Effects of pre-setting chemical exchanges on geopolymers cast in saline waters

This paper presents an experimental investigation of the effects of pre-setting chemical exchanges on the mechanical and chemical properties of geopolymers cast and cured in saline solutions of 0, 15, and 35 ppt in concentration to mimic saline underground and underwater environments, using a mixtur...
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Gespeichert in:

Autor*in:	Ge, Xiaonan [verfasserIn] Guo, Brandon [verfasserIn] Guo, Dongdong [verfasserIn] Tao, Mingjiang [verfasserIn] Zhang, Guoping [verfasserIn]

Format:	E-Artikel
Sprache:	Englisch

Erschienen:	2021

Schlagwörter:	Fly ash Geopolymer Metakaolin Na/Al molar ratio Saline solution Strength

Übergeordnetes Werk:	Enthalten in: Construction and building materials - Amsterdam [u.a.] : Elsevier Science, 1987, 308
Übergeordnetes Werk:	volume:308

DOI / URN:	10.1016/j.conbuildmat.2021.125020

Katalog-ID:	ELV006852416

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520			\|a This paper presents an experimental investigation of the effects of pre-setting chemical exchanges on the mechanical and chemical properties of geopolymers cast and cured in saline solutions of 0, 15, and 35 ppt in concentration to mimic saline underground and underwater environments, using a mixture of Class C fly ash and metakaolin at a mass ratio of 1:1 as the raw material. While the Si/Al molar ratio of the studied geopolymer was fixed at 2.00, the Na/Al ratio varied from 0.67, 0.80, 0.84, to 1.00. Upon completion of 28-day curing, the mechanical properties, mineralogy, microstructure, and chemical compositions of the geopolymers were characterized by unconfined compression, X-ray diffraction, electron microscopy, and X-ray fluorescence, respectively, while changes in the pH and salinity of the curing solutions were also measured. Results show that the effect of casting and curing in saline solutions on mechanical properties depends upon both the solution’s salinity and geopolymer’s Na/Al ratio: while the strength of geopolymers with a Na/Al ratio of 0.67 and 0.80 increases with the salinity, the counterparts with a Na/Al ratio of 0.84 and 1.00 exhibit the opposite. The underlying mechanisms are actually the pre-setting chemical exchanges between the under-curing geopolymer slurry and curing water, which are retarded and mitigated by the setting and hardening of the geopolymer slurry. The new results uncover that there exists a critical Na/Al ratio for the highest mechanical strength of geopolymers cast in saline waters, and excessive Na+ cations diffused into the geopolymer slurry may be detrimental to the strength development.
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650		4	\|a Strength
700	1		\|a Guo, Brandon \|e verfasserin \|4 aut
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700	1		\|a Tao, Mingjiang \|e verfasserin \|4 aut
700	1		\|a Zhang, Guoping \|e verfasserin \|4 aut
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matchkey_str	gexiaonanguobrandonguodongdongtaomingjia:2021----:fetopeetnceiaecagsneplmr
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publishDate	2021
allfields	10.1016/j.conbuildmat.2021.125020 doi (DE-627)ELV006852416 (ELSEVIER)S0950-0618(21)02766-5 DE-627 ger DE-627 rda eng 690 DE-600 56.45 bkl Ge, Xiaonan verfasserin aut Effects of pre-setting chemical exchanges on geopolymers cast in saline waters 2021 nicht spezifiziert zzz rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier This paper presents an experimental investigation of the effects of pre-setting chemical exchanges on the mechanical and chemical properties of geopolymers cast and cured in saline solutions of 0, 15, and 35 ppt in concentration to mimic saline underground and underwater environments, using a mixture of Class C fly ash and metakaolin at a mass ratio of 1:1 as the raw material. While the Si/Al molar ratio of the studied geopolymer was fixed at 2.00, the Na/Al ratio varied from 0.67, 0.80, 0.84, to 1.00. Upon completion of 28-day curing, the mechanical properties, mineralogy, microstructure, and