Yazar "Dayi, Mustafa" seçeneğine göre listele

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  • Küçük Resim
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    Çimento Hamur ve Harçlarında Kireç Kullanımının İncelenmesi
    (2021) Aruntaş, Hüseyin Yılmaz; Şahinöz, Melih; Dayi, Mustafa
    Bu çalışmada, çimento esaslı harç karışımlarına farklı oranda sönmüş kireç katılarak elde edilen hamur ve harç karışımlarının bazıfiziksel ve mekanik özellikleri incelenmiştir. Hamur ve harç karışımlarında CEM I çimentosu, sönmüş kireç, CEN standart kumuve şehir şebeke suyu kullanılmıştır. CEM I çimentosuna, sönmüş kireç ağırlıkça %0, %20, %40, %60 ve %80 oranlarında ikameedilerek hamur ve harç karışımları hazırlanmıştır. Bütün hamur ve harç karışımlarında işlenebilirlik sabit tutulmuştur. Hamurkarışımlar üzerinde standart kıvam suyu, priz başı ve priz sonu ile genleşme tayini deneyleri yapılmıştır. Hazırlanan harçlar ile40x40x160 mm boyutlu numuneler üretilmiştir. Sertleşmiş harç numuneleri üzerinde birim ağırlık ile 7, 28 ve 90 gün yaşlarındaeğilmede çekme ve basınç dayanımı deneyleri yapılmıştır. Sonuç olarak; hamur karışımına giren sönmüş kireç oranındaki artışın,kıvam suyu miktarını arttırdığı, priz başı süresini göreceli olarak azaltırken priz sonu süresini uzattığı ve genleşmeyi azalttığıbelirlenmiştir. Diğer taraftan sönmüş kireç miktarındaki artışın; harçların birim ağırlık, eğilmede çekme dayanımı ile basınçdayanımını azalttığı tespit edilmiştir.
  • Küçük Resim Yok
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    The Investigation of Combined Effect of GBFS and Slaked Lime on Cement Paste and Mortar Properties
    (Gazi Univ, 2023) Aruntas, Huseyin Yilmaz; Sahinoz, Melih; Dayi, Mustafa
    In this experimental study, some physical and mechanical properties of the specimens produced by using a high ratio of slaked lime (SL) and ground blast-furnace slag (GBFS) in cement-based paste and mortar mixtures were investigated. Mixtures of pastes and mortars were prepared by replacing SK and GBFS with Portland cement at 10% SL+10% GBFS, 20% SL+20% GBFS, and 30% SL+30% GBFS ratios by weight. The workability of the produced mortar mixtures was kept fixed. The physical and mechanical experimental results obtained from the produced mortar mixtures were compared among themselves and with the control specimens. Consistency water, setting times, and volume expansion experiments were performed on paste specimens, and unit volume weight, compressive strength, and flexural strength experiments were performed on mortar specimens. Obtained experiment results showed that substituting SL and GBFS together with cement increased the amount of paste consistency water, decreased initial setting times, but increased final setting times, and decreased the unit volume weight and volume expansion. In addition, up to 30% replacement of SL and GBFS together reduced the 7, 28, and 90 days flexural and compressive strengths of the specimens.
  • Küçük Resim Yok
    Öğe
    Mechanical, durability and microstructural characteristics of Portland pozzolan cement (PPC) produced with high volume pumice: Green, cleaner and sustainable cement development
    (Elsevier Sci Ltd, 2023) Ulusu, Hayati; Aruntas, Hueseyin Yilmaz; Gultekin, Arzuhan Burcu; Dayi, Mustafa; Cavus, Murat; Kaplan, Gokhan
    Nowadays, it is frequently preferred to use pozzolans instead of clinker to reduce the CO2 emissions that increase with cement production. Because in the future, the release of artificial pozzolans, such as fly ash and blast furnace slag, will decrease. Therefore, the demand for natural pozzolanic cement will increase. This study aimed to produce Portland Pozzolan Cement (PPC) by using pumice instead of clinker up to 40%. The Chemical, physical, mechanical, durability, microstructure, and carbon footprint characteristics of PPCs were investigated experimentally. As the pumice volume in the PPCs increased, the CaO/SiO2 ratio and specific gravity decreased. Due to the hygroscopic moisture of the pumice, its grindability has become difficult. While the 40 mu m sieve residue of PPCs ranges from 0.8 to 1.7%, the sieve residue ratio generally increases as the pumice volume in-creases. The porous structure of pumice led to an increase in Blaine fineness as the replacement ratio increased. The Blaine fineness of PPCs containing 40% pumice rose by about 20% more than the reference cement. The consistency water of PCs varies between 29 and 36%. As the water consistency increased, the setting time of the pastes was prolonged. Initial setting times of PPCs are between 150 and 220 min. If the CaO/SiO2 ratio decreased with the pumice volume, the compression strength of the mortars decreased. While the 28-day compression strength of PPC containing 10% pumice was measured as 36.2 MPa, this value was measured as 21.6 MPa for PPC containing 40% pumice. As the pumice volume increased, the mortars' drying shrinkage and sulfate-induced expansion values decreased significantly. According to the sustainability analysis, the CO2 emissions of cement vary between 518 and 880 kg CO2/t. By using pumice instead of clinker, CO2 emissions of cement can be reduced. In SEM examinations, it was determined that pumice concentrated the microstructure. As a result, it has been determined that eco-friendly cement can be obtained by using 10% and 20% pumice in PPC production.