Valorization of fly ash from a thermal power plant for producing high-performance self-compacting concrete

Savić, Aleksandar; Vlahović, Milica; Martinović, Sanja; Đorđević, Nataša; Broćeta, Gordana; Volkov‐Husović, Tatjana

doi:10.2298/sos2003307s

Cited by 4 publications

(2 citation statements)

References 12 publications

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“…Also, curing conditions are effective on ultrasonic P and S wave velocities and resistivity values [31,37]. Mechanical properties of structural materials are strongly dependent on size and distribution of its pores [52,53]. Particularly in low-strength samples, the values obtained due to the high amount of pores and the water or air filling of these pores may be different.…”

Section: Preparation Of Reinforced Concrete Samplesmentioning

confidence: 99%

Anisotropy of reinforced concrete from geophysical methods

Ekin

Uyanık

2021

SCI SINTER

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Anisotropy is expressed as the direction-dependent change of material properties and it is a very important parameter to the correct determination of the concrete quality. For the aim of determining the concrete anisotropy, geophysical measurements in the study were carried out on the reinforced concrete samples with different strengths, before concrete strengths were determined from Uniaxial Compressive Strength test. Since the propagation direction of concrete pores and saturation type of it is important parameters in affecting the concrete anisotropy, prepared samples were cured as oven-dried, water-saturated, and dried in outside. Thus, the effects of curing conditions on the anisotropy of reinforced concrete were investigated by geophysical measurements. For this purpose, ultrasonic P and S wave measurements were made on two opposite surfaces of cubic samples with different reinforcement diameters. In addition, a total of 8 resistivity measurements were performed by taking two diagonal measurements on each surface in except of reinforced surfaces of the sample. The velocity and resistivity anisotropies of samples were determined by using the anisotropy relations given in the literature. As a result, it is determined that while reinforcement diameter has no distinctive effect on anisotropy, curing conditions are especially very effective on resistivity anisotropy.

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Section: Preparation Of Reinforced Concrete Samplesmentioning

confidence: 99%

Anisotropy of reinforced concrete from geophysical methods

Ekin

Uyanık

2021

SCI SINTER

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“…The disadvantages of ash-and-slag mixes are less pronounced when used in hydraulic engineering construction, where concrete class is determined at the age of 180 days. At most enterprises of the construction industry that direction was ineff ective in the preparation of concrete for public, industrial and agricultural construction, and fl y ash had no practical application [7]. The heterogeneous composition of TPP ash is one of the main disadvantages that reduce its use.…”

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confidence: 99%

Improvement of concrete and building mortar technology using secondary mineral resources

Пшинько¹,

Pavlenko²,

Dekhta³

et al. 2022

Nauk. visn. nat. hirn. univ.

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Purpose. Improving the technology of concretes on the basis of secondary mineral resources (waste foundry sand of metallurgical and machine-building industry, ash-and-slag mixes of thermal power plants). Methodology. Generally accepted standard methods in the study of the basic properties of raw materials, concrete mixes and concretes are used in the work. The samples were moulded using specially made laboratory vacuum equipment. Findings. The study results on the main properties of concretes on the basis of secondary mineral resources confirmed the effectiveness of vibrovacuum technology. For example, the strength of ash-and-slag vacuum concrete is on average higher than the strength of vibrocompacted concrete from a mobile concrete mix by 610 MPa or by 60100% (depending on the cement consumption). Also, high-quality concretes with moderate cement consumption for various types of construction are obtained on the basis of waste foundry sand. Originality. Scientific and technical bases of the technology of vibrovacuum concrete on the basis of waste foundry sand and ash-and-slag mixes were developed. Practical value. Through the development of the technology of vibrovacuum products based on secondary mineral resources concrete, high-quality concretes (increased strength, frost resistance, etc.) were obtained for road and other types of construction. This technology allows applying the existing technological equipment without fundamental design changes, carrying out immediate dismantling of moulded products, which significantly reduces the metal consumption of the technology.

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Comparison of alkali modified fly ash and alkali activated fly ash as Zn(II) ions adsorbent from aqueous solution

et al. 2022

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Fly ash which is solid waste can be used as an adsorbent for wastewater treatment. Alkali modification and alkali activation on fly ash can increase the adsorption capacity of fly ash. In this study, alkali modified fly ash and alkali activated fly ash were used as Zn(II) ions adsorbents. The effect of adsorption time and initial concentration of Zn(II) ions was studied, as well as the kinetics and isotherm adsorption. The results showed that the removal efficiency of Zn(II) ions by alkali activated fly ash is higher than that by alkali modified fly ash. The adsorptions of Zn(II) ions by alkali modified fly ash and by alkali activated fly ash have reached equilibrium after two hours. The increase of initial concentration of Zn(II) ions would decrease the removal efficiency with both alkali modified fly ash and alkali activated fly ash. Adsorptions of Zn(II) ions by both alkali modified fly ash and alkali activated fly ash tend to follow pseudo second order kinetics model and Langmuir isotherm model with maximum adsorption capacity of 62.696 mg/g and 66.667 mg/g, respectively.

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Valorization of fly ash from a thermal power plant for producing high-performance self-compacting concrete

Cited by 4 publications

References 12 publications

Anisotropy of reinforced concrete from geophysical methods

Anisotropy of reinforced concrete from geophysical methods

Improvement of concrete and building mortar technology using secondary mineral resources

Comparison of alkali modified fly ash and alkali activated fly ash as Zn(II) ions adsorbent from aqueous solution

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