阳离子乳化剂对沥青感温性能的影响

EFFECTS OF CATIONIC EMULSIFIERS ON THE TEMPERATURE SUSCEPTIBILITY OF ASPHALT

考察了CAP-3和CAP-1两种阳离子乳化剂及其用量对中海油AH-90、克拉玛依AH-90和江阴AH-70三种沥青蒸发残留物感温性能[包括针入度指数(PI)、当量软化点(T800)、当量脆点(T1.2)和黏温指数(VTS)]的影响。结果表明:在乳化剂用量(w)为0～5.0%时,随着CAP-3用量的增加,中海油AH-90和江阴AH-70蒸发残留物的PI均降低,从而使其在中温时的感温性能变差,克拉玛依AH-90蒸发残留物的PI呈先增加后降低的变化趋势,而CAP-1对三种沥青在中温时的感温性能影响不大;CAP-3可降低三种沥青的T1.2,从而使其低温抗裂性能变好,而CAP-1对三种沥青的低温抗裂性能影响不明显;CAP-3可显著降低三种沥青的T800,使沥青在中高温时的抗塑性变形能力变差,随其用量增加,三种沥青蒸发残留物T800均呈降低趋势,且降低幅度由大到小的顺序为:江阴AH-70≈中海油AH-90>克拉玛依AH-90,而CAP-1对三种沥青在中高温时的抗塑性变形能力影响不大;CAP-3使中海油AH-90和克拉玛依AH-90在高温时的感温性略有增加,使江阴AH-70在高温时的感温性有所降低,而CAP-1使三种沥青在高温时的感温性略有增加。

The effects of two cationic emulsifiers （CAP-3 and CAP-l） and their content on the tern-perature susceptibility performance of the evaporation residue of asphalt emulsion, such as penetration index （PI）, equivalent breaking point （T1.2）, equivalent softening point （Ts00） and viscosity index （VTS）, were investigated, in which three asphalt samples （Zhonghai AH-90, Karamay AH-90 and Jiangyin AH-90） were involved. Test results show that for emulsions having emulsifier mass fraction in the range of 0-5.0 %, the PI of evaporation residues from Zhonghai AH-90 and Jiangyin AH-70 asphalt emulsions decrease with the increase of CAP-3 emulsifier content, which indicates that their temperature susceptibilities at the medium temperature range degrade, besides, the PI changing trend of evaporation residue from Karamay AH-90 asphalt emulsion goes up firstly followed by decline with the increase of CAP-3 content; however, CAP-1 emulsifier has little effect on the three asphalts in this case. The low temperature crack resistance of these three asphalt samples is improved by adding CAP-3 emulsifier as shown by the reduction of T1 2, while CAP-1 emulsifier has less impact. Adding CAP-3 emulsifier could decrease the T800 of evaporation residues from these three asphalt samples significantly, thus the plastic deformation resistance at mid-high temperature range of these three samples deteriorates, the reduction sequence is Jiangyin AH-70≈Zhonghai AH-90〉 Karamay AH-90; nevertheless, the effect of CAP-1 emulsifier in this case is also insignificant. For high temperature susceptibility, with the increase of CAP-3 emulsifier content, Jiangyin AH-70 trends to decrease, Zhonghai AH-90 and Karamay AH-90 trend to increase slightly; this time adding CAP-1 emulsifier shows somewhat raise trends for all the three asphalt samples.