Performance of cement mortars and concretes containing coal bottom ash: A comprehensive review

Coal fly ash (CFA), coal bottom ash (CBA) are residues produced in thermo-electrical power stations as result of the coal combustion in the same boiler. Therefore, some characteristics of the coal fly ash (CFA) are comparable with those of the coal bottom ash (CBA). Nevertheless, coal bottom ash size is larger than coal fly ash one. Consequently, it was found that it is necessary to grind the coal bottom ash (CBA) to reach a similar size to that one of the CFA. The objective of this paper is to evaluate the performance of Portland cement mortars made with coal fly ash (CFA), coal bottom ash (CBA) or mixes (CFA+CBA), against sulphate attack. The methodology is based on the expansion of slender bars submerged in a sodium sulphate solution (5%) according to the ASTM C-1012/C1012-13 standard. It has been found that mortars elaborated with CEM I 42.5 N (without ashes) presented the largest expansion (0.09%) after a testing period of 330 days. Mortars made with CEM II/A-V exhibited lower expansion (0.03%). Summing up, it can be established that mortar expansion decreases when the coal ash amount increases, independently of the type of coal ash employed. The novelty of this paper relies on the comparison between the performances of Portland cement mortars made with coal fly ash (CFA) or coal bottom ash (CBA) exposed to external sulphate attack. Doi: 10.28991/cej-2021-03091640 Full Text: PDF

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PERFORMANCE ON COAL BOTTOM ASH IN HOT MIX ASPHALT

International Journal of Research in Engineering and Technology ◽

10.15623/ijret.2013.0208004 ◽

2013 ◽

Vol 02 (08) ◽

pp. 24-33 ◽

Cited By ~ 4

Author(s):

Gunalaan Vasudevan .

Keyword(s):

Hot Mix Asphalt ◽

Bottom Ash ◽

Coal Bottom Ash

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Reactivity of Ground Coal Bottom Ash to Be Used in Portland Cement

J ◽

10.3390/j4030018 ◽

2021 ◽

Vol 4 (3) ◽

pp. 223-232

Author(s):

Esperanza Menéndez ◽

Cristina Argiz ◽

Miguel Ángel Sanjuán

Keyword(s):

Fly Ash ◽

Coal Fly Ash ◽

Bottom Ash ◽

Blended Cement ◽

Coal Ash ◽

Pozzolanic Reaction ◽

Natural Sand ◽

Coal Bottom Ash ◽

Novel Material ◽

Pozzolanic Properties

Ground coal bottom ash is considered a novel material when used in common cement production as a blended cement. This new application must be evaluated by means of the study of its pozzolanic properties. Coal bottom ash, in some countries, is being used as a replacement for natural sand, but in some others, it is disposed of in a landfill, leading thus to environmental problems. The pozzolanic properties of ground coal bottom ash and coal fly ash cements were investigated in order to assess their pozzolanic performance. Proportions of coal fly ash and ground coal bottom ash in the mixes were 100:0, 90:10, 80:20, 50:50, 0:100. Next, multicomponent cements were formulated using 10%, 25% or 35% of ashes. In general, the pozzolanic performance of the ground coal bottom ash is quite similar to that of the coal fly ash. As expected, the pozzolanic reaction of both of them proceeds slowly at early ages, but the reaction rate increases over time. Ground coal bottom ash is a promising novel material with pozzolanic properties which are comparable to that of coal fly ashes. Then, coal bottom ash subjected to an adequate mechanical grinding is suitable to be used to produce common coal-ash cements.

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A Review of the Utilization of Coal Bottom Ash (CBA) in the Construction Industry

Sustainability ◽

10.3390/su13148031 ◽

2021 ◽

Vol 13 (14) ◽

pp. 8031

Author(s):

Syakirah Afiza Mohammed ◽

Suhana Koting ◽

Herda Yati Binti Katman ◽

Ali Mohammed Babalghaith ◽

Muhamad Fazly Abdul Patah ◽

...

Keyword(s):

Human Health ◽

Construction Industry ◽

Bottom Ash ◽

High Volume ◽

Coal Bottom Ash ◽

Substitute Material ◽

Physical And Chemical ◽

Vast Range

One effective method to minimize the increasing cost in the construction industry is by using coal bottom ash waste as a substitute material. The high volume of coal bottom ash waste generated each year and the improper disposal methods have raised a grave pollution concern because of the harmful impact of the waste on the environment and human health. Recycling coal bottom ash is an effective way to reduce the problems associated with its disposal. This paper reviews the current physical and chemical and utilization of coal bottom ash as a substitute material in the construction industry. The main objective of this review is to highlight the potential of recycling bottom ash in the field of civil construction. This review encourages and promotes effective recycling of coal bottom ash and identifies the vast range of coal bottom ash applications in the construction industry.

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