Abstract

This paper presents an investigation into the coupled effects of chemical corrosion (by Nitric acid solution) and freeze-thaw cycles on the physical and mechanical properties and damage deterioration of tonalite specimens. The experiments included the uniaxial compression test, three-point bending test, the Young’s modulus test, the X-ray diffraction test and the scanning electron microscope test. The damage condition of tonalite specimens was analyzed using scanning electron microscope (SEM). The experimental results reveal that chemical erosion has a significant influence on the propagation of micro cracks and accelerates the development of damage in the tonalite samples under monotonic loading. Due to cementation, no noticeable difference in uniaxial compressive strength was observed between the specimens subjected to combined effects of chemical corrosion and freeze-thaw cycles and those subjected to freeze-thaw cycles only. The amount of cementing materials in the chemically treated samples was found using SEM, which shows that chemical reactions promoted mechanical properties to some extent.

Highlights

  • Granitic rock is widely distributed on the earth’s mantle and is extensively used in engineering projects

  • The average peak strain of tonalite specimens subjected to freeze-thaw cycles (G3) is shown to decrease with decreasing freezing temperature

  • Based on the above results, it can be indicated that the creation of colloidal SiO2 particles is the main factor which leads to the cementation effect in tonalite specimens, especially the tonalite specimens subjected to the coupled effects

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Summary

Introduction

Granitic rock is widely distributed on the earth’s mantle and is extensively used in engineering projects. The variation in mechanical properties of granitic rock subjected to the combined effect of chemical corrosion and different freeze-thaw cycles has been experimentally studied. The physical and mechanical properties of white sandstone subjected to different chemical corrosion and freeze-thaw weathering under uniaxial and tri-axial compression tests have been investigated [29,30]. The uniaxial compression tests have been to investigate the behaviour of yellow sandstone subjected to the combined effects of chemical corrosion and freeze-thaw cycles [29]. Most of the studies on the combined effect of chemical corrosion and freeze-thaw weathering have focused on the physical and mechanical changes with different numbers of freeze-thaw cycles, the effect of minimum freezing and thawing temperatures has been ignored. This paper presents a study on the relationship between macro and micro mechanical properties of rocks and minerals subjected to the combined effect of chemical corrosion and freeze-thaw weathering. The results of this study would play an important role in decision-making for engineers in a practical engineering setting

Specimen Preparation
Physical Properties
Equipment
Test Procedure
Young’s
G1 group but but theythey do not
Uniaxial Compressive Strength
Peak Strain
The Compressive Stress-Strain Curves for the G4
Three-Point Bending Test
KIC of untreated tonalite specimens is IC of untreated
K-feldspar
XRD Analysis
SEM Observation
In comparison to the
12. Figure
Discussion and Conclusions
Full Text
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