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.
- Full Text:
- 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.
- Full Text:
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.
- Full Text:
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