chemical compositions of the geopolymers were characterized by unconfined compression, X-ray diffraction, electron microscopy, and X-ray fluorescence, respectively, while changes in the pH and salinity of the curing solutions were also measured. Results show that the effect of casting and curing in saline solutions on mechanical properties depends upon both the solution’s salinity and geopolymer’s Na/Al ratio: while the strength of geopolymers with a Na/Al ratio of 0.67 and 0.80 increases with the salinity, the counterparts with a Na/Al ratio of 0.84 and 1.00 exhibit the opposite. The underlying mechanisms are actually the pre-setting chemical exchanges between the under-curing geopolymer slurry and curing water, which are retarded and mitigated by the setting and hardening of the geopolymer slurry. The new results uncover that there exists a critical Na/Al ratio for the highest mechanical strength of geopolymers cast in saline waters, and excessive Na+ cations diffused into the geopolymer slurry may be detrimental to the strength development. Fly ash Geopolymer Metakaolin Na/Al molar ratio Saline solution Strength Guo, Brandon verfasserin aut Guo, Dongdong verfasserin aut Tao, Mingjiang verfasserin aut Zhang, Guoping verfasserin aut Enthalten in Construction and building materials Amsterdam [u.a.] : Elsevier Science, 1987 308 Online-Ressource (DE-627)320423115 (DE-600)2002804-0 (DE-576)259271187 nnns volume:308 GBV_USEFLAG_U SYSFLAG_U GBV_ELV GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_90 GBV_ILN_95 GBV_ILN_100 GBV_ILN_105 GBV_ILN_110 GBV_ILN_150 GBV_ILN_151 GBV_ILN_224 GBV_ILN_370 GBV_ILN_602 GBV_ILN_702 GBV_ILN_2003 GBV_ILN_2004 GBV_ILN_2005 GBV_ILN_2006 GBV_ILN_2008 GBV_ILN_2010 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2027 GBV_ILN_2034 GBV_ILN_2038 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2049 GBV_ILN_2050 GBV_ILN_2056 GBV_ILN_2059 GBV_ILN_2061 GBV_ILN_2064 GBV_ILN_2065 GBV_ILN_2068 GBV_ILN_2088 GBV_ILN_2111 GBV_ILN_2112 GBV_ILN_2113 GBV_ILN_2118 GBV_ILN_2122 GBV_ILN_2129 GBV_ILN_2143 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_2152 GBV_ILN_2153 GBV_ILN_2190 GBV_ILN_2336 GBV_ILN_2470 GBV_ILN_2507 GBV_ILN_2522 GBV_ILN_4035 GBV_ILN_4037 GBV_ILN_4046 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4242 GBV_ILN_4251 GBV_ILN_4305 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4326 GBV_ILN_4333 GBV_ILN_4334 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4393 56.45 Baustoffkunde AR 308
spelling	10.1016/j.conbuildmat.2021.125020 doi (DE-627)ELV006852416 (ELSEVIER)S0950-0618(21)02766-5 DE-627 ger DE-627 rda eng 690 DE-600 56.45 bkl Ge, Xiaonan verfasserin aut Effects of pre-setting chemical exchanges on geopolymers cast in saline waters 2021 nicht spezifiziert zzz rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier This paper presents an experimental investigation of the effects of pre-setting chemical exchanges on the mechanical and chemical properties of geopolymers cast and cured in saline solutions of 0, 15, and 35 ppt in concentration to mimic saline underground and underwater environments, using a mixture of Class C fly ash and metakaolin at a mass ratio of 1:1 as the raw material. While the Si/Al molar ratio of the studied geopolymer was fixed at 2.00, the Na/Al ratio varied from 0.67, 0.80, 0.84, to 1.00. Upon completion of 28-day curing, the mechanical properties, mineralogy, microstructure, and chemical compositions of the geopolymers were characterized by unconfined compression, X-ray diffraction, electron microscopy, and X-ray fluorescence, respectively, while changes in the pH and salinity of the curing solutions were also measured. Results show that the effect of casting and curing in saline solutions on mechanical properties depends upon both the solution’s salinity and geopolymer’s Na/Al ratio: while the strength of geopolymers with a Na/Al ratio of 0.67 and 0.80 increases with the salinity, the counterparts with a Na/Al ratio of 0.84 and 1.00 exhibit the opposite. The underlying mechanisms are actually the pre-setting chemical exchanges between the under-curing