Investigation of the fly ash - β cyclodextrin composite on concrete’s durability indexes
- Ikotun, Bolanle D., Fanourakis, George C., Mishra, Shivani B.
- Authors: Ikotun, Bolanle D. , Fanourakis, George C. , Mishra, Shivani B.
- Date: 2018
- Subjects: Composite , Cyclodextrin , Fly ash
- Language: English
- Type: Conference proceedings
- Identifier: http://hdl.handle.net/10210/279959 , uj:30076 , Citation: Ikotun, B.D., Fanourakis, G.C. & Mishra, S.B. 2018. Investigation of the fly ash - β cyclodextrin composite on concrete’s durability indexes.
- Description: Abstract: Concrete quality can be assessed by its ability to withstand its design life without failing, which is a function of its strength and durability. The effect of fly ash (FA)-β- cyclodextrin (β-CD) composite on concrete’s durability indexes was investigated in this paper. Two durability index tests (oxygen permeability and sorptivity) were used for the assessment. FA (30% and 50% by mass of cement), β-CD (0.025%, 0.05% and 0.1%) and FA-β-CD composite were incorporated in the concrete mix. Twenty four different concrete mixes were investigated at 0.5 water-binder ratio (W/B) and 0.4 W/B. The tests were performed on the concrete samples after being cured for 28 and 90 days. The results showed that β-CD and FA-β-CD composite decrease oxygen permeability and sorptivity of concrete when used at optimum percentages.
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- Authors: Ikotun, Bolanle D. , Fanourakis, George C. , Mishra, Shivani B.
- Date: 2018
- Subjects: Composite , Cyclodextrin , Fly ash
- Language: English
- Type: Conference proceedings
- Identifier: http://hdl.handle.net/10210/279959 , uj:30076 , Citation: Ikotun, B.D., Fanourakis, G.C. & Mishra, S.B. 2018. Investigation of the fly ash - β cyclodextrin composite on concrete’s durability indexes.
- Description: Abstract: Concrete quality can be assessed by its ability to withstand its design life without failing, which is a function of its strength and durability. The effect of fly ash (FA)-β- cyclodextrin (β-CD) composite on concrete’s durability indexes was investigated in this paper. Two durability index tests (oxygen permeability and sorptivity) were used for the assessment. FA (30% and 50% by mass of cement), β-CD (0.025%, 0.05% and 0.1%) and FA-β-CD composite were incorporated in the concrete mix. Twenty four different concrete mixes were investigated at 0.5 water-binder ratio (W/B) and 0.4 W/B. The tests were performed on the concrete samples after being cured for 28 and 90 days. The results showed that β-CD and FA-β-CD composite decrease oxygen permeability and sorptivity of concrete when used at optimum percentages.
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Modification of the hydration products of hydrated cement paste by fly ash, β-cyclodextrin and fly ash-β-cyclodextrin composite
- Ikotun, B. D., Mishra S., Fanourakis, George C.
- Authors: Ikotun, B. D. , Mishra S. , Fanourakis, George C.
- Date: 2017
- Subjects: Fly ash , Cyclodextrin , XRD
- Language: English
- Type: Article
- Identifier: http://ujcontent.uj.ac.za8080/10210/385555 , http://hdl.handle.net/10210/241647 , uj:24907 , Citation: Ikotun, B.D., Mishra S. & Fanourakis, G.C. 2017. Modification of the hydration products of hydrated cement paste by fly ash, β-cyclodextrin and fly ash-β-cyclodextrin composite.
- Description: Abstract: Studies on the modification of the hydration products of fly ash (FA), β-cyclodextrin (β-CD) and fly ash-β-cyclodextrin (FA-β-CD) composite cement paste samples as hydration progressed were done using X-ray diffraction analysis, scanning electron microscopy and Fourier transform infrared spectroscopy. This paper investigates the effect of FA, β-CD and FA-β-CD composite on the hydration and pozzolanic reactions. It was evident from all the analyses that β-CD improved the hydration reaction from the 7 day hydration period, while improvement on pozzolanic reaction was revealed from the 28 day hydration period. The study contributed to the knowledge of FA performance as a composite with cyclodextrin and promoted the continued inclusion of FA in concrete.
