The gpc beam, on the other hand, experienced an abrupt drop in load resistance after peak. Geopolymer concrete also showed very high early strength. Shear strength of geopolymer concrete beams using high. Fly ash based geopolymer concrete open access journals. In this regard, geopolymer concrete gpcs can be considered as. The research report describes the structural behavior of geopolymer concrete beams and columns. Pdf geopolymer binders offer a possible solution for several problems that facing the. Details of the beams four reinforced concrete beams that were 10 ft. This paper presents the results of this study, which sought to obtain answers about the mechanical behavior of the geopolymer in precast reinforced concrete beams.
What can be done about the major concerns of our global economy on energy, global warming, sustainable development, userfriendly processes, and green chemistry. The present study investigates the setting and strength properties of geopolymer mixtures containing binary combinations of bentoniteflyash, bentonitecement, bentonitesilicafume and ternary blends of bentoniteflyashlime. The paper describes the results of the tests conducted on largescale reinforced geopolymer concrete members and illustrates the application of the geopolymer concrete in the construction industry. Figure 2 shows that, for a 45 mpa concrete, the alkaline liquid requirements are lower when the fly ash content is 320 kgm3 and. Cracking behavior of geopolymer concrete beams reinforced. The beams are cast over an effective span of 3000 mm and tested up to failure under static. Concrete is the most widely used construction material which required large quantities of portland cement. Concrete compressive strength had a significant effect on. Experiments are conducted on 12 gpc beams and four opcc control.
In the present study metakaoline and ground granulated blast furnace slag ggbs is used to convey geopolymer concrete. The material used for the preparation of geopolymer concrete beam are sodium hydroxide, sodium silicate, class f flyash. Predictions of longterm deflection of geopolymer concrete beams, construction and building materials, 94, pp. The results indicate that geopolymer provides excellent adhesion both to concrete surface and in the interlaminar planes of fabrics. In this paper, fly ash is used to produce a geopolymer concrete. Retrofitting of geopolymer beam using carbon fibre mat. Geopolymer concrete of m50 grade was proposed to be produced using flyash and metakaolin instead of cement. In brazil, however, this knowledge gap remained the longest, when a ph. Pdf shear behaviour of geopolymer concrete beams without. The present investigation obtains the flexural capacity and behaviour of gpc and ordinary portland concrete beams reinforced with gfrp bars gfrprgpc and.
Behaviour of geopolymer reinforced concrete beams free download as powerpoint presentation. This paper deals with the behavior of a geopolymer concrete beam gcb under shear load using high calcium content fly ash fa. The deflection of all the beams until the initiation of. The flexural strength of geopolymer concrete by the use of simple beam prisms with third point loading, this procedure is commonly referred to as modulus of rupture. The results showed that the gfrp web reinforcement doubled both the shear strength and deflection capacities of the beam without stirrups. Alklai solutions sodium hydroxide naoh, sodium silicate. Flyash and msand based geopolymer concrete beams fly. Fly ash, a by product of coal obtained from the thermal power plant is plenty available. The geopolymer concrete beams were cast and tested, based on the results the moment curvature and loaddeflection relationships were obtained using deflection measurements from lvdts and strain data collected for the normal concrete sleeper and geopolymer concrete. Structural behaviour of geopolymer concrete beams and. The fly ashbased geopolymer paste binds the loose coarse aggregates, fine aggregates and other unreacted materials together to form the geopolymer concrete, with the presence of admixtures. Geopolymer concretes gpcs are new class of building materials that have emerged as an alternative to ordinary portland cement concrete opcc and possess.
Geopolymer concrete shall be produced without using any amount of ordinary portland cement. Geopolymer is an inorganic aluminosilicates polymer synthesized from minerals of geological origin or byproducts materials, such as fly ash, blast furnace slag etc. Pdf flexural behaviour of geopolymer concrete beams. Flyash and msand based geopolymer concrete beams free download as powerpoint presentation. The geopolymer concrete beams with gfrpsteel hybrid reinforcement showed less severe and more ductile failure with ample prior warning and a higher number of flexural cracks that were closely spaced compared to the beams with gfrp bars alone. Geopolymer concrete beams with low rebar ratio recorded significant deformation. Physical nonlinearity of precast reinforced geopolymer. The shear behaviour of geopolymer concrete beams reinforced with gfrp stirrups at different spacing was investigated in the third stage. Strengthening of plain concrete beams using strain. Some recent applications of geopolymer concrete in the precast construction and. Twelve reinforced concrete beams of size 700 mm x 150 mm x 150 mm were tested. Geopolymer concrete was prepared with the use of alkaline.
