Effects of high-temperature fly ash and fluidized bed combustion ash on the hydration of Portland cement

Šiler, Pavel; Bayer, Patrik; Sehnal, Tomáš; Kolářová, Iva; Opravil, Tomáš; Šoukal, František

doi:10.1016/j.conbuildmat.2015.01.032

Cited by 30 publications

(23 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Particle size of FBCFA also varies, but it is usually slightly coarser compared with traditional PCC fly ash: around 20-30 µm (see Supplementary Materials). The smallest reported particle size is 1.63 µm for filter fly ash [42], and highest for paper sludge fly ash: 140 µm [30]. Avearge median particle size (d50) of FBCFA for arcticles reviewed here is 28.5 µm (totally 46 articles have reported the particle size).…”

Section: Particle Size Of Fbc Fly Ashesmentioning

confidence: 76%

“…FBCFA has been found to have pozzolanic reactivity and hence the potential to partially replace OPC [38,[91][92][93][94][95][96][97][98]. Typically, the initial setting time of mortars increases while the compressive strength decreases with an increasing amount of cement replacement by FBCFA; even Šiler et al [42] found that the pastes containing FBCFA show higher strength, faster hydration, and a higher temperature in the first hours of hydration. Sinsiri et al [99] found that the porosity and air permeability of FBCFA pastes are higher than those of PCC fly ash pastes.…”

Section: Partial Replacement Of Cement In Concretementioning

confidence: 99%

See 1 more Smart Citation

Utilization of Fly Ashes from Fluidized Bed Combustion: A Review

et al. 2020

View full text Add to dashboard Cite

Traditionally fly ash is thought to be glassy, spherical particle originating from pulverized coal combustion (PCC) at temperature up to 1700 °C. However, nowadays fluidized bed combustion (FBC) technology is spreading quickly around the world as it is an efficient and environmentally friendly method. FBC is also able to utilize mixtures of low-grade solid fuels (e.g., coal, lignite, biomass, and waste) that have fluctuating quality, composition, and moisture contents. However, this leads to a high variation in the produced fly ash quality, unlike PCC fly ash, and hence challenges when attempting to utilize this fly ash. In this study, the utilization of fluidized bed combustion fly ash (FBCFA) was reviewed using the Scopus database. The most promising utilization target for FBCFA from biomass combustion is as a fertilizer and soil amendment. In construction, the FBCFA from various fuels is utilized as cement replacement material, in non-cement binders, as lightweight aggregates and cast-concrete products. Other types of construction applications include mine backfilling material, soil stabilizer, and road construction material. There are also other promising applications for FBCFA utilization, such as catalysts support material and utilization in waste stabilization.

show abstract

Section: Particle Size Of Fbc Fly Ashesmentioning

confidence: 76%

Section: Partial Replacement Of Cement In Concretementioning

confidence: 99%

Utilization of Fly Ashes from Fluidized Bed Combustion: A Review

et al. 2020

View full text Add to dashboard Cite

show abstract

“…In addition to prevent disposal, using fly ash as a cement replacement material means a significant reduction in CO 2 emissions related to industrial cement production from traditional raw materials (limestone and clay), and the preservation of natural resources can also be achieved. There are many promising studies that have investigated the use of FBC fly ash as a cement replacement material [3][4][5][6][7][8][9][10][11][12][13]. However, the use of FBC or biomass fly ashes as a partial cement replacement material is not allowed by the American standard ASTM 618 [14] or the European standard EN 450-1 [15], which are the standards governing the use of fly ashes as mineral admixtures in concrete.…”

Section: Introductionmentioning

confidence: 99%

Mechanically Treated Fly Ash from Fluidized Bed Combustion of Peat, Wood, and Wastes in Concrete

