Observations on the rheological response of alkali activated fly ash suspensions: the role of activator type and concentration
This paper reports the influence of activator type and concentration on the rheological properties of alkali-activated fly ash suspensions. A thorough investigation of the rheological influences (yield stress and plastic viscosity) of several activator parameters, including: (i) the cation type and...
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| Veröffentlicht in: | Rheologica acta 2014-11, Vol.53 (10-11), p.843-855 |
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| creator | Vance, Kirk Dakhane, Akash Sant, Gaurav Neithalath, Narayanan |
| description | This paper reports the influence of activator type and concentration on the rheological properties of alkali-activated fly ash suspensions. A thorough investigation of the rheological influences (yield stress and plastic viscosity) of several activator parameters, including: (i) the cation type and concentration of alkali hydroxide and (ii) the alkali-to-binder ratio (
n
) and silica modulus (M
s
), and (iii) the volume of the activation solution, on the suspension rheology is presented. The results indicate a strong dependence on the cation and its concentration in the activation solution. The viscosity of the activation solution and the volumetric solution-to-powder ratio are shown to most strongly influence the plastic viscosity of the suspension. The suspension yield stress is predominantly influenced by the changes in fly ash particle surface charge and the ionic species in the activator. A shift from non-Newtonian to Newtonian flow behavior is noted in the case of silicate-based suspensions for M
s
≤ 1.5. This behavior, which is not observed at higher M
S
values, or when the fly ash is dispersed in hydroxide solutions or pure water, is hypothesized to be caused by colloidal siliceous species present in this system, or surface charge effects on the fly ash particles. Comparisons of the rheological response of alkali-activated suspensions to that of portland cement-water suspensions are also reported. |
| doi_str_mv | 10.1007/s00397-014-0793-z |
| format | Article |
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n
) and silica modulus (M
s
), and (iii) the volume of the activation solution, on the suspension rheology is presented. The results indicate a strong dependence on the cation and its concentration in the activation solution. The viscosity of the activation solution and the volumetric solution-to-powder ratio are shown to most strongly influence the plastic viscosity of the suspension. The suspension yield stress is predominantly influenced by the changes in fly ash particle surface charge and the ionic species in the activator. A shift from non-Newtonian to Newtonian flow behavior is noted in the case of silicate-based suspensions for M
s
≤ 1.5. This behavior, which is not observed at higher M
S
values, or when the fly ash is dispersed in hydroxide solutions or pure water, is hypothesized to be caused by colloidal siliceous species present in this system, or surface charge effects on the fly ash particles. Comparisons of the rheological response of alkali-activated suspensions to that of portland cement-water suspensions are also reported.</description><identifier>ISSN: 0035-4511</identifier><identifier>EISSN: 1435-1528</identifier><identifier>DOI: 10.1007/s00397-014-0793-z</identifier><language>eng</language><publisher>Berlin/Heidelberg: Springer Berlin Heidelberg</publisher><subject>Activation ; Cations ; Characterization and Evaluation of Materials ; Chemistry and Materials Science ; Complex Fluids and Microfluidics ; Dependence ; Fly ash ; Food Science ; Materials Science ; Mechanical Engineering ; Original Contribution ; Polymer Sciences ; Portland cements ; Rheological properties ; Rheology ; Silicon dioxide ; Soft and Granular Matter ; Surface charge ; Viscosity ; Yield strength ; Yield stress</subject><ispartof>Rheologica acta, 2014-11, Vol.53 (10-11), p.843-855</ispartof><rights>Springer-Verlag Berlin Heidelberg 2014</rights><rights>Rheologica Acta is a copyright of Springer, (2014). All Rights Reserved.