Prediction of the Maximum Compressive Strength Geopolymers Using the Method of Weighted Chemical Compositions of Binders
Publication: Journal of Materials in Civil Engineering
Volume 34, Issue 11
Abstract
Geopolymers are composite hard materials made by mixing solid binders such as fly ash and slag, and alkaline liquid activators such as NaOH and sodium silicate. Geopolymers have recently been developed to be used as a replacement for portland cement concrete. Industrial by-products, such as fly ash, steel making slags and garbage melting furnace slags, can be used to create geopolymers in a process that emits less carbon dioxide than does cement making. This reduction in emission is important because is one of the substances known to contribute to global warming. In the future, further uses of these fly ashes and slags must be explored. The development of high compressive strength geopolymers using fly ash and slags will strongly contribute to the fields of construction, geotechnical engineering, and architecture. The compressive strength of geopolymers, , is generally considered to be a function of the weight ratio of activator to binder, , and the weight ratio of NaOH to sodium silicate, . The maximum compressive strength, , is determined as the maximum value among the peak values of , which were obtained for various values of and . The values of w and that yield the maximum compressive strength, , are defined as the optimum values and , respectively. When designing geopolymers, it is essential to establish a method to predict using the chemical compositions of the binders only. This research first determines the chemical and physical properties of geopolymer materials by using scanning electron microscopy (SEM) and X-ray diffraction (XRD) observations, and then determines the mechanical properties of , and finally devises a method to predict by combining , , and CaO in binders.
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Data Availability Statement
All data, models, and code generated or used during the study appear in the published article.
Acknowledgments
The authors are grateful to Maruwa Giken for preparing ground solid waste incinerator slags. The authors are also grateful to Kyuden Sangyo, Shunan Works (Nissin Steel), and Nippon Steel & Sumikin for contributing coal-fired power plant ash, stainless manufactured slag, and ground granulated blast slag, respectively.
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© 2022 American Society of Civil Engineers.
History
Received: Sep 2, 2021
Accepted: Mar 3, 2022
Published online: Aug 24, 2022
Published in print: Nov 1, 2022
Discussion open until: Jan 24, 2023
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