水性环氧树脂改性乳化沥青的制备及性能表征研究

Preparation and Performance Characterization of Waterborne Epoxy Resin Modified Emulsified Asphalt

为改善乳化沥青抗剥落性能差、粘结性能低和强度低等问题,利用水性环氧树脂(Waterborne Epoxy Resin,WER)的优良性能制备水性环氧改性乳化沥青(Waterborne Epoxy Modified Emulsified Asphalt,WEREA)。通过拉伸强度和断裂伸长率优选固化剂掺量,制备性能良好的WER;以不同WER剂量对乳化沥青进行改性,最后通过拉伸试验、水煮实验、蒸发残留物三大指标,拉拔试验、层间抗剪等室内实验对WEREA的相关性能进行表征,确定其最优掺量。结果表明:固化剂掺量为环氧树脂总量的45%左右时,具有良好的拉伸强度和断裂伸长率,而WER掺量为乳化沥青的15%时改性沥青综合性能最优;针入度和延度随WER的增加而逐渐降低,软化点却与之相反,高于15%以后其粘附等级为5;常温和高温条件下相同掺量的WER改性效果均高于高粘SBS,且当WER掺量为15%时其改性效果趋于平缓,此外层间抗剪强度随WER的增加而逐渐增加,常温抗剪强度显著高于高温环境下的抗剪强度。

To address issues such as poor stripping resistance,low adhesion,and low strength in emulsified asphalt,waterborne epoxy resin(WER)was utilized to prepare waterