SEAM沥青混合料性能及其改性机理研究

测试了SEAM沥青混合料的马歇尔性能指标、高、低温稳定性、水稳定性和疲劳性能。试验结果表明,在掺量大于10%的条件下,SEAM沥青混合料具有较好的抗车辙性能和抗疲劳性能,提高沥青混合料的动稳定度达171%,提高疲劳寿命187%,低温性能与基质沥青混合料相近。应用红外光谱分析研究硫磺改性沥青的机理。红外光谱分析结果表明:当SEAM掺量达到20%和30%时,沥青与硫磺发生充分作用,在沥青中形成氢键和S-H化学键,亚硫酸酯、硫酸酯和砜一类的物质。硫磺改性沥青的机理是硫磺改变了沥青分子间的连接和成分。

Study on the Properties of Sulphur Extended Asphalt Mixture and the Mechanism of Modifying

A new method of modifying asphalt with sulphur is presented and the properties of SEAM modified asphalt mixture are tested. The test results show that,as the agent of SEAM is more than 10 percent,the high temperature stability and fatigue life of sulphur extended asphalt mixture can be obviously improved,the high temperature stability and fatigue life individually increase 171 percent and 187 percent respectively,and the low temperature property is approached to the common asphalt mixture. The mechanism of sulphur modified asphalt is studied with the infrared adsorption spectrum analysis. The infrared adsorption spectrum test results indicates that as the ratio of sulphur to asphalt increases from 20 percent to 30 percent. The sulphur can react the asphalt,and during the curse of reaction,some new chemical compounds with H-、 S-H、RO-SO-OR、RO-SO2-OR、R-SO2-R etc. are produced in asphalt. It is concluded that the mechanism of sulphur improving high temperature properties of asphalt is the bonding force among asphalt molecules and the chemical composition of asphalt are changed by the sulphur.