The cement-fly ash stabilized crushed-stones were prepared with different SO_3 contents and their 28 d splitting strength,28 d compressive resilient modulus, expansion-shrinkage and dry shrinkage anti-cracking coefficients were studied. On this base,the influence of SO_3 content on mechanical performance and dry shrinkage cracking resistance of the materials was investigated.It is proved that when SO_3 content is 5.8%(by mass), the mechanical performance and dry shrinkage cracking resistance of cement-fly a...