Effect of Weathering Tests on Microfracture Properties of the Massive and Vesicular Basalts

Topal, Tamer
Petrographic investigations not only provide knowledge on the mineralogical state and provenance of rock materials, they also can be used as a strong tool for evaluating its weathering potential and durability. It is known that the type, amount, dimension, orientation and density of cracks have a great influence on the weathering of the stone material. The chemical agents, for instance, that cause weathering in rock materials, use cracks to penetrate their depths. This study aims to understand how accelerated weathering tests (wetting-drying; freezing-thawing and salt crystallization) affect the behavior of the microfractures. To conduct microfracture studies, a total of nine massive and vesicular basalt samples were questioned. Thin and polished sections were prepared and investigated using optical microscopy and back-scattered views obtained from the Electron Probe Microanalyser (EPMA). Through the investigation, type, amount, orientation and density of the microfractures were examined. Overall results of this examination suggest that aging tests have different impacts on the microfracture properties of the basalts. It can be easily stated that the pore pressure, especially after the freezing-thawing cycles and salt crystallization, triggers microfracture development. Additionally, this study indicated that the crystal boundaries of olivine and pyroxene are the weakest zones for the microcrack formations.


Effect of Cu addition on the microstructural constituents and mechanical properties of twin roll cast AlFeMnSi alloys
Meydanoglu, Onur; Birbaşar, Onur; Ulus, Ali; Beyhan, Bariş; Kalay, Yunus Eren (2015-01-01)
In this study, the effect of copper addition on microstructural evolution, mechanical and corrosion properties of twin roll cast (TRC) AlFeMnSi alloy system mainly used in container foil applications was investigated. Microstructural characterization studies were conducted on as-cast, homogenization annealed and final products by employing optical and scanning electron microscopes. The mechanical properties of the samples obtained from compositional were determined at the thickness of final product by tensi...
Effect of test methods on the performance of fiber reinforced concrete with different dosages and matrices
Hetemoğlu, Yalçın Oğuz; Yaman, İsmail Özgür; Department of Civil Engineering (2018)
Through the last few decades, the idea of adding fibers in to concrete has been quite improved, considering the significant contribution of fibers to the mechanical properties of concrete such as tensile strength, energy absorption capacity and ductility. As a result of many intensive research Fiber Reinforced Concrete (FRC) has become a high-tech material that ensures great performance yet needs efficient design and application. However, the lack of a universally accepted approach and standardized test met...
Effect of pick blunting on cutting performance for weak moderate rocks
Doğruöz, Cihan; Bölükbaşı, Naci; Department of Mining Engineering (2010)
The laboratory cutting specific energy is widely used to estimate the cuttability of rocks by a roadheader fitted with sharp picks. Sharp picks on the other hand become blunt due to wear in time and require replacement. Although it is known that the pick blunting affects adversely the rock cuttability, no study exists to show the relationships between the degree of pick wear and the cutting specific energy obtained by standard cutting tests. In this study, standard cutting tests were carried out on differen...
Effect of axial stresses on reservoir rocks
Kök, Mustafa Verşan; Buket Ulker, E. (2002-10-01)
The effect of axial stresses on rock is known to affect porosity, permeability, and rock compressibility and will be important in some reservoir rock types that are buried deep and at high temperatures. The aim of this project is to determine reservoir rock properties under in situ stress conditions and to observe the effects of axial stresses on reservoir rocks. For this purpose, a uniaxial stress device, which is capable of applying axial stress to the core samples, was used. The core samples chosen were ...
Effect of wave grouping, spectral shape and exreme waves in a wave train on the stability of rubble mound breakwaters
Özbahçeci Öztunalı, Bergüzar; Ergin, Ayşen; Department of Civil Engineering (2004)
There are some empirical formulas used in the design of rubble mound breakwaters to find the weight of armour layer stone. The effect of wave grouping and spectral shape could not put into these design formulas since their effects are still under question. The influences of wave groups and spectral shape on the stability of rubble mound breakwaters have been investigated by several researchers up to now. However, results were not conclusive in these researches, where different wave grouping and spectral sha...
Citation Formats
F. DURSUN and T. Topal, “Effect of Weathering Tests on Microfracture Properties of the Massive and Vesicular Basalts,” presented at the Monument Future: Decay and Conservation of Stone. Proceedings of the 14th International Congress on the Deterioration and Conservation of Stone, eds. S. Siegesmund and B. Middendorf, 2020, Accessed: 00, 2021. [Online]. Available: https://hdl.handle.net/11511/91550.