Ohenoja

Wigren²,

Österbacka

et al. 2019

Waste Biomass Valor

View full text Add to dashboard Cite

Fly ash generation in fluidized bed combustion (FBC) is a critical issue in many countries due to its disposal is becoming increasingly restricted and expensive. Because of this, there is a demand for applications in which these types of fly ashes could be utilized efficiently. One promising use for FBC fly ashes is as a cement replacement material in mortar and concrete. The current concrete regulations do not allow the use FBC fly ash as a supplementary cementitious material, but it can be expected to be included in the standards in the future. The properties of FBC fly ashes typically do not fulfill the values set in the standards as such. This study aimed to establish whether the properties of fly ashes from FBC of peat, wood, and wastes can be modified by mechanical classification and grinding so that they meet the requirements of the standards. The sulfate and chloride content, the sum of the main components (Si, Al, Fe), and the fineness of material were analyzed before and after the classification and grinding processes. In addition, the mortar specimens were prepared by using the processed fly ash as a cement replacement material. It was found that air jet classification is an effective fractionating method for fly ashes that effectively removes sulfate and chloride into fine fraction. Classified and ground fly ashes are potential alternative cement replacement materials. It is possible to achieve 80% of the control sample's compressive strength and 90% of the control sample's flexural strength for mortars containing 20% of classified and ground FBC fly ashes. Graphical AbstractLow utilization potential fly ash Fine fraction: 10 -30% fly ash~ Hazardous components: heavy metals, SO 4 , Cl Coarse fraction: 70 -90% fly ash C hemical composition fulfills EN 450-1 concrete standard Waste disposal stabilization Grinding High value product, e.g. for concrete air air Air jet classificationThis study aimed to establish whether the utilization potential of fly ashes from FBC of peat, wood, and wastes can be improved in concrete by mechanical classification and grinding, which is not done earlier. We found that it is possible to modify these fly ashes to fulfill concrete standards. Usually it is thought that fly ashes from fluidized bed combustion are not suitable for standardized concrete, but this study shows that with treatments it is possible.

show abstract

“…Calcium hydroxide was form by the hydration process of almost 28 wt% of ordinary Portland cement. In the end, hydrated calcium silicates are formed from the reaction between calcium hydroxide in water and amorphous SiO 2 in a pozzolanic materials [23].…”

Section: Pozzolanic Materialsmentioning

confidence: 99%

Potential Mixture of POFA and SCBA as Cement Replacement in Concrete – A Review

et al. 2017

View full text Add to dashboard Cite

Concrete is an important material used in all kind of building construction and ordinary Portland cement (OPC) is one of an important element in the production of concrete. However, the production of cement causes a problem because of high CO 2 emission to atmosphere. The manufacture of 1 tonnes of cement would produce approximately released 1 tonnes of CO 2. So, the need to search another material that can replace a cement with same properties and environmental friendly are crucial. The suitable material to replace cement has to be a pozzolanic materials. This is because pozzolanic materials has cementitious properties and high silica content. Palm oil fuel ash (POFA) and sugarcane bagasse ash (SCBA) are the material that suitable to replace cement because of high silica content. The use of POFA and SCBA in concrete has been studied by many researcher and it has been proved to improve the mechanical strength of the concrete either in normal concrete, high strength concrete or lightweight concrete. This paper would discuss the overview of the previous study on the cement replacement by POFA and SCBA and the potential of the both materials to be mix together to improve its properties. The chemical element which will be the focus point is SiO 4 , MgO, CaO and SO 3 , while the physical and mechanical properties such as workability, specific gravity, compressive strength and tensile strength will also be reviewed.

show abstract

Effects of high-temperature fly ash and fluidized bed combustion ash on the hydration of Portland cement

Cited by 30 publications

References 27 publications

Utilization of Fly Ashes from Fluidized Bed Combustion: A Review

Utilization of Fly Ashes from Fluidized Bed Combustion: A Review

Mechanically Treated Fly Ash from Fluidized Bed Combustion of Peat, Wood, and Wastes in Concrete

Potential Mixture of POFA and SCBA as Cement Replacement in Concrete – A Review

Contact Info

Product

Resources

About