Strength Characteristics of Low Calcium Fly Ash Based Geopolymer Concrete (original) (raw)
Related papers
2016
The main objective of this current study is to develop a cement free concrete material because of the green house effect during the manufacture of cement. It is reported that every one tonne production of cement emits one tonne carbon dioxide which causes global warming and in broad sense disturbs the entire ecological system. It results the promotion of geopolymer concrete where silica and alumina will bind together with alkaline solution during the process of polymerization. The researchers taken greater initiatives in geopolymer concrete there is no specific study related to the mix design because of commercialization and patenting. Hence the authors interested in identifying specific mix design using trial proportion of low calcium fly ash and alkaline solutions (sodium silicate and sodium hydroxide). This investigation deals with five different trial mixes with different molarity of NaOH (8M, 10M, 12M and 14M) and super plasticizer combinations under the curing temperature of 6...
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...
Development and properties of low-calcium fly ash-based geopolymer concrete
Research report GC, 2005
From 2001, we have conducted some important research on the development, manufacture, behaviour, and applications of Low-Calcium Fly Ash-Based Geopolymer Concrete. This concrete uses no Portland cement; instead, we use the low-calcium fly ash from a local coal burning power station as a source material to make the binder necessary to manufacture concrete.
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.
Effect of variation of fly ash on the compressive strength of flyash based Geopolymer Concrete
The production of Ordinary Portland Cement (OPC) causes havoc to the environment due to the emission of CO2 as well as mining which results in unrecoverable loss to nature. Geopolymer concrete , a cementless concrete is an innovative construction material in which binding properties are developed by the interaction of alkaline solutions with a source material that is rich in silica and alumina . Fly Ash, a by- product of coal obtained from the thermal power plant is rich in silica and alumina which on reacting with alkaline solution produces aluminosilicate gel that acts as the binding material for the concrete. It can be accepted as an excellent alternative construction material to plain cement concrete without using any amount of ordinary portland cement. Geopolymer concrete promises to be an eco friendly substitute for ordinary portland cement concrete in some applications. This paper briefly pust forward the experimental results of variation of fly ash content on compressive strength of geoploymer concrete Effect of variation of fly ash on the compressive strength of flyash based Geopolymer Concrete. Available from: https://www.researchgate.net/publication/273775158\_Effect\_of\_variation\_of\_fly\_ash\_on\_the\_compressive\_strength\_of\_flyash\_based\_Geopolymer\_Concrete [accessed Jun 13, 2017].
Study of Mechanical Properties of Fly Ash Based Geopolymer Concrete
Cement manufacture is the second most carbon dioxide emitting source while the first being by motor vehicles. The increased demand of cement leads to the increased production of cement and emission of greenhouse gases and need for alternative methods for eco-friendly binder producton.
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.
E3S Web of Conferences, 2021
This work presents the effect of Ground granulated blast furnace slag (GGBS), fly ash (FA) and metakaolin (MK) on the strength properties of geopolymer concrete (GPC). Geopolymer concrete made with FA produces calcium aluminosilicate hydrate (C-A-S-H) product due to presence of alumina and sodium aluminosilicate hydrate (N-A-S-H) gel as main reaction product of polymerization. Geopolymer concrete made with FA and GGBS, calcium silicate hydrate (C-S-H) also gets produced additionally with calcium aluminosilicate hydrate (C-A-S-H) gel and sodium aluminosilicate hydrate (N-A-S-H) gel due to presence of high content of CaO in GGBS. This additional product imparts more strength performance in GPC. In geopolymer concrete made with FA and MK, the more amount of calcium aluminosilicate hydrate (C-A-S-H) is produced due to presence of high amount of alumina in metakaolin along with sodium aluminosilicate hydrates (N-A-S-H) giving more strength to GPC. Metakaolin is recommended to be used for...
Feasibility Study of High Strength with Fly-Ash Based Geopolymer Concrete
International Journal of Innovations in Engineering and Science, 2021
Concrete being the core element used for the construction across the world has a main ingredient in it called `cement'. Production of cement leads to larger amount of carbon dioxide in the environment with a staggering amount 8% of carbon dioxide annually, on the other hand there is still increase in significant number of construction projects day after day which leads to more demand of cement. Keeping the fact protection of environment into consideration there is an immediate need of an alternative material to cement which will have same properties of cement and of course which can help to achieve environmentally friendly construction. One material is geopolymer concrete. Geopolymer concrete uses alumina silicate rich sources as binder instead of ordinary cement. It also uses different additives like industrial by-products which has encouraged an increase in workability, compressive strength, durability and minimization of effects of temperature variation. Geopolymer concrete is an innovative material which is 100% cement free. Geopolymer concrete is necessity for the future of construction industry and for a sustainable environment.
Effect of Temperature on Strength Properties of Fly ash based Geopolymer Concrete
The major problem that the earth facing today is the environmental pollution. Within the housing industry mainly the assembly of Portland cement will cause the emission of pollutants ends up in environmental pollution. Globally, the assembly of cement contributes a minimum of 5 to 7% of CO2. We can reduce the pollution effect on environment, by increasing the usage of commercial products in our housing industry. The major problem the globe is facing today is that the environmental pollution. This work carried on studies of temperature effect on strength of fly ash based geopolymer concrete. Geopolymer concrete is manufactured class F fly ash (100%). Sodium silicate solution and sodium hydroxide solution used as alkaline activator.Cubes of size 150mmX150mmX150mm were made at solution to ash ratio of 0.35. All specimens were cured in oven at 50 0 C, 60 0 C, 70 0 C & 80 0 C for different molarities 5M, 7M, 9M for a period of 20 hours. After oven curing, cubes moved to temperature for curing period. The slump cone test was carried to review the workability of concrete. After curing period of 7 days and 28 days UPV test and compressive test were performed. Concluded that different molarity Geopolymer Concrete attains maximum strength at different temperature conditions. Test results show that the 5M, 7M and 9M Geopolymer Concrete has optimum temperature of 70 0 C.