Compressive strength development and durability of an environmental load-reduction material manufactured using circulating fluidized bed ash and blast-furnace slag

Zhang, Wenyan; Choi, Hyeonggil; Sagawa, Takahiro; Hama, Yukio

doi:10.1016/j.conbuildmat.2017.04.042

Cited by 35 publications

(24 citation statements)

References 38 publications

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“…These results may indicate limited possibility of FBC fly ashes use in cement materials in place of the cement, depending on their content, which is also emphasized by authors of work [1][2][3][4][5][6]9,[12][13][14] by explaining that with a large specific surface area connected with high open porosity of FBC ashes, which are the effect of conditions in which these ashes are formed.…”

Section: Porositymentioning

confidence: 63%

“…According to some researchers, the quantity of FBC fly ashes introduced into cement may reach from 15% to 30% by mass. [1][2][3][4][5][6]12].…”

Section: Introductionmentioning

confidence: 99%

“…On the other hand, due to presence of calcium sulphate in their composition, they may be used as a time controller for cement binding process [3,5,12]. In recent years a few studies have been published, where authors demonstrate that the total replacement of general purpose cement with the ash -slag binder, allows to get materials with increased durability [1][2][3][4][5][6]9,12]. According to some researchers, the quantity of FBC fly ashes introduced into cement may reach from 15% to 30% by mass.…”

Section: Introductionmentioning

confidence: 99%

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Use of fly ash from fluidized bed boilers in clinker-slag-ash based binders

Janowska-Renkas

Kowalska

2018

MATEC Web Conf.

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Abstract. The study presents the state of knowledge regarding physical and chemical properties, as well as trends for application of fly ashes from combustion in fluidized bed boilers in building materials. Clinker -slagash based binders were tested that contained up to 40 mass % of fly ashes from combustion in fluidized bed boilers. It was demonstrated that fluidized bed combustion fly ashes (FBC fly ash), apart from granular blast furnace slag, could be the ingredient of low clinker Portland cements (ca. 20% by mass). These cements, compared to CEM I Portland cement, have higher water demand and durability in the corrosive environment, and a lower compressive strength value. Based on test results of binders with various content of blast furnace slag and fly ash, the clinker -slag -ash based binder was singled out, which demonstrated the higher durability in the corrosive environment. It was found that production of clinker -slag -ash based binders was possible in the strength class 32.5 even with 30% by mass of FBC fly ash content.

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Section: Porositymentioning

confidence: 63%

“…According to some researchers, the quantity of FBC fly ashes introduced into cement may reach from 15% to 30% by mass. [1][2][3][4][5][6]12].…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Use of fly ash from fluidized bed boilers in clinker-slag-ash based binders

Janowska-Renkas

Kowalska

2018

MATEC Web Conf.

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“…Fluidized fly ash is composed of irregular porous grains (contrary to spherical vitreous grains of conventional fly ash). It contains higher amount of calcium compounds including CaSO4 (Pacewska, Blonkowski, & Wilińska, 2008;Li, Chen, Huang, Ma, & Wu, 2012;Sheng, Li, & Zhai, 2012;Xia, Yan, & Hu, 2013;Škvára et al, 2016;Zhang, Choi, Sagawa, & Hama, 2017;. Properties of this kind of fly ash do not meet PN-EN 450-1 (Polski Komitet Normalizacyjny, 2012) standard requirements for fly ash to be used in concrete.…”

Section: Introductionmentioning

confidence: 99%

“…In spite of the above mentioned difficulties, fluidized fly ash has potential as a material exhibiting self-cementing properties (Pacewska et al, 2008;Li et al, 2012;Sheng et al, 2012;Xia et al, 2013;Škvára et al, 2016;Zhang et al, 2017). Thus, it can be considered as cement replacement in low-cement concretes to improve some of their properties which are worsen in the case of using conventional Class F fly ash.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Portland cement composites containing high amounts of different kinds of fly ashes

Wilińska

Pacewska

Kubissa

2019

Modern Building Materials, Structures and Techniques (MBMST)

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Utilization of fluidized fly ash in cement composite is problematic, e.g. because of its changeable chemical composition and increased water demand of the mixture. However, this kind of by-product shows some self-cementing properties, which may be beneficial for low-cement mixtures. The article compares the impact of various kinds of fly ashes, i.e. fluidized fly ash and conventional one, and their mixtures on hydration of fly ash–cement compositions in relation to properties of final material. The amount of fly ash in the binder was 50 wt%. Calorimetry, thermal analysis (TG/DTG) and infrared spectroscopy were used. Compressive strength and water absorption of hardened composites were also registered. It was found that both fly ashes exhibit delay effect in fly ash-cement pastes which causes extension of initial setting time and lower heat released compared to the reference without fly ash. At later hydration days, fluidized fly ash develops higher pozzolanic activity than conventional one. Compositions with fluidized fly ash show better compressive strength compared to those containing conventional one. Mixing of different materials of high and low activity (fluidized and conventional fly ash in this case) seems to be a good way for creation of new cement replacement material.

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