scholarly journals Mechanical properties of the wet mixed geopolymer concrete based on CDG and Slag cementitious materials in ambient curing temperature

2020 ◽  
Vol 720 ◽  
pp. 012004
Author(s):  
Xiaoxiong Zha ◽  
Kai Wang ◽  
Jiayuan Zhu
Keyword(s):  
Mechanical Properties ◽  
Cementitious Materials ◽  
Curing Temperature ◽  
Geopolymer Concrete ◽  
Ambient Curing

scholarly journals Study on Preparation of Coal Gangue-Based Geopolymer Concrete and Mechanical Properties

2021 ◽  
Vol 2021 ◽  
pp. 1-13
Author(s):  
Daming Zhang ◽  
Fangjin Sun ◽  
Tiantian Liu
Keyword(s):  
Mechanical Properties ◽  
Raw Materials ◽  
Mechanical Tests ◽  
Coal Gangue ◽  
Curing Temperature ◽  
Geopolymer Concrete ◽  
Dry Powder ◽  
Binder Ratio ◽  
Temperature Water ◽  
Water Binder Ratio

Alkaline dry powder activator, coal gangue, fly ash, and other raw materials are utilized to prepare coal gangue-based geopolymer concrete. The procedures of making the coal gangue-based geopolymer concrete are illustrated firstly. Also, basic mechanical properties, such as compressive strength and flexural strength of the geopolymer concrete, are studied through mechanical tests. The basic mechanical properties of ordinary concrete and coal gangue-based geopolymer concrete with different activation methods were compared and analyzed. Effects of curing temperature, curing time, water-binder ratio, and sand ratio on the basic mechanical properties of coal gangue-based geopolymer concrete activated by alkaline dry powder were studied. The optimal curing temperature, water-binder ratio, and sand ratio range of coal gangue-based geopolymer concrete activated by alkaline dry powder are obtained, respectively.

Research on Mechanical Properties of Geopolymer Concrete under early Stage Curing System

2012 ◽  
Vol 164 ◽  
pp. 492-496
Author(s):  
Qing Wang ◽  
Kun Ran ◽  
Zhao Yang Ding ◽  
Lin Ge Qiu
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Room Temperature ◽  
Storage Time ◽  
Early Stage ◽  
Curing Temperature ◽  
Geopolymer Concrete ◽  
Curing Time ◽  
Curing Age

Mechanical properties of geopolymer concrete under early stage curing system were studied. The results showed that at the early stage of curing time, compressive strength was improved significantly with the increasing of curing temperature and curing time. The compressive strength decreased and was close to that of standard curing condition at the age of 28d as the curing age increased. In addition, prolonging the storage time at room temperature before the step of high temperature curing could increase the long-term strength.

scholarly journals Durability Performance On Alkali Activated Metakaolin And Bottom Ash Based Geopolymer Concrete

2021 ◽  
Author(s):  
Logesh Kumar M ◽  
Revathi V
Keyword(s):  
Sodium Hydroxide ◽  
Bottom Ash ◽  
Acid Resistance ◽  
Curing Temperature ◽  
Geopolymer Concrete ◽  
Test Results ◽  
Conventional Concrete ◽  
Durability Performance ◽  
Alkali Activated ◽  
Ambient Curing

Abstract This paper presents an experimental investigation on the durability properties of metakaolin (MK) and bottom ash (BA) blended geopolymer under different environmental exposure. The blended geopolymer concrete (GPC) was prepared with sodium based alkaline activators under ambient curing temperature. The concentration of sodium hydroxide used was 8M. The ratio of sodium silicate to sodium hydroxide was kept as 2.0. The performance of blended geopolymer concrete was compared with conventional concrete (CC). The test results reveal that blended geopolymer concrete develops a better performance against sulphate and acid resistance. Also, MK- BA GPC shows enhanced performance over the conventional concrete in terms of sorptivity, rapid chloride and water absorption.

scholarly journals Influence of Using Various Percentages of Slag on Mechanical Properties of Fly Ash-based Geopolymer Concrete

2021 ◽  
Vol 27 (10) ◽  
pp. 50-67
Author(s):  
Sarah Sameer Hussein ◽  
Nada Mahdi Fawzi
Keyword(s):  
Mechanical Properties ◽  
Blast Furnace ◽  
Fly Ash ◽  
Blast Furnace Slag ◽  
Cementitious Materials ◽  
Geopolymer Concrete ◽  
Conventional Concrete ◽  
Heat Curing ◽  
Mix Proportion ◽  
Furnace Slag

In order to implement the concept of sustainability in the field of construction, it is necessary to find an alternative to the materials that cause pollution by manufacturing, the most important of which is cement. Because factory wastes provide siliceous and aluminous materials and contain calcium such as fly ash and slag that are used in the production of high-strength geopolymer concrete with specifications similar to ordinary concrete, it was necessary for developing this type of concrete that is helping to reduce CO2 (dioxide carbon) in the atmosphere. Therefore, the aim of this study was to study the influence of incorporating various percentages of slag as a replacement for fly ash and the effect of slag on mechanical properties. This paper showed the details of the experimental work that has been undertaken to search and make tests the strength of geopolymer mixtures made of fly ash and then replaced fly ash with slag in different percentages. The geopolymer mixes were prepared using a ground granulated blast-furnace slag (GGBFS) blend and low calcium fly ash class F activated by an alkaline solution. The mixture compositions of fly ash to slag were (0.75:0.25, 0.65:0.35, 0.55:0.45) by weight of cementitious materials respectively and compared with reference mix of conventional concrete with mix proportion 1:1.5:3 (cement: sand: coarse agg.), respectively. The copper fiber was used as recycled material from electricity devices wastes such as (machines, motors, wires, and electronic devices) to enhance the mechanical properties of geopolymer concrete. The heat curing system at 40 oC temperature was used. The results revealed that the mix proportion of 0.45 blast furnace slag and 0.55 fly ash produced the best strength results. It also showed that this mix ratio could provide a solution for the need for heat curing for fly ash-based geopolymer.

