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  • Küçük Resim
    Öğe
    Basic durability properties of standard mortars produced with recycled glass powder
    (Niğde Ömer Halisdemir Üniversitesi, 2019) Yücel, Hasan Erhan; Öz, Hatice Öznur; Güneş, Muhammet; Kaya, Yasin
    This research presents the basic durability properties of standard mortars (SMs) produced with recycled glass powder (RGP). In this study, six SM mixtures as well as control mixture were designed with constant water/binder (w/b) ratio of 0.48. In the mixtures, cement was replaced by RGP partially ranging from 0% to 30% by steps of 5% increment. Firstly, the slump flow diameters of SMs are determined and then the basic durability properties of SMs were observed in terms of water sorptivity, rapid chloride permeability and gas permeability. Finally, the relations between basic durability properties were determined for 7 and 28 days. According to test results, it is found that the RGP increased the workability of SMs. In addition, the highest durability performance was determined for SM incorporating 5% RGP. However, basic durability performances of SMs incorporating 10% RGP were also identified as higher than that of the control mixture. When the correlation coefficients are considered, strong relationships between durability properties are determined.
  • Küçük Resim
    Öğe
    Laboratuvar ortamında üretilen sentetik vollastonitin tasarlanmış çimento esaslı kompozitlerin mekanik özellikleri üzerine etkisi
    (Niğde Ömer Halisdemir Üniversitesi / Fen Bilimleri Enstitüsü, 2020) Kaya, Yasin; Yücel, Hasan Erhan
    Bu tez çalışmasında, sentetik vollastonitin (SV) Tasarlanmış Çimento Esaslı Kompozitlerin (ECC) mekanik özellikleri üzerine etkisi deneysel olarak incelenmiştir. İlk aşamada, SV minerallerinin üretimi sağlanmış ve en yüksek boy:çap oranına sahip iki SV tipi (SV16-SV28) belirlenmiştir. İkinci aşamada ise, belirlenen SV'ler ECC tasarımında kullanılmıştır. ECC'ler 0.27 sabit su/bağlayıcı (s/b-su/çimento (Ç)+uçucu kül (UK)+SV) oranıyla üretilmiştir. İlk olarak, ECC kontrol karışımı üretilmiş ve daha sonra SV16 sırasıyla Ç, UK ve Ç+UK yerine %3, %6, %9 ve %12 oranlarında üçüncü bir mineral katkı malzemesi olarak kullanılmıştır. Bu karışımların sonuçlarına göre, SV28 minerali Ç+UK birleşiminde, SV16 minerali ise yine aynı birleşimin Ç/UK oranı 2.2 ve kuvartz kaynağı 1000 µm olan karışımlarda %3, %6 ve %9 oranlarında kullanılmıştır. Üretilen ECC karışımlarının 7 ve 28 günlük basınç dayanımı, eğilme performansı ve kırılma tokluğu değerleri belirlenirken, elastisite modülü değeri yalnızca 28 gün için belirlenmiştir. Deney sonuçları incelendiğinde, SV16 mineralinin ECC karışımlarının mekanik özelliklerini %6 oranına kadar iyileştirdiği belirlenmiştir.
  • Küçük Resim Yok
    Öğe
    Rheological properties, strength characteristics and flexural performances of engineered cementitious composites incorporating synthetic wollastonite microfibers with two different high aspect ratios
    (Elsevier Sci Ltd, 2021) Yucel, Hasan Erhan; Oz, Hatice Oznur; Gunes, Muhammet; Kaya, Yasin
    In this study, synthetic wollastonite microfiber (SWM) with high aspect ratio (44:1/SWM-I) developed with a special technique was used in different proportions instead of cement (C), fly ash (FA) and cement + FA (C-FA) in Engineered Cementitious Composites (ECC). SWM-I decreased the workability as a result of interlocking during flow due to its acicular particle structure. When SWM-I was used instead of C, it was determined that the compressive strength decreased and the ductility improved significantly due to the increased SWM-I content. The use of SWM-I instead of FA improved the mechanical performance up to 6% in terms of compressive strength and flexural performance. However, the mixtures prepared by using SWM-I instead of C-FA provided optimum data, considering both ''increasing deformation capacity'' and ''maintaining the bearing strength by fiber bridging after crack''. Therefore, the effect of SWM-II (30:1) was tested by using instead of C-FA. SWM-I with a higher aspect ratio has been improved the mechanical properties of ECC and reduced the workability of ECC more than that of SWM-II. Increasing FA content in ECC has been provided higher ductility but decreased significantly the compressive strength. The bearing strength and deformation capacity of the ECC designed with finer aggregate has been achieved the higher levels compared to larger aggregate size. As a result of all obtained findings, the data of the optimum mixture has been determined as follows: the compressive strength, flexural strength and ductility of ECC incorporating 6% SWM-I instead of C-FA have been reached higher levels than that of 19.0%12.5%, 12.0%-8.2% and 56.2%-25.5% at 7-28 days, respectively.