scholarly journals FLEXURAL BEHAVIOR OF FLY-ASH BASED GEOPOLYMER CONCRETE BEAM AND ITS POTENTIAL FOR STRUCTURAL MEMBERS

2021 ◽  
Vol 86 (786) ◽  
pp. 1202-1212
Author(s):  
Atsushi SHIBAYAMA ◽  
Minehiro NISHIYAMA
Keyword(s):  
Fly Ash ◽  
Concrete Beam ◽  
Flexural Behavior ◽  
Geopolymer Concrete ◽  
Structural Members

Application of Fly Ash-Based Geopolymer for Structural Member and Repair Materials

2014 ◽  
Vol 92 ◽  
pp. 74-83 ◽  
Author(s):  
Wanchai Yodsudjai
Keyword(s):  
Reinforced Concrete ◽  
Fly Ash ◽  
Concrete Beam ◽  
Setting Time ◽  
Reinforced Concrete Beam ◽  
Structural Member ◽  
Steel Reinforcement ◽  
Flexural Behavior ◽  
Fundamental Properties ◽  
Repair Materials

The applications of using fly ash-based geopolymer as a structural member and a repair materials in reinforced concrete structure was conducted. The optimum mix proportion of fly ash-based geopolymer concrete using for structural beam and fly ash-based geopolymer mortar using for repair material were developed. The flexural behavior of fly ash-based geopolymer reinforced concrete and the durability aspect namely the corrosion of steel reinforcement were investigated using the electrical acceleration. For the repair purpose, the fundamental properties; that is, compressive strength, flexural strength, bonding strength between fly ash-based geopolymer mortar and mortar substrate, setting time and chloride penetration were investigated. Also, the durability of conventional reinforced concrete beam repaired by the fly ash-based geopolymer mortar comparing with the comercial repair mortar was investigated. The behavior of the fly ash-based geopolymer reinforced concrete beam was similar to that of the conventional reinforced concrete beam; however, the corrosion of the steel reinforcement of the fly ash-based geopolymer reinforced concrete beam was higher than that of the conventional reinforced concrete beam. The fundamental properties of the fly ash-based geopolymer mortar were not different from that of the commercial repair materials; however, the durability of the reinforced concrete beam repaired by the fly ash-based geopolymer mortars performed a little lower than that of repaired with the commercial repair motar and also the control reinforced concrete with no repair. As a result, even there will be still a need of improvement there was a good tendency for using the fly ash-based geopolymer as the structural member and the repair materials.

scholarly journals Structural Behaviour Fly ash and Ferrochrome ash Based Geopolymer Concrete with Recycled Aggregate

2019 ◽  
Vol 8 (4) ◽  
pp. 9329-9335
Keyword(s):  
Reinforced Concrete ◽  
Fly Ash ◽  
Carbon Footprint ◽  
Concrete Beam ◽  
Coarse Aggregate ◽  
Reinforced Concrete Beam ◽  
Recycled Aggregate ◽  
Recycled Aggregates ◽  
Geopolymer Concrete ◽  
Structural Behaviour

Recycled aggregates are the construction demolition wastes which can be used in concrete industry to reduce the carbon footprint of the environment. This paper deals with the structural behaviour of reinforced concrete beam made with different percentages of recycled aggregate as coarse aggregate on a novel geopolymer concrete consist of fly ash and ferrochrome ash as binder. Structural behaviour of RCC beam with 10% and 20% recycled aggregate in geopolymer concrete are studied and compared to the 100% natural coarse aggregate. Experimental results revealed that the up to 10% replacement of recycled aggregate can achieve strength equal to control concrete and it can be the recommended percentage of RCA for concrete industry.

scholarly journals A Review on Flexural Behavior of RCC Beams Made with Geopolymer Concrete

2020 ◽  
Vol 184 ◽  
pp. 01096
Author(s):  
Dr. T. Srinivas ◽  
S. V. Srinidhi ◽  
Dr. N.V. Ramana Rao
Keyword(s):  
Carbon Dioxide ◽  
Fly Ash ◽  
Flexural Behavior ◽  
Geopolymer Concrete ◽  
Major Drawback ◽  
Flexural Mode ◽  
Granulated Blast Furnace Slag ◽  
Life Threatening ◽  
And Control ◽  
Furnace Slag

In the process of production of concrete, the emission of carbon dioxide has become a life-threatening issue and a major drawback towards sustainable development, as there is need to reduce and control this carbon dioxide. It is therefore essential to find a substitute greener material to the existing OPC concrete. Since its significant minor carbon footprint and with usage of industrial by-products, which includes fly ash and ground granulated blast-furnace slag in geopolymer concrete is recognized as a sustainable substitutes. Fly ash is well-off in silicate and alumina, hence it reacts with alkaline solution to generate alumina silicate gel that binds the aggregate to manufacture a good quality concrete. Literature on the flexural behavior of geopolymer concrete (GPC) beams have been studied and compared with the reference concrete beams of the respective grade. From the literature, It has been observed that the development of flexural cracks are relatively less in geopolymer RCC beams compared to conventional beams, the failure occurred in the beams was in flexural mode and the cracks are generated from the tension zone to the compression zone and also the compressive strength greater than before due to decrease in porosity, as the fineness of fly ash enhanced.

scholarly journals Experimental Study on the Flexural Behavior of Alkali Activated Fly Ash Mortar Beams

