乳化条件对高黏改性乳化沥青储存稳定性的影响

摘要

The effects of preparation conditions such as emulsion temperature and emulsifier solution,outlet pressure of colloid mill,emulsifier content as well as SBS content in modified asphalt on the storage stability of high viscosity modified asphalt emulsion(HVMAE) were investigated.The relations between average size of high viscosity emulsified asphalt and storage stability were studied by laser particle analyzer.The results show that the storage stability of HVMAE firstly decreases and then increases as emulsion temperature and SBS dosage increases,but reduces first followed by a slow decline trend with the increase of outlet pressure of colloid mill,indicating a positive relations of storage stability with average particle size.Under the optimum conditions:SBS modified asphalt at 165 ℃,emulsifier solution temperature of 55 ℃,outlet pressure of colloid mill 0.2 MPa,dosage of emulsifier 0.4％ and SBS content in modified asphalt 3.2 ％,the prepared HVMAE was applied successfully in overhaul project for Beijing west Chang'an Avenue in 2014 and 2016.%考察了制备工艺(乳化温度和磨出口压力)、乳化剂用量和改性沥青中SBS含量对高黏改性乳化沥青储存稳定性的影响.通过激光粒度仪测定高黏改性乳化沥青平均粒径,探讨高黏改性乳化沥青平均粒径与其储存稳定性的相关性.结果表明:高黏改性乳化沥青的储存稳定性数值随乳化温度的升高和改性沥青中SBS含量的增加均呈先降低后增加趋势,随胶体磨出口压力和乳化剂用量的增加均呈先降低后趋于变缓趋势;高黏改性乳化沥青的储存稳定性数值与其平均粒径呈正相关.在优化工艺条件下,即SBS改性沥青温度为165℃、乳化剂溶液温度为55℃、磨出口压力为0.2 MPa、乳化剂用量为0.4％及改性沥青中SBS含量为3.2％时,制备出的高黏改性乳化沥青已成功应用在2014年和2016年的西长安街大修工程中.