Sürdürülebilir Kalkınma Amaçları

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Yazarlar

• Dirikolu, İ.(1)
• Erbayrak, Engin(1)
• Gökçe, H.S.(1)
• Ozer, Halil(1)
• Tekin, İ.(1)

• MakaleYalnız künye2021Scopus SJRQ1/r/bayburt/12156
  A regional supplementary cementitious material for the cement industry: Pistachio shell ash

  Tekin, İ.; Dirikolu, İ.; Gökçe, H.S.

  The recycling of agricultural wastes in cementitious products has recently been a trendy approach for the sustainability goals of the world as it ensures economic and ecological advantages in addition to the safe disposal of these wastes. In this regard, the potentiality of a biomass ash obtained from the incineration of pistachio shell to serve as a supplementary cementitious material is documented in the present study. An increase of up to 30% in the amount of pistachio shell ash resulted in the proportional increase of both water requirement and setting time of the ordinary Portland cement by up to 54% and 300%, respectively. The incorporation of up to 20% pistachio shell ash into the cement yielded specimens of comparable or higher compressive strength values relatively varying between 98% and 117% at the 28 days and later curing ages. Beside the cementitious property, it was observed that a presence of graphitic structures in the pistachio shell ash remarkably improved the mechanical and the microstructural properties of cement mortars. In conclusion, at least 10% incorporation of this ash into the cement is highly recommended for the cement industry as it is beneficial in achieving the highest ultimate (400-day) compressive strength and promotes no loss on the early (2-day) compressive strength.

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  AtıfScopus41·WoS38·OpenAlex45

  İncele
• MakaleAçık Erişim2020Scopus SJRQ3/r/bayburt/14152
  Effect of loading rate on cohesive parameters of the adhesive Araldite 2015

  Erbayrak, Engin; Ozer, Halil

  This study addresses the effect of loading rates on cohesive parameters and microstructural composition of the Araldite 2015 adhesive. Double Cantilever Beam (DCB) samples were tested under the loading rates of 1, 5, 10, 20, 100 and 200 mm x min(-1). The Park-Paulinho-Roeser model (PPR model) was used to get cohesive parameters. In modelling of the softening behavior, inverse analyses were performed using the date obtained from the PPR softening curves. It was seen that the fracture energy and cohesive parameters are decreasing with increasing the loading rate. However, there seems to be a transition region where the fracture energy nearly remains constant. Microstructural analyses were implemented in order to study the effects of the loading rates on the characteristics of the fracture surfaces. It was concluded that the loading rates greatly influence the distribution of micro-voids in the epoxy matrix. Moreover, the presence of voids in epoxy matrix improved the plastic deformation around the crack tip and increased the fracture toughness.

  AtıfWoS3

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