The effects of ground granulated blast-furnace slag blending with fly ash and activator content on the workability and strength properties of geopolymer concrete cured at ambient temperature

This paper comprises of the experimental study of double skinned (DSCFT) Composite hollow columns using Geopolymer concrete. The diameter-thickness (D/t) ratio and the hollowness ratio were consideredas main parameters in designing the specimens. The Geopolymer Concrete used in this project is the most promising technique. It is composed of fly-ash, fine aggregate, coarse aggregate and alkaline solution. By using large volume of ordinary Portland cement (OPC) concrete, the production of cement increases 3% annually. The production of one ton of cement directly liberates about 1 ton of CO2 and indirectly liberates 0.4 ton of CO2 to atmosphere. Among the greenhouse gases, CO2 contributes about 67% of global warming. In this respect fly ash based geopolymer mortar is highly considerable. But most of the previous works on fly ash-based geopolymers concrete reveals that hardening is due to heat curing, which is considered as a limitation for cast in situ applications at low ambient temperatures. In order to overcome this situation, replacing the Ground blast furnace slag with fly ash for various proportions to achieve geopolymer concrete suitable for curing without elevated heat. The Scope of this project is to find optimization level of Ground Granulated blast furnace slag in geopolymer concrete for curing in ambient condition and to analyze the compressive Strength of optimized GGBS based Geopolymer Concrete filled double skinned steel tube by varying the size of the steel tubes.

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Characteristics of Blended Geopolymer Concrete Using Ultrafine Ground Granulated Blast Furnace Slag and Copper Slag

Annales de Chimie Science des Matériaux ◽

10.18280/acsm.440610 ◽

2020 ◽

Vol 44 (6) ◽

pp. 433-439

Author(s):

Vijayasarathy Rathanasalam ◽

Jayabalan Perumalsami ◽

Karthikeyan Jayakumar

Keyword(s):

Blast Furnace ◽

Fly Ash ◽

Sodium Hydroxide ◽

Blast Furnace Slag ◽

Copper Slag ◽

Fine Aggregate ◽

Geopolymer Concrete ◽

Strength Performance ◽

Granulated Blast Furnace Slag ◽

Furnace Slag

This paper presents the properties of blended geopolymer concrete manufactured using fly ash and ultrafine Ground Granulated Blast Furnace Slag (UFGGBFS), along with the copper slag (CPS) as replacement of fine aggregate (crushed stone sand). Various parameters considered in this study include different sodium hydroxide concentrations (10M, 12M and 14M); 0.35 as alkaline liquid to binder ratio; 2.5 as sodium silicate to sodium hydroxide ratio and cured in ambient curing condition. Further, geopolymer concrete was manufactured using fly ash as the prime source material which is replaced with UFGGBFS (0%, 5%, 10% and 15%). Copper slag has been used as replacement of fine aggregate in this study. Properties of the fresh manufactured geopolymer concrete were studied by slump test. Compressive strength of the manufactured geopolymer concrete was tested and recorded after curing for 3, 7 and 28 days. Microstructure Characterization of Geopolymer concrete specimens was done by Scanning Electron Microscope (SEM) analysis. Experimental results revealed that the addition of UFGGBFS resulted in an increased strength performance of geopolymer concrete. Also, this study demonstrated that the strength of geopolymer concrete increased with an increase in sodium hydroxide concentration. SEM results revealed that the addition of UFGGBFS resulted in a dense structure.

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Domınance of materıal composıtıon on mechanıcal propertıes of normal and hıgh strength grade bınary blended geopolymer concrete

Technium: Romanian Journal of Applied Sciences and Technology ◽

10.47577/technium.v2i3.392 ◽

2020 ◽

Vol 2 (3) ◽

pp. 128-133

Author(s):

Addepalli Mallinadh Kashyap ◽

Tanimki Chandra Sekhar Rao ◽

N.V.Ramana Rao

Keyword(s):

Mechanical Properties ◽

Blast Furnace ◽

Fly Ash ◽

Blast Furnace Slag ◽

High Strength ◽

Geopolymer Concrete ◽

Green House Gases ◽

Green House ◽

Granulated Blast Furnace Slag ◽

Furnace Slag

The utilisation of pozzolanic materials as the replacement to conventional cement material have the potentiality to mitigate the pollution caused by the émission of carbon based green house gases which are a main source for global warming problem. For every production of 1 ton of cement it was approximated that the emission of carbon based green house gases are about 1 ton. Keeping this in view, a new material called Geopolymer which was first coined by Davidovits has gained a lot of interest by the researchers. In this study, different molarity variations of NaOH in the order of 4M, 6M, 8M, 10M, 12M and 14M and also the blending of mineral admixtures like Fly Ash and Ground Granulated Blast Furnace Slag with percentages (50%+50%) and the mechanical properties of normal M30 and high strength grade M70 binary blended Geopolymer concrete were studied after 28 days of ambient curing and were reported. The test results revealed that the effect of molar concentration of NaOH at 12 M is effective and the optimum replacement of mineral composition of source materials is (50%+50%) fly ash and ground granulated blast furnace slag.