geopolymer slurry and curing water, which are retarded and mitigated by the setting and hardening of the geopolymer slurry. The new results uncover that there exists a critical Na/Al ratio for the highest mechanical strength of geopolymers cast in saline waters, and excessive Na+ cations diffused into the geopolymer slurry may be detrimental to the strength development. Fly ash Geopolymer Metakaolin Na/Al molar ratio Saline solution Strength Guo, Brandon verfasserin aut Guo, Dongdong verfasserin aut Tao, Mingjiang verfasserin aut Zhang, Guoping verfasserin aut Enthalten in Construction and building materials Amsterdam [u.a.] : Elsevier Science, 1987 308 Online-Ressource (DE-627)320423115 (DE-600)2002804-0 (DE-576)259271187 nnns volume:308 GBV_USEFLAG_U SYSFLAG_U GBV_ELV GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_90 GBV_ILN_95 GBV_ILN_100 GBV_ILN_105 GBV_ILN_110 GBV_ILN_150 GBV_ILN_151 GBV_ILN_224 GBV_ILN_370 GBV_ILN_602 GBV_ILN_702 GBV_ILN_2003 GBV_ILN_2004 GBV_ILN_2005 GBV_ILN_2006 GBV_ILN_2008 GBV_ILN_2010 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2027 GBV_ILN_2034 GBV_ILN_2038 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2049 GBV_ILN_2050 GBV_ILN_2056 GBV_ILN_2059 GBV_ILN_2061 GBV_ILN_2064 GBV_ILN_2065 GBV_ILN_2068 GBV_ILN_2088 GBV_ILN_2111 GBV_ILN_2112 GBV_ILN_2113 GBV_ILN_2118 GBV_ILN_2122 GBV_ILN_2129 GBV_ILN_2143 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_2152 GBV_ILN_2153 GBV_ILN_2190 GBV_ILN_2336 GBV_ILN_2470 GBV_ILN_2507 GBV_ILN_2522 GBV_ILN_4035 GBV_ILN_4037 GBV_ILN_4046 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4242 GBV_ILN_4251 GBV_ILN_4305 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4326 GBV_ILN_4333 GBV_ILN_4334 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4393 56.45 Baustoffkunde AR 308
allfields_unstemmed	10.1016/j.conbuildmat.2021.125020 doi (DE-627)ELV006852416 (ELSEVIER)S0950-0618(21)02766-5 DE-627 ger DE-627 rda eng 690 DE-600 56.45 bkl Ge, Xiaonan verfasserin aut Effects of pre-setting chemical exchanges on geopolymers cast in saline waters 2021 nicht spezifiziert zzz rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier This paper presents an experimental investigation of the effects of pre-setting chemical exchanges on the mechanical and chemical properties of geopolymers cast and cured in saline solutions of 0, 15, and 35 ppt in concentration to mimic saline underground and underwater environments, using a mixture of Class C fly ash and metakaolin at a mass ratio of 1:1 as the raw material. While the Si/Al molar ratio of the studied geopolymer was fixed at 2.00, the Na/Al ratio varied from 0.67, 0.80, 0.84, to 1.00. Upon completion of 28-day curing, the mechanical properties, mineralogy, microstructure, and chemical compositions of the geopolymers were characterized by unconfined compression, X-ray diffraction, electron microscopy, and X-ray fluorescence, respectively, while changes in the pH and salinity of the curing solutions were also measured. Results show that the effect of casting and curing in saline solutions on mechanical properties depends upon both the solution’s salinity and geopolymer’s Na/Al ratio: while the strength of geopolymers with a Na/Al ratio of 0.67 and 0.80 increases with the salinity, the counterparts with a Na/Al ratio of 0.84 and 1.00 exhibit the opposite. The underlying mechanisms are actually the pre-setting chemical exchanges between the under-curing geopolymer slurry and curing water, which are retarded and mitigated by the setting and hardening of the geopolymer slurry. The new results uncover that there exists a critical Na/Al ratio for the highest mechanical strength of geopolymers cast in saline waters, and excessive Na+ cations diffused into the geopolymer slurry may be detrimental to the strength development. Fly ash Geopolymer Metakaolin Na/Al molar ratio Saline solution Strength Guo, Brandon verfasserin aut Guo, Dongdong verfasserin aut Tao, Mingjiang verfasserin aut Zhang, Guoping verfasserin aut Enthalten in Construction and building materials Amsterdam [u.a.] : Elsevier Science, 1987 308 Online-Ressource (DE-627)320423115 (DE-600)2002804-0 (DE-576)259271187 nnns volume:308 GBV_USEFLAG_U SYSFLAG_U GBV_ELV GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_90 GBV_ILN_95 GBV_ILN_100 GBV_ILN_105 GBV_ILN_110 GBV_ILN_150 GBV_ILN_151 GBV_ILN_224 GBV_ILN_370 GBV_ILN_602 GBV_ILN_702 GBV_ILN_2003 GBV_ILN_2004 GBV_ILN_2005 GBV_ILN_2006 GBV_ILN_2008 GBV_ILN_2010 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2027 GBV_ILN_2034 GBV_ILN_2038 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2049 GBV_ILN_2050 GBV_ILN_2056 GBV_ILN_2059 GBV_ILN_2061 GBV_ILN_2064 GBV_ILN_2065 GBV_ILN_2068 GBV_ILN_2088 GBV_ILN_2111 GBV_ILN_2112 GBV_ILN_2113 GBV_ILN_2118 GBV_ILN_2122 GBV_ILN_2129 GBV_ILN_2143 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_2152 GBV_ILN_2153 GBV_ILN_2190 GBV_ILN_2336 GBV_ILN_2470 GBV_ILN_2507 GBV_ILN_2522 GBV_ILN_4035 GBV_ILN_4037 GBV_ILN_4046 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4242 GBV_ILN_4251 GBV_ILN_4305 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4326 GBV_ILN_4333 GBV_ILN_4334 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4393 56.45 Baustoffkunde AR 308
allfieldsGer	10.1016/j.conbuildmat.2021.125020 doi (DE-627)ELV006852416 (ELSEVIER)S0950-0618(21)02766-5 DE-627 ger DE-627 rda eng 690 DE-600 56.45 bkl Ge, Xiaonan verfasserin aut Effects of pre-setting chemical exchanges on geopolymers cast in saline waters 2021 nicht spezifiziert zzz rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier This paper presents an experimental investigation of the effects of pre-setting chemical exchanges on the mechanical and chemical properties of geopolymers cast and cured in saline solutions of 0, 15, and 35 ppt in concentration to mimic saline underground and underwater environments, using a mixture of Class C fly ash and metakaolin at a mass ratio of 1:1 as the raw material. While the Si/Al molar ratio of the studied geopolymer was fixed at 2.00, the Na/Al ratio varied from 0.67, 0.80, 0.84, to 1.00. Upon completion of 28-day curing, the mechanical properties, mineralogy, microstructure, and chemical compositions of the geopolymers were characterized by unconfined compression, X-ray diffraction, electron microscopy, and X-ray fluorescence, respectively, while changes in the pH and salinity of the curing solutions were also measured. Results show that the effect of casting and curing in saline solutions on mechanical properties depends upon both the solution’s salinity and geopolymer’s Na/Al ratio: while the strength of geopolymers with a Na/Al ratio of 0.67 and 0.80 increases with the salinity, the counterparts with a Na/Al ratio of 0.84 and 1.00 exhibit the opposite. The underlying mechanisms are actually the pre-setting chemical exchanges between the under-curing geopolymer slurry and curing water, which are retarded and mitigated by the setting and hardening of the geopolymer slurry. The new results uncover that there exists a critical Na/Al ratio for the highest mechanical strength of geopolymers cast in saline waters, and excessive Na+ cations diffused into the geopolymer slurry may be detrimental to the strength development. Fly ash Geopolymer Metakaolin Na/Al molar ratio Saline solution Strength Guo, Brandon verfasserin aut Guo, Dongdong verfasserin aut Tao, Mingjiang verfasserin aut Zhang, Guoping verfasserin aut Enthalten in Construction and building materials Amsterdam [u.a.] : Elsevier Science, 1987 308 Online-Ressource (DE-627)320423115 (DE-600)2002804-0 (DE-576)259271187 nnns volume:308 GBV_USEFLAG_U SYSFLAG_U GBV_ELV GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_90 GBV_ILN_95 GBV_ILN_100 GBV_ILN_105 GBV_ILN_110 GBV_ILN_150 GBV_ILN_151 GBV_ILN_224 GBV_ILN_370 GBV_ILN_602 GBV_ILN_702 GBV_ILN_2003 GBV_ILN_2004 GBV_ILN_2005 GBV_ILN_2006 GBV_ILN_2008 GBV_ILN_2010 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2027 GBV_ILN_2034 GBV_ILN_2038 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2049 GBV_ILN_2050 GBV_ILN_2056 GBV_ILN_2059 GBV_ILN_2061 GBV_ILN_2064 GBV_ILN_2065 GBV_ILN_2068 GBV_ILN_2088 GBV_ILN_2111 GBV_ILN_2112 GBV_ILN_2113 GBV_ILN_2118 GBV_ILN_2122 GBV_ILN_2129 GBV_ILN_2143 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_2152 GBV_ILN_2153 GBV_ILN_2190 GBV_ILN_2336 GBV_ILN_2470 GBV_ILN_2507 GBV_ILN_2522 GBV_ILN_4035 GBV_ILN_4037 GBV_ILN_4046 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4242 GBV_ILN_4251 GBV_ILN_4305 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4326 GBV_ILN_4333 GBV_ILN_4334 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4393 56.45 Baustoffkunde AR 308