</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c493t-6cdeb7d293d045f34797aac012df76c02062062e3cd8a5299efb11b89efb394e3</citedby><cites>FETCH-LOGICAL-c493t-6cdeb7d293d045f34797aac012df76c02062062e3cd8a5299efb11b89efb394e3</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://link.springer.com/content/pdf/10.1007/s00397-014-0793-z$$EPDF$$P50$$Gspringer$$H</linktopdf><linktohtml>$$Uhttps://link.springer.com/10.1007/s00397-014-0793-z$$EHTML$$P50$$Gspringer$$H</linktohtml><link.rule.ids>314,780,784,27924,27925,41488,42557,51319</link.rule.ids></links><search><creatorcontrib>Vance, Kirk</creatorcontrib><creatorcontrib>Dakhane, Akash</creatorcontrib><creatorcontrib>Sant, Gaurav</creatorcontrib><creatorcontrib>Neithalath, Narayanan</creatorcontrib><title>Observations on the rheological response of alkali activated fly ash suspensions: the role of activator type and concentration</title><title>Rheologica acta</title><addtitle>Rheol Acta</addtitle><description>This paper reports the influence of activator type and concentration on the rheological properties of alkali-activated fly ash suspensions. A thorough investigation of the rheological influences (yield stress and plastic viscosity) of several activator parameters, including: (i) the cation type and concentration of alkali hydroxide and (ii) the alkali-to-binder ratio (
n
) and silica modulus (M
s
), and (iii) the volume of the activation solution, on the suspension rheology is presented. The results indicate a strong dependence on the cation and its concentration in the activation solution. The viscosity of the activation solution and the volumetric solution-to-powder ratio are shown to most strongly influence the plastic viscosity of the suspension. The suspension yield stress is predominantly influenced by the changes in fly ash particle surface charge and the ionic species in the activator. A shift from non-Newtonian to Newtonian flow behavior is noted in the case of silicate-based suspensions for M
s
≤ 1.5. This behavior, which is not observed at higher M
S
values, or when the fly ash is dispersed in hydroxide solutions or pure water, is hypothesized to be caused by colloidal siliceous species present in this system, or surface charge effects on the fly ash particles. Comparisons of the rheological response of alkali-activated suspensions to that of portland cement-water suspensions are also reported.</description><subject>Activation</subject><subject>Cations</subject><subject>Characterization and Evaluation of Materials</subject><subject>Chemistry and Materials Science</subject><subject>Complex Fluids and Microfluidics</subject><subject>Dependence</subject><subject>Fly ash</subject><subject>Food Science</subject><subject>Materials Science</subject><subject>Mechanical Engineering</subject><subject>Original Contribution</subject><subject>Polymer Sciences</subject><subject>Portland cements</subject><subject>Rheological properties</subject><subject>Rheology</subject><subject>Silicon dioxide</subject><subject>Soft and Granular Matter</subject><subject>Surface charge</subject><subject>Viscosity</subject><subject>Yield strength</subject><subject>Yield stress</subject><issn>0035-4511</issn><issn>1435-1528</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2014</creationdate><recordtype>article</recordtype><sourceid>AFKRA</sourceid><sourceid>BENPR</sourceid><sourceid>CCPQU</sourceid><sourceid>DWQXO</sourceid><recordid>eNp1kEtLxDAUhYMoOI7-AHcB19E82qZxJ4MvGJiNrkOa3s50rElNOsLMwt9uagVXwoWzuOc7Bw5Cl4xeM0rlTaRUKEkoywiVSpDDEZqxTOSE5bw8RrP0zkmWM3aKzmLcUspkIfkMfa2qCOHTDK13EXuHhw3gsAHf-XVrTYcDxD69APsGm-7NdC02dmgTATVuuj02cYPjLvbg4phxOyX4biImqw942PeAjaux9c6CG8JP5Tk6aUwX4eJX5-j14f5l8USWq8fnxd2S2EyJgRS2hkrWXImaZnkjMqmkMZYyXjeysJTTYjwQti5NzpWCpmKsKkcVKgMxR1dTbh_8xw7ioLd-F1yq1JwnloqiZMnFJpcNPsYAje5D-27CXjOqx5n1NLNOM-txZn1IDJ-YmLxuDeEv-X_oGxrMgzk</recordid><startdate>20141101</startdate><enddate>20141101</enddate><creator>Vance, Kirk</creator><creator>Dakhane, Akash</creator><creator>Sant, Gaurav</creator><creator>Neithalath, Narayanan</creator><general>Springer Berlin Heidelberg</general><general>Springer Nature B.V</general><scope>AAYXX</scope><scope>CITATION</scope><scope>8FE</scope><scope>8FG</scope><scope>ABJCF</scope><scope>AFKRA</scope><scope>BENPR</scope><scope>BGLVJ</scope><scope>CCPQU</scope><scope>D1I</scope><scope>DWQXO</scope><scope>HCIFZ</scope><scope>KB.