Abstract: The unconfined compressive strength and road-use performance of lime-flyash stabilized weathered sand were researched through unconfined compressive strength test. Different dosages of lime and flyash were added into the weathered sand of the three gorges reservoir, and lime content, lime-flyash ratio, as well as age varied during the test. The aim of this research is to provide basis for the proportioning of lime-flyash stabilized weathered sand used as base or subbase. Furthermore, range analysis and multi-factor variance analysis were conducted to analyse the influence of lime dosage and lime-flyash ratio on the unconfined compressive strength. Results show that weathered sand stabilized by lime and flyash can be used as the subbase of highway and primary highway, or the base of secondary and under-secondary highway. At a certain dosage of lime and the same lime-flyash ratio, the unconfined compressive strength increases with the increase of age, but this increment speed differs greatly. Lime is the primary factor which affects the strength, and lime-flyash ratio is the secondary factors. Moreover, the optimal proportion of lime-flyash stabilized weathered sand was obtained.

Key words: weathered sand, lime-flyash, unconfined compressive strength, age, range analysis, variance analysis multiple factors, optimum proportion