Effect of production temperature on thermal and mechanical properties of polystyrene–fly ash composites

BİÇER, Ayşe

doi:10.1177/2633366x20917988

Cited by 23 publications

(13 citation statements)

References 34 publications

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“…Definitely the least favourable effect of modification was achieved for the 15% FA concrete. Although this substitute was characterized by fine granulation and high reactivity (Figures 8, 9) with a larger amount of this additive, the effect of reducing the strength of the composite, which was characteristic for FA, during the period below 90 days of curing became visible [95,118]. Moreover, it was observed that the results When analysing the results obtained for both f cm and f ctm , it should be stated that the highest indices of strength, both compressive and tensile, had concrete with a quaternary binder, containing a smaller proportion of FA, i.e., 5%.…”

Section: Mechanical Parametersmentioning

confidence: 99%

Energy Savings Associated with the Use of Fly Ash and Nanoadditives in the Cement Composition

Golewski

2020

Energies

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The paper presented herein investigates the effects of using supplementary cementitious materials (SCMs) in quaternary mixtures on the compressive strength and splitting tensile strength of plain concrete. In addition, environmental benefits resulting from the proposed solutions were analysed. A total of four concrete mixtures were designed, having a constant water/binder ratio of 0.4 and total binder content of 352 kg/m3. The control mixture only contained ordinary Portland cement (OPC) as binder, whereas others incorporated quaternary mixtures of: OPC, fly ash (FA), silica fume (SF), and nanosilica (nS). Based on the obtained test results, it was found that concretes made on quaternary binders containing nanoadditives have very favorable mechanical parameters. The quaternary concrete containing: 80% OPC, 5% FA, 10% SF, and 5% nS have shown the best results in terms of good compressive strength and splitting tensile strength, whereas the worst mechanical parameters were characterized by concrete with more content of FA additive in the concrete mix, i.e., 15%. Moreover, the results of compressive strength and splitting tensile strength are qualitatively convergent. Furthermore, reducing the amount of OPC in the composition of the concrete mix in quaternary concretes causes environmental benefits associated with the reduction of: raw materials that are required for burning clinker, electricity, and heat energy in the production of cement.

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Section: Mechanical Parametersmentioning

confidence: 99%

Energy Savings Associated with the Use of Fly Ash and Nanoadditives in the Cement Composition

Golewski

2020

Energies

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“…Researchers have searched for alternatives to glass fibers from both natural (e.g., wood flour, rice husks) (La Mantia and Morreale, 2006;Tong et al, 2014;Chen et al, 2018) and man-made sources (e.g., fly ash from coal production). Previous studies have explored the integration of fly ash into various polymers such as polypropylene (PP), polyethylene terephthalate (PET), polystyrene (PS), and high density polyethylene (HDPE) (Rebeiz et al, 1995;Satapathy and Kothapalli, 2015;Yao et al, 2019;Bicer, 2020;Ajorloo et al, 2021). Many of the results have demonstrated promise.…”

Section: Introductionmentioning

confidence: 99%

“…Many of the results have demonstrated promise. For example, fly ash was determined to disperse well throughout a polymer matrix, leading to uniform mechanical properties (Bicer, 2020;Ajorloo et al, 2021). Additionally, one study reported that when blended with PET, ash filler could improve tensile strength without causing changes to the glass transition temperature or thermal degradation (Rebeiz et al, 1995).…”

