Experimental study on geopolymer concrete prepared using high-silica RHA incorporating alccofine (original) (raw)
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Effect of Rice Husk Ash on the Properties and Performance of Geopolymer Concrete
This study examines the influence of Rice Husk Ash (RHA) as an additional substance in geopolymer concrete (GPC), specifically analyzing its impact on workability, setting times, compressive strength, and splitting tensile strength. The experimental findings demonstrate that an increase in RHA concentration results in a decrease in workability and a speeding up of setting times while yielding significant enhancements in both compressive and tensile strengths. More precisely, the compressive strength experiences an increase from 16 MPa to 35 MPa, while the splitting tensile strength rises from 1.3 MPa to 2.6 MPa as the amount of RHA increases. The changes are caused by the large surface area and water absorption qualities of RHA, which affect the consistency and curing characteristics of the mixture. Although there have been significant improvements in the mechanical qualities, the reduced workability and shorter setting periods pose issues that require more investigation. The study highlights the potential of RHA as an environmentally friendly addition, providing a sustainable option to traditional materials and aiding in reducing building waste. Suggestions for future research encompass enhancing the RHA composition to achieve a harmonious blend of mechanical performance and workability, examining the long-term durability and environmental resistance, establishing standardized production procedures, exploring other industrial by-products, and conducting thorough assessments of the life cycle and economic aspects. By focusing on these specific areas, the development of RHA-enhanced GPC will be promoted, facilitating its incorporation into sustainable building methods and improving its overall effectiveness and environmental footprint.
Review Paper on Geopolymer Concrete by using GGBS and Rice Husk Ash
International Journal for Research in Applied Science and Engineering Technology, 2020
This paper outlines the use of industrial products such as ground granulated blast furnace slag (GGBS) and rice husk ash (RHA) for the construction of sustainable geopolymer concrete. This item is a matrix compound consisting of GGBS and Rice Husk, with great durability. Due to the presence of GGBS and Rice Husk, the potential for concrete cracking is increasing. Geopolymer cement is replaced by cement, Ground Granulated Blast-furnace Slag (GGBS) and Rice Husk Ash (RHA) were added during the concrete mix. However, the RHA has the potential to be used as a source material in Geopolymer concrete as the RHA is a pozzolanic material containing about 85-90% of silicon dioxide (SiO2). This paper briefly reviews the work carried out by various researchers & scientists on RHA based Geopolymer concrete as well as focuses on sustainable utilization and potential benefits of using RHA in the field of Geopolymer concrete.
Performance of Rice Husk Ash in Geopolymer Concrete
Environmental issues resulted from cement production have become a major concern today. To develop a sustainable future it is encourage to limit the use of this construction material that can affect the environment. Geopolymer is the best solution reduce the use of cement in concrete. Geopolymer is the hardened cementious paste made from fly ash, alkaline solution and geological source material.Fly ash is finely divided powder produced by coal and fired power station .RHA is the bye-product of paddy industry. RHA is rich in silicaabout 90%, 5% carbon and 2% K2O. The specific surface area of RHA is about 40-100 m2/g. As per study it is found that incorporation of RHA upto 30% replacement level reduces the chloride penetration, decreases permeability and strength and corrosion resistance properties.
Research on Engineering Structures and Materials
In this study, Geopolymer concrete (GPC) blended with fly ash (FA), ground granulated blast furnace slag (GGBS), rice husk ash (RHA), and nano-silica (NS) developed and investigated in three aspects: In the first aspect of GPC (FA+GGBS), FA varied from 0-100% of GGBS at 10 % intervals to determine the optimum proportion of FA-GGBS. In the second aspect of GPC (FA+GGBS+RHA), RHA varied from 0-25% of FA at 5% intervals with a constant of 30% GGBS attained from the first aspect of the study. In the third aspect of GPC (FA+GGBS+RHA+NS), NS was replaced with 1, 3, and 5% with the optimum proportions of GGBS (30%) and RHA (15%) obtained from the first and second aspects of the study. The fresh and hardened properties of GPC were obtained at 7 and 28 days under ambient curing. The compressive strength improved while FA was replaced by GGBS (0-100%) from 27.75 to 45 MPa. Meanwhile, workability has decreased to 0.81 from 0.97. Hence, the optimized proportion of FA and GGBS was obtained as 70...
Geopolymer concrete: effect of husk ash to compression and its microstructure properties
2017
This research focuses on determination of cement-free geopolymer concrete capacity as an alternative to Ordinary Portland Cement concrete (OPC) for in-situ casting and the effect of utilizing waste material in polymeric concrete. pulverized fuel ash (PFA) is used as the main constituent and MIRHA as replacement by 0%, 3%, 5% and 7%. Sodium hydroxide and sodium silicate solution are used as alkali activators of silica (Si) and aluminium (Al) in main binders while sugar is added to delay the setting time of the polymeric concrete. The polymeric concrete samples are exposed to three different curing regimes namely hot gunny sack curing, ambient temperature curing and external exposure curing. Compressive strength test is carried out in 3, 7, 28 and 56 days to identify the strength of the polymeric concrete. Scanning Electron Microscopy (SEM) analysis is done to ascertain the microstructure properties of the produced polymeric concrete.
