scholarly journals Durability Performance Evaluation of Rubberized Geopolymer Concrete

2021 ◽  
Vol 13 (11) ◽  
pp. 5969
Author(s):  
Salmabanu Luhar ◽  
Ismail Luhar ◽  
Demetris Nicolaides ◽  
Rajesh Gupta
Keyword(s):  
Performance Evaluation ◽  
Fly Ash ◽  
Acid Resistance ◽  
Drying Shrinkage ◽  
Salt Resistance ◽  
Raw Material ◽  
Chloride Diffusion ◽  
Geopolymer Concrete ◽  
Promising Alternative ◽  
Operational Energy

Unfortunately, the production of cement impacts pessimistically on environments since it emits CO2—a principal Green House Gas (GHG)—encouraging the earth-heating dilemma. Moreover, it necessitates not only high temperature produced by the devouring of narrow natural mineral coal resources to obtain very high amounts of energy, but it also gulps down natural limestone deposits as a raw material that is found confined in nature to obtain intense energy. Quite recently, geopolymerisation—an exothermic process, through which geopolymeric binders can be produced by synthesis of a pozzolanic precursor rich in Alumina and Silica, for an instant, Fly Ash, with alkali solution for activation in an alkali medium at a low temperature and low operational energy—is recognized as a brilliantly promising alternative to conventional cement. That means, no elevated temperature and higher energy consuming reactions are essential any more as found associated with contemporary cement production. This research paper moves towards fulfilling the performance evaluation of durability studies viz., water permeability, sorptivity, sulphate resistance, acid resistance, salt resistance, chloride diffusion, drying shrinkage, and corrosion of fly ash based user and eco-friendly rubberized (containing rubber tyre fibres) geopolymer concrete. Comparisons of the outcomes have been made with its counterpart, which has unearthed that Rubberized Geopolymer Concrete proved to better concerning all the above-mentioned parameters than Rubberized OPC-Concrete.

Recycling of Fly Ash as an Energy Efficient Building Material: A Sustainable Approach

2016 ◽  
Vol 692 ◽  
pp. 54-65
Author(s):  
Mohammad Arif Kamal
Keyword(s):  
Fly Ash ◽  
Building Material ◽  
Power Plants ◽  
Building Materials ◽  
Construction Material ◽  
Thermal Power ◽  
Raw Material ◽  
Geopolymer Concrete ◽  
Promising Alternative ◽  
Resource Material

Fly Ash, known for its proven stability for variety of applications as admixture in cement, concrete, mortar, lime pozzolan mixture (bricks. blocks) etc, is an industrial by-product from Thermal Power Plants with current annual generation of approximately 108 million tones. Fly Ash is not just environment friendly, but is known for its cost effectiveness as well. Its use as a building material helps increase buildings strength and stability. Fly Ash is believed to be a very promising alternative for the industry seeking to meet its development objectives. Fly Ash is being very effectively and economically used in building components such as bricks, doors, door-frames, etc. Fly Ash is also being used in construction of roads and embankments with some design changes. It is also used as raw material in agricultural and wasteland development programmes. The trend is clear, Fly Ash will soon be considered as a resource material and its potential will be fully exploited. Through development & application of technologies, Fly Ash has shifted from “Waste Material” category to “Resource Material” category. The purpose of this paper is to provide an overview of disposal and utilization of Fly Ash and its beneficial potential in application of civil engineering construction as well as others. The focus of this paper is to explore the properties of fly ash as building materials and also aims at the properties of geopolymer concrete, how these distinguish from general characteristics of ordinary Portland cement. It also lay emphasize on durability, properties of fly ash based geopolymer concrete and its advantage when used as a construction material as well.

