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The effects of calcium content of fly ash on hydration and microstructure of ultra-high performance concrete (UHPC)
In this study, the effects of low-calcium fly ash (LFA) and high-calcium fly ash (HFA) on C–S–H structure, hydration products, hydration heat, and compressive strength of UHPC paste/concrete were investigated and compared via XPS, MIP, FT-IR, 29Si NMR, XRD, SEM, and the thermal analysis method. The...
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Published in: | Journal of cleaner production 2023-08, Vol.415, p.137735, Article 137735 |
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description | In this study, the effects of low-calcium fly ash (LFA) and high-calcium fly ash (HFA) on C–S–H structure, hydration products, hydration heat, and compressive strength of UHPC paste/concrete were investigated and compared via XPS, MIP, FT-IR, 29Si NMR, XRD, SEM, and the thermal analysis method. The results showed that fly ash reduced the rate of exothermic hydration and early strength, but it increased the compressive strength and reduced the porosity in the middle and late ages, and denied the microstructure of UHPC. By contrast, HFA exhibited the higher band fluctuation of Si–O and Al–O and lower Ca2p-Si2p energy separation values, which indicated that more amorphous silicon oxide and alumina participated in the pozzolanic reaction. This also demonstrated that HFA played an important role in enhancing the polymerization degree and increasing a higher level of Al-substitution for Si in C–S–H than LFA. HFA enhanced the pore volume with diameters less than 10 nm from 28 to 90 days due to pozzolanic reaction and filling effect, whereas the LFA mainly played a filling role and a lower pozzolanic reaction during this period. Durability results showed that fly ash reduced the drying shrinkage and chloride impermeability coefficient of UHPC, and the effect of HFA was better than that of LFA.
•The effects of low-calcium fly ash (LFA) and high-calcium fly ash (HFA) on C–S–H structure, hydration products, hydration heat, and compressive strength of UHPC paste/concrete were investigated and compared.•HFA exhibited the higher band fluctuation of Si–O and Al–O and lower Ca2p-Si2p energy separation values, which indicated that more amorphous silicon oxide and alumina participated in the pozzolanic reaction.•HFA played an important role in enhancing the polymerization degree and increasing a higher level of Al-substitution for Si in C–S–H than LFA.•HFA enhanced the pore volume with diameters less than 10 nm from 28 to 90 d due to pozzolanic reaction and filling effect, whereas the LFA mainly played a filling role and a lower pozzolanic reaction during this period. |
doi_str_mv | 10.1016/j.jclepro.2023.137735 |
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•The effects of low-calcium fly ash (LFA) and high-calcium fly ash (HFA) on C–S–H structure, hydration products, hydration heat, and compressive strength of UHPC paste/concrete were investigated and compared.•HFA exhibited the higher band fluctuation of Si–O and Al–O and lower Ca2p-Si2p energy separation values, which indicated that more amorphous silicon oxide and alumina participated in the pozzolanic reaction.•HFA played an important role in enhancing the polymerization degree and increasing a higher level of Al-substitution for Si in C–S–H than LFA.•HFA enhanced the pore volume with diameters less than 10 nm from 28 to 90 d due to pozzolanic reaction and filling effect, whereas the LFA mainly played a filling role and a lower pozzolanic reaction during this period.</description><identifier>ISSN: 0959-6526</identifier><identifier>EISSN: 1879-1786</identifier><identifier>DOI: 10.1016/j.jclepro.2023.137735</identifier><language>eng</language><publisher>Elsevier Ltd</publisher><subject>aluminum oxide ; calcium ; chlorides ; compression strength ; concrete ; C–S–H ; durability ; energy ; fly ash ; heat production ; High-calcium fly ash ; Low-calcium fly ash ; Microstructure ; polymerization ; porosity ; shrinkage ; silica ; thermal analysis ; UHPC</subject><ispartof>Journal of cleaner production, 2023-08, Vol.415, p.137735, Article 137735</ispartof><rights>2023 Elsevier