A Review on Geopolymer Concrete (original) (raw)
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Concrete is the world's most versatile, durable and reliable construction material. Next to water, concrete is the most used material, which required large quantities of Portland Cement. Ordinary Portland Cement production is the second only to the automobile as the major generator of carbon di oxide, which polluted the atmosphere. In addition to that large amount energy was also consumed for the cement production. Hence, it is inevitable to find an alternative material to the existing most expensive, most resource consuming Portland Cement. Geopolymer concrete is an innovative construction material which shall be produced by the chemical action of inorganic molecules. Fly Ash, a by-product of coal obtained from the thermal power plant is plenty available worldwide. Flyash is rich in silica and alumina reacted with alkaline solution produced aluminosilicate gel that acted as the binding material for the concrete. It is an excellent alternative construction material to the existing plain cement concrete. Geopolymer concrete shall be produced without using any amount of ordinary Portland cement. This paper briefly reviews the constituents of geopolymer concrete, its strength and potential applications.
A study on the strength development of geopolymer concrete using fly ash
International Journal of Engineering & Technology, 2017
Cement consumption is increasing day by day due to the tremendous development in the infrastructure facilities. The production of one ton of cement emits approximately one ton of carbon dioxide to the atmosphere. In order to reduce the use of cement a new-generation concrete has been developed such as geopolymer concrete (GPC).Geopolymer Geopolymer is a new material which has the potential to replace ordinary Portland cement. It is an inorganic material synthesized by alkali activation of amorphous aluminosilicates at ambient or slightly increased temperatures having an amorphous to semi-crystalline polymeric structure. In this study, low calcium flyash from Tuticorin was used to produce geopolymer concrete. The geopolymer was synthesized with sodium silicate and sodium hydroxide solutions. The sodium hydroxide pellets was dissolved in the distilled water to make free from mixing water contaminants. The ratio of sodium silicate and sodium hydroxide ratio was kept as 2.5. The concent...
A Review: To Investigate the Properties of Geopolymer Concrete with Fly Ash in Place of Cement
International Journal for Research in Applied Science and Engineering Technology (IJRASET), 2022
A novel type of concrete called geopolymer concrete is created by reacting sodium silicate containing minerals with sodium aluminate and a caustic activator, such as fly ash or slag from the production of iron and metal. It can serve as a viable replacement for regular portland cement. In addition to having outstanding mechanical qualities, geopolymer concrete also possesses a number of extremely high-end qualities, including corrosion and fire resistance. The majority of industrial solid waste and bottom ash from waste incineration are stacked up at random, which not only uses up land resources but also negatively affects the ecosystem. They can be recycled and utilised as raw materials to make geopolymer concrete. Geopolymer concrete has the ability to absorb pollutants like heavy metals and other radioactive chemicals, so that its stability, elasticity, and thermal qualities are unaffected. However, geopolymer concrete's use goes beyond that because of its superior qualities. The geopolymerization of concrete, the origin of the raw materials, the numerous categories of activators, the development processes, and the diverse applications of geopolymer concrete in various fields are all covered in this paper. In this section, the factors that affect the mechanical and abrasion resistance of geopolymer concrete. In order to establish a hypothesis that will be used to develop geopolymer concrete for future development, the disadvantages and application quantification of geopolymer concrete, as well as its mix design, will be summarised in this paper.
Feasibility Study on Fly Ash based Geopolymer Concrete
Concrete is the most widely used building material in the construction of infrastructures such as buildings, highways, dams, and many other facilities. The increasing of worldwide production of ordinary Portland cement to meet infrastructure developments indicates that concrete will continue to be a chosen as the most common material of construction in the future. The production of cement consumes a lot of energy and increase CO 2 emission to the atmosphere. Another alternative to make environment friendly concrete is the development of geopolymer which is an inorganic alumina-silicate polymer, synthesized from materials of geological origin or by product materials such as fly ash which is rich in silicon and aluminum. In this study, 2 mixes were produced to evaluate the effect of key parameters on the mechanical properties of concrete and its behavior. For curing of specimens ambient curing (at room temperature) and oven curing at a temperature of 75ᵒC have been used. Geopolymer concrete gives better results in workability of concrete as compare to conventional concrete. Test results reveal that fly ash based geopolymer concrete gives better results of compressive strength than ordinary Portland cement. As the fluid to fly ash ratio increases the compressive strength decreases. For oven drying curing increase in compressive strength is more than ambient curing at room temperature as compare to conventional concrete.
