Abstract
This paper reports the variations of mass, porosity, and wave velocity of sandstone after high temperature heating. The range of temperature to which the sandstone specimens have been exposed is 25–850°C, in a heating furnace. It has been shown that below 300°C, porosity and wave velocity change very little. Above 300°C, there is a rapid increase in porosity, but the wave velocity decreases significantly. The results of thermo gravimetric analysis (TGA), differential scanning calorimetry (DSC) and mercury intrusion porosimetry (MIP) suggest that a series of changes occurred between 400 and 600°C in sandstone could be responsible for the different patterns of variation in porosity and wave velocity.
Highlights
According to the analysis presented above, the thermal damage of sandstone gets larger as the temperature increases
To assess the effect of high temperature on sandstone, the characteristics of mass, pores, wave velocity, and surface features of sandstone specimens before and after heating at different temperatures have been examined in this paper
400°C, sandstone turns into brick red. The increase in porosity depends on the mineralogy of particles and cement
Summary
The properties of rocks at high temperature or after heating at high temperature are parameters of growing importance in engineering projects and studies of geological disasters and geological structure formation (Just and Kontny 2012), such as deep geological repositories for heat-generating radioactive wastes (Laloui et al 2008, Zhao et al 2009), exploration of geo-. It is generally accepted that the wave velocity decreases with temperature both under and after high temperature heating treatment (Somerton 1992). The mechanism of wave velocity and porosity variation at high temperature is not clear, probably because the physical and chemical thermal process of rock is not precisely known and the effect of mineral composition is not well understood. In order to identify the damage level of thermally-cracked sandstone based on the variation of its physical parameters, the variations of some physical properties of sandstone, including mass loss level, porosity, wave velocity, and surface features, were examined after heating treatment in this paper. The heating temperature was varied in a large range, from 25 to 850qC, using a furnace in the laboratory
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