2020 ◽  
Vol 10 (12) ◽  
pp. 4379 ◽  
Author(s):  
Adelino V. Lopes ◽  
Sergio M. R. Lopes ◽  
Isabel Pinto
Keyword(s):  
Experimental Study ◽  
Fly Ash ◽  
Portland Cement ◽  
Flexural Behavior ◽  
Test Results ◽  
Structural Members ◽  
Practical Application ◽  
Simply Supported ◽  
Alkali Activated ◽  
Potential Use

This work aims to study the possibility of using alkaline activated fly ash in structural members. The work, of an experimental nature, focuses on the evaluation of the behavior of simply supported beams under two symmetrical loads (four-point tests). For such study, 10 beams were built, of which, five using fly ash and the remaining five using traditional Portland cement. The test results are compared. Conclusions on the practical application of fly ash in structures were explained and, as mention later in this document, there is room for improvement. This is one of very few works on fly ash alkali activated structures and further studies are necessary in the future. Some aspects, such as shrinkage and deformability are presented as some of the negative points concerning the potential use of fly ash. These are two aspects that need more attention in future investigations.

Numerical Investigation of a Hybrid FRP-Geopolymer Concrete Beam

2016 ◽  
Vol 846 ◽  
pp. 452-457
Author(s):  
Zong Jun Li ◽  
Amar Khennane ◽  
Paul Jonathan Hazell
Keyword(s):  
Experimental Data ◽  
Finite Element ◽  
Finite Element Model ◽  
Numerical Investigation ◽  
Concrete Beam ◽  
Element Model ◽  
Flexural Behavior ◽  
Geopolymer Concrete ◽  
Hybrid Beam ◽  
Non Linear

Over the past years, numerical investigations have gained more attention and success in analysing the overall performance of hybrid FRP-concrete structures in civil engineering applications. In this study, a hybrid FRP-geopolymer concrete beam, which consists of high-strength geopolymer concrete filled into a rectangular hollow section pultruded GFRP profile, has been investigated numerically using the commercial software ABAQUS. A non-linear finite element model has been developed to simulate the flexural behavior of this hybrid beam under four-point static loading. Different material models were employed to describe the materials used for the hybrid beam members. The numerical results including the flexural capacity and load deflection curves are compared and verified with published experimental data from literature. The determination of dilation angle of geopolymer concrete and the effect of mesh dimensions are also compared and reported in this study. A reasonable agreement between experimental data and the numerical result is obtained, which indicates the finite element model developed in this numerical investigation is able to predict the non-linear behavior of this hybrid beam.

scholarly journals Effect of sugarcane bagasse fibre on the flexural behavior of geopolymer concrete RCC beams

2021 ◽  
Vol 309 ◽  
pp. 01113
Author(s):  
Srimanthula Chandana ◽  
T. Srinivas ◽  
N V Ramana Rao
Keyword(s):  
Fly Ash ◽  
Sugarcane Bagasse ◽  
Peak Load ◽  
Coal Industry ◽  
Flexural Behavior ◽  
Geopolymer Concrete ◽  
Conventional Concrete ◽  
Service Load ◽  
Sugarcane Bagasse Ash ◽  
Bagasse Fibre

CO2 is released into the atmosphere during the manufacture of Ordinary Portland Cement (OPC). Fly ash, a by-product of the coal industry, is used to replace OPC in concrete. It contains a lot of silicate gel and is mixed with an alkaline solution to make good concrete. Increased fly ash fineness improves compressive strength while lowering porosity. Advances in modern bio technology is possible freedoms for monetary use of agro-mechanical deposits like sugarcane bagasse ash and fibre. The flexural behaviour of Geopolymer Concrete RCC beams with and without sugarcane bagasse fibre, i.e. GPC and GPCF of G 40 grade, equal to M40, is presented in this study. The 150*150 mm beam is cast across a 1,200 mm effective span and tested for failure under static loads. The ultimate load and load displacement responses of GPC structural elements with and without fibre are measured and compared to normal GPC and conventional concrete elements. The findings suggest that SCBF improves the flexural strength, service load, and peak load of GPC elements.

Review on Experimental Study on Effect of Corrosion In Reinforced Concrete Fly-Ash Beam

2020 ◽  
pp. 92-96
Author(s):  
Shubham N. Dadgal ◽  
Shrikant Solanke
Keyword(s):  
Fly Ash ◽  
Bond Strength ◽  
Structural Damage ◽  
Pullout Test ◽  
Partial Replacement ◽  
Structural Members ◽  
Accelerated Corrosion ◽  
Resistivity Method ◽  
Electrical Resistivity Method ◽  
Structural Failures

In modern days for structures in coastal areas it has been observed that the premature structural failures are occurs due to corrosion of the reinforcements of the designed structural member. The corrosion causes the structural damage which in turn leads to reduction in the bearing capacity of the concerned structural members. The aim of this study was to study the effect of partial replacement of fly ash to minimize the corrosion effect. Beams were designed and corroded by using artificial method known accelerated corrosion method. The beams were then tested for flexural and bond strength. Also the weight loss of the reinforced bars was been determined using electrical resistivity method. The fly ash will replace by 10% and 15%.The strength will calculate at varying percentage of corrosion at 10% and 15%. Beams will cast at M25 grade concrete. The flexural strength will test by using UTM and the bond strength will calculate using pullout test.

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