allfieldsSound	10.1016/j.conbuildmat.2021.125020 doi (DE-627)ELV006852416 (ELSEVIER)S0950-0618(21)02766-5 DE-627 ger DE-627 rda eng 690 DE-600 56.45 bkl Ge, Xiaonan verfasserin aut Effects of pre-setting chemical exchanges on geopolymers cast in saline waters 2021 nicht spezifiziert zzz rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier This paper presents an experimental investigation of the effects of pre-setting chemical exchanges on the mechanical and chemical properties of geopolymers cast and cured in saline solutions of 0, 15, and 35 ppt in concentration to mimic saline underground and underwater environments, using a mixture of Class C fly ash and metakaolin at a mass ratio of 1:1 as the raw material. While the Si/Al molar ratio of the studied geopolymer was fixed at 2.00, the Na/Al ratio varied from 0.67, 0.80, 0.84, to 1.00. Upon completion of 28-day curing, the mechanical properties, mineralogy, microstructure, and chemical compositions of the geopolymers were characterized by unconfined compression, X-ray diffraction, electron microscopy, and X-ray fluorescence, respectively, while changes in the pH and salinity of the curing solutions were also measured. Results show that the effect of casting and curing in saline solutions on mechanical properties depends upon both the solution’s salinity and geopolymer’s Na/Al ratio: while the strength of geopolymers with a Na/Al ratio of 0.67 and 0.80 increases with the salinity, the counterparts with a Na/Al ratio of 0.84 and 1.00 exhibit the opposite. The underlying mechanisms are actually the pre-setting chemical exchanges between the under-curing geopolymer slurry and curing water, which are retarded and mitigated by the setting and hardening of the geopolymer slurry. The new results uncover that there exists a critical Na/Al ratio for the highest mechanical strength of geopolymers cast in saline waters, and excessive Na+ cations diffused into the geopolymer slurry may be detrimental to the strength development. Fly ash Geopolymer Metakaolin Na/Al molar ratio Saline solution Strength Guo, Brandon verfasserin aut Guo, Dongdong verfasserin aut Tao, Mingjiang verfasserin aut Zhang, Guoping verfasserin aut Enthalten in Construction and building materials Amsterdam [u.a.] : Elsevier Science, 1987 308 Online-Ressource (DE-627)320423115 (DE-600)2002804-0 (DE-576)259271187 nnns volume:308 GBV_USEFLAG_U SYSFLAG_U GBV_ELV GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_90 GBV_ILN_95 GBV_ILN_100 GBV_ILN_105 GBV_ILN_110 GBV_ILN_150 GBV_ILN_151 GBV_ILN_224 GBV_ILN_370 GBV_ILN_602 GBV_ILN_702 GBV_ILN_2003 GBV_ILN_2004 GBV_ILN_2005 GBV_ILN_2006 GBV_ILN_2008 GBV_ILN_2010 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2027 GBV_ILN_2034 GBV_ILN_2038 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2049 GBV_ILN_2050 GBV_ILN_2056 GBV_ILN_2059 GBV_ILN_2061 GBV_ILN_2064 GBV_ILN_2065 GBV_ILN_2068 GBV_ILN_2088 GBV_ILN_2111 GBV_ILN_2112 GBV_ILN_2113 GBV_ILN_2118 GBV_ILN_2122 GBV_ILN_2129 GBV_ILN_2143 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_2152 GBV_ILN_2153 GBV_ILN_2190 GBV_ILN_2336 GBV_ILN_2470 GBV_ILN_2507 GBV_ILN_2522 GBV_ILN_4035 GBV_ILN_4037 GBV_ILN_4046 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4242 GBV_ILN_4251 GBV_ILN_4305 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4326 GBV_ILN_4333 GBV_ILN_4334 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4393 56.45 Baustoffkunde AR 308
language	English
source	Enthalten in Construction and building materials 308 volume:308
sourceStr	Enthalten in Construction and building materials 308 volume:308
format_phy_str_mv	Article
bklname	Baustoffkunde
institution	findex.gbv.de
