Evaluation of Long-Term Water Stability of Acidic Diorite Asphalt Mixtures in Different Environments
The short-term water stability of acidic diorite asphalt mixtures with acid-alkaline composite aggregates mixed with cement(2%cement instead of mineral powder),slaked lime(30%slaked lime water for stone immersion),and anti-spalling agent(modified asphalt with 0.3%anti-spalling agent)was evaluated by Marshall test of immersion,freeze-thaw splitting test,and rutting test.Then,by repeated freeze-thaw splitting test,repeated freeze-thaw and baking splitting test,and repeated acid-etching freeze-thaw splitting test,the long-term water stability of the treated acidic diorite asphalt mixtures in different environments was tested.The results show that the physical and mechanical properties of acidic diorite meet the specification requirements;the short-term water stability of the treated acidic diorite asphalt mixtures is significantly improved and meets the specification requirements.However,the long-term water stability of the acidic diorite asphalt mixtures treated with 0.2%anti-spalling agent is poor at high temperatures.The acidic diorite asphalt mixtures treated with 30%slaked lime water have good long-term water stability and can be recommended for engineering applications.
asphalt mixtureacid dioritefreeze-thawfreeze-thaw and bakingacid-etching
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