Influence of coal fly ash on the early performance enhancement and formation mechanisms of silico-aluminophosphate geopolymer
This study proposes the use of two types of coal fly-ash (CFA) (high- and low-calcium, HCFA and LCFA respectively) as additives in silico-aluminophosphate (SAP) geopolymers for early performance improvement. The chemistry of CFA in phosphate environment was clarified using CFA/orthophosphoric acid s...
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| Veröffentlicht in: | Cement and concrete research 2020-01, Vol.127, p.105932, Article 105932 |
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| creator | Wang, Yan-Shuai Alrefaei, Yazan Dai, Jian-Guo |
| description | This study proposes the use of two types of coal fly-ash (CFA) (high- and low-calcium, HCFA and LCFA respectively) as additives in silico-aluminophosphate (SAP) geopolymers for early performance improvement. The chemistry of CFA in phosphate environment was clarified using CFA/orthophosphoric acid suspensions through XRD, SEM and NMR analyses. The results revealed that HCFA could seed the active calcium sources which induced the acid-base or/and hydrolysis reaction between the alkaline calcium species within HCFAs and the acidic phosphate species in the activator. The produced calcium phosphate compounds, e.g., brushite and monetite, hurried up the setting (initial and final setting were 18 and 26 min, respectively) and early strength development (1-d and 3-d strengths increased to 15 and 29 MPa, respectively) of the HCFA-SAP geopolymer relative to CFA-free SAP geopolymer. However, the incorporation of LCFA was found to improve the workability but weakened the setting and strength properties of the LCFA-SAP geopolymers. |
| doi_str_mv | 10.1016/j.cemconres.2019.105932 |
| format | Article |
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The chemistry of CFA in phosphate environment was clarified using CFA/orthophosphoric acid suspensions through XRD, SEM and NMR analyses. The results revealed that HCFA could seed the active calcium sources which induced the acid-base or/and hydrolysis reaction between the alkaline calcium species within HCFAs and the acidic phosphate species in the activator. The produced calcium phosphate compounds, e.g., brushite and monetite, hurried up the setting (initial and final setting were 18 and 26 min, respectively) and early strength development (1-d and 3-d strengths increased to 15 and 29 MPa, respectively) of the HCFA-SAP geopolymer relative to CFA-free SAP geopolymer. However, the incorporation of LCFA was found to improve the workability but weakened the setting and strength properties of the LCFA-SAP geopolymers.</description><identifier>ISSN: 0008-8846</identifier><identifier>EISSN: 1873-3948</identifier><identifier>DOI: 10.1016/j.cemconres.2019.105932</identifier><language>eng</language><publisher>Elmsford: Elsevier Ltd</publisher><subject>Acidic activation ; Additives ; Aluminum phosphate ; Calcium compounds ; Calcium phosphates ; Coal fly ash ; Fly ash ; Geopolymer ; Geopolymers ; Microstructure ; NMR ; Nuclear magnetic resonance ; Organic chemistry ; Performance enhancement ; Phosphate activator ; Workability</subject><ispartof>Cement and concrete research, 2020-01, Vol.127, p.105932, Article 105932</ispartof><rights>2019 Elsevier Ltd</rights><rights>Copyright Elsevier BV Jan 2020</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c409t-14525dcc8929d991115f5228a4d25511d2a5fedf45a7e460063be32676d51a5b3</citedby><cites>FETCH-LOGICAL-c409t-14525dcc8929d991115f5228a4d25511d2a5fedf45a7e460063be32676d51a5b3</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://www.sciencedirect.com/science/article/pii/S0008884619308026$$EHTML$$P50$$Gelsevier$$H</linktohtml><link.rule.ids>314,776,780,3537,27901,27902,65306</link.rule.ids></links><search><creatorcontrib>Wang, Yan-Shuai</creatorcontrib><creatorcontrib>Alrefaei, Yazan</creatorcontrib><creatorcontrib>Dai, Jian-Guo</creatorcontrib><title>Influence of coal fly ash on the early performance enhancement and formation mechanisms of silico-aluminophosphate geopolymer</title><title>Cement and concrete research</title><description>This study proposes the use of two types of coal fly-ash (CFA) (high- and low-calcium, HCFA and LCFA respectively) as additives in silico-aluminophosphate (SAP) geopolymers for early performance improvement. The chemistry of CFA in phosphate environment was clarified using CFA/orthophosphoric acid suspensions through XRD, SEM and NMR analyses. The results revealed that HCFA could seed the active calcium sources which induced the acid-base or/and hydrolysis reaction between the alkaline calcium species within HCFAs and the acidic phosphate species in the activator. The produced calcium phosphate compounds, e.g., brushite and monetite, hurried up the setting (initial and final setting were 18 and 26 min, respectively) and early strength development (1-d and 3-d strengths increased to 15 and 29 MPa, respectively) of the HCFA-SAP geopolymer relative to CFA-free SAP geopolymer. However, the incorporation of LCFA was found to improve the workability but weakened the setting and strength properties of the LCFA-SAP geopolymers.