摘要
为解决宁夏水泥土受到盐类侵蚀和干湿-冻融循环作用性能劣化的问题,以宁夏同心水泥黄土为研究对象,试验设置不同压实度和水泥掺量,考虑盐浓度作用,并结合宁夏地区干湿性、季冻性等区域性特点对水泥土进行不同浓度溶液浸泡下的干湿-冻融循环试验,探究多重因素影响下试样外观、质量、波速、强度、电阻率、含盐量等变化情况。结果表明:压实度和水泥掺量越大,试样的质量、波速、强度也越大。随着干湿-冻融循环次数增加,水泥土试样在硫酸钠作用下均表现出电阻率下降,含盐量上升,质量先增后减,表面脱落受损,峰值强度和残余强度指数下降,波速下降。硫酸钠的劣化作用随浓度升高而增强。
In order to solve the problems of salt erosion and deterioration of cement-soil properties under dry-wet and freeze-thaw cycles in Ningxia,cement loess in Tongxin County,Ningxia was taken as the research object,different compactness and cement content were set in the test.Considering the effect of salt concentration,and combined with the regional characteristics of dry wet and seasonal freezing in Ningxia,the dry wet freeze-thaw cycle test of cement soil soaked in different concentrations of solution was carried out to explore the appearance,quality Changes in wave velocity,strength,resistivity,salt content,etc.The results show that the higher the compactness and cement content,the higher the mass,velocity and strength of the sample.As the number of dry-wet and freezethaw cycles increases,the resistivity of cement-soil samples decreases under the action of sodium sulfate,the salt content increases,the mass first increases and then decreases,the surface shedding is damaged,the peak strength and residual strength index decrease,and the speed of wave decreases.The deterioration effect is more obvious when the concentration of sodium sulfate increases.
作者
刘慕宸
崔自治
宋鑫
LIU Mu-chen;CUI Zi-zhi;SONG Xin(College of Civil and Hydraulic Engineering,Ningxia University,Yinchuan 750021,China)
出处
《科学技术与工程》
北大核心
2022年第29期12977-12984,共8页
Science Technology and Engineering
基金
国家青年科学基金(51808302)
宁夏高等学校科学研究项目(NGY2018027)。
关键词
硫酸钠
水泥土
耐久性
力学性能
干湿-冻融循环
劣化
sodium sulphate
cement soil
durability
mechanical properties
dry-wet and freeze-thaw cycle
deterioration
