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Optimization and characterization of geopolymer mortars using response surface methodology
The current study uses a statistical approach known as Response Surface Methodology (RSM) to optimize the constituents for the production of a cementitous binder referred as engineered geopolymer concrete (E-GPC). RSM method was used to optimize the influence on strength and porosity using three variables such as silica and alumina content of the fly ash and activator solution to binder ratio. Fifteen experimental runs were designed using Central Composite design as suggested by RSM and was compared with the experimental data. The performance of the models suggested a possible relation between the three variables to achieve a desired engineering E-GPC in terms of strength and porosity. In addition, microstructural characterization was carried out using scanning electron microscope (SEM), X-Ray Diffraction (XRD) and Fourier Transform Infrared Spectroscopy (FTIR). The characterization revealed information related to crystalline to amorphous content of E-GPC, zeolitic crystalline phases and bonds between Si and Al to examine the effect of hydrated sodium alumino silicate hydrate (N-A-S-H) on strength of geopolymeric gels. Optimization of geopolymer concrete, using RSM and microstructural study helped in designing an engineering E-GPC in terms of strength, porosity, workability and setting time for specific civil infrastructure applications.
Optimization and characterization of geopolymer mortars using response surface methodology
The current study uses a statistical approach known as Response Surface Methodology (RSM) to optimize the constituents for the production of a cementitous binder referred as engineered geopolymer concrete (E-GPC). RSM method was used to optimize the influence on strength and porosity using three variables such as silica and alumina content of the fly ash and activator solution to binder ratio. Fifteen experimental runs were designed using Central Composite design as suggested by RSM and was compared with the experimental data. The performance of the models suggested a possible relation between the three variables to achieve a desired engineering E-GPC in terms of strength and porosity. In addition, microstructural characterization was carried out using scanning electron microscope (SEM), X-Ray Diffraction (XRD) and Fourier Transform Infrared Spectroscopy (FTIR). The characterization revealed information related to crystalline to amorphous content of E-GPC, zeolitic crystalline phases and bonds between Si and Al to examine the effect of hydrated sodium alumino silicate hydrate (N-A-S-H) on strength of geopolymeric gels. Optimization of geopolymer concrete, using RSM and microstructural study helped in designing an engineering E-GPC in terms of strength, porosity, workability and setting time for specific civil infrastructure applications.
Optimization and characterization of geopolymer mortars using response surface methodology
Dhakal, Milap (author) / Kupwade-Patil, Kunal (author) / Allouche, Erez N. (author) / Ham, Kyungmin (author)
2014
15 Seiten, 14 Bilder, 5 Tabellen, 16 Quellen
Conference paper
English
FTIR-Spektroskopie , Geopolymer , Response-Surface-Methode , Röntgendiffraktion , Infrastrukturanwendung , Siliciumdioxid , Aluminiumoxid , Flugasche , Natriumsilicat , Hydrat , Gel , experimentelle Daten , Elektronenmikroskop , Komposit , statistisches Verfahren , Näherungsverfahren , Mikrostruktur , mathematisches Verfahren , Zementmörtel , Aktivierungsmittel , alkalische Aktivierung , Modellberechnung , Rasterelektronenmikroskopie , Zeolith , Zeolithsynthese , Natriumaluminiumsilicatglas , Bauwesen , Aluminiumsilicathydrat
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