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- Authors: Ikotun, B. D. , Mishra S. , Fanourakis, George C.
- Date: 2017
- Subjects: Fly ash , Cyclodextrin , XRD
- Language: English
- Type: Article
- Identifier: http://ujcontent.uj.ac.za8080/10210/385555 , http://hdl.handle.net/10210/241647 , uj:24907 , Citation: Ikotun, B.D., Mishra S. & Fanourakis, G.C. 2017. Modification of the hydration products of hydrated cement paste by fly ash, β-cyclodextrin and fly ash-β-cyclodextrin composite.
- Description: Abstract: Studies on the modification of the hydration products of fly ash (FA), β-cyclodextrin (β-CD) and fly ash-β-cyclodextrin (FA-β-CD) composite cement paste samples as hydration progressed were done using X-ray diffraction analysis, scanning electron microscopy and Fourier transform infrared spectroscopy. This paper investigates the effect of FA, β-CD and FA-β-CD composite on the hydration and pozzolanic reactions. It was evident from all the analyses that β-CD improved the hydration reaction from the 7 day hydration period, while improvement on pozzolanic reaction was revealed from the 28 day hydration period. The study contributed to the knowledge of FA performance as a composite with cyclodextrin and promoted the continued inclusion of FA in concrete.
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The effect of Fly ash, Beta-cyclodextrin and Fly ash-Beta-cyclodextrin composites on cement paste’s viscosity and setting times
- Ikotun, Bolanle D., Fanourakis, George C., Mishra, Shivani B.
- Authors: Ikotun, Bolanle D. , Fanourakis, George C. , Mishra, Shivani B.
- Date: 2016
- Subjects: Cement paste , Fly ash , Cyclodextrin , Concrete - Mechanical properties
- Language: English
- Type: Conference proceedings
- Identifier: http://hdl.handle.net/10210/218027 , uj:21719 , Citation: Ikotun, B.D., Fanourakis, G.C. & Mishra, S.B. 2016. The effect of Fly ash, Beta-cyclodextrin and Fly ash-Beta-cyclodextrin composites on cement paste’s viscosity and setting times.
- Description: Abstract: The possibility of increasing the usage of Fly ash (FA) in concrete has been a subject of interest and investigation by the authors. In the previous work, a composite of Fly ash- β- cyclodextrin (FA-β-CD) has been seen to have the tendencies of improving hydration reaction. To have further insight on how this composite can affect the mechanical properties of concrete, its rheological properties (viscosity and setting time) are assessed in this article. FA was used in percentages of 30 and 50, while β-CD was used in 0.025, 0.05 and 0.1 percentages. These percentages were based on the total percentage of cement (by mass). The results showed that increased in FA and β-CD contents, reduced the viscosity of the cement paste. Also, higher contents of FA and β-CD, reduced the water required for consistency and extended the setting times.
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- Authors: Ikotun, Bolanle D. , Fanourakis, George C. , Mishra, Shivani B.
- Date: 2016
- Subjects: Cement paste , Fly ash , Cyclodextrin , Concrete - Mechanical properties
- Language: English
- Type: Conference proceedings
- Identifier: http://hdl.handle.net/10210/218027 , uj:21719 , Citation: Ikotun, B.D., Fanourakis, G.C. & Mishra, S.B. 2016. The effect of Fly ash, Beta-cyclodextrin and Fly ash-Beta-cyclodextrin composites on cement paste’s viscosity and setting times.