</description><subject>Acidic activation</subject><subject>Additives</subject><subject>Aluminum phosphate</subject><subject>Calcium compounds</subject><subject>Calcium phosphates</subject><subject>Coal fly ash</subject><subject>Fly ash</subject><subject>Geopolymer</subject><subject>Geopolymers</subject><subject>Microstructure</subject><subject>NMR</subject><subject>Nuclear magnetic resonance</subject><subject>Organic chemistry</subject><subject>Performance enhancement</subject><subject>Phosphate activator</subject><subject>Workability</subject><issn>0008-8846</issn><issn>1873-3948</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2020</creationdate><recordtype>article</recordtype><recordid>eNqFkE9LxDAQxYMouK5-BgOeuyZp06bHRfwHC170HLLJxGZpk5p0hT343U1d8eppmHlv3jA_hK4pWVFC69vdSsOgg4-QVozQNk95W7ITtKCiKYuyrcQpWhBCRCFEVZ-ji5R2ua1ZKRbo69nbfg9eAw4W66B6bPsDVqnDweOpAwwq5sEI0YY4qNkIvpvrAH7Cyhv8I0wu-wfQWXJpSHNacr3ToVD9fnA-jF1IY6cmwO8QxtAfBoiX6MyqPsHVb12it4f717unYvPy-Hy33hS6Iu1U0IozbrQWLWtN21JKueWMCVUZxjmlhiluwdiKqwaqOv9WbqFkdVMbThXflkt0c8wdY_jYQ5rkLuyjzyclK1mTcwUn2dUcXTqGlCJYOUY3qHiQlMiZtdzJP9ZyZi2PrPPm-rgJ-YlPB1Em7WaoxkXQkzTB_ZvxDZPzji4</recordid><startdate>202001</startdate><enddate>202001</enddate><creator>Wang, Yan-Shuai</creator><creator>Alrefaei, Yazan</creator><creator>Dai, Jian-Guo</creator><general>Elsevier Ltd</general><general>Elsevier BV</general><scope>AAYXX</scope><scope>CITATION</scope><scope>7QQ</scope><scope>7SR</scope><scope>8BQ</scope><scope>8FD</scope><scope>FR3</scope><scope>JG9</scope><scope>KR7</scope></search><sort><creationdate>202001</creationdate><title>Influence of coal fly ash on the early performance enhancement and formation mechanisms of silico-aluminophosphate geopolymer</title><author>Wang, Yan-Shuai ; Alrefaei, Yazan ; Dai, Jian-Guo</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c409t-14525dcc8929d991115f5228a4d25511d2a5fedf45a7e460063be32676d51a5b3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2020</creationdate><topic>Acidic activation</topic><topic>Additives</topic><topic>Aluminum phosphate</topic><topic>Calcium compounds</topic><topic>Calcium phosphates</topic><topic>Coal fly ash</topic><topic>Fly ash</topic><topic>Geopolymer</topic><topic>Geopolymers</topic><topic>Microstructure</topic><topic>NMR</topic><topic>Nuclear magnetic resonance</topic><topic>Organic chemistry</topic><topic>Performance enhancement</topic><topic>Phosphate activator</topic><topic>Workability</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Wang, Yan-Shuai</creatorcontrib><creatorcontrib>Alrefaei, Yazan</creatorcontrib><creatorcontrib>Dai, Jian-Guo</creatorcontrib><collection>CrossRef</collection><collection>Ceramic Abstracts</collection><collection>Engineered Materials Abstracts</collection><collection>METADEX</collection><collection>Technology Research Database</collection><collection>Engineering Research Database</collection><collection>Materials Research Database</collection><collection>Civil Engineering Abstracts</collection><jtitle>Cement and concrete research</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Wang, Yan-Shuai</au><au>Alrefaei, Yazan</au><au>Dai, Jian-Guo</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Influence of coal fly ash on the early performance enhancement and formation mechanisms of silico-aluminophosphate geopolymer</atitle><jtitle>Cement and concrete research</jtitle><date>2020-01</date><risdate>2020</risdate><volume>127</volume><spage>105932</spage><pages>105932-</pages><artnum>105932</artnum><issn>0008-8846</issn><eissn>1873-3948</eissn><abstract>This study proposes the use of two types of coal fly-ash (CFA) (high- and low-calcium, HCFA and LCFA respectively) as additives in silico-aluminophosphate (SAP) geopolymers for early performance improvement. The chemistry of CFA in phosphate environment was clarified using CFA/orthophosphoric acid suspensions through XRD, SEM and NMR analyses. The results revealed that HCFA could seed the active calcium sources which induced the acid-base or/and hydrolysis reaction between the alkaline calcium species within HCFAs and the acidic phosphate species in the activator. The produced calcium phosphate compounds, e.g., brushite and monetite, hurried up the setting (initial and final setting were 18 and 26 min, respectively) and early strength development (1-d and 3-d strengths increased to 15 and 29 MPa, respectively) of the HCFA-SAP geopolymer relative to CFA-free SAP geopolymer. However, the incorporation of LCFA was found to improve the workability but weakened the setting and strength properties of the LCFA-SAP geopolymers.</abstract><cop>Elmsford</cop><pub>Elsevier Ltd</pub><doi>10.1016/j.cemconres.2019.105932</doi></addata></record> |
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| ispartof | Cement and concrete research, 2020-01, Vol.127, p.105932, Article 105932 |
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| language | eng |
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| source | Elsevier ScienceDirect Journals |
| subjects | Acidic activation Additives Aluminum phosphate Calcium compounds Calcium phosphates Coal fly ash Fly ash Geopolymer Geopolymers Microstructure NMR Nuclear magnetic resonance Organic chemistry Performance enhancement Phosphate activator Workability |
| title | Influence of coal fly ash on the early performance enhancement and formation mechanisms of silico-aluminophosphate geopolymer |
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