Road subgrade stabilization with cement-coated geotextile under static and cyclic loading

In the current study, the use of cement-coated geotextile (CCG) in subgrade stabilization was evaluated through static and repeated load tests. Static load tests showed that the use of CCG resulted in a maximum improvement factor (IF) of 6.86 and a settlement reduction (PRS) of 92.69%, compared to 3.80 and 75.05%, respectively, for uncoated geotextile. Repeated load tests revealed that CCG reinforcement yielded the highest Traffic Benefit Ratio (TBR) of 110 at 33 mm deformation and a maximum Rut Depth Reduction (RDR) of 53.31% after 5000 load cycles, whereas uncoated geotextile reinforcement resulted in a TBR of 36.89 at 46 mm deformation and an RDR of 35.42%. This study also introduces a novel parameter, the reinforcement efficiency factor (uz), which reflects the combined influence of factors such as reinforcement depth, number, and vertical spacing between reinforcements. The bearing pressure values obtained from static loading tests for three different cases were analyzed in relation to the uz values. The analysis revealed a strong correlation between bearing pressures and uz, with R2 values of 0.9896, 0.9919, and 0.9953 for the CCG-reinforced case and 0.84, 0.9626, and 0.9902 for the G-reinforced case at deformation levels of d = 0.05 D, d = 0.10 D, and d = 0.15 D, respectively.