利用国内特有天然橡胶---杜仲胶来建立橡胶粉与沥青之间的化学链接。首先通过橡胶粉干拌杜仲胶后的微观分析和宏观表象，发现杜仲胶的双键结构可以与橡胶粉的硫交联硫化；并将杜仲胶接枝于沥青氨基反应的马来酸酐，在杜仲胶与沥青之间产生化学链接。然后通过对橡胶沥青微观和路用性能，以及干法橡胶沥青混合料高低温、水稳性及力学性能进行试验，研究了杜仲胶、国外进口橡胶反应剂的改性效果。试验结果表明：杜仲胶可以促进橡胶粉的硫化，但没有建立硫化橡胶粉和沥青反应的网络，橡胶沥青混合料性能提高不明显；杜仲胶接枝马来酸酐后，建立了硫化橡胶粉与沥青的反应网络，橡胶沥青混合料性能提高明显，改性效果达到国外产品的水平。因此，杜仲胶只有通过接枝，才能真正达到使橡胶粉与沥青产生化学反应的目的，而这正是干法橡胶沥青混合料的根本。%Domestic natural rubber, the eucommia ulmoides gum( EUG) , was used to create chemi-cal links between rubber crumb and asphalt.After rubber crumb was mixed with EUG, it was found that by the microscopic analysis and macroscopic representation of mixture, EUG owns double bond structure which could be vulcanized with the sulfur of rubber crumb.EUG was grafted with maleic anhydride ( MA) reacting with the asphalt amino-group, and thus chemical links were built between the EUG and asphalt.Then the modification effect of grafted eucommia ulmoides gum, EUG and imports was experimented by the microscopic and performance test of rubber bitumen, the high and low temperature performance, water stability and mechanical property of dry-process rubber bitumen mixture.Test results show that EUG can contribute to the vulcanization of rubber crumb, but it can-not create the reaction network between the vulcanized rubber crumb and asphalt,so the rubber as-phalt mixture performance improvement is not obvious.EUG grafted with MA establishes the re-sponse network of vulcanized rubber crumb and asphalt, so the rubber asphalt mixture performance improvement is obvious, and the modification effect can reach the level of foreign products.There-fore, EUG can only achieve chemical reaction between rubber powder and asphalt through grafting, which is the fundament of the dry rubber asphalt mixture.
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