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    Characterization of natural pozzolan-based geopolymeric binders

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    Type
    Article
    Authors
    Moon, Juhyuk
    Bae, Sungchul
    Celik, Kemal
    Yoon, Seyoon cc
    Kim, Ki-Hyun
    Kim, Kang Su
    Monteiro, Paulo J. M. cc
    KAUST Grant Number
    KUS-l1-004021
    Date
    2014-10
    Permanent link to this record
    http://hdl.handle.net/10754/597760
    
    Metadata
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    Abstract
    Properties and characteristics of fly ash- or slag-based geopolymers have been extensively explored but comparatively less information is available for natural pozzolan-based geopolymers. The present work focuses on microstructural characteristics of natural pozzolan-based geopolymers activated by sodium hydroxide and a mixture of sodium hydroxide and sodium silicate. Synchrotron XRD and SEM-EDS studies combined with compressive strength tests successfully demonstrate the feasibility of the use of natural pozzolan for sustainable construction material. It is concluded that the geopolymers have sufficient strength as structural materials and matrices contain C-S-H like crystal as well as zeolites of hydroxysodalite and zeolite Y. Two zeolites of hydroxysodalite and zeolite Y are found as the main activation products in sodium hydroxide activation. Substitution with sodium silicate solution yields higher compressive strength and a denser microstructure with dominant activation products of C-S-H like crystal, zeolite Y, and phillipsite. It has been proposed that the crystal size of the activation products ranges from 10 nm to 1 μm. Different microstructural characteristics found herein provide a valuable information to develop natural pozzolan-based sustainable structural materials with improved properties. © 2014 Elsevier Ltd. All rights reserved.
    Citation
    Moon J, Bae S, Celik K, Yoon S, Kim K-H, et al. (2014) Characterization of natural pozzolan-based geopolymeric binders. Cement and Concrete Composites 53: 97–104. Available: http://dx.doi.org/10.1016/j.cemconcomp.2014.06.010.
    Sponsors
    This research was funded by Award No. KUS-l1-004021, from King Abdullah University of Science and Technology. The Advanced Light Source is supported by the Director, Office of Science, Office of Basic Energy Sciences, of the U.S. Department of Energy under No. DE-AC02-05CH11231.
    Publisher
    Elsevier BV
    Journal
    Cement and Concrete Composites
    DOI
    10.1016/j.cemconcomp.2014.06.010
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.cemconcomp.2014.06.010
    Scopus Count
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