科研之友
微信
新浪微博
Facebook
分享链接
摘要
The strength characteristics and hydration products of reactive magnesia (MgO)-activated ground-granulated blast-furnace slag (GGBS) cement and concrete have been extensively investigated in previous studies. However, very limited study has comprehensively investigated the impacts of drying-wetting cycle on the engineering properties of GGBS-MgO-stabilised soils. This paper presents details of a study dealing with the influences of drying-wetting cycle on the dry density, pH, unconfined compressive strength (q(u)) and secant modulus (E-50) of GGBS-MgO-stabilised kaolin clay. For the purpose of comparison, the conventional Portland cement (PC)-stabilised kaolin clay is selected as a control sample. Several series of and drying-wetting durability and unconfined compression tests were conducted for the stabilised soils. The variations in dry density, mass loss, pH, q(u) and E-50 with drying-wetting cycle are discussed. The results show that the GGBS-MgO-stabilised kaolin clay display higher dry density (similar to 1-7%) and lower mass loss (similar to 10-30%) than the PC-stabilised kaolin clay. The pH values and q(u) of the GGBS-MgO-and PC-stabilised kaolin clay decrease with the increase of drying-wetting cycle. When cured for 93-120 days under the controlled temperature of 20 degrees C and relative humidity of 95%, the GGBS-MgO-stabilised kaolin clay exhibits higher (similar to 1.5 times) q(u) than the PC-stabilised kaolin clay. However, when the drying-wetting cycle exceeds forth, the GGBS-MgO-stabilised kaolin clay displays lower q(u) or E-50 than the PC-stabilised kaolin clay. The measured soil pH has a good linear relationship with q(u) of the soils that experienced drying-wetting durability tests. Finally, the mechanisms underneath the gradual loss of q(u) or E-50 with increasing drying-wetting cycle are discussed.
- 出版日期2016
- 单位东南大学