topic_facet	Fly ash Geopolymer Metakaolin Na/Al molar ratio Saline solution Strength
dewey-raw	690
isfreeaccess_bool	false
container_title	Construction and building materials
authorswithroles_txt_mv	Ge, Xiaonan @@aut@@ Guo, Brandon @@aut@@ Guo, Dongdong @@aut@@ Tao, Mingjiang @@aut@@ Zhang, Guoping @@aut@@
publishDateDaySort_date	2021-01-01T00:00:00Z
hierarchy_top_id	320423115
dewey-sort	3690
id	ELV006852416
language_de	englisch
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While the Si/Al molar ratio of the studied geopolymer was fixed at 2.00, the Na/Al ratio varied from 0.67, 0.80, 0.84, to 1.00. Upon completion of 28-day curing, the mechanical properties, mineralogy, microstructure, and chemical compositions of the geopolymers were characterized by unconfined compression, X-ray diffraction, electron microscopy, and X-ray fluorescence, respectively, while changes in the pH and salinity of the curing solutions were also measured. Results show that the effect of casting and curing in saline solutions on mechanical properties depends upon both the solution’s salinity and geopolymer’s Na/Al ratio: while the strength of geopolymers with a Na/Al ratio of 0.67 and 0.80 increases with the salinity, the counterparts with a Na/Al ratio of 0.84 and 1.00 exhibit the opposite. 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author	Ge, Xiaonan
spellingShingle	Ge, Xiaonan ddc 690 bkl 56.45 misc Fly ash misc Geopolymer misc Metakaolin misc Na/Al molar ratio misc Saline solution misc Strength Effects of pre-setting chemical exchanges on geopolymers cast in saline waters
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topic_title	690 DE-600 56.45 bkl Effects of pre-setting chemical exchanges on geopolymers cast in saline waters Fly ash Geopolymer Metakaolin Na/Al molar ratio Saline solution Strength
topic	ddc 690 bkl 56.45 misc Fly ash misc Geopolymer misc Metakaolin misc Na/Al molar ratio misc Saline solution misc Strength
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title	Effects of pre-setting chemical exchanges on geopolymers cast in saline waters
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title_full	Effects of pre-setting chemical exchanges on geopolymers cast in saline waters
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title_sort	effects of pre-setting chemical exchanges on geopolymers cast in saline waters
title_auth	Effects of pre-setting chemical exchanges on geopolymers cast in saline waters
abstract	This paper presents an experimental investigation of the effects of pre-setting chemical exchanges on the mechanical and chemical properties of geopolymers cast and cured in saline solutions of 0, 15, and 35 ppt in concentration to mimic saline underground and underwater environments, using a mixture of Class C fly ash and metakaolin at a mass ratio of 1:1 as the raw material. While the Si/Al molar ratio of the studied geopolymer was fixed at 2.00, the Na/Al ratio varied from 0.67, 0.80, 0.84, to 1.00. Upon completion of 28-day curing, the mechanical properties, mineralogy, microstructure, and chemical compositions of the geopolymers were characterized by unconfined compression, X-ray diffraction, electron microscopy, and X-ray fluorescence, respectively, while changes in the pH and salinity of the curing solutions were also measured. Results show that the effect of casting and curing in saline solutions on mechanical properties depends upon both the solution’s salinity and geopolymer’s Na/Al ratio: while the strength of geopolymers with a Na/Al ratio of 0.67 and 0.80 increases with the salinity, the counterparts with a Na/Al ratio of 0.84 and 1.00 exhibit the opposite. The underlying mechanisms are actually the pre-setting chemical exchanges between the under-curing geopolymer slurry and curing water, which are retarded and mitigated by the setting and hardening of the geopolymer slurry. The new results uncover that there exists a critical Na/Al ratio for the highest mechanical strength of geopolymers cast in saline waters, and excessive Na+ cations diffused into the geopolymer slurry may be detrimental to the strength development.
