改性方法对生土材料水分传输特性的影响

Influence of Modification on Characteristics of Moisture Transportation of Earth Materials

通过未改性生土材料、水泥改性生土材料、黄麻改性生土材料和水泥/黄麻复合改性生土材料的毛细吸水试验,研究了改性方法对生土材料毛细吸水速率、毛细吸收系数和表面渗入深度等水分传输参数的影响及其作用机理.结果表明:生土材料的毛细吸水量与时间平方根呈线性关系;水泥改性生土材料的毛细吸收系数和初始吸水速率较未改性生土材料的毛细吸收系数和初始吸水速率分别降低19.8%和25.3%,而黄麻改性生土材料的毛细吸收系数和初始吸水速率分别提高了43.4%和26.2%;黄麻纤维明显提高了生土材料水分的表面渗入深度;水泥改变了黄土颗粒表面状态和生土材料的孔结构,从而影响了生土材料的水分传输特性.

The influence of modification on the characteristics of moisture transportation of earth materials was discussed.Development of capillary absorption rate,capillary absorption coefficient and surface infiltration depth with different modification methods,such as modified by cement,by jute and by composite of above two,was researched through capillary absorption test.The results show that there exists linear relationship between capillary absorption quantity and square root of time.Comparing with original earth materials,capillary absorption coefficient and initial absorption rate of cement modified earth material is reduced by 19.8%and 25.3%respectively,and while that of jute modified earth material is increased by 43.4%and 26.2%.Modification of jute on surface penetration depth of original earth materials is obvious.The pore distribution of earth materials and surface state of soil particles is changed due to the modification effect of cement,and therefore,moisture transportation characteristics of earth materials is accordingly changed.