Flexural Behaviour of GGBS-Dolomite Geopolymer Concrete Beams under Cyclic Loading

2019 ◽  
Vol 969 ◽  
pp. 291-296 ◽  
Author(s):  
P. Saranya ◽  
Praveen Nagarajan ◽  
A.P. Shashikala ◽  
Abdu P. Salam
Keyword(s):  
Cyclic Loading ◽  
Concrete Beams ◽  
Volume Fraction ◽  
Concrete Strength ◽  
Base Material ◽  
Geopolymer Concrete ◽  
Steel Fibres ◽  
Granulated Blast Furnace Slag ◽  
Flexural Member ◽  
Crushing Plant

Geopolymer concrete (GPC) is the most advanced form of concrete amongst the various types of concrete developed so far. This paper aims at investigating the feasibility of using Ground Granulated Blast furnace Slag (GGBS) as a base material for geopolymer concrete. Effect of dolomite, which is a by-product from rock crushing plant on GGBS based GPC, was studied. Maximum compressive strength was obtained when GGBS and dolomite were proportioned at 70:30. Steel fibres were added to geopolymer concrete (SFGPC) to improve the ductile behaviour and its brittleness index was compared with Ordinary Portland Cement (OPC) concrete. Strength and behaviour of GGBS-Dolomite GPC and SFGPC flexural member subjected to cyclic loading are explained in this paper. Steel fibres are added at 0.25%, 0.5% and 0.75% volume fraction of concrete. Properties such as load deflection behaviour, ultimate load, crack width and ductility were compared with OPC concrete beams.

scholarly journals Influence of Various Types of Steel Fibre on the Mechanical and Physical Characteristics of GGBS Based Geopolymer Concrete

2020 ◽  
pp. 7-19
Author(s):  
M. Ali Sadawy ◽  
Ahmed Serag Faried ◽  
H. A. El-Ghazaly
Keyword(s):  
Steel Fibre ◽  
Volume Fraction ◽  
Setting Time ◽  
Geopolymer Concrete ◽  
Steel Fibres ◽  
Granulated Blast Furnace Slag ◽  
Concrete Mixtures ◽  
Flow Test ◽  
Mechanical And Physical Properties ◽  
Compressive And Flexural Strengths

This study provides experimental investigation of the mechanical and physical properties of reinforced geopolymer concrete based on Ground Granulated Blast Furnace Slag (GGBS). This research demonstrates the influence of various types of steel fibre on compressive, split tensile, flexural strengths and elastic modulus of hardened GPC, workability of reinforced geopolymer concrete and also analyzed the workability, setting time and flow test of fresh geopolymer concrete. Additionally, corrosion test was conducted on reinforced geopolymer concrete. Mixtures of alkaline liquid to GGBS ratio of 0.5 with steel fibers had been added to the mixture of 0% volume fractions (Vf %), 0.5%, 1.0%, and 1.5% concrete amount. Based on the result of the experiments, the presence of steel fibres enhanced the compressive and tensile strength of the SERGPC, in terms of volume fraction of steel fibres as compared to the regular GPC without fibres. It was observed that there was a significant improvement in GPC's mechanical characteristics and corrosion rate as the lifespan of concrete increased. The incorporation of steel fibres resulted in increased compressive and flexural strengths in the early age and consequently tensile splitting power was increased. The increase in concrete geopolymer content improved the rate of corrosion over time.

scholarly journals Behaviour of Micro Reinforced Concrete with Hooked End Steel Fibres subjected to Impact Loads

2019 ◽  
Vol 8 (3) ◽  
pp. 3453-3461
Keyword(s):  
Impact Energy ◽  
Volume Fraction ◽  
Impact Load ◽  
Concrete Strength ◽  
Initial Crack ◽  
Target Strength ◽  
Hardened Concrete ◽  
Steel Fibres ◽  
Drop Weight Test ◽  
The Impact

Reinforced cement concrete is a common material used for building constructions. In this work a trial has been created to utilize steel fibres in RCC members to extend strength and conjointly to extend resistance to impact load. Hooked end steel fibres (HESF) are used here for the preparation of concrete specimens. Concrete grade of M30 is selected and mix design was carried out for target strength of 38.25 N/mm2 . Varied volume fractions of HESF such as 0%, 1%, 2%, 3% and 4% were added to concrete. Cube, beam and cylindrical specimens were cast with good compaction and cured fully as per standards. Hardened concrete strength of all the specimens with different quantities of HEFS were tested. Simple drop weight test was conducted on the specimens reinforced with different percentages of steel fibres. The impact load is produced by means of dropping a weight of 5.5 kg from 400 mm height. Impact energy of the specimens is derived from number of blows required to produce initial crack (N1) and number of blows to cause complete failure (N2). Impact energy of the specimens with different quantities of fibres are compared. Results indicated that the concrete specimens with 3% volume fraction of fibre has shown best performance and it is also seen that the increase in volume of fibre beyond 3% has resulted in reduced impact energy

