Research on high-temperature stability and freeze-thaw durability of cement fly ash stabilized aeolian sand and crushed stone base course in arid desert regions
To satisfy the requirements on the base course construction for asphalt pavements in arid desert regions,the high-temperature stability and freeze-thaw durability of cement-fly ash stabilized aeolian sand and crushed stone mixtures were investi-gated. The effects of compaction coefficients and curing temperatures on the mechanical properties were studied via compaction,high-temperature curing,freeze-thaw durability,and pH determination tests. The findings reveal that as the temperature rises,the compressive strength of the mixture increases,and the aeolian sand content along with the compaction coefficient can synergistically enhance the strength. Freeze-thaw cycle tests indicate that the durability of the mixture decreases,especially in a 2％ Na2SO4 solu-tion,where the spalling of aeolian sand exacerbates the deterioration of the material. An intensity evolution model was established,taking into account the effects of freeze-thaw cycles,aeolian sand content,and compaction coefficient. Model validation demon-strates high accuracy and reliability. The results suggest a promising potential for aeolian sand in the base course of asphalt pave-ments as an alternative fine aggregate .
aeolian sand and crushed stonefly ashhigh-temperature curingfreeze-thaw cycleevolution model
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维普
