What types of chemical weathering are effective on rock surfaces for short durations?

Predicting the lifetime of rock materials based on their physical and mechanical properties is essential in engineering geology. This study investigated chemical weathering that may occur after three years in natural building blocks tested in examination tanks at meteorological stations in seven major cities. All tested samples were obtained from quarries within the borders of the Türkiye provinces where the examination tanks were located. X-Ray Fluorescence (XRF), Scanning Electron Microscopy (SEM), thin section examinations, methylene blue tests, capillary water rise tests, and colour change determination analyses were performed at the end of the third year. In a short period, colour changes were observed, and the dissolution of the carbonate rock samples was determined. The capillary level and the weight gain due to capillary water absorption of the field samples was higher than that of the fresh samples. The increase in the electrical conductivity (EC) values of the water accumulated in the examination tank after three years showed that the travertine samples in the tank had dissolved. In addition, the chemical weathering index (CIW)and Parker index (PI) values of the ignimbrite samples exhibit slight changes. Keywords: ignimbrite; travertine; colour change; chemical weathering indices; capillary water rise; dissolution