#geopolymers

Polymers from earth can make cement more climate-friendly

Concrete is all around you—in the foundation of your home, the bridges you drive over, the sidewalks and buildings of cities. It is often described as the second-most used material by volume on Earth after water. But the way concrete is made today also makes it a major contributor to climate change. Portland cement, the key component of concrete, is responsible for about 8% of global greenhouse gas emissions. That's because it's made by heating limestone to high temperatures, a process that burns a large amount of fossil fuels for energy and releases carbon dioxide from the limestone in the process. The good news is that there are alternatives, and they are gaining attention.

Geopolymer Cement Based on Bioactive Egg Shell Waste or Commercial Calcium Carbonates by HHM Darweesh* in Crimson Publishers: Peer Reviewed Material Science Journals 

Geopolymer cements were prepared using a bioactive waste like Egg Shell Powder (ESP) and Commercial Calcium Carbonate (CCC). These geopolymer cements were prepared by adding 6M phosphoric acid as a chemical hardener to siliceous clay containing 0, 3, 6, 9, 12 and 15wt. % from ESP and CCC. Results showed that Toshka clay (T-C) which is siliceous material, and it is mainly composed of kaolinite, illite and quartz phases. This was confirmed by the XRD patterns, and other trace minerals have also been found. The ESP is composed of calcium carbonate, CaCO3. Results showed that the bulk density of the prepared geopolymer cements improved and increased with the gradual replacement with ESP or CCC at the expense of the T-C only up till 12wt. %, while the water absorption and apparent porosity decreased, whereas the flexural and compressive strengths improved and enhanced. However, all the characteristics of geopolymer cements based on ESP are higher than those based on CCC. The optimum geopolymer cement was that incorporated 12wt. % ESP waste because it achieved the best results. It was also concluded that the low-grade calcium carbonate-rich wastes of the egg shells could be used as a pore-forming agent to produce porous geopolymer cements. This could be successfully utilized as thermal insulation units if the geopolymer cement incorporated high amounts of it. 

For more Open access journals in Crimson Publishers please click on below link https://crimsonpublishersresearch.com/

Study of the Compression Resistance of a Geopolymer Based Composite with Added Jute Fiber by Lais Alves* in Crimson Publishers: Peer Reviewed Material Science Journals 

Due to the need for new technologies that reduce the negative impact on the environment, the geopolymers, aluminosilicate-based materials, appear as a good alternative to Portland cement for having good mechanical properties, such as high initial strength. The objective of this work was to analyze the behavior of industrial geopolymer composites with the addition of jute fibers, according to the curing time of the material and the amount of fiber inserted, trying to identify if their use could bring benefits in the mechanical properties of the composite. Compression tests were made, and the results showed that the fibrous reinforced geopolymer composites have brought a good compatibility between fiber and matrix, showing a good mechanical behavior. The addition of the fibers allowed a greater ability of the composite to resist the loads after cracking, increasing its ductility. In addition to the increased deformation, there was also an increase in the compressive strength of the material.

For more Open access journals in Crimson Publishers please click on below link https://crimsonpublishersresearch.com/

Geopolymer: A Review of Structure, Applications and Properties of Fiber Reinforced Composites by Fernando Gomes de Souza Juniour in Crimson Publishers: Peer Reviewed Material Science Journals 

Geopolymers are a new class of high performance materials able to replace traditional Portland cement due to its excellent mechanical properties, high initial resistance and durability. The raw material used for the production of geopolymers generally consists of industrial wastes such as fly ash and met kaolin, both rich in silica and alumina. Thus, geopolymers are an economically viable alternative for minimizing environmental impact by carbon sequestration. Although extremely resistant, their mechanical properties can be improved by the insertion of reinforcing agents. Among them, the fibers improve several properties such as tensile strength and toughness; besides allow controlling the cracking mechanism and the ductility of the geopolymer composites. Among the fibers used as geopolymer reinforcement the metallic, inorganic, organic and natural fibers should be highlighted. Each of these reinforcement materials influences positively the mechanical properties of the geopolymer composite, thus favoring a wide range of applications, especially in civil construction. Therefore, the objective of this work was to study the influence of the addition of different fibers on the mechanical properties of geopolymer matrix composites.

For more Open access journals in Crimson Publishers please click on below link https://crimsonpublishersresearch.com/

Chicago, United States, March 20, 2020,Report Hive Research adds Geopolymers Market report to its research database. It is a comprehensive study of crucial elements of the markets such as drivers, growth opportunities, restraints, on-going and upcoming trends, SWOT analysis, and many more among other market influencers and strategic data. After thoroughly analysing these market elements, the data…

Geopolymers Trends and Forecast 2019

MarketResearchNest.com adds “Global Geopolymers Market Insights, Forecast to 2025”new report to its research database.

Geopolymers are inorganic polymer concrete, which belong to a novel class of cementitious materials. They can be mixtures of compounds that consist of repeating units of silico-aluminate (-Si-O-Al-O-), silico-oxide (Si-O-Si-O-), alumino-phosphate (-Al-O-P-O-), or…