Geopolymer binders can provide comparable performance to traditional cementitious binders in a. A logical solution, therefore, is to combine gfrp bars and geopolymer concrete to. This component of geopolymer concrete mixtures can be designed using the tools currently available for portland cement concrete. Reinforced geopolymer cement concrete in flexure semantic scholar. Pdf this paper describes the experimental studies on flexural behaviour reinforced. The reinforced concrete beams are designed primarily for flexural strength and shear strength. In the construction industry mainly the production of portland cement will causes the emission of. Kanta rao abstract the major problem the world is facing today is the environmental pollution. For the study of shear behaviour of geopolymer concrete beams, a total of nine beam. Report date april 2001 the flexural capacity of reinforced concrete beams 6. In the geopolymer concrete, the diverse centralization of sodium hydroxide, for example, 8, 10, 12, 14, 16, 18, and 20. Experimental and analytical investigations on shear behaviour of reinforced geopolymer concrete beams ambily.
Udhaya kumar assistant professor, department of civil engineering, veltech rangararajan dr. R international journal of civil and structural engineering volume 2 issue 3 2012 818 formation in geopolymer concrete sofi, d et al. The flexural behaviour of geopolymer concrete beams reinforced with gfrp. Three fullscale geopolymer concrete beams were cast and tested.
Use of carbon fiber reinforced polymer composites to. Envelope curves were obtained by joining the peak points of all the cycles. Fresh concrete mix 100 200 mm steel cylindrical mould in three layers. The fracture energy of concrete is generally believed to be governed by the microstructure of the paste and the size, texture and angularity of.
They concluded that geopolymer concrete can be successfully used to bond carbon fabrics to reinforced concrete beams. The geopolymer concrete was dark in colour with shiny appearance. Four reinforced concrete beams that were similar to the ones reinforced with carbon fabrics and organic adhesives were tested. Pdf effect on flexural strength of reinforced geopolymer concrete. Past studies of the structural behaviour of reinforced fly ashbased geopolymer concrete members have covered the flexural behaviour of members. The beams were designed as under reinforced w ith tensile. Techbrief briefly describes geopolymer concrete materials and explores some of their strengths, weaknesses, and potential applications. Seismic behavior of beam column joints in reinforced. This material is being studied extensively and shows promise as a greener substitute for ordinary portland cement concrete in some applications. Flexural response of gfrpreinforced geopolymer concrete. Various salient parameters that influence the compressive strength of geopolymer concrete were investigated. Research is shifting from the chemistry domain to engineering applications and commercial. Figure 7 shows that the geopolymer concrete possesses a lower fracture energy than the opc concrete, and the measured g f values fall below the value predicted by the cebfip relationship equation 11.
Four geopolymer concrete beams and four opc concrete counterparts with the same. Properties of geopolymer concrete with low calcium fly ash. Efc commercial scale geopolymer concrete over the past 10 years, australian construction materials company, wagners, have developed a truly commercial form of geopolymer concrete that is totally portland cement free and a complete replacement for conventional concrete. In manual operation the sieves is jolted giving movements all told attainable directions. Shear and bond behaviour of reinforced fly ashbased geopolymer concrete beams ee hui chang this thesis is presented for the degree of doctor of philosophy of curtin university of technology. The fly ash based geopolymer concrete was prepared with bagasse ash and metakaolin which were used to replace fly ash at different percentages i. Analysis of geopolymer concrete columns springerlink. What has been missing is the combination of this research in a way that would allow use of geopolymer concrete as a replacement to concrete based on ordinary portland cement. Shear strength of geopolymer concrete beams using high.
Geopolymer is a type of amorphous aluminohydroxide product that exhibits the ideal properties of rockforming elements, i. Physical nonlinearity of precast reinforced geopolymer concrete beams. Experimental study on geopolymer concrete incorporating ggbs v. Behavior of geopolymer and conventional concrete beam column. The beams were longitudinally reinforced at the bottom with 412. Pdf mix design of fly ash based geopolymer concrete. This dissertation addresses this requirement for a standard mix design for geopolymer concrete. Beams are structural members used to carry loads primarily by internal moments and shears. Physical nonlinearity of precast reinforced geopolymer concrete. Alternative binder system with fly ash to produce concrete eliminating cement is called geopolymer concrete. Geopolymer concrete shall also be used in the infrastructure works.
Predictions of longterm deflection of geopolymer concrete beams, construction and building materials, 94, pp. Geopolymer binders are used together with aggregates to produce geopolymer concrete which is an ideal building material for. This paper concentrates on low calcium fly ash based geopolymer concrete. Fly ashbased geopolymer concrete curtin university. N lakshmanan, former director and presently project advisor structural engg research centre, chennai, and nataraja m c, professor, sj college of engg, mysore. Figure 1can be used to bind loose aggregates and other nonreacted materials together to form geopolymer concrete shown in figure 26. Geopolymers, an unique class of inorganic polymers are new promising binders and are manufactured by. The results indicate that geopolymer provides excellent adhesion both to concrete surface and in the interlaminar planes of fabrics. Ordinary portland cement opc has been traditionally used as the binding agent in concrete. S international journal of civil and structural engineering volume 2 issue 2 2011 676 resistance type strain gauges for were fastened at the mid span longitudinal tension steel, a. The primary objective of the investigation was to determine whether geopolymer can be used that not for repair of concrete. The geopolymer concrete shall be effectively used for the beam column junction of a reinforced concrete structure. The compressive strength and the workability of geopolymer concrete are influenced by the proportions and properties of the constituent materials that make the geopolymer paste.