Punching shear behaviour of geopolymer concrete two-way slabs reinforced by FRP bars under monotonic and cyclic loadings

2022 ◽  
pp. 136943322110523
Author(s):  
Sarwar Hasan Mohmmad ◽  
Mehmet Eren Gülşan ◽  
Abdulkadir Çevik
Keyword(s):  
Cyclic Loading ◽  
Failure Modes ◽  
Load Capacity ◽  
Concrete Strength ◽  
Shear Capacity ◽  
Punching Shear ◽  
Shear Behaviour ◽  
Geopolymer Concrete ◽  
Steel Bars ◽  
Frp Bars

This study examines the punching shear and deflection performance of 16 Geopolymer concrete (GC) two-way slabs subjected to monotonic and cyclic loading by considering the reinforcement material, percentage of reinforcement, type of concrete and the concrete grade. The tested specimens indicated that the crack patterns at the failure and failure modes were almost similar regardless of the type of reinforcement or their ratio. Moreover, the slabs reinforced by fibre-reinforced polymer (FRP) bars exhibited a lower punching capacity than those strengthened by steel bars, even for similar reinforcement ratios. In addition, the results showed that upon increasing the concrete strength and reinforcement ratio, a higher punching shear capacity and lower deflections were obtained under cyclic and monotonic loading. In addition, the punching shear performance of GC slabs was found to be better than that of ordinary concrete (OC), even though both were reinforced by the basalt FRP (BFRP) bar. However, the ultimate load capacity of the slabs was reduced as a result of cyclic loading according to the capacity of the same specimen, resulting from static loading. However, the reduction is very low for slabs reinforced with FRP slabs. Further, the slabs reinforced by FRP had a better fatigue performance compared with slabs reinforced by steel bars with respect to cyclic loading. The results of the tests were also used to evaluate the accuracy of the available punching shear capacity equations.

scholarly journals Strength and Durability Characteristics of Steel Fibre Reinforced Geopolymer Concrete

2018 ◽  
Vol 7 (3.12) ◽  
pp. 337
Author(s):  
J Jessy Magdalene Anna ◽  
A . Sumathi
Keyword(s):  
Experimental Approach ◽  
Steel Fibre ◽  
Base Material ◽  
Geopolymer Concrete ◽  
Conventional Concrete ◽  
Granulated Blast Furnace Slag ◽  
Waste Glass Powder ◽  
Sorptivity Test ◽  
Strength And Durability ◽  
Furnace Slag

Owing to the upturn inrepair and rehabilitation of structures that undergoes deterioration even before its intended life span; it has become necessary to study the durability properties of the structures. This paper deals with an experimental approach on the strength and durability characteristics of Geopolymer Concrete and Steel Fibre Reinforced Geopolymer Concrete with varying proportions of Fly ash, Waste Glass powder and GGBS (Ground Granulated Blast furnace Slag) as base material cured at room temperature. Sodium hydroxide (14M) and Sodium silicate are used as alkali activators. Steel fibres of length 60mm, 0.75mm diameter are used in two different proportions (0.25% and 0.50%). The results are compared with that of the Portland cement based plain and fibre reinforced control concrete. The durability characteristic involved in this study is Sorptivity test. The results reveal that Steel fibre reinforced Geopolymer concrete procures surpassing characteristics than that of Geopolymer concrete which in turn possess superior characteristics than that of conventional concrete.  

Optimum Dosage of Deformed Steel Fibres in Fibrous Concrete Beams under Predominant Shear

2013 ◽  
Vol 651 ◽  
pp. 18-23
Author(s):  
Constantin E. Chalioris
Keyword(s):  
Concrete Beams ◽  
Volume Fraction ◽  
Analysis Tool ◽  
Test Results ◽  
Steel Fibres ◽  
Flexural Response ◽  
Design Charts ◽  
Fibrous Concrete ◽  
Strength And Ductility ◽  
Good Agreement

This study presents an analytical approach to evaluate an optimum content of deformed steel fibres in shear-dominated fibrous concrete beams in order strength and ductility requirements to be satisfied. The proposed methodology is based on the calculations of the flexural and shear capacities and to the concept that a pure flexural response should be achieved. The goal of this method is to evaluate the minimum required value of the fibre factor, F, which expresses the effect of the volume fraction and the geometrical characteristics of the used steel fibres. The calculation of F is achieved using a cubic formula derived from the described procedure. Fibres can be used either as the only shear reinforcement or in combination with stirrups. Test results from 47 beams of the literature are used to verify and to illustrate the application of the proposed approach. Comparisons between experimental and predicted results showed a very good agreement. Design charts have also been plotted by the implementation of this methodology as an analysis tool.

