Scopus İndeksli Yayınlar Koleksiyonu
Permanent URI for this collectionhttps://hdl.handle.net/20.500.12573/395
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Article Harnessing Raw Materials in Cement Plants for the Production of Limestone Calcined Clay Cement(Taylor & Francis Ltd, 2026-04-06) Atasever, Muhammet; Erdogan, Sinan TurhanReliance on kaolinite clay in limestone calcined clay cement (LC3) can create availability issues. This study compared a kaolinitic clay obtained from an industrial pit with four other clays used as sources of silica in cement plants, exploring their potential for LC3 production. Three cements were prepared; gray, white, and a composite cement with slag, to investigate the interaction and synergy between the clinker and clay in LC3. Inert quartz was used to replace the clay, limestone, or both components of the mixtures, to evaluate their separate and combined effects on strength, mineralogy, and heat evolution. Several of the LC3 mortars made with the non-kaolinite clays had higher 1-7 d strengths, by up to 60 %, than the LC3 with gray cement and kaolinite which reached similar to 48 MPa strength at 28 d). Carboaluminate formation depends on clinker type, while its quantity is influenced more by the type of calcined clay.Article Citation - WoS: 47Citation - Scopus: 53Enhancement of Pozzolanic Activity of Calcined Clays by Limestone Powder Addition(Elsevier Sci Ltd, 2021-05) Argin, G.; Uzal, B.The influence of limestone powder addition on pozzolanic reactivity of calcined clays were investigated. Two clays containing kaolinite and halloysite in their compositions were obtained from different deposits in Turkey and physical, mineralogical, and morphological properties of the raw and calcined clay were characterized. Pozzolanic reactivity of calcined clays with and without limestone powder addition was then examined by means of lime consumption in lime-calcined clay pastes and their isothermal calorimetry as well as strength activity index test. Limestone powder addition enhanced the pozzolanic reactivity of calcined clays by increasing lime consumption and presenting higher heat of reaction released during pozzolanic activity. Limestone addition also provided benefits of reduced water requirement and increased strength activity for calcined clays. Improvements in pozzolanic reactivity and strength activity of calcined clays with limestone powder addition were attributed to nucleation effect provided by limestone particles and also formation of carboaluminate phases during pozzolanic reaction. (C) 2021 Elsevier Ltd. All rights reserved.Article Citation - WoS: 4Citation - Scopus: 4Characterization of Limestone Calcined Clay Cement Made With Calcium Sulfoaluminate Clinker(Springer int Publ Ag, 2024-07-02) Atasever, Muhammet; Erdogan, Sinan TurhanThis study concentrated on producing limestone calcined clay calcium sulfoaluminate cement by replacing portland cement in limestone calcined clay cement with calcium sulfoaluminate cement, with the goal of increasing the early strength of limestone calcined clay cement. The mineralogy and microstructures of hydrating pastes were investigated using x-ray diffraction and scanning electron microscopy. Heat evolution was studied using isothermal calorimetry. Strength development and workability were assessed on mortar samples. The 1 day strengths of limestone calcined clay calcium sulfoaluminate cement samples exceeded those of limestone calcined clay cement by similar to 30-80%, though its strength gain slows significantly after 1 day due to the lack of calcium silicates, affecting pH and clay dissolution. Despite this, the strength development of limestone calcined clay calcium sulfoaluminate cement, when adjusted for CO2 emissions, is comparable to limestone calcined clay cement. Additionally, limestone calcined clay calcium sulfoaluminate cement provides a 10-15% higher flow and exhibits a lower heat of hydration beyond 12 h, while maintaining a production cost similar to that of limestone calcined clay cement.