Preparation of modified red mud powder warm mix agent and study on performance of foamed asphalt
The activated red mud powder was modified by HCl,NaOH and NaCl solutions with a concentration of 1 mol/L.The modified red mud powder warm mix agent and foamed asphalt were prepared,and the effect of warm mix agent on the low temperature rheological properties and aging resistance of asphalt mortar was studied through laboratory tests.The results showed that the best chemical modifier for the activated red mud powder was NaOH.When the foaming temperature was 150 ℃ and the dosage of warm mix agent was 20％,under the condition of reducing the optimal moisture content from 35％to 30％,the expansion rate reaches 7.7 times.After modification,the warm mix agent significantly improved the low temperature rheological properties of foamed asphalt.And the improvement effect was decreased with the increase of warm mix agent content.The modified red mud powder warm mix agent further improved the anti-aging performance of asphalt.With the increase of the content of warm mix a-gent,the improvement effect of thermal oxidative aging resistance was weakened but the ultraviolet aging resistance was enhanced.
modified red mud powderwarm mix agentfoamed asphaltlow temperature rheological propertyaging resistance
万方数据
维普