abstractGer	This paper presents an experimental investigation of the effects of pre-setting chemical exchanges on the mechanical and chemical properties of geopolymers cast and cured in saline solutions of 0, 15, and 35 ppt in concentration to mimic saline underground and underwater environments, using a mixture of Class C fly ash and metakaolin at a mass ratio of 1:1 as the raw material. While the Si/Al molar ratio of the studied geopolymer was fixed at 2.00, the Na/Al ratio varied from 0.67, 0.80, 0.84, to 1.00. Upon completion of 28-day curing, the mechanical properties, mineralogy, microstructure, and chemical compositions of the geopolymers were characterized by unconfined compression, X-ray diffraction, electron microscopy, and X-ray fluorescence, respectively, while changes in the pH and salinity of the curing solutions were also measured. Results show that the effect of casting and curing in saline solutions on mechanical properties depends upon both the solution’s salinity and geopolymer’s Na/Al ratio: while the strength of geopolymers with a Na/Al ratio of 0.67 and 0.80 increases with the salinity, the counterparts with a Na/Al ratio of 0.84 and 1.00 exhibit the opposite. The underlying mechanisms are actually the pre-setting chemical exchanges between the under-curing geopolymer slurry and curing water, which are retarded and mitigated by the setting and hardening of the geopolymer slurry. The new results uncover that there exists a critical Na/Al ratio for the highest mechanical strength of geopolymers cast in saline waters, and excessive Na+ cations diffused into the geopolymer slurry may be detrimental to the strength development.
abstract_unstemmed	This paper presents an experimental investigation of the effects of pre-setting chemical exchanges on the mechanical and chemical properties of geopolymers cast and cured in saline solutions of 0, 15, and 35 ppt in concentration to mimic saline underground and underwater environments, using a mixture of Class C fly ash and metakaolin at a mass ratio of 1:1 as the raw material. While the Si/Al molar ratio of the studied geopolymer was fixed at 2.00, the Na/Al ratio varied from 0.67, 0.80, 0.84, to 1.00. Upon completion of 28-day curing, the mechanical properties, mineralogy, microstructure, and chemical compositions of the geopolymers were characterized by unconfined compression, X-ray diffraction, electron microscopy, and X-ray fluorescence, respectively, while changes in the pH and salinity of the curing solutions were also measured. Results show that the effect of casting and curing in saline solutions on mechanical properties depends upon both the solution’s salinity and geopolymer’s Na/Al ratio: while the strength of geopolymers with a Na/Al ratio of 0.67 and 0.80 increases with the salinity, the counterparts with a Na/Al ratio of 0.84 and 1.00 exhibit the opposite. The underlying mechanisms are actually the pre-setting chemical exchanges between the under-curing geopolymer slurry and curing water, which are retarded and mitigated by the setting and hardening of the geopolymer slurry. The new results uncover that there exists a critical Na/Al ratio for the highest mechanical strength of geopolymers cast in saline waters, and excessive Na+ cations diffused into the geopolymer slurry may be detrimental to the strength development.
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title_short	Effects of pre-setting chemical exchanges on geopolymers cast in saline waters
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up_date	2024-07-06T22:46:20.800Z
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Effects of pre-setting chemical exchanges on geopolymers cast in saline waters

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Zugang & Verfügbarkeit

Vorhandene Bände

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