Ltd</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c342t-8c6bd3768afc4425c0884d69fc678d2cad55d66d5db7e45fc91c83923cc177613</citedby><cites>FETCH-LOGICAL-c342t-8c6bd3768afc4425c0884d69fc678d2cad55d66d5db7e45fc91c83923cc177613</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,776,780,27901,27902</link.rule.ids></links><search><creatorcontrib>Luan, Congqi</creatorcontrib><creatorcontrib>Wu, Zhenming</creatorcontrib><creatorcontrib>Han, Zipeng</creatorcontrib><creatorcontrib>Gao, Xin</creatorcontrib><creatorcontrib>Zhou, Zonghui</creatorcontrib><creatorcontrib>Du, Peng</creatorcontrib><creatorcontrib>Wu, Fengnian</creatorcontrib><creatorcontrib>Du, Shuang</creatorcontrib><creatorcontrib>Huang, Yongbo</creatorcontrib><title>The effects of calcium content of fly ash on hydration and microstructure of ultra-high performance concrete (UHPC)</title><title>Journal of cleaner production</title><description>In this study, the effects of low-calcium fly ash (LFA) and high-calcium fly ash (HFA) on C–S–H structure, hydration products, hydration heat, and compressive strength of UHPC paste/concrete were investigated and compared via XPS, MIP, FT-IR, 29Si NMR, XRD, SEM, and the thermal analysis method. The results showed that fly ash reduced the rate of exothermic hydration and early strength, but it increased the compressive strength and reduced the porosity in the middle and late ages, and denied the microstructure of UHPC. By contrast, HFA exhibited the higher band fluctuation of Si–O and Al–O and lower Ca2p-Si2p energy separation values, which indicated that more amorphous silicon oxide and alumina participated in the pozzolanic reaction. This also demonstrated that HFA played an important role in enhancing the polymerization degree and increasing a higher level of Al-substitution for Si in C–S–H than LFA. HFA enhanced the pore volume with diameters less than 10 nm from 28 to 90 days due to pozzolanic reaction and filling effect, whereas the LFA mainly played a filling role and a lower pozzolanic reaction during this period. Durability results showed that fly ash reduced the drying shrinkage and chloride impermeability coefficient of UHPC, and the effect of HFA was better than that of LFA.
•The effects of low-calcium fly ash (LFA) and high-calcium fly ash (HFA) on C–S–H structure, hydration products, hydration heat, and compressive strength of UHPC paste/concrete were investigated and compared.•HFA exhibited the higher band fluctuation of Si–O and Al–O and lower Ca2p-Si2p energy separation values, which indicated that more amorphous silicon oxide and alumina participated in the pozzolanic reaction.•HFA played an important role in enhancing the polymerization degree and increasing a higher level of Al-substitution for Si in C–S–H than LFA.•HFA enhanced the pore volume with diameters less than 10 nm from 28 to 90 d due to pozzolanic reaction and filling effect, whereas the LFA mainly played a filling role and a lower pozzolanic reaction during this period.</description><subject>aluminum oxide</subject><subject>calcium</subject><subject>chlorides</subject><subject>compression strength</subject><subject>concrete</subject><subject>C–S–H</subject><subject>durability</subject><subject>energy</subject><subject>fly ash</subject><subject>heat production</subject><subject>High-calcium fly ash</subject><subject>Low-calcium fly ash</subject><subject>Microstructure</subject><subject>polymerization</subject><subject>porosity</subject><subject>shrinkage</subject><subject>silica</subject><subject>thermal analysis</subject><subject>UHPC</subject><issn>0959-6526</issn><issn>1879-1786</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2023</creationdate><recordtype>article</recordtype><recordid>eNqFkEtrHDEQhIWJwZt1fkJAR_swGz1G0swpmCWOAwb7YJ-F3Gp5tMxjI2kC--89w_qeUzdNVTX1EfKdsx1nXP847A7Q4zFNO8GE3HFpjFQXZMMb01bcNPoL2bBWtZVWQl-RrzkfGOOGmXpD8kuHFENAKJlOgYLrIc4DhWksOJb1FPoTdbmj00i7k0-uxGVzo6dDhDTlkmYoc8JVOvcluaqL7x09YgpTGtwIuIZBwoL05vXheX97TS6D6zN--5xb8nr_62X_UD0-_f6zv3usQNaiVA3oNy-NblyAuhYKWNPUXrcBtGm8AOeV8lp75d8M1ipAy6GRrZAA3BjN5ZbcnHMXNH9nzMUOMQP2vRtxmrMVrRBMsuXDIlVn6dooJwz2mOLg0slyZlfI9mA_IdsVsj1DXnw_zz5cevyLmGyGiEtnH9OC1Pop_ifhA6VPiVQ</recordid><startdate>20230820</startdate><enddate>20230820</enddate><creator>Luan, Congqi</creator><creator>Wu, Zhenming</creator><creator>Han, Zipeng</creator><creator>Gao, Xin</creator><creator>Zhou, Zonghui</creator><creator>Du, Peng</creator><creator>Wu, Fengnian</creator><creator>Du, Shuang</creator><creator>Huang, Yongbo</creator><general>Elsevier Ltd</general><scope>AAYXX</scope><scope>CITATION</scope><scope>7S9</scope><scope>L.6</scope></search><sort><creationdate>20230820</creationdate><title>The effects of calcium content of fly ash on hydration and microstructure of ultra-high performance concrete (UHPC)</title><author>Luan, Congqi ; Wu, Zhenming ; Han, Zipeng ; Gao, Xin ; Zhou, Zonghui ; Du, Peng ; Wu, Fengnian ; Du, Shuang ; Huang, Yongbo</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c342t-8c6bd3768afc4425c0884d69fc678d2cad55d66d5db7e45fc91c83923cc177613</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2023</creationdate><topic>aluminum oxide</topic><topic>calcium</topic><topic>chlorides</topic><topic>compression strength</topic><topic>concrete</topic><topic>C–S–H</topic><topic>durability</topic><topic>energy</topic><topic>fly ash</topic><topic>heat production</topic><topic>High-calcium fly ash</topic><topic>Low-calcium fly ash</topic><topic>Microstructure</topic><topic>polymerization</topic><topic>porosity</topic><topic>shrinkage</topic><topic>silica</topic><topic>thermal analysis</topic><topic>UHPC</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Luan, Congqi</creatorcontrib><creatorcontrib>Wu, Zhenming</creatorcontrib><creatorcontrib>Han, Zipeng</creatorcontrib><creatorcontrib>Gao, Xin</creatorcontrib><creatorcontrib>Zhou, Zonghui</creatorcontrib><creatorcontrib>Du, Peng</creatorcontrib><creatorcontrib>Wu, Fengnian</creatorcontrib><creatorcontrib>Du, Shuang</creatorcontrib><creatorcontrib>Huang, Yongbo</creatorcontrib><collection>CrossRef</collection><collection>AGRICOLA</collection><collection>AGRICOLA - Academic</collection><jtitle>Journal of cleaner production</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Luan, Congqi</au><au>Wu, Zhenming</au><au>Han, Zipeng</au><au>Gao, Xin</au><au>Zhou, Zonghui</au><au>Du, Peng</au><au>Wu, Fengnian</au><au>Du, Shuang</au><au>Huang, Yongbo</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>The effects of calcium content of fly ash on hydration and microstructure of ultra-high performance concrete (UHPC)</atitle><jtitle>Journal of cleaner production</jtitle><date>2023-08-20</date><risdate>2023</risdate><volume>415</volume><spage>137735</spage><pages>137735-</pages><artnum>137735</artnum><issn>0959-6526</issn><eissn>1879-1786</eissn><abstract>In this study, the effects of low-calcium fly ash (LFA) and high-calcium fly ash (HFA) on C–S–H structure, hydration products, hydration heat, and compressive strength of UHPC paste/concrete were investigated and compared via XPS, MIP, FT-IR, 29Si NMR, XRD, SEM, and the thermal analysis method. The results showed that fly ash reduced the rate of exothermic hydration and early strength, but it increased the compressive strength and reduced the porosity in the middle and late ages, and denied the microstructure of UHPC. By contrast, HFA exhibited the higher band fluctuation of Si–O and Al–O and lower Ca2p-Si2p energy separation values, which indicated that more amorphous silicon oxide and alumina participated in the pozzolanic reaction. This also demonstrated that HFA played an important role in enhancing the polymerization degree and increasing a higher level of Al-substitution for Si in C–S–H than LFA. HFA enhanced the pore volume with diameters less than 10 nm from 28 to 90 days due to pozzolanic reaction and filling effect, whereas the LFA mainly played a filling role and a lower pozzolanic reaction during this period. Durability results showed that fly ash reduced the drying shrinkage and chloride impermeability coefficient of UHPC, and the effect of HFA was better than that of LFA.
•The effects of low-calcium fly ash (LFA) and high-calcium fly ash (HFA) on C–S–H structure, hydration products, hydration heat, and compressive strength of UHPC paste/concrete were investigated and compared.•HFA exhibited the higher band fluctuation of Si–O and Al–O and lower Ca2p-Si2p energy separation values, which indicated that more amorphous silicon oxide and alumina participated in the pozzolanic reaction.•HFA played an important role in enhancing the polymerization degree and increasing a higher level of Al-substitution for Si in C–S–H than LFA.•HFA enhanced the pore volume with diameters less than 10 nm from 28 to 90 d due to pozzolanic reaction and filling effect, whereas the LFA mainly played a filling role and a lower pozzolanic reaction during this period.</abstract><pub>Elsevier Ltd</pub><doi>10.1016/j.jclepro.2023.137735</doi></addata></record> |
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subjects | aluminum oxide calcium chlorides compression strength concrete C–S–H durability energy fly ash heat production High-calcium fly ash Low-calcium fly ash Microstructure polymerization porosity shrinkage silica thermal analysis UHPC |
title | The effects of calcium content of fly ash on hydration and microstructure of ultra-high performance concrete (UHPC) |
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