Mucteba Uysal

Jeopolimer harçlarda dayanım, kür sıcaklığı ve boşluk oranı ilişkisinin varyans analizi ile incelenmesi

Cimento, insanoglunun son ikiyuz yildir yaygin olarak kullandigi en onemli yapi malzemelerinden birisidir. Cimentonun uretimi sirasindaki yuksek enerji ihtiyaci ve aciga cikan CO 2 gazinin atmosfere vermis oldugu zararli etki, son yillarda en cok uzerinde dusunulen konulardan birisidir. Bu sebeple cimentoya alternatif baglayici yapi malzemesi uretimi icin birtakim calismalar yapilmaktadir. Metakaolin, yuksek firin curufu ve ucucu kul gibi malzemelerin cesitli kimyasal aktivatorler ile karistirilarak aktive edilmesi sonucu cimento benzeri baglayici yapi malzemesi uretmek mumkun olabilmektedir. Bu calismada ucucu kulun, sodyum hidroksit (NaOH) ve sodyum silikat (Na 2 SiO 3 ) ile aktive edilmesi sonucu elde edilen jeopolimer harclarin cesitli yas gruplarindaki dayanimlari ile kur sicakligi ve bosluk orani iliskisinin varyans analizi arastirilmistir. Calismada Sosyal Bilimler Istatistik Programi (SPSS) kullanilmistir.

Abrasion Resistance and Strength Properties of Non-Fibrous and Steel Fiber Reinforced Mortars With Different Aggregates

In this paper, an experimental investigation was carried out to study the effect of using different aggregates on the abrasion resistance, flexural and compressive strengths of the manufactured OPC mortars. Waste foundry sand and calcareous limestone were used as a partial replacement with the standard sand. The aforementioned procedure was conducted with and without the reinforcement of steel fibers in order to inspect the significance of fibers on the intended tests. Results revealed the fact that using fiber reinforcement and waste foundry sand together proved to be in benefit of improving the characteristics of the resulted matrix. MIX 3 yielded the best results in terms of strength properties and abrasion resistance. Moreover, the mixes with limestone aggregates presented a better performance when compared to the control specimen.

Effect of Using Colemanite and Basalt Fiber on the Mechanical Properties of Metakaolin-Based Geopolymer Mortars

In the current studies which focus on the impact of CO2 emissions that released from the cement industry, showed the importance of finding alternative binders other than cement like geopolymer. This paper presented metakaolin based geopolymer which was manufactured by partially replacing metakaolin with colemanite with different percentages (10%, 20%, and 30%), to investigate the effect of colemanite on the mechanical properties of geopolymer. Then a comparison was carried out between non-fibrous specimens and basalt fiber reinforced ones to evaluate the improvement in terms of flexural and compressive strength of metakaolin-based geopolymer. The results showed that replacing metakaolin with 10% colemanite and adding 1% basalt fiber achieved 28.17% improvement in flexural strength at age 7 days compared to the reference sample.

Farklı Kompozisyonlardaki Zararlı Ortamlara Maruz Kalan Betonlar İçin Uygun Çimento Tipinin Belirlenmesi

It is emerged to use the materials optimum and efficiently due to shortage of material arising from increasing demands and developed and improved technology. Because of this, it is necessity to understand throughly and analyze the internal structure and mechanical behaviour of cement which one of the most important component of concrete. Water, carbon dioxide, oxygen, sulfate, acid and chloride infiltrate into concrete and caused various types of chemical reactions. Therefore, the concrete has exposed to some chemical and physical factors caused durability problems within the concrete. In this study, CEM I 42.5 R, CEM II/A-P 42.5 R, CEM IV/A-P 32.5 R and SDC 42.5 R types of cements were used and two types of concrete (C20/25 and C30/37) were produced and the concretes were exposed to two various hazardous chemical environments. Compressive strength test was performed on the specimens at 28 d and 180 d. However, it was aimed to determine optimum cement type of concrete exposed to various chemical hazardous environments at Ambarli Advanced Biological Wastewater Treatment Plant.