Alternative Concrete – Geopolymer Concrete

2021 ◽  
Keyword(s):  
Mechanical Properties ◽  
Fly Ash ◽  
Construction Industry ◽  
Building Material ◽  
Construction Materials ◽  
Raw Material ◽  
Geopolymer Concrete ◽  
Sustainable Solutions ◽  
New Construction ◽  
Alkali Activated

Concrete is the most versatile, durable and reliable material and is the most used building material. It requires large amounts of Portland cement which has environmental problems associated with its production. Hence, an alternative concrete – geopolymer concrete is needed. The general aim of this book is to make significant contributions in understanding and deciphering the mechanisms of the realization of the alkali-activated fly ash-based geopolymer concrete and, at the same time, to present the main characteristics of the materials, components, as well as the influence that they have on the performance of the mechanical properties of the concrete. The book deals with in-depth research of the potential recovery of fly ash and using it as a raw material for the development of new construction materials, offering sustainable solutions to the construction industry.

Study on Production of Autoclaved Aerated Concrete by Coal Gangue Fly Ash

2013 ◽  
Vol 357-360 ◽  
pp. 949-954
Author(s):  
Ye Zhang ◽  
Peng Xuan Duan ◽  
Bao Sheng Jia ◽  
Lei Li
Keyword(s):  
Compressive Strength ◽  
Fly Ash ◽  
Drying Shrinkage ◽  
Coal Gangue ◽  
National Standards ◽  
Raw Material ◽  
Autoclaved Aerated Concrete ◽  
Binder Ratio ◽  
Material Formulation ◽  
Aerated Concrete

In this paper, the low-silicon coal gangue fly ash is used to produce autoclaved aerated concrete. The influences of water binder ratio, coal gangue fly ash content, calcareous content and conditioning agents on the compressive strength of the autoclaved aerated concrete are investigated. Optimal raw material formulation and procedure are determined for the autoclaved aerated concrete. The compressive strength and frost resistance of autoclaved aerated concrete made by the optimal raw material formulation and procedure meet with the requirements of autoclaved aerated concretes of B05 grade, and its thermal conductivity, drying shrinkage reach the requirements of the relevant national standards of China.

EVALUATION OF SHRINKAGE AND DURABILITY OF GEOPOLYMER CONCRETE USING F-CLASS COAL ASHES

2014 ◽  
Vol 1 (1) ◽  
Author(s):  
Gum Sung Ryu ◽  
Kyung Taek Koh ◽  
Gi Hong An ◽  
Jang Hwa Lee
Keyword(s):  
Compressive Strength ◽  
Fly Ash ◽  
Bottom Ash ◽  
Drying Shrinkage ◽  
Geopolymer Concrete ◽  
Cement Concrete ◽  
Fly Ash Concrete ◽  
Coal Ashes

This paper evaluates the strength, shrinkage and durability characteristics of concrete using 100% fly ash and bottom ash as binder. It is seen that the compressive strength of activated fly ash and bottom ash concrete reaches respectively 25 MPa and 30 MPa, and that the change in strength is insignificant as per the content of bottom ash powder. Moreover, the total amount of shrinkage of the activated bottom ash concrete appears to be larger than that of the activated fly ash concrete. In addition, the drying shrinkage and durable performance of the activated ash geopolymer concrete is verified to be superior to that of ordinary cement concrete.

SERVICEABILITY OF LOW CREEP FLY ASH GEOPOLYMER CONCRETE BEAMS

2017 ◽  
Vol 4 (1) ◽  
Author(s):  
Arnaud Castel ◽  
Stephen Foster ◽  
Raymond Ian Gilbert
Keyword(s):  
Fly Ash ◽  
Concrete Beams ◽  
Drying Shrinkage ◽  
Performance Criterion ◽  
Geopolymer Concrete ◽  
Curing Conditions ◽  
Model Code ◽  
Sustained Loading ◽  
Low Calcium ◽  
Eurocode 2

In reinforced concrete construction, deflection control is an important performance criterion for their serviceability. The aim of the research described in this paper is to assess the deformation of cracked reinforced geopolymer concrete beams under long term service loading. The geopolymer binder is Portland cement free, using 85% of low calcium fly ash, 15% of GGBFS (Ground Granulated Blast Furnace Slag) and a sodium silicate/sodium hydroxide based activator. Firstly, geopolymer concrete drying shrinkage and creep were measured. Different curing conditions at elevated temperature were used. All experimental results are compared to predictions made using the Eurocode 2. Secondly, geopolymer concrete beams were subjected to short time bending tests leading to concrete cracking (pre-cracking tests). Beams were then stored under sustained loading for a period of four months. Both deflection and cracks were monitored versus time. Results show that, providing an appropriate heat curing regime, geopolymer concrete creep is much lower than that observed for OPC concrete and predicted by the Eurocode 2. As a result, the time-dependent deflection of geopolymer concrete beams measured after 4 months under sustained loading was always significantly lower than that of traditional OPC concrete beams. All results are showing that the crack widths of geopolymer concrete beams are significantly smaller than those expected for OPC concrete beams according to fib model code 2010 for both short and long terms tests. It is concluded that low calcium fly ash-based geopolymer concrete is a promising option for precast applications.

