Effect of fineness and dosage of fly ash on selected properties of mortars

Sirivivatnanon, V; Moghaddam, F; Vessalas, K

Effect of fineness and dosage of fly ash on selected properties of mortars

Sirivivatnanon, V

Moghaddam, F Vessalas, K

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Publisher:: Concrete Institute of Australia
Publication Type:: Conference Proceeding
Citation:: 2019
Issue Date:: 2019-09-08

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Field	Value	Language
dc.contributor.author	Sirivivatnanon, V https://orcid.org/0000-0003-1901-6064	en_US
dc.contributor.author	Moghaddam, F	en_US
dc.contributor.author	Vessalas, K https://orcid.org/0000-0003-3948-5212	en_US
dc.date	2019-09-08	en_US
dc.date.available	2019-05-30	en_US
dc.date.issued	2019-09-08	en_US
dc.identifier.citation	2019	en_US
dc.identifier.uri	http://hdl.handle.net/10453/138136
dc.description.abstract	In this paper, a laboratory investigation was carried out to evaluate the effect of fineness and levels of fly ash on the selected fresh, hardened and durability properties of mortars such as flow, compressive strength, drying shrinkage, strength activity index and alkali-silica reactivity. Portland cement was partially replaced by 20%, 30% and 40% of three kinds of fly ashes with different fineness (classified, run-of-station and ground run-of-station fly ashes). Fixed water to binder ratio of 0.40 and sand to binder ratio of 2.5 with a fixed dosage of water reducer were maintained for these mixes. In addition, some mixes containing classified and run-of-station fly ash with 50%, 60% and 70% cement replacement with fixed water to binder ratio of 0.55 and sand to binder ratio of 5 with a fixed dosage of water reducer were cast to evaluate the effect of fineness of fly ash in low strength mortar. Moreover, the effectiveness and required level of classified and run-of-station fly ash on mitigating alkali-silica reactivity are evaluated using accelerated mortar bar test method, and the results are reported in this paper. The results showed that all kinds of fly ashes improved the flowability of the mix with superior performance for the finer fly ash. X-ray diffraction and compressive strength test results demonstrated the effect of fineness of fly ash in decreasing the crystalline phase, increasing reactivity and improving the strength development. Drying shrinkage was decreased considerably with the inclusion of all kinds of fly ashes at all replacement levels. Incorporation of 25% classified and run-of-station fly ash is needed to control the expansion of mortar bars due to alkali-silica reactivity by the reducing the alkalinity of the mix.	en_US
dc.publisher	Concrete Institute of Australia	en_US
dc.relation.ispartof	29th Biennial National Conference of the Concrete Institute of Australia,	en_US
dc.title	Effect of fineness and dosage of fly ash on selected properties of mortars	en_US
dc.type	Conference Proceeding
utslib.location.activity	Sydney, Australia	en_US
pubs.embargo.period	Not known	en_US
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology/School of Civil and Environmental Engineering
pubs.organisational-group	/University of Technology Sydney/Strength - CBI - Centre for Built Infrastructure
utslib.copyright.status	closed_access
pubs.consider-herdc	false	en_US
pubs.finish-date	2019-09-11	en_US
pubs.start-date	2019-09-08	en_US

Abstract:

In this paper, a laboratory investigation was carried out to evaluate the effect of fineness and levels of fly ash on the selected fresh, hardened and durability properties of mortars such as flow, compressive strength, drying shrinkage, strength activity index and alkali-silica reactivity. Portland cement was partially replaced by 20%, 30% and 40% of three kinds of fly ashes with different fineness (classified, run-of-station and ground run-of-station fly ashes). Fixed water to binder ratio of 0.40 and sand to binder ratio of 2.5 with a fixed dosage of water reducer were maintained for these mixes. In addition, some mixes containing classified and run-of-station fly ash with 50%, 60% and 70% cement replacement with fixed water to binder ratio of 0.55 and sand to binder ratio of 5 with a fixed dosage of water reducer were cast to evaluate the effect of fineness of fly ash in low strength mortar. Moreover, the effectiveness and required level of classified and run-of-station fly ash on mitigating alkali-silica reactivity are evaluated using accelerated mortar bar test method, and the results are reported in this paper. The results showed that all kinds of fly ashes improved the flowability of the mix with superior performance for the finer fly ash. X-ray diffraction and compressive strength test results demonstrated the effect of fineness of fly ash in decreasing the crystalline phase, increasing reactivity and improving the strength development. Drying shrinkage was decreased considerably with the inclusion of all kinds of fly ashes at all replacement levels. Incorporation of 25% classified and run-of-station fly ash is needed to control the expansion of mortar bars due to alkali-silica reactivity by the reducing the alkalinity of the mix.

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http://hdl.handle.net/10453/138136