Experimental study: Alccofine as strength enhancer for geopolymer concrete
International Journal of Advance Research, Ideas and Innovations in Technology, 2019
Concrete is the most consumptive material after water in the world because of its strength and durability. But the production of cement depends on natural resources and emits a huge amount of carbon dioxide into the atmosphere. For the sustainable environment and to reduce the global warming caused by the carbon dioxide emitted by the cement industry new substitutes which are eco-friendly is the need of the hour. Geopolymer concrete also is known as green concrete or cementless concrete produced by 100% replacement of cement with the waste product obtained from the industries. Geopolymer concrete uses fly ash, slag, and rice husk as a binder which is a substitute for conventional concrete. In present work, the different trail mixtures with variation in Alccofine were prepared to check the workability, compressive strength and permeability of Geopolymer concrete. Variation in content of Alccofine is done as 0%, 10%, 20%, 25% and 30%. As arccosine is an admixture which is micro-fine in its structure, so it may affect the fresh and hardened properties of Geopolymer concrete. In the study, results show that with an increase in the content of Alccofine up to 25% the significant increase in the compressive strength of concrete can be gained.
Influence of Alkali Concentrations on the Mechanical Properties of Geopolymer Concrete
2018
Geopolymer concrete is an innovative alkali-activated concrete that has been gaining applications due to its higher strength and excellent durability. In this paper, utilization of ground granulated blast furnace slag (GGBFS) and corncob ash (CCA) is investigated as source materials. The source materials were activated with the solutions of sodium hydroxide (NaOH) and sodium silicate (Na2SiO3) for the production of geopolymer concrete (GPC). Sodium hydroxide was prepared in 12 Molar, 14 Molar, and 16 Molar concentrations while grade 30 (M30) concrete was used as mix design proportion. Ground granulated blast furnace slag was substituted by CCA in 20%, 40%, 60%, 80% and 100%, while compressive strength, flexural strength, and split tensile strength were tested and cured in ambient conditions, and compared with Portland cement concrete (PCC). The findings reveal that 14 molar exhibits the best concentration for the activation of GGBFS-CCA based GPC having maximum compressive strength ...
Utilizing Fly Ash And Rice Husk Ash In Geopolymer Concrete: A Comparative Performance Study
Environmental concerns stemming from cement production have emerged as a significant issue today. In pursuit of a sustainable future, there is a growing importance on reducing the use of this construction material due to its environmental impact. Geopolymer represents a promising alternative to traditional cement. Geopolymer concrete (GPC) is a hardened cementitious paste composed of alkaline solution, fly ash, fine and coarse aggregates. This research focusedto assessthe impact of utilizing rice husk ash (RHA) as a partial replacement of FA in GPC. The addition of RHA, serving as a source of silica, significantly influenced the strength of GPC. 1 The research discovered that the suitability of GPC diminishes as the amount of RHA increases, although it still stays within acceptable bounds. The inclusion of RHA in GPC resulted in higher compressive strength, tensile strength, and flexural strength. Also, the inclusion of RHA was found to be increased the acid resistance of GPC. Higher silica content correlates with increased strength and enhanced durability.
Development of High Strength Fly Ash based Geopolymer Concrete with Alccofine
IOSR Journal of Mechanical and Civil Engineering, 2016
The production of Ordinary Portland cement concrete causes havoc to the environment due to the emission of CO 2 in the production of cement as well as mining which results in unrepairable damage to nature. Geopolymer concrete, a cement free concrete is an innovative green concrete 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. Geopolymer concrete develop high compressive strength on heat curing promising to be an ecofriendly substitute for ordinary Portland cement concrete in some applications. This paper briefly put the light on the development of high strength geopolymer concrete with the help of Alccofine which is a micro fine GGBS based material.
2017
Geopolymer concrete was developed with the intention to protect the environment from the carbon dioxide which liberates to the environment, as well as nature is harmed. However, geopolymer concrete had a severe limitation that silica of fly ash, which was activated through thealkalinesolution, could achieve required compressive strength only at high temperature. In the present investigation alccofine which is richer in silica and finer than fly ash has been added up to 10% of fly ash and geopolymer concrete with different fly ash content has been produced. The results are encouraging, as required compressive strength even 40MPa could be achieved at ambient temperature. Compressive and tensile strength have increased with increase in fly ash and alccofine content. The strength further increased significantly up to 90% in the presence of alccofine. Attempts were further made to relate the compressive and tensile strengthin the presence of alccofine. A relationship has been suggested w...