Ternary binder made of CFBC fly ash, conventional fly ash, and calcium hydroxide: Phase and strength evolution

Hlaváček, Petr; Šulc, Rostislav; Šmilauer, Vít; Rößler, Christiane; Snop, Roman

doi:10.1016/j.cemconcomp.2017.09.020

Cited by 39 publications

(16 citation statements)

References 25 publications

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“…They found that the mortar samples that incorporated 20% FBCFA and 30% rice husk ash exhibited the highest compressive strength values, and all of the samples exhibited good durability and high resistance to sulfate attacks. One more studied ternary binder was consisted of FBCFA, conventional fly ash and Ca(OH) 2 activator, and this paste yielded a compressive strength of 32 MPa after 28 days of standard sealed curing [114]. However, high free-CaO content of FBCFA may led to decreased compressive strength.…”

Section: Mixtures Of Industrial Waste Materialsmentioning

confidence: 99%

Utilization of Fly Ashes from Fluidized Bed Combustion: A Review

et al. 2020

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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.

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Section: Mixtures Of Industrial Waste Materialsmentioning

confidence: 99%

Utilization of Fly Ashes from Fluidized Bed Combustion: A Review

et al. 2020

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“…In Figure 7 , a slight reduction in tensile strength of samples containing 10, 15 and 20% SSW was observed. The decreased rate in tensile strength at an early age can be due to the creation of weak C–S–H [ 31 , 32 ]. Moreover, as can be seen from Figure 7 , the replacement of SSW powder with cement increased the tensile strength at later ages.…”

Section: Resultsmentioning

confidence: 99%

“…Unreacted partials, C-H, and C-S-H formation were also observed in the control samples. The available spaces in the cement paste, the heat of hydration process, and the amount of impurities of the cement affect the hexagonal crystals formed in the C-H [ 31 ]. The role of C-H is restricted because of low Van der Waals forces affecting concrete strength.…”

Section: Resultsmentioning

confidence: 99%

The Effect of Incorporating Silica Stone Waste on the Mechanical Properties of Sustainable Concretes

et al. 2020

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Incorporating various industrial waste materials into concrete has recently gained attention for sustainable construction. This paper, for the first time, studies the effects of silica stone waste (SSW) powder on concrete. The cement of concrete was replaced with 5, 10, 15, and 20% of the SSW powder. The mechanical properties of concrete, such as compressive and tensile strength, were studied. Furthermore, the microstructure of concrete was studied by scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy analysis (EDX), Fourier transformed infrared spectroscopy (FTIR), and X-Ray diffraction (XRD) tests. Compressive and tensile strength of samples with 5% SSW powder was improved up to 18.8% and 10.46%, respectively. As can be observed in the SEM images, a reduced number of pores and higher density in the matrix can explain the better compressive strength of samples with 5% SSW powder.

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“…In [25], sodium sulphate was used as a binding activator, whereas in [26], a paste with FA was activated with sodium hydroxide. In [27], calcium hydroxide made up 9.4% of the paste mass as an activator for a paste with FA. The amount of calcium used in our study ranged from 0.31% to 0.92% and from 0.46% to 1.31% of the composites' mass, respectively (the remaining part, made up of lime, came from the hydration of alite and belite in cement).…”

Section: Introductionmentioning

confidence: 99%

Old Dumped Fly Ash as a Sand Replacement in Cement Composites

Harasymiuk

Rudziński

2020

Buildings

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The use of industrial residues to replace natural resources for the production of building materials is economically and ecologically justified. Fly ash (FA) taken directly from electro-filters is commonly used as a cement replacement material. This is not the case, however, for old dumped fly ash (ODFA) that has been accumulating in on-site waste dumps for decades and currently has no practical use. It causes environmental degradation, which is not fully controlled by the governments of developed countries. The aim of the study was to assess the possibility of using ODFA as a partial replacement for sand in cement composites. ODFA replaced part of the sand mass (20% and 30%) in composites with a limited amount of cement (a cement-saving measure) and sand (saving non-renewable raw material resources). ODFA was activated by the addition of different proportions of hydrated lime, the purposes of which was to trigger a pozzolanic reaction in ODFA. The quantitative composition of the samples was chosen in such a way as to ensure the maximum durability and longevity of composites with a limited amount of cement. The 28-day samples were exposed to seawater attack for 120 days. After this period, the compressive strength of each sample series was determined. The results suggest the possibility of using ODFA with hydrated lime to lay town district road foundations and bike paths of 3.5 to 5 MPA compressive strength. What is more, these composites can be used in very aggressive environments.

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Ternary binder made of CFBC fly ash, conventional fly ash, and calcium hydroxide: Phase and strength evolution

Cited by 39 publications

References 25 publications

Utilization of Fly Ashes from Fluidized Bed Combustion: A Review

Utilization of Fly Ashes from Fluidized Bed Combustion: A Review

The Effect of Incorporating Silica Stone Waste on the Mechanical Properties of Sustainable Concretes

Old Dumped Fly Ash as a Sand Replacement in Cement Composites

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