scholarly journals Flexural Behaviour of Combined FA/GGBFS Geopolymer Concrete Beams after Exposure to Elevated Temperatures

2017 ◽  
Vol 2017 ◽  
pp. 1-9 ◽  
Author(s):  
Jun-ru Ren ◽  
Hui-guo Chen ◽  
Tao Sun ◽  
Hao Song ◽  
Miao-shuo Wang
Keyword(s):  
Elevated Temperatures ◽  
Mechanical Performance ◽  
Concrete Beams ◽  
Concrete Strength ◽  
Colour Change ◽  
Geopolymer Concrete ◽  
Structural Element ◽  
Reinforcement Structure ◽  
Promising Alternative ◽  
Fire Endurance

As a promising alternative to OPC concrete, geopolymer concrete has been investigated and has demonstrated superior mechanical performance. Studying the thermal behaviour on the scale of a structural element is significant for introducing a new material to engineering applications. Four geopolymer concrete beams and four OPC concrete counterparts with the same reinforcement structure and similar concrete strength were subjected to three different heating cases at the rate of ISO834. The experimental results showed that the geopolymer concrete beams underwent a colour change, severe cracking, and no spalling after the exposure. While under load, the geopolymer concrete specimens exhibited a lower crack resistance and flexural stiffness. The residual load capacities were 110%, 107%, and 90% of the ambient specimen for the geopolymer concrete samples and 103%, 97%, and 80% for the OPC concrete samples. To some extent, the geopolymer concrete beams achieved superior fire endurance compared to their OPC concrete counterparts.

scholarly journals Shear Strength of Hybrid Fibre-Reinforced Ternary Blend Geopolymer Concrete Beams under Flexure

Materials ◽  
2021 ◽  
Vol 14 (21) ◽  
pp. 6634
Author(s):  
V. Sathish Kumar ◽  
N. Ganesan ◽  
P. V. Indira
Keyword(s):  
Shear Strength ◽  
Concrete Beams ◽  
Reinforced Concrete Beams ◽  
Ternary Blend ◽  
Geopolymer Concrete ◽  
Test Results ◽  
Low Carbon ◽  
Polypropylene Fibres ◽  
Steel Fibres ◽  
Hybrid Fibre

The need to promote sustainable civil infrastructure is one of the most important concerns in the construction industry. Geopolymer composites are one of the promising eco-friendly materials for the development of low carbon concrete. The main objective of this experimental investigation is to study the effect of hybrid fibres on the shear strength of flexural members made with ternary blend geopolymer concrete (TGPC). A total number of 27 reinforced concrete beams of size 100 × 150 × 1200 mm3 were cast and tested for shear. M55 grade of concrete was considered in this study. Crimped steel fibres and polypropylene fibres with an aspect ratio of 66 and 300, respectively, were used in this work. The main variables considered in this investigation involve two volume proportions of steel fibres, viz., 0.5% and 1% as well as four volume proportions of polypropylene fibres viz., 0.1%, 0.15%, 0.2% and 0.25%. The hybrid fibre-reinforced ternary blend geopolymer concrete (HTGPC) beams were compared with TGPC beams without fibres. From the test results, it was clear that incorporating hybrid fibres improved the shear strength and changed the type of failure of the beam from shear to flexure. Moreover, a method to predict the ultimate shear strength of HTGPC was proposed, and the estimated values were found to be the same as the test results.

Effect of ground granulated blast funrnace slag and fly ash on strength, permeability, and under-water abrasion of fine-grained concrete

2020 ◽  
Vol 71 (7) ◽  
pp. 775-788
Author(s):  
Quyet Truong Van ◽  
Sang Nguyen Thanh
Keyword(s):  
Fly Ash ◽  
Concrete Strength ◽  
Cementitious Materials ◽  
Supplementary Cementitious Materials ◽  
Chloride Permeability ◽  
Cement Replacement ◽  
Fine Grained ◽  
Granulated Blast Furnace Slag ◽  
Compressive Strength Test ◽  
Economic Ground

The utilisation of supplementary cementitious materials (SCMs) is widespread in the concrete industry because of the performance benefits and economic. Ground granulated blast furnace slag (GGBFS) and fly ash (FA) have been used as the SCMs in concrete for reducing the weight of cement and improving durability properties. In this study, GGBFS at different cement replacement ratios of 0%, 20%, 40% and 60% by weight were used in fine-grained concrete. The ternary binders containing GGBFS and FA at cement replacement ratio of 60% by weight have also evaluated. Flexural and compressive strength test, rapid chloride permeability test and under-water abrasion test were performed. Experimental results show that the increase in concrete strength with GGBFS contents from 20% to 40% but at a higher period of maturity (56 days and more). The chloride permeability the under-water abrasion reduced with the increasing cement replacement by GGBFS or a combination of GGBFS and FA

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