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- Title
Experimental study of the effect of high temperature on primary wave velocity and microstructure of limestone.
- Authors
Zhang, Weiqiang; Qian, Haitao; Sun, Qiang; Chen, Yuhua
- Abstract
To study the effect of high temperature on the microstructure and velocity of primary wave (P-wave) propagation in rocks, scanning electron microscope (SEM) experiments, mercury injection experiments and P-wave velocity tests were conducted on limestone samples which had been heated at high temperature (from 25 to 900 °C), and then the variations of P-wave velocity and microstructure were analyzed. Consequently, a P-wave velocity-based damage model was established to evaluate the damage level of limestone. The experimental results showed that: (1) the internal defects of limestone started to develop at 300 °C, and the range of 300-600 °C was the main development stage; (2) the porosity increased slowly with the rising of temperature below 200 °C, and rapidly increased above 300 °C; and (3) the P-wave velocity grew a little below 100 °C and decreased tardily in 100-300 °C, and then sharply decreased in 300-600 °C. The P-wave velocity damage model also shows that damage of the samples occurred above 300 °C. This study suggests that 300 °C should be the damage threshold temperature of limestone, and in 300-600 °C, significant damage of limestone would occur.
- Subjects
LIMESTONE; MICROSTRUCTURE; HIGH temperatures; THEORY of wave motion; ROCK deformation; SCANNING electron microscopy
- Publication
Environmental Earth Sciences, 2015, Vol 74, Issue 7, p5739
- ISSN
1866-6280
- Publication type
Article
- DOI
10.1007/s12665-015-4591-4