ◽  
Composite Materials ◽  
Flexural Strength ◽  
Building Materials ◽  
Complex Environments ◽  
Nano Sio2 ◽  
Bending Resistance ◽  
Cement Based Materials ◽  
Different Content ◽  
Compression Resistance

Abstract Cement-based materials have been widely used in bridge construction. In order to further improve their performance, this study analyzed the modification and optimization functions of nano-SiO2 materials, designed test specimens with different content of nano-SiO2 and conducted experiments on their flow performance, compression resistance, bending resistance and impermeability. The results showed that the flow performance of the materials decreased and the impermeability decreased with the increase of nano-SiO2 content. The compressive strength and flexural strength are the best when the content of nano-SiO2 is 1%. On the whole, the best content of nano-SiO2 is 1%; when the content of nano-SiO2 is 1%, all the properties of the specimens are good, which is more conducive to the construction of bridges in various complex environments. The research in this paper has made some contributions to the further application of nano-SiO2 in the optimization of building materials, which is conducive to the better development of building materials.

scholarly journals Study on Visible Light Catalysis of Graphite Carbon Nitride-Silica Composite Material and Its Surface Treatment of Cement

Crystals ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 490 ◽  
Author(s):  
Weiguang Zhong ◽  
Dan Wang ◽  
Congcong Jiang ◽  
Xiaolei Lu ◽  
Lina Zhang ◽  
...  
Keyword(s):  
Composite Materials ◽  
Specific Surface ◽  
Surface Treatment ◽  
Surface Area ◽  
Specific Surface Area ◽  
Carbon Nitride ◽  
Building Materials ◽  
Raw Materials ◽  
Silica Composite ◽  
Cement Based Materials

Cement-based composite is one of the essential building materials that has been widely used in infrastructure and facilities. During the service of cement-based materials, the performance of cement-based materials will be affected after the cement surface is exposed to pollutants. Not only can the surface of cement treated with a photocatalyst degrade pollutants, but it can also protect the cement-based materials from being destroyed. In this study, graphite carbon nitride-silica composite materials were synthesized by thermal polymerization using nanosilica and urea as raw materials. The effect of nanosilica content and specific surface area were investigated with the optimal condition attained to be 0.15 g and 300 m2/g, respectively. An X-ray diffractometer, thermogravimetric analyzer, scanning electron microscope, a Brunauer–Emmett–Teller (BET) specific surface area analyzer and ultraviolet-visible spectrophotometer were utilized for the characterization of as-prepared graphite carbon nitride-silica composite materials. Subsequently, the surface of cement-based materials was treated with graphite carbon nitride-silica composite materials by the one-sided immersion and brushing methods for the study of photocatalytic performance. By comparing the degradation effect of Rhodamine B, it was found that the painting method is more suitable for the surface treatment of cement. In addition, through the reaction of calcium hydroxide and graphite carbon nitride-silica composite materials, it was found that the combination of graphite carbon nitride-silica composite materials and cement is through C-S-H gel.

scholarly journals Elaboration and Characterization of Composite Materials Based on Plaster-Gypsum and Mineral Additives for Energy Efficiency in Buildings

Proceedings ◽  
2019 ◽  
Vol 34 (1) ◽  
pp. 22
Author(s):  
Bouzit ◽  
Taha
Keyword(s):  
Thermal Conductivity ◽  
Energy Efficiency ◽  
Composite Materials ◽  
Building Material ◽  
Building Materials ◽  
Building Envelope ◽  
Acoustic Properties ◽  
Building Sector ◽  
Acoustic Performance ◽  
Mineral Additives

The building sector is one of the largest energy consumers in the world, prompting scientific researchers to find solutions to the problem. The choice of appropriate building materials presents a considerable challenge for improving the thermal comfort of buildings. In this scenario, plaster-based insulating materials have more and more interests and new applications, such as insulating coatings developing the building envelope. Several works are being done to improve energy efficiency in the building sector through the study of building materials with insulation quality and energy savings. In this work, new composite materials, plaster-gypsum with mineral additives are produced and evaluated experimentally to obtain low-cost materials with improved thermo-physical and acoustic properties. The resulting composites are intended for use in building walls. Plaster-gypsum is presented as a high-performance thermal material, and mineral additives are of great importance because of their nature and are environmentally friendly. Measurements of thermal properties are carried and measurements of acoustic properties. The results show that it is possible to improve the thermal and acoustic performance of building material by using plaster as a base material and by incorporating thermal insulators. The thermal conductivity of plaster alone is greater than that of plaster with mineral additives, offer interesting thermal and acoustic performance. By varying the additives, the thermal conductivity changes. Finally, comparing the results, plaster with mineral additives is considered the best building material in this study

scholarly journals Wall Panel Made of Bio-composites

2019 ◽  
Vol 279 ◽  
pp. 02010
Author(s):  
Lukáš Bosák ◽  
Milan Palko
Keyword(s):  
Composite Materials ◽  
Composite Laminates ◽  
Building Materials ◽  
Building Industry ◽  
Environmental Load ◽  
Wall Panel ◽  
Outer Envelope ◽  
Composite Wall ◽  
Materials Used ◽  
The Eu

