温度、湿度循环条件下砂岩物理特性试验研究

Experimental study of physical properties of sandstone under the cycling conditions of temperature and humidity

砂岩风化剥落现象是很多文物古迹常见的病害问题,为了探究砂岩在季节性变化气候中的风化规律性,进行了变温循环,干湿循环,以及温度、湿度共同作用下的循环实验。得到结论:砂岩风化速度随温度升高加快,常温下单一温度循环变化对风化速度的影响缓慢;常温下湿度的循环变化对砂岩风化速度不产生影响;温度与湿度共同循环作用下,砂岩表现出一定的风化现象。在年复一年的气候变化中,砂岩存在一定程度的风化作用,随着时间的推移风化程度逐渐变得稳定,并更具规律性。

The weathering and spalling phenomenon is the most common disease of cultural relics. In order to examine the weathering regularity of sandstone under the change in seasonal climate, the temperature cycle test, dry/wet cycle test, temperature and dry/wet cycle test were carried out. The results indicate that the velocity of sandstone weathering speeds up with the increasing temperature but the effect of a single temperature cycle at room temperature on the speed of sandstone weathering is slow. Humidity has little effect on the rate of weathering at room temperature. However, under the effect of temperature and humidity, sandstone shows intensive weathering phenomena. There is a certain degree of weathering acting on sandstone in the climate change from year to year. The range in weathering with time will gradually become stable and regular.