Characteristics of CFBC fly ash and properties of cement-based composites with CFBC fly ash and coal-fired fly ash

Wu, Tehsien; Chi, Maochieh; Huang, Ran

doi:10.1016/j.conbuildmat.2014.05.057

Cited by 78 publications

(33 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Thus, adding CFBFA to replace OPC reduced the compressive strength. These results are in agreement with Wu et al, in which CFBFA was used to partially replace cement in producing cement-based composites [17].…”

Section: Compressive Strength Development Of Cfbfabc Pastessupporting

confidence: 83%

Elucidating the Pozzolanic Characteristics of Pastes Containing Circulating Fluidized Bed Fly Ash

Lin¹,

Hwang²,

Chang³

2015

TOCIEJ

View full text Add to dashboard Cite

Abstract:The aim of this study is to investigate the pozzolanic characteristics of circulating fluidized bed fly ash blended cement (CFBFABC) paste containing circulating fluidized bed fly ash (CFBFA). The initial and final setting time of CFBFABC pastes with CFBFA retards with an increasing CFBFA content. CFBFABC pastes containing 10% CFBFA exhibited a compressive strength similar to that of ordinary Portland cement pastes at the ages of 90 days. X-ray diffraction peaks indicated the presence of portlandite, ettringite, and unreacted C 3 S (32.6°) and C 2 S (41.9°). The gel/space ratio of the CFBFABC pastes increased with the curing time and decreased as the CFBFA content increased. The gel/space ratio increased with the curing time because of the progress of hydration, which led to some of the pores being filled. At the ages of 90 days, the gel/space ratio of the CFBFABC pastes containing 10% CFBFA increased to approximately 14%, it is possibly the consumption of Ca(OH) 2 and the formation of C-S-H in the CFBFABC pastes. The CFBFABC pastes containing 10% CFBFA did not exhibit any major decrease in the gel/space ratio. It exhibited favorable mechanical characteristics that were observed when the mixing ratio of CFBFA was 10%. Furthermore, CFBFA has the potential, as a pozzolanic material, partially to replace ordinary Portland cement.

show abstract

Section: Compressive Strength Development Of Cfbfabc Pastessupporting

confidence: 83%

Elucidating the Pozzolanic Characteristics of Pastes Containing Circulating Fluidized Bed Fly Ash

Lin¹,

Hwang²,

Chang³

2015

TOCIEJ

View full text Add to dashboard Cite

show abstract

“…Compressive strength development increased at later ages in the CFBFABCP samples than in the ordinary Portland cement pastes, particularly at higher concentrations of CFB fly ash. The decrease in compressive strength resulted from the reduction of the cement content of the mixture and excessive production of Ca(OH) 2 from the reaction of free lime with water, which is unfavorable to the mechanical properties of cement [11,12]. …”

Section: Tests Carried Outmentioning

confidence: 99%

“…Previous investigations have indicated that the compressive strength of mortar comprising various combinations of coal-fired fly ash and CFB fly ash is lower than that of mortar containing Portland cement. However, coal-fired fly ash can effectively mitigate strength reduction [8].…”

Section: Introductionmentioning

confidence: 99%

Utilization of Circulating Fluidized Bed Fly Ash as Pozzolanic Material

Lin¹,

Cheng²,

Ho³

et al. 2017

TOCIEJ

View full text Add to dashboard Cite

A circulating fluidized bed (CFB) boiler generates energy by burning petroleum coke. Because burnt petroleum coke has a high sulfur content, limestone is added to the boiler to reduce the emittance of sulfur dioxide through desulfuration. The residue collected from the boiler is called CFB ash. CFB boilers in Taiwan can produce 328,000 tonnes of CFB fly ash per year. In this study, the pozzolanic characteristics of CFB fly ash were investigated by blending CFB fly ash and ordinary Portland cement (OPC). The CFB fly ash was mainly composed of CaO, SO 3 , and SiO 2 in concentrations of 37.8%, 9.2%, and 2.2%, respectively. The crystals of CFB fly ash contained 3CaO.SiO 2 , 2CaO.SiO 2 , Ca(OH) 2 , C-S-H (Tobermolite), and Ettringite. The results revealed that applying the toxicity characteristic leaching procedure to CFB fly ash renders it suitable for use in blended cement. At later curing ages (90 days), the pore volumes of both the OPC and the CFB-fly-ash-blended cement pastes (CFBFABCP) decreased as the curing time increased. A possible explanation is that C 3 S and C 2 S were consumed to form C-S-H gel, resulting in an increase in the Q 1 and Q 2 groups identified by 29 Si Nuclear Magnetic Resonance (NMR) spectroscopy. Furthermore, the peak of the Q group decreased, but those of the Q 1 and Q 2 peaks increased with an increasing curing time. The pozzolanic activity of the CFBFABCP containing 10% CFB fly ash indicates that it is a suitable substitute for OPC in blended cement.

show abstract

“…Lime, cement and bitumen are commonly used additives for stabilization of expansive soils [1][2][3]. Recently, different additive materials such as fly ash, rice husk ash, silica fume, ladle furnace slag and geo fibers are used to improve some geotechnical properties of poor soils [4][5][6][7][8][9][10]. Besides these additives, industrial wastes such as olive oil wastes [11] and basalt fibers [12] are also used for remediation of soils.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Marble Dust for Soil Stabilization

Yilmaz

Yurdakul

2017

Acta Phys. Pol. A

View full text Add to dashboard Cite

Usage of marble dust was investigated for soil stabilization in the scope of utilization of waste material. Geotechnical properties, such as compaction, Atterberg limits, unconfined compressive strength of the mixtures and changes of these properties with the marble dust ratio were determined. From the test results it is seen that marble dust increases the mechanical properties of soil and application of dust wastes for soil stabilization will be an efficient practice in terms of solid waste management.

show abstract

Characteristics of CFBC fly ash and properties of cement-based composites with CFBC fly ash and coal-fired fly ash

Cited by 78 publications

References 19 publications

Elucidating the Pozzolanic Characteristics of Pastes Containing Circulating Fluidized Bed Fly Ash

Elucidating the Pozzolanic Characteristics of Pastes Containing Circulating Fluidized Bed Fly Ash

Utilization of Circulating Fluidized Bed Fly Ash as Pozzolanic Material

Evaluation of Marble Dust for Soil Stabilization

Contact Info

Product

Resources

About