Sustainability is currently an important part of the building industry. The development of new building constructions and the use of ecological materials is a very popular topic in this area. One example of organic material are natural fibres bio-composites. Bio-composite materials are currently used in the form of laminates mainly used in the sport and furniture industries. This article addresses their use in the building industry as the outer envelope of buildings. The article deals with the testing of the influence of UV radiation and moisture on the degradation of Bio-composites with recommendation of possible ways of their protection. In the next section, it deals with the design of composite wall panel with Bio-composite laminates on the top layer. This panel will contain mycelium as thermal insulation. The assumption of the use of this type of construction in the building industry is based on the possibility of replacing conventional materials used nowadays and reducing the environmental load by the building industry. The use of new types of eco-friendly building materials is in accordance with the EU strategy.

scholarly journals Crossover Effect in Cement-Based Materials: A Review

2019 ◽  
Vol 9 (14) ◽  
pp. 2776 ◽  
Author(s):  
Sumra Yousuf ◽  
Payam Shafigh ◽  
Zainah Ibrahim ◽  
Huzaifa Hashim ◽  
Mohammad Panjehpour
Keyword(s):  
Compressive Strength ◽  
Construction Industry ◽  
Building Materials ◽  
Cement Hydration ◽  
Curing Temperature ◽  
Future Research ◽  
Hydration Products ◽  
Crossover Effect ◽  
Cement Based Materials ◽  
Mineral Compositions

Cement-based materials (CBMs) such as pastes, mortars and concretes are the most frequently used building materials in the present construction industry. Cement hydration, along with the resulting compressive strength in these materials, is dependent on curing temperature, methods and duration. A concrete subjected to an initial higher curing temperature undergoes accelerated hydration by resulting in non-uniform scattering of the hydration products and consequently creating a great porosity at later ages. This phenomenon is called crossover effect (COE). The COE may occur even at early ages between seven to 10 days for Portland cements with various mineral compositions. Compressive strength and other mechanical properties are important for the long life of concrete structures, so any reduction in these properties is of great concern to engineers. This study aims to review existing information on COE phenomenon in CBMs and provide recommendations for future research.

Electromagnetic Properties of Bearing Cement-Based Materials

2011 ◽  
Vol 261-263 ◽  
pp. 663-668
Author(s):  
Ai Li Guo ◽  
Ri Gao ◽  
Heng Jing Ba
Keyword(s):  
Electromagnetic Wave ◽  
Electromagnetic Waves ◽  
Building Materials ◽  
Incident Angle ◽  
High Strength ◽  
Wave Incident ◽  
Electromagnetic Properties ◽  
Frequency Range ◽  
Electromagnetic Wave Incident ◽  
Cement Based Materials

For studying absorption/bearing integration of building materials, high-strength cement-based materials were prepared by using active fly ash, silica fume and quartz, etc. Electromagnetic parameters of the cement-based materials were measured through coaxial method, and then by means of these parameters, the reflectivity of electromagnetic waves of the cement-based materials were simulated under variable electromagnetic wave incident angle (θ), frequency (f) and thickness of the material(d).The reflectivity of electromagnetic waves with 8~18GHz frequency range vertically transmitting into the cement-based materials was obtained through far field radar scattered cross-section measurement, and was compared with simulated reflectance under the same incident conditions. The results show that the high-strength cement-based materials with imaginary part of dielectric constant can consume energy of the incident electromagnetic wave. Incident angle less than 15° has little effect on the reflectivity of the cement-based materials in 2~18GHz frequency range. While the thickness of the cement-based materials is 15mm or 25mm, simulation results of the reflectivity are in good agreement with measured ones. Measured absorption peak and -10dB bandwidth increase with the increasing of thickness of the cement-based materials with compressive strength of 120.7MPa. This suggests that the cement-based materials studied in this paper have the characteristics of absorption/bearing integration.

An Assessment of the PCM/Timber Composite in Buildings

2014 ◽  
Vol 604 ◽  
pp. 227-231 ◽  
Author(s):  
Janis Kazjonovs ◽  
Jana Vecstaudz ◽  
Janis Locs ◽  
Diana Bajare ◽  
Aleksandrs Korjakins
Keyword(s):  
Computer Simulation ◽  
Composite Material ◽  
Composite Materials ◽  
Building Materials ◽  
Material Behavior ◽  
Thermal Mass ◽  
Cooling Loads ◽  
Modeling Study

This paper reviews a modeling study on PCM/timber composite materials and their incorporation in building materials, particularly in passive applications. Commercially available paraffin PCMs (RT21 and RT27) were incorporated in timber for increasing its thermal mass. In order to evaluate PCM/timber composite material behavior in building, computer simulation was performed. The obtained results showed that by using this technique it is possible to increase the thermal mass and reduce cooling loads in summer conditions.

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