</scope><scope>L6V</scope><scope>M7S</scope><scope>PDBOC</scope><scope>PQEST</scope><scope>PQQKQ</scope><scope>PQUKI</scope><scope>PTHSS</scope></search><sort><creationdate>20141101</creationdate><title>Observations on the rheological response of alkali activated fly ash suspensions: the role of activator type and concentration</title><author>Vance, Kirk ; Dakhane, Akash ; Sant, Gaurav ; Neithalath, Narayanan</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c493t-6cdeb7d293d045f34797aac012df76c02062062e3cd8a5299efb11b89efb394e3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2014</creationdate><topic>Activation</topic><topic>Cations</topic><topic>Characterization and Evaluation of Materials</topic><topic>Chemistry and Materials Science</topic><topic>Complex Fluids and Microfluidics</topic><topic>Dependence</topic><topic>Fly ash</topic><topic>Food Science</topic><topic>Materials Science</topic><topic>Mechanical Engineering</topic><topic>Original Contribution</topic><topic>Polymer Sciences</topic><topic>Portland cements</topic><topic>Rheological properties</topic><topic>Rheology</topic><topic>Silicon dioxide</topic><topic>Soft and Granular Matter</topic><topic>Surface charge</topic><topic>Viscosity</topic><topic>Yield strength</topic><topic>Yield stress</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Vance, Kirk</creatorcontrib><creatorcontrib>Dakhane, Akash</creatorcontrib><creatorcontrib>Sant, Gaurav</creatorcontrib><creatorcontrib>Neithalath, Narayanan</creatorcontrib><collection>CrossRef</collection><collection>ProQuest SciTech Collection</collection><collection>ProQuest Technology Collection</collection><collection>Materials Science & Engineering Collection</collection><collection>ProQuest Central UK/Ireland</collection><collection>ProQuest Central</collection><collection>Technology Collection</collection><collection>ProQuest One Community College</collection><collection>ProQuest Materials Science Collection</collection><collection>ProQuest Central Korea</collection><collection>SciTech Premium Collection</collection><collection>Materials Science Database</collection><collection>ProQuest Engineering Collection</collection><collection>Engineering Database</collection><collection>Materials Science Collection</collection><collection>ProQuest One Academic Eastern Edition (DO NOT USE)</collection><collection>ProQuest One Academic</collection><collection>ProQuest One Academic UKI Edition</collection><collection>Engineering Collection</collection><jtitle>Rheologica acta</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Vance, Kirk</au><au>Dakhane, Akash</au><au>Sant, Gaurav</au><au>Neithalath, Narayanan</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Observations on the rheological response of alkali activated fly ash suspensions: the role of activator type and concentration</atitle><jtitle>Rheologica acta</jtitle><stitle>Rheol Acta</stitle><date>2014-11-01</date><risdate>2014</risdate><volume>53</volume><issue>10-11</issue><spage>843</spage><epage>855</epage><pages>843-855</pages><issn>0035-4511</issn><eissn>1435-1528</eissn><abstract>This paper reports the influence of activator type and concentration on the rheological properties of alkali-activated fly ash suspensions. A thorough investigation of the rheological influences (yield stress and plastic viscosity) of several activator parameters, including: (i) the cation type and concentration of alkali hydroxide and (ii) the alkali-to-binder ratio (
n
) and silica modulus (M
s
), and (iii) the volume of the activation solution, on the suspension rheology is presented. The results indicate a strong dependence on the cation and its concentration in the activation solution. The viscosity of the activation solution and the volumetric solution-to-powder ratio are shown to most strongly influence the plastic viscosity of the suspension. The suspension yield stress is predominantly influenced by the changes in fly ash particle surface charge and the ionic species in the activator. A shift from non-Newtonian to Newtonian flow behavior is noted in the case of silicate-based suspensions for M
s
≤ 1.5. This behavior, which is not observed at higher M
S
values, or when the fly ash is dispersed in hydroxide solutions or pure water, is hypothesized to be caused by colloidal siliceous species present in this system, or surface charge effects on the fly ash particles. Comparisons of the rheological response of alkali-activated suspensions to that of portland cement-water suspensions are also reported.</abstract><cop>Berlin/Heidelberg</cop><pub>Springer Berlin Heidelberg</pub><doi>10.1007/s00397-014-0793-z</doi><tpages>13</tpages></addata></record> |
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| subjects | Activation Cations Characterization and Evaluation of Materials Chemistry and Materials Science Complex Fluids and Microfluidics Dependence Fly ash Food Science Materials Science Mechanical Engineering Original Contribution Polymer Sciences Portland cements Rheological properties Rheology Silicon dioxide Soft and Granular Matter Surface charge Viscosity Yield strength Yield stress |
| title | Observations on the rheological response of alkali activated fly ash suspensions: the role of activator type and concentration |
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