Variation Pattern of the Stress-Strain Curve of Concrete under Multifactor Coupling

Table 2

Settings for simulation of the natural environment inside and outside shaft lining.

Simulated position	Environment settings				Test procedure	Time
	Gaseous environment (ppm)	Acid mist environment(mg/m^3)	Saline rain environment (%)	Temperature and humidity environment
Internal environment	CO2/12,000	HCl/250	Na2SO4/10	Humidity 95%, temperature 40 °C	Gas injection by spraying two hours at a time, once every two days	45 days per cycle
External environment	_	_	Na2SO4/15	Humidity 100%, temperature 25 °C	Soak

Na₂SO₄ concentration in mass percent.