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Sintered and unsintered pressed fly ash geopolymer: A comprehensive study on structural transformation in nitric and sulfuric acid

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cris.author.scopus-author-id 57219030010
cris.author.scopus-author-id 54402789500
cris.author.scopus-author-id 57204242778
cris.author.scopus-author-id 59160635200
cris.author.scopus-author-id 58955411400
cris.author.scopus-author-id 53164519100
cris.author.scopus-author-id 58575157400
cris.author.scopus-author-id 57226897182
cris.author.scopus-author-id 59161110300
cris.virtual.department Universiti Malaysia Perlis
cris.virtual.department Universiti Malaysia Perlis
cris.virtual.department Universiti Malaysia Perlis
cris.virtual.department Universiti Malaysia Perlis
cris.virtualsource.department ce68e3ec-253c-437a-96ef-1266da6595d7
cris.virtualsource.department 9414f569-850d-45d8-8fa2-e5f2c4194711
cris.virtualsource.department 748f28db-68c8-4b33-903a-8f3aa764a6ec
cris.virtualsource.department 1fb76e68-0c75-4529-ac9f-cf51941493f8
dc.contributor.author Shee-Ween O.
dc.contributor.author Heah Cheng Yong
dc.contributor.author Liew Yun Ming
dc.contributor.author Ho Li Ngee
dc.contributor.author Wei-Hao L.
dc.contributor.author Mohd. Mustafa Al Bakri Abdullah
dc.contributor.author Wei-Ken P.
dc.contributor.author Yong-Jie H.
dc.contributor.author Pin-Hsun L.
dc.date.accessioned 2024-09-27T01:13:18Z
dc.date.available 2024-09-27T01:13:18Z
dc.date.issued 2024-09-15
dc.description.abstract Acidic attacks contribute to the degradation of cementitious materials, diminishing the structural service life and increasing the requirement for maintenance of the structure. To address the limited understanding of the impact of the sintering process on the acid resistance of pressed geopolymer, an investigation and comparison of the acid resistance of room-cured (RPG) and sintered (SPG) pressed geopolymer was performed. Specimens were immersed in 3 % and 8 % nitric (HNO3) and sulfuric (H2SO4) acids for 7 and 28 days. Despite the higher sorptivity, SPG demonstrated better mechanical strength retention than that of RPG. Specifically, the compressive strength of SPG after 3 % of HNO3 immersion for 28 days increased (+14.2 %), surpassing the control specimen, while RPG experienced a 14.5 % strength drop. The strength increment in SPG was due to the further geopolymerization during acid immersion. In RPG, a new crystalline phase of NaNO3 was observed after immersion in 8 % HNO3 for 28 days. In contrast, SPG showed no evidence of NaNO3 formation, indicating lower reactivity with HNO3 compared to RPG. Additionally, both RPG and SPG exhibited gypsum formation after immersion in H2SO4. The presence of gypsum induced crack formation in RPG, whereas SPG, with its intensive cross-linked structure, effectively compensated for gypsum expansion, preventing crack formation. This finding is crucial for practical applications where exposure to aggressive acids is a concern, as it provides a method to enhance the acid resistance of geopolymer structures.
dc.identifier.doi 10.1016/j.jobe.2024.109823
dc.identifier.scopus 2-s2.0-85195292128
dc.identifier.uri https://hdl.handle.net/20.500.14170/3958
dc.relation.funding Ministry of Higher Education, Malaysia
dc.relation.grantno FRGS/1/2020/TK0/UNIMAP/02/42
dc.relation.ispartof Journal of Building Engineering
dc.relation.ispartofseries Journal of Building Engineering
dc.subject Acid attack | Cold pressing | Durability | Geopolymer | Sintering
dc.title Sintered and unsintered pressed fly ash geopolymer: A comprehensive study on structural transformation in nitric and sulfuric acid
dc.type Journal
dspace.entity.type Publication
oaire.citation.volume 93
oairecerif.affiliation.orgunit Universiti Malaysia Perlis
oairecerif.affiliation.orgunit Universiti Malaysia Perlis
oairecerif.affiliation.orgunit Universiti Malaysia Perlis
oairecerif.affiliation.orgunit Universiti Malaysia Perlis
oairecerif.affiliation.orgunit National Taipei University of Technology
oairecerif.affiliation.orgunit Universiti Malaysia Perlis
oairecerif.affiliation.orgunit Macro Dimension Concrete Sdn Bhd. PT48877
oairecerif.affiliation.orgunit Universiti Malaysia Perlis
oairecerif.affiliation.orgunit National Taipei University of Technology
oairecerif.author.affiliation #PLACEHOLDER_PARENT_METADATA_VALUE#
oairecerif.author.affiliation Universiti Malaysia Perlis
oairecerif.author.affiliation Universiti Malaysia Perlis
oairecerif.author.affiliation Universiti Malaysia Perlis
oairecerif.author.affiliation #PLACEHOLDER_PARENT_METADATA_VALUE#
oairecerif.author.affiliation Universiti Malaysia Perlis
oairecerif.author.affiliation #PLACEHOLDER_PARENT_METADATA_VALUE#
oairecerif.author.affiliation #PLACEHOLDER_PARENT_METADATA_VALUE#
oairecerif.author.affiliation #PLACEHOLDER_PARENT_METADATA_VALUE#
oairecerif.citation.number 109823
person.identifier.orcid 0000-0003-0256-6916
person.identifier.orcid 0000-0001-7093-7833
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person.identifier.orcid #PLACEHOLDER_PARENT_METADATA_VALUE#
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person.identifier.scopus-author-id 57219030010
person.identifier.scopus-author-id 54402789500
person.identifier.scopus-author-id 57204242778
person.identifier.scopus-author-id 59160635200
person.identifier.scopus-author-id 58955411400
person.identifier.scopus-author-id 53164519100
person.identifier.scopus-author-id 58575157400
person.identifier.scopus-author-id 57226897182
person.identifier.scopus-author-id 59161110300
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