Abstract
In this paper, uniaxial compression tests, multistage loading tests, and electrochemical tests were adopted to investigate the strain characteristics, failure characteristics, and electrochemical impedance of anchor bolts in a cement-gypsum composite. The uniaxial compression test results showed that the uniaxial compressive strength σ c of the three specimens were 4.4 MPa, 4.0 MPa, and 3.1 MPa, respectively, under three different osmotic pressures. The analysis of the multistage loading tests revealed that the directions of most cracks were approximately consistent with the load-bearing direction. Moreover, the existence of osmotic pressure increased the creep deformation capacity of the specimen; the greater the osmotic pressure, the stronger the deformation capacity of the specimen. The curvature relationship of the total strain curve of the three specimens was KS12 > KS22 > KS32, and the total strain curve of S32 was close to a straight line. When comparing the creep strain variation characteristics of the three specimens, it was found that, with the increase of osmotic pressure, the proportion of creep strain within the total strain gradually increased, while the proportion of corresponding elastic strain gradually decreased. Compared with the specimen before failure, the electrochemical test in the failure stage proved the variability of the Bode curves and Nyquist curves. When the osmotic pressure was 0.15 Mpa, the Bode diagram of specimen S32 in the low frequency band showed a large jump, which was stable after entering the high frequency band.
Highlights
Electrochemical impedance spectroscopy is a technique using a new multidisciplinary perspective for solving geotechnical problems that can describe the state of physical property indicators
Blanco et al [5] first doped recycled polyethylene terephthalate with different geometries in reinforced concrete and put the specimen in sodium chloride corrosion solution for 300 days. e results of electrochemical impedance spectroscopy showed that rectangular, fiber, and rectangular mixed shapes could reduce the corrosion rate of reinforcement in concrete
Under dry and wet conditions, Nishimura [7] proved using the electrochemical impedance spectroscopy test that when the chloride ion concentration in Geofluids concrete exceeds a certain threshold, corrosion and damage will occur in steel
Summary
Electrochemical impedance spectroscopy is a technique using a new multidisciplinary perspective for solving geotechnical problems that can describe the state of physical property indicators This method has the benefits of high speed and convenience and is a nondestructive process in experimental testing [1]. Berrami et al [11] discussed the influence of corrosive soil on the durability of the mortar layer of a prestressed concrete cylindrical pipe and compared the corrosion rate of two mortar layer mixtures with different components by electrochemical impedance spectroscopy. Sohail et al [12] evaluated the corrosion rate of different types of reinforcement in a chloride corrosion environment by electrochemical impedance spectroscopy. A total of 21 electrochemical impedance spectroscopy tests were performed on three specimens. e uniaxial compression test plays a key role in determining the uniaxial compressive strength of specimens. e electrochemical measurement data under different loads and osmotic pressures could be used to characterize the changes in microstructure in the specimens. e specimens’ uniaxial compressive strength σc was measured. en, the change process of stress-strain curves of specimens was analyzed, and the Bode diagram, as well as the Nyquist curves of specimens under multistage load and osmotic pressure, was discussed. e findings hopefully provide a basis to further understand the electrochemical properties of anchored solids
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