Research on Strength and Water Stability of Cement Stabilized Sandstone Pavement Subgrade
In order to analyse the effect of sandstone on the strength and water stability of pavement subgrade,the development of the unconfined compressive strength,splitting strength and water stability of cement-stabilised aggregates with different sandstone replacement rates were investigated with respect to the age of maintenance.In addition,the damage pattern of the specimens and the relationship between the unconfined compressive strength and the splitting strength were analysed.The results showed that the unconfined compressive strength,splitting strength and water stability of the cement-stabilised aggregates decreased with the increase of sandstone replacement rate,and when the sandstone replacement rate was 100％,the unconfined compressive strength decreased by 44.1％,21.8％,20.0％,23.4％at 7,28,60,90 d,respectively,compared with the unconfined sandstone specimens.38.8％,21.9％,29.6％,29.9％respectively,while the softening coefficient of the specimens was less than 0.85 when the sandstone replacement rate exceeded 50％,indicating that the cement-stabilised gravel mix was less resistant to water damage at this time.The damage type of the compressive specimens was the same as that of the conventional cement-stabilised aggregates,which was central compressive damage,and the damage of the split specimens was mainly caused by the damage of the interface transition zone and coarse aggregates.In addition,there is a strong linear correlation between the unconfined compressive strength of the cement-stabilised aggregates mix and the splitting strength.Considering the effect of sandstone on the strength and water stability of the pavement subgrade,the sandstone replacement rate should not be higher than 50％.
万方数据