Geopolymer Concrete - A Brief Review
2014
Large quantities of Portland cement is one of the major generator of carbon dioxide, into the atmosphere causing environmental problems and In addition to that large amount of embodied energy also being consumed for the cement production and also consumes huge amount of the natural resources i.e. limestone and fossils fuel but also produces almost 0.9t of CO2 for 1t cement clinker production. Also world cement production generates 2.8 billion ton manmade greenhouse gas annually on the other side abundant availability of fly ash worldwide creates opportunity to utilize (byproduct of burning coal, regarded as a waste material) as substitute for OPC to manufacture concrete solving the disposal problem and substitute to concrete by an eco friendly and sustainable material similar to conventional concrete. Geopolymer or inorganic alumino-silicates polymer is synthesized from predominantly silicon and aluminum materials of geological origin or by product materials, such as fly ash with alkaline liquids such as a combination of Sodium Silicate and Sodium Hydroxide. The chemical composition of geopolymer is similar to that of zeolite, but amorphous in microstructure. Flyash-based geopolymer binders show excellent short and long-term mechanical characteristics and similar or even better to conventional concrete and geopolymers are much superior to aggressive environment and fire than conventional concrete.
Review: An Overview of Geopolymer Concrete
International Journal of Technical Research & Science, 2020
The world's most used construction material is concrete comprised of cement, aggregate, water, and added substances as it is seen as progressively flexible, tough, and dependable. Concrete is the second most useful material after water, which required huge amounts of Portland cement. The manufacturing procedure of Ordinary Portland Cement (OPC) emits a lot of CO2 which is very harmful to the environment. The amount of carbon emission is increasing day by day hence have to find an alternative of cement concrete. Geopolymer concrete is the best alternative of Portland cement which is manufactured by organic compound molecules. Fly Ash, is a measurable component of geopolymer concrete which is available in a lot of amounts. Fly ash is a waste by-product of thermal power plant its is easily accessible around world. Fly ash is rich in silica and alumina which when mix with alkaline activators makes and binding material knows as alumina silicate gel. This is the best alternative for construction material in place of Portland cement concrete. Geopolymer concrete a greener substitute for normal Portland concrete cement. This paper tells about the constituents of geopolymer concrete, its quality, and its applications.
Flyash Geopolymer Concrete as Future Concrete
2013
Demand for concrete as construction material is on the increase so as the production of cement. It is estimated that ~6-8% of total CO 2 is generated from construction industry. To reduce the concrete industry"s carbon footprint, blended cements are in use in the market. The research trend is directed towards more eco-friendly concrete such as geopolymer. Recently the focus of research has been shifted on use of fly ash for geopolymerisation. This is based on the alumino-silicate composition of fly ash, it"s easy availability, better flow ability and improved durability. The chemical composition of geopolymer is similar to that of zeolite, but amorphous in microstructure. Flyash-based geopolymer concrete show excellent short and long-term properties. The properties and uses of geopolymers are being explored in many scientific and industrial disciplines like modern inorganic chemistry, physical chemistry, colloid chemistry, mineralogy, geology, and in all types of engineering process technologies. The current paper presents scope of flyash based geopolymer concrete as future concrete, summarizes and critically analyses the most important research findings.
Review on fly ash-based geopolymer concrete without Portland Cement
The consumption of Ordinary Portland Cement (OPC) caused pollution to the environment due to the emission of CO2. As such, alternative material had been introduced to replace OPC in the concrete. Fly ash is a by-product from the coal industry, which is widely available in the world. Moreover, the use of fly ash is more environmental friendly and save cost compared to OPC. Fly ash is rich in silicate and alumina, hence it reacts with alkaline solution to produce aluminosilicate gel that binds the aggregate to produce a good concrete. The compressive strength increases with the increasing of fly ash fineness and thus the reduction in porosity can be obtained. Fly ash based geopolymer also provided better resistance against aggressive environment and elevated temperature compared to normal concrete. As a conclusion, the properties of fly ash-based geopolymer are enhanced with few factors that influence its performance.