微表处专用两性沥青乳化剂表征及应用效果评价

Characterization and Evaluation Applications of Special Gender Asphalt Emulsifier for SBS Modified Micro-surfacing

微表处中沥青乳化剂的相关性能对改性乳化沥青及稀浆混合料性能至关重要.笔者利用油酸、多胺、有机氯酸以及氯醇等为原料合成了两性沥青乳化剂,分析了乳化剂的红外光谱、表面张力、亲水亲油平衡值(HLB值);测试了5%SBS掺量改性乳化沥青的性质和稀浆混合料的技术指标.结果显示:乳化剂的临界胶束浓度为2.63×10-5mol/L,此时表面张力46.11 m N/m;乳化剂HLB值为12.7;当乳化剂用量为1.5%时,改性乳化沥青蒸发残留物的25℃针入度为6.2 mm,软化点为78.5℃,5℃延度为35 cm;微表处混合料60 min凝聚力值达到2.4 N·m,为中度成型,浸水1 h和浸水6 h湿轮磨耗值均满足规范要求.

The properties of asphalt emulsifier in micro-surfacing are an issue of great importance for modified emulsified asphalt and mixture performance. In this paper, a kind of zwitterionie surfactant which can be used for asphalt emulsifier was synthesized by using oleic acid, polyamine, acid and alcohol containing chloride as starting materials. The synthesized asphalt emulsifier was characterized by means of FT-IR, surface tension and the calculated hydrophiliclipophilic balance （HLB） value. The properties of 5% SBS modified emulsion asphalt and the technical parameters of slurry mixtures were also tested. The results showed that the critical miceUe concentration （CMC） of emulsifier was 2.63 ×10-5 moL/L, the surface tension at CMC was 46.11 raN/m, and the calculated HLB value was 12.7. Furthermore, the modified emulsion asphalt showed the best performance when the concentration of emulsifier was 1.5% , and the modified asphalt emulsion evaporation residue 25 ℃ penetration was 6.2 mm, softening point was 78.5 ℃ , 5 ℃ ductility was 35 em ; micro-surfacing mixture 60 min cohesion value reached 2.4 N · m, moderate molding, 1 h and 6 h soaking wet wheel abrasion values were to meet regulatory requirements.