Yazar "Eren Sarici, Didem" seçeneğine göre listele

Listeleniyor 1 - 2 / 2
  • Küçük Resim Yok
    Öğe
    Effects of acid-base solutions on some Turkish natural building stones: physico-mechanical and color changes
    (Springer Int Publ Ag, 2022) Ozdemir, Engin; Kantarci, Fatih; Eren Sarici, Didem
    Natural stones are exposed to various physical, chemical and environmental interactions during service life. It is quite important to determine physico-mechanical properties of natural stones for specific applications. This paper presents an experimental study conducted to explore effect of acid and sulfate shocks on some physico-mechanical properties and color of natural stones. For this purpose, five different building stones used as marble (Malatya Beige, Agri Onyx, Adiyaman Crystal Emperador, Diyarbakir Black Pearl, Elazig Rosso Levanto) were supplied from eastern region of Turkey. Point load strength, Schmidt hardness rebound, unit weight, porosity, water absorption and color measurements were conducted on provided natural stones. Additionally, mineralogical properties of natural stones were investigated with XRD and XRF analyses. Then, these natural stones were exposed to chemical shocks with 5% H2SO4 and Na2SO4 solutions for 0, 10, 20 and 30 cycles. Changes in Schmidt hardness, point load strength, porosity, dry weight and color after chemical shock cycles were investigated. Experimental results showed that Diyarbakir Black Pearl (DBP) and Malatya Beige natural stones might be used in aggressive H2SO4 and Na2SO4 environments for structural and ornamental purposes. After 30 cycles of H2SO4 and Na2SO4 shock, minimum decrease in point load values was obtained from DBP samples with 5.97% and 9.15%, respectively. Similarly, decrease in Schmidt harness values of DBP was minimum. Among natural stones exposed to H2SO4 and Na2SO4 shocks, AO sample that had the greatest strength loss was 17.36% and 9.68%, respectively.
  • Küçük Resim Yok
    Öğe
    Estimation of mode I fracture toughness of rocks exposed to different environmental conditions using simple and linear multiple regression
    (Springer, 2024) Ozdemir, Engin; Eren Sarici, Didem
    Mode I fracture toughness (K & imath;c) is a critical parameter in rock mechanics that is essential for understanding how rocks behave under tensile loading and crucial for applications ranging from safety assessments to structural design in geotechnical engineering. This study comprehensively investigates the influence of various environmental conditions (dry, saturated, frozen, thermal shock and thermal aging) on the physico-mechanical properties and K & imath;c of rocks. The primary novelty of this study lies in its comprehensive modeling approach under diverse environmental conditions, providing a nuanced understanding of factors influencing rock fracture toughness. By extending analysis to less-studied conditions such as freezing and thermal shock cycles, the study enhances the predictive capacity of fracture toughness models in practical geotechnical applications. Physico-mechanical properties, including uniaxial compressive strength, point load strength, Brazilian tensile strength (BT), Schmidt hardness, and ultrasonic wave velocity were evaluated across different environmental scenarios. Simple and linear multiple regression models were developed using these properties to predict K & imath;c. Notably, BT emerged as a significant predictor in the simple regression analyzes. Ten linear multiple regression models were formulated using SPSS 20, combining mechanical tests (UCS, BT, PL) with non-destructive testing methods (Vp, Vs, SH), demonstrating robust predictive capabilities with R2 values exceeding 0.95. Performance metrics (mean absolute error, mean absolute percentage error, root mean square error) were used to verify the accuracy of the model.