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Strength Properties of Geopolymer Concrete with Ground Granulated Blast Furnace Slag and Metakaolin

International Journal of Recent Technology and Engineering - 2 ◽

10.35940/ijrte.d1016.1284s219 ◽

2019 ◽

Vol 8 (4S2) ◽

pp. 64-67

Keyword(s):

Blast Furnace ◽

Compression Test ◽

Blast Furnace Slag ◽

Strength Properties ◽

Geopolymer Concrete ◽

Test Results ◽

Granulated Blast Furnace Slag ◽

Concrete Cylinders ◽

Furnace Slag ◽

Flexure Test

In this study, geopolymer concrete is prepared by using 100% Ground Granulated Blast furnace Slag (GGBS). Then the GGBS is replaced by Metakaolin from 0 to 25% with the variation of 5% for preparing the specimens. The activator solution consists of Sodium hydroxide of 12 Molarity and sodium silicate in the ratio of 1: 2.5. 550kg/m3 of GGBS is used in this study. A carboxylic based admixture called La Hypercrete S25 is added in the mix by 1% of the weight of GGBS to increase the workability. The studies conducted on the specimens are compression test, split tensile test and flexure test. For conducting the compression test, 54 concrete cubes of size 100mm x 100mm x 100mm are cast for testing at 7, 14 and 28 days. For splitting tensile strength, 54 concrete cylinders with 100 mm dia and 200 mm height are cast for testing at 7, 14 and 28 days. The flexure test specimens are beams of 500 mm length and 100mm x 100mm in cross section are cast. These are 54 in numbers .Specimens are cast by replacing the GGBS by Metakaolin in 5, 10, 15, 20 and 25%. All the specimens are cured for 7, 14 and 28 days and tested for compression, split tensile and flexure. The test results reveal that the strengths are gradually increasing for 5, 10 and 15% replacement of GGBS by Metakaolin and give the highest value for 20% in all the tests. It also shows further increased replacements reduces the test values. It proves that geopolymer concrete performs well in strength properties with GGBS and Metakaolin.

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Mechanical Properties of Self-Compacting Geopolymer Concrete Using Fly Ash and GGBS

Asian Journal of Engineering and Applied Technology ◽

10.51983/ajeat-2018.7.1.889 ◽

2018 ◽

Vol 7 (1) ◽

pp. 19-23

Author(s):

S. Thirupathiraj .

Keyword(s):

Blast Furnace ◽

Fly Ash ◽

Blast Furnace Slag ◽

Geopolymer Concrete ◽

Cement Concrete ◽

Self Compacting Concrete ◽

Split Tensile Strength ◽

Granulated Blast Furnace Slag ◽

Concrete Mix ◽

Furnace Slag

Cement is the core content for the concrete mix. Manufacturing of cement causes CO2 emission which leads to the pollution, health and environmental problems like global warming to control over the adverse effect we can prefer geopolymer concrete which is not a cement concrete. Factory wastes such as fly ash, ground granulated blast furnace slag (GGBS), silica fume and Metakaolin can be used as alternate for cement. This study mainly focus on the ratio of fly ash and ground granulated blast furnace slag (GGBS) for optimum levels which nearly matches the cement concrete properties. This study involves the various tests like slump flow, compression testing, split tensile strength and flexural strength of self-compacting geopolymer concrete. Self-compacting concrete is a highly flowable concrete that spreads into the form without the need of mechanical vibration. Self-compacting concrete is a non-segregating concrete that is placed by means of its own weight. The advantages include improved constructability, Labour reduction, bond to steel, Flow into complex forms, reduced equipment wear etc. The aim of this study is to achieve an optimum self-compacting concrete geopolymer concrete mix proportion using fly ash and ground granulated blast furnace slag (GGBS). Then the study will be further extended by investigating the durability properties of self-compacting geopolymer concrete.

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Strength and Permeation Properties of Slag Blended Fly Ash Based Geopolymer Concrete

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.651.168 ◽

2013 ◽

Vol 651 ◽

pp. 168-173 ◽

Cited By ~ 16

Author(s):

Sarathi Deb Partha ◽

Nath Pradip ◽

Kumar Sarker Prabir

Keyword(s):

Compressive Strength ◽

Blast Furnace ◽

Fly Ash ◽

Ambient Temperature ◽

Blast Furnace Slag ◽

Carbon Dioxide Emission ◽

Geopolymer Concrete ◽

Concrete Production ◽

Furnace Slag ◽

Permeation Properties

Geopolymer is a binder that can act as an alternative of Portland cement. Geopolymers use by-product substances such as fly ash, and can help reduce carbon dioxide emission of concrete production. This paper presents the results of a study on the fly ash based geopolymer concrete suitable for curing at ambient temperature. To activate the fly ash, a combination of sodium hydroxide and sodium silicate solutions was used. The setting and hardening of geopolymer concrete were obtained by blending blast furnace slag with fly ash instead of using heat curing. Ground granulated blast furnace slag (GGBFS) was used at the rate of 10% or 20 % of the total binder. The tests conducted include compressive strength, tensile strength, flexure strength, sorptivity and volume of permeable voids (VPV) test. The geopolymer concrete compressive strength at 28 days varied from 27 to 47 MPa. Results indicated that the strength increased and water absorption decreased with the increase of the slag content in the geopolymer concrete. In general, blending of slag with fly ash in geopolymer concrete improved strength and permeation properties when cured in ambient temperature.

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