scholarly journals Development of High Strength Geopolymer Concrete using Nano Silica

2020 ◽  
Vol 10 (2) ◽  
pp. 73-80
Keyword(s):  
Mechanical Properties ◽  
High Strength ◽  
Cementitious Materials ◽  
Geopolymer Concrete ◽  
Nano Silica ◽  
Cement Production ◽  
Granulated Blast Furnace Slag ◽  
Alkaline Activator ◽  
Materials Used ◽  
Emission Of Greenhouse Gases

Cement production became responsible of polluting the atmosphere by the emission of greenhouse gases. This issue motivate the researchers to work hard to develop a new cementitious materials used in concrete having much lower foot print in environmental pollution. This paper presents the development of high strength geoploymer concrete using nano silica. Ground granulated blast furnace slag (GGBFS) is used as main cementitious material and silica fume (SF) is used as cement replacement by different ratios. The alkaline activator is used in different temperature and samples cured by different methods. Nano silica then added to the optimum geopolymer concrete sample by ratios 1, 2 and 3% of the total weight of cementitious materials. Samples tested for mechanical properties. The results showed that using hot activator and oven curing samples gives higher mechanical properties. Also using nano silica up to 2% increases the compressive strength up to 24% at age 28 days.

scholarly journals Proposing Several Model Techniques Including ANN and M5P-tree to Forecast the Stress at the Failure of Geopolymer Concrete Mixtures Incorporated Nano-silica

2022 ◽  
Author(s):  
Hemn Unis Ahmed ◽  
Ahmed S. Mohammed ◽  
Azad A. Mohammed
Keyword(s):  
Portland Cement ◽  
Alkaline Solution ◽  
Cementitious Materials ◽  
The Other ◽  
Curing Temperature ◽  
Model Parameters ◽  
Geopolymer Concrete ◽  
Ann Model ◽  
Nano Silica ◽  
Binder Ratio

Abstract Geopolymers are innovative cementitious materials that can completely replace traditional Portland cement composites and have a lower carbon footprint than Portland cement. Recent efforts have been made to incorporate various nanomaterials, most notably nano-silica (nS), into geopolymer concrete (GPC) to improve the composite's properties and performance. Compression strength (CS) is one of the essential properties of all types of concrete composites, including geopolymer concrete. As a result, creating a credible model for forecasting concrete CS is critical for saving time, energy, and money, as well as providing guidance for scheduling the construction process and removing formworks. This paper presents a large amount of mixed design data correlated to mechanical strength using empirical correlations and neural networks. Several models, including artificial neural network, M5P-tree, linear regression, nonlinear regression, and multilogistic regression models were utilized to create models for forecasting the CS of GPC incorporated nS. In this case, about 207 tested CS values were collected from literature studies and then analyzed to promote the models. For the first time, eleven effective variables were employed as input model parameters during the modeling process, including the alkaline solution to binder ratio, binder content, fine and coarse aggregate content, NaOH and Na2SiO3 content, Na2SiO3/NaOH ratio, molarity, nS content, curing temperatures, and ages. The developed models were assessed using different statistical tools such as RMSE, MAE, SI, OBJ value, and R2. Results revealed that the ANN model estimated the CS of GPC incorporated nS more accurately than the other models. On the other hand, the alkaline solution to binder ratio, molarity, NaOH content, curing temperature, and ages were those parameters that have significant influences on the CS of GPC incorporated nS.

scholarly journals Effect of Hybrid Binder on Properties of Geopolymer Concrete – State of Art

2019 ◽  
Vol 9 (1S3) ◽  
pp. 466-474
Keyword(s):  
Structural Properties ◽  
Cementitious Materials ◽  
Curing Temperature ◽  
Geopolymer Concrete ◽  
Natural Pozzolans ◽  
Durability Properties ◽  
Minimal Effort ◽  
State Of Art

Natural pozzolans are colossal wellspring of receptive silica and alumina required for geopolymer amalgamation as an alternative binder for conventional Portland concrete. They are accessible at a relatively minimal effort and produce a low environmental impression through their basic extraction. Following audit paper condenses the mechanical and durability attributes just as the micro structural properties of common pozzolan based geopolymers and their potential as binder. The stretch out of geopolymerization increments with the expansion of curing temperature invigorating higher compressive at early ages with no huge effect on later age strength, in any case, expansion of different cementitious materials and hybrid binder improves the mechanical and durability properties of these geopolymers. This paper displays a succinct audit of different examinations that have demonstrated the use of different modern waste items in the amalgamation of geopolymers.

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