Drying Shrinkage of Fly Ash-Based Self-Compacting Geopolymer Concrete

2014 ◽  
Vol 567 ◽  
pp. 362-368 ◽  
Author(s):  
M.F. Nuruddin ◽  
F.A. Memon ◽  
N. Shafiq ◽  
S. Demie
Keyword(s):  
Fly Ash ◽  
Relative Humidity ◽  
Drying Shrinkage ◽  
Time Dependent ◽  
Geopolymer Concrete ◽  
Test Results ◽  
Shrinkage Behaviour ◽  
One Year ◽  
Curing Regime

–The drying shrinkage behaviour of fly-ash-based self-compacting geopolymer concrete (SCGC) was studied for a period of one year. Two SCGC and One OPC-based conventional mixture were used in the present investigation. Drying shrinkage test commenced on the 7th day after casting the test specimens. Once the appropriate curing regime was completed, the specimens from each mix were placed in the laboratory room where the temperature was maintained at 23°C, however, the relative humidity of the room varied between 56 and 64 percent. Strain readings taken at specific intervals were analyzed to determine the time-dependent deformations of each mixture. Test results indicated that the heat-cured fly ash-based SCGC experienced very low drying shrinkage than that of water-cured OPC based concrete. After one year of exposure, in comparison to 466 με, the value experienced by OPC concrete, the drying shrinkage strains of SCGC mix specimens ranged between 141 and 159 με. These values were about 65-70% lower than that of OPC concrete. It is anticipated that the findings of this investigation would help in predicting the behaviour of SCGC. Keywords-Fly ash, Geopolymer concrete, Self-compacting Geopolymer concrete, Drying shrinkage

scholarly journals A Brief Review of Fly-ash Based Geopolymer Concrete

2021 ◽  
pp. 230-237
Author(s):  
Vaibhavi G Galande ◽  
Harshavardhan U Kamble
Keyword(s):  
Fly Ash ◽  
Thermal Power ◽  
Acid Resistance ◽  
Potassium Thiocyanate ◽  
Sodium Thiocyanate ◽  
Geopolymer Concrete ◽  
Conventional Concrete ◽  
Concrete Material ◽  
Concrete Mix Design ◽  
Test Result

Geopolymer concrete can be the future of the conventional concrete and it can be used as replacement agent instead of conventional concrete in construction work along with that the GPC is eco friendly in nature as it does not emits CO2 in atmosphere so it is helpful to reduce the Greenhouse effect. The material used for the manufacturing of GPC are Binder’s and Actuators. Birder’s are obtained from the thermal power plant also known as fly ash and actuator consist of the sodium silicate and sodium hydroxide, calcium chloride, sodium thiocyanate, potassium thiocyanate, etc. By combing these acceleration and Binder’s with other concrete material the process of Geopolymeration starts. The objective of these study is to give a detailed review on the geopolymer concrete mix design, compressive behavior, flexural and split tensile behavior and chemical acid resistance when immersed in sopheric acid and nitric acid by using various research paper and the test result difference of conventional concrete and geopolymer concrete. Based on that a review is prepared.

scholarly journals Acid Resistance and Curing Properties for Green Fly Ash-geopolymer Concrete

2013 ◽  
Vol 12 (2) ◽  
pp. 317-322 ◽  
Author(s):  
Khoa Tan Nguyen ◽  
Young Hak Lee ◽  
Jaehong Lee ◽  
Namshik Ahn
Keyword(s):  
Fly Ash ◽  
Acid Resistance ◽  
Geopolymer Concrete
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