Assessment of the suitability of clayey and sandy gypsum deposits from the Çankırı region (Türkiye) for plaster production

Authors : Ali Osman Taş, Kıymet Deniz, Yusuf Kagan Kadıoğlu, Turgay Beyaz

Pages : 1383-1390

Doi:10.65206/pajes.04302

View : 95 | Download : 165

Publication Date : 2025-12-17

Article Type : Research Paper

Abstract :This study evaluates the suitability of clayey and sandy gypsum deposits from the Çankırı region of Türkiye for use in plaster production. Samples were collected in their natural state, without beneficiation or additives, to reflect realistic field conditions. Chemical compositions were determined by XRF, mineralogical phases were identified using XRD and Raman spectroscopy, and textural features were assessed by thin-section petrography. Results show that most samples contained SO₃ and CaO levels consistent with high-purity gypsum. One sample exhibited elevated SiO₂ and Al₂O₃ contents, as well as accessory phases such as quartz, calcite, and clays, and was therefore excluded from further evaluation. Petrographic observations indicated that most of the samples displayed homogeneous fabrics comparable to the industrial reference, while only one sample exhibited more heterogeneous features. Mechanical tests demonstrated that the uniaxial compressive strength increased from 1.51 MPa at 7 days to 2.84 MPa at 90 days, whereas the flexural strength rose dramatically from 0.62 MPa at 28 days to 1.52 MPa at 90 days. These results indicate that even without pre-treatment or reinforcement, natural clayey and sandy gypsum from Çankırı can achieve mechanical performance comparable to conventional plaster materials, highlighting their potential for cost-effective and sustainable construction applications.
Keywords : Çankırı, jips, sıva, materyal dayanımı, sürdürülebilir ürün

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