Section: Introductionmentioning

confidence: 99%

Sustainable Composites Using Landfill Bound Materials

et al. 2022

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The demand for new methods of diverting materials from waste streams has grown as sustainability and landfill reduction goals continue to be set. Municipal solid waste combustion and waste-to-energy (WTE) facilities reduce landfill waste accumulation but ash material by-products are commonly sent to landfills. In this work, we evaluate the potential for fly ash to be used as an inert filler in post-consumer recycled polyethylene to maximize landfill diversion of high-volume materials. Using fly ash from solid waste combustion as a filler increases landfill diversion, reduces associated costs, and offsets the cost of the recycling for post-consumer plastics by blending with a low cost filler. Characterization of the fly ash revealed high variability in ash particle composition and size, which was expected due to the municipal solid waste source. A series of composites were compounded incorporating fly ash into recycled linear low-density polyethylene utilizing various compatibilizers. The composites were characterized for molecular interactions, thermal properties, mechanical properties and changes in melt processing via infrared spectroscopy, differential scanning calorimetry, electromechanical testing, and oscillatory melt rheology, respectively. Mechanical testing of the fly ash composites indicated that the fly ash did not significantly change the Young’s modulus or yield stress and the addition of various compatibilizer additives increased impact strength. The impact strength of the neat polymer decreased drastically from ∼55 kJ/m2 to ∼20 kJ/m2 at 5 wt. % fly ash. However, the addition of PGME compatibilizer at 0.75 wt. % increased the composite’s impact strength to roughly the same value as the neat polymer. Thus, the addition of a compatibilizer could be used to alter the fly ash filler composite’s resistance to flexural shock. These results indicate that fly ash can be added to recycled linear low-density polyethylene up to 10% while maintaining physical properties.

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“…In accordance with the principles of sustainable construction, attempts should be made to minimize the use of ordinary Portland cement (OPC) for the production of concrete by replacing it with other materials. Such actions, which are undoubtedly pro-ecological, directly affect: reduction of greenhouse gas emissions (GHG) to the atmosphere, such as CO 2 , NO, NO 2 [ 1 , 2 , 3 ]; reduction of heat and electricity consumption [ 4 , 5 , 6 ]; reduction of the extraction of natural resources [ 7 , 8 , 9 ]; possibility to utilize industrial wastes, such as fly ash (FA) or silica fume (SF) [ 10 , 11 , 12 ]. …”

Section: Introductionmentioning

confidence: 99%

Studies of Fracture Toughness in Concretes Containing Fly Ash and Silica Fume in the First 28 Days of Curing

Golewski

Gil

2021

Materials

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This paper presents the results of the fracture toughness of concretes containing two mineral additives. During the tests, the method of loading the specimens according to Mode I fracture was used. The research included an evaluation of mechanical parameters of concrete containing noncondensed silica fume (SF) in an amount of 10% and siliceous fly ash (FA) in the following amounts: 0%, 10% and 20%. The experiments were carried out on mature specimens, i.e., after 28 days of curing and specimens at an early age, i.e., after 3 and 7 days of curing. In the course of experiments, the effect of adding SF to the value of the critical stress intensity factor—KIcS in FA concretes in different periods of curing were evaluated. In addition, the basic strength parameters of concrete composites, i.e., compressive strength—fcm and splitting tensile strength—fctm, were measured. A novelty in the presented research is the evaluation of the fracture toughness of concretes with two mineral additives, assessed at an early age. During the tests, the structures of all composites and the nature of macroscopic crack propagation were also assessed. A modern and useful digital image correlation (DIC) technique was used to assess macroscopic cracks. Based on the conducted research, it was found the application of SF to FA concretes contributes to a significant increase in the fracture toughness of these materials at an early age. Moreover, on the basis of the obtained test results, it was found that the values of the critical stress intensity factor of analyzed concretes were convergent qualitatively with their strength parameters. It also has been demonstrated that in the first 28 days of concrete curing, the preferred solution is to replace cement with SF in the amount of 10% or to use a cement binder substitution with a combination of additives in proportions 10% SF + 10% FA. On the other hand, the composition of mineral additives in proportions 10% SF + 20% FA has a negative effect on the fracture mechanics parameters of concretes at an early age. Based on the analysis of the results of microstructural tests and the evaluation of the propagation of macroscopic cracks, it was established that along with the substitution of the cement binder with the combination of mineral additives, the composition of the cement matrix in these composites changes, which implies a different, i.e., quasi-plastic, behavior in the process of damage and destruction of the material.

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Effect of production temperature on thermal and mechanical properties of polystyrene–fly ash composites

Cited by 23 publications

References 34 publications

Energy Savings Associated with the Use of Fly Ash and Nanoadditives in the Cement Composition

Energy Savings Associated with the Use of Fly Ash and Nanoadditives in the Cement Composition

Sustainable Composites Using Landfill Bound Materials

Studies of Fracture Toughness in Concretes Containing Fly Ash and Silica Fume in the First 28 Days of Curing

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