- Description: Abstract: The possibility of increasing the usage of Fly ash (FA) in concrete has been a subject of interest and investigation by the authors. In the previous work, a composite of Fly ash- β- cyclodextrin (FA-β-CD) has been seen to have the tendencies of improving hydration reaction. To have further insight on how this composite can affect the mechanical properties of concrete, its rheological properties (viscosity and setting time) are assessed in this article. FA was used in percentages of 30 and 50, while β-CD was used in 0.025, 0.05 and 0.1 percentages. These percentages were based on the total percentage of cement (by mass). The results showed that increased in FA and β-CD contents, reduced the viscosity of the cement paste. Also, higher contents of FA and β-CD, reduced the water required for consistency and extended the setting times.
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The effect of fly ash, β-cyclodextrin and fly ash-β-cyclodextrin composites on concrete workability and strength
- Ikotun, B. D., Fanourakis, George C., Mishra, Bhardwaj S.
- Authors: Ikotun, B. D. , Fanourakis, George C. , Mishra, Bhardwaj S.
- Date: 2017
- Subjects: Composite , Compressive strength , Cyclodextrin
- Language: English
- Type: Article
- Identifier: http://hdl.handle.net/10210/241655 , uj:24908 , Citation: Ikotun, B.D., Fanourakis, G.C. & Mishra, B.S. 2017. The effect of fly ash, β-cyclodextrin and fly ash-β-cyclodextrin composites on concrete workability and strength.
- Description: Abstract: To increase the use of fly ash (FA) as a pozzolanic material in concrete, a composite was formed with an interaction of FA with β-cyclodextrin (β-CD). Further research was carried out in this article to study the effects of replacing cement with FA (30% and 50% by mass), β-CD (0.025%, 0.05% and 0.1%) and FA-β-CD composite on the workability and strength of concrete. Workability was assessed by means of the slump test and strengths were assessed using the compressive and split tensile strength tests. Higher combined contents of FA and β- CD resulted in increased workability of concrete of up to approximately 550 %. Furthermore, the inclusion of β-CD generally increased both the compressive and tensile strengths of the concretes not containing FA by up to 10 %. When combined with FA, the β-CD resulted in increased compressive strengths of up to 63 % and tensile strengths of up to 28 %, compared to the relevant pozzolanic concretes which did not include β-CD. The study contributed to the knowledge of FA performance using cyclodextrin and promoted the continued inclusion of FA in concrete, which in turn should reduce the environmental pollution resulting from FA.
- Full Text:
- Authors: Ikotun, B. D. , Fanourakis, George C. , Mishra, Bhardwaj S.
- Date: 2017
- Subjects: Composite , Compressive strength , Cyclodextrin
- Language: English
- Type: Article
- Identifier: http://hdl.handle.net/10210/241655 , uj:24908 , Citation: Ikotun, B.D., Fanourakis, G.C. & Mishra, B.S. 2017. The effect of fly ash, β-cyclodextrin and fly ash-β-cyclodextrin composites on concrete workability and strength.
- Description: Abstract: To increase the use of fly ash (FA) as a pozzolanic material in concrete, a composite was formed with an interaction of FA with β-cyclodextrin (β-CD). Further research was carried out in this article to study the effects of replacing cement with FA (30% and 50% by mass), β-CD (0.025%, 0.05% and 0.1%) and FA-β-CD composite on the workability and strength of concrete. Workability was assessed by means of the slump test and strengths were assessed using the compressive and split tensile strength tests. Higher combined contents of FA and β- CD resulted in increased workability of concrete of up to approximately 550 %. Furthermore, the inclusion of β-CD generally increased both the compressive and tensile strengths of the concretes not containing FA by up to 10 %. When combined with FA, the β-CD resulted in increased compressive strengths of up to 63 % and tensile strengths of up to 28 %, compared to the relevant pozzolanic concretes which did not include β-CD. The study contributed to the knowledge of FA performance using cyclodextrin and promoted the continued inclusion of FA in concrete, which in turn should reduce the environmental pollution resulting from FA.
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