Use of carbon fiber reinforced polymer composites to increase 5. Geopolymer concrete combines an alkaline liquid with a geological source material containing silicon and aluminum to form a binder that does not use any portland cement. The previous research on fly ashbased geopolymer concrete conducted by authors studied the shortterm and the longterm properties. Geopolymer, also known as inorganic polymer, is one such material that uses byproduct material such as fly ash instead of cement. The manufacture of geopolymer concrete is carried out using the usual concrete technology methods. Four geopolymer concrete beams and four opc concrete. The objectives of this paper are to present the results of study on the behaviour and strength of fly ashbased geopolymer reinforced concrete structural members such as beams and columns through experimental and analytical works. Effect on flexural strength of reinforced geopolymer concrete beams by using ggbs. A blend of sodium silicate arrangement and sodium hydroxide arrangement. Pdf flexural behavior of geopolymer concrete beams with ggbs. Strength and durability properties of alkali activated. Flexural behaviour of combined faggbfs geopolymer concrete. Shear reinforcements in the reinforced concrete beams.
Geopolymer concrete a new ecofriendly material of construction n. James aldred1,2, john day3 4and tom glasby 1 technical director, aecom 2 adjunct assoc. Geopolymer concrete for repair and rehabilitation of reinforced concrete beams. Pdf fibers study on properties of geopolymerconcrete. Experimental study on geopolymer concrete incorporating. International journal of pure and applied mathematics.
Geopolymer results from the reaction of a source material that is rich in silica and alumina with alkaline liquid. Geopolymer concrete is formed with same combine proportion employed in m twenty, m forty and m sixty grade standard cement concrete is. Concrete obtained from geopolymer known to exhibit many excellent properties such as high compressive strength, low creep, good acid resistance and low shrinkage. This value is similar to that used in opc concrete in which it will be in the range of 75 to 80% of the entire mixture by mass. A total of twenty beams consisting of twelve gpc beam specimens and e ight pcc beam specimens were considered in this study. One of the main objectives of the design of reinforced concrete beams is safety. The beams had 0, 2, 3 and 5 layers of unidirectional carbon fabrics attached at the tension face of the beams.
The most potential source of geopolymers among the industrial waste or byproduct materials, are fly ash and blast furnace slag. Pdf the production of ordinary portland cement opc emits co 2 into the atmosphere. Twelve reinforced concrete beams of size 700 mm x 150 mm x 150 mm were tested. The geopolymer concrete was placed in 100 mm cube moulds. Mixing of geopolymer concrete the fly ash, fine aggregates and coarse aggregates were mixed in a container and then the alkaline solution was added to prepare the geopolymer concrete. Flexural response of geopolymer and fiber reinforced. Sudden failure due to shear low strength is not desirable mode of failure. Geopolymer concrete gpc then appeared as one of the most important inventions in the concrete industry for reducing carbon dioxide emissions in civil engineering activities. Establishing a mix design procedure for geopolymer concrete.
This can be observed from geopolymer expansion which is lower than 0. Experimental investigation and analytical modeling of reinforced geopolymer concrete beam uma. Meher prasad 2 1 project officer, department of civil engineering, iit madras, india 600 036 2 professor, department of civil engineering, iit madras, india 600 036 abstract the beam column joint is the crucial zone in a reinforced concrete moment resisting. Manufacture of fullscale geopolymer cement concrete. Blending is accomplished for 5 minutes to get uniform blend. Jayadurgalakshmi assistant professor, department of civil engineering, veltech rangararajan dr. 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. Similar to the sulfate aggression on geopolymer concrete mass, the dimension of geopolymer concrete is extremely low. However, after the peak, the frgc beams due to the presence of discrete fibers continued to sustain loads although at slightly lower values. Experimental and analytical investigations on shear. However, it is also necessary to search for alternative lowemission binding agents for concrete to reduce the environmental impact caused by manufacturing of cement. Experimental investigation and analytical modeling of. The meshed model of the bea m specimen is shown in figure 3. The gpc beam, on the other hand, experienced an abrupt drop in load resistance after peak.
Because the chemical reaction that takes place is a polymerization process, the material is called a geopolymer. Geopolymer bond is set up by using dissolvable course of action of sodium silicate and sodium hydroxide. Fracture properties of geopolymer paste and concrete. Geopolymer materials represent an innovative technology that is generating considerable interest in the construction industry, particularly in light of the ongoing emphasis on sustainability. Present investigation embodies the flexural behavior of geopolymer concrete gpc beams cured under ambient temperature. In the present study metakaoline and ground granulated blast furnace slag ggbs is used to convey geopolymer concrete. The binder in efc is made by the chemical activation of two. Geopolymer concrete was prepared with the use of alkaline. Geopolymer is produced from a geopolymerization process involving aluminosilicate materials such as. Shear and bond behaviour of reinforced fly ashbased.
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