Pdf a mix design procedure for geopolymer concrete with. The production of ordinary portland cement causes pollution to the environment, due to the emission of co 2 and also large amount of natural. Shear strength of fly ashbased geopolymer reinforced concrete beams. Flexural response of geopolymer and fiber reinforced. Flexural strength of geopolymer concrete beams in sea water environment. Geopolymer based cementitious binder is one of the recent findings in the emerging concrete technology. Establishing a mix design procedure for geopolymer concrete. The aim of the paper is to evaluate the flexural strength of geopolymer concrete beam with carbon fibre reinforced polymer cfrp wrapping tension side and to validate with control beam. Flexural strength and failure of geopolymer concrete beams. This paper presents the experimental investigation done on flexural behavior of reinforced geopolymer concrete. Tech structures thesis presentation on geopolymer concrete. Geopolymer for repair and rehabilitation of reinforced.
Few studies deal with the combination of these materials. Geopolymer concrete gpc with glass fibrereinforced polymer gfrp bars can provide a better construction system with high sustainability, high durability, and adequate strength. 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. Development of high volume fly ash hvfa concrete development of geopolymer concrete. Flexural response of gfrpreinforced geopolymer concrete. Department of civil engineering, college of engineering, university of basrah, basrah, iraq. The fly ash based geopolymer concrete was prepared with bagasse ash and metakaolin which were used to replace fly ash at different percentages i. This dissertation addresses this requirement for a standard mix design for geopolymer concrete.
The molarity used for the preparation of geoploymer specimens was 12. Shear strength of fly ashbased geopolymer reinforced. Similarly the fibre reinforced geopolymer concrete showed good workability as of the ordinary portland cement. Flexural behaviour of reinforced geopolymer concrete beams. Author links open overlay panel khuram rashid a b xiaoda li a yan xie a jun deng a faji zhang a. The grades choosen for the investigation were m30, m40 and m50.
Geopolymer is a material resulting from the reaction of a source material that is rich in. This study investigated the flexural response of glass fibre reinforced polymerreinforced geopolymer concrete gfrprgc beams using a fourpoint static bending test. A concrete use around the world is second only to water. Present investigation embodies the flexural behavior of geopolymer concrete gpc beams cured under ambient temperature. The beams had 0, 2, 3 and 5 layers of unidirectional carbon fabrics attached at the tension face of the beams. All the four beams were tested as simply supported beams under four point loading. This paper presents a study of the flexural strength of geopolymer concrete beam using high calcium content fly ash fa in marine environment, without high heat curing. This chapter describes the mix design and manufacturing process of geopolymer concrete. Earth friendly concrete efc is a proprietary geopolymer concrete developed by the australian company wagners that is a viable and sustainable alternative to portland cement based systems.
School of environment and technology, university of brighton, moulsecoomb, brighton bn2 4gj, uk. However, after the peak, the frgc beams due to the presence of discrete fibers continued to sustain loads although at slightly lower values. Geopolymer concrete for durable linings tunneltalk. The flexural behaviour of geopolymer concrete gpc beams and control cement concrete beams are studied. The compressive strength of geopolymer concrete is about 1. Final report on behaviour of geopolymer concrete 1. Geopolymer concrete is an innovative construction material which shall be produced by the chemical action of inorganic molecules. Strengthening of plain concrete beams using strain hardening geopolymer composites shgc layers. Geopolymer bond is set up by using dissolvable course of action of sodium silicate and sodium hydroxide. Advantages and disadvantages of geopolymer concrete geopolymer concrete is considered to be an innovative material that is a viable alternative to traditional portland concrete or cement used in transportation infrastructures, certain constructions and offshore builds. The manufacture of geopolymer concrete is carried out using the usual concrete technology methods as in the case of opc. The production of ordinary portland cement contributes 57% of total green house gas emission. The details of the beams and experimental procedures are presented in the following sections. Opc usage without environmental impact why geopolymer concrete.
Pdf mix design of fly ash based geopolymer concrete. Geopolymer concrete are a class of new concretes based on an ecofriendly nonportland cement based binder system derived from geological materials rich in silica and alumina. Free download of chapter 1 of geopolymer chemistry and applications 1 mb in pdf format. N lakshmanan, former director and presently project advisor structural engg research centre, chennai, and nataraja m c, professor, sj college of engg, mysore. In case of fly ash based geopolymer concrete as there is no cao content so curing takes place due to polymerization process, but with the addition of ggbs in fly ash. Figure 3 shows the of loaddeflection behaviour of geopolymer concrete beams and conventional concrete beams with different reinforcement ratios.
Flexural capacity and behaviour of geopolymer concrete. The shear behavior of reinforced geopolymer concrete beams was investigated. Pdf flexural behaviour of reinforced geopolymer concrete. Two series of beam specimens were loaded to failure to study the effect of chloride environment on the flexural strength of geopolymer concrete beams. Flexural response of gfrpreinforced geopolymer concrete beams. From the figure the following observations can be made. As per the present world statics, every year million tons of cement are. Geopolymer concrete a new ecofriendly material of construction n. Cracking behavior of geopolymer concrete beams reinforced with steel and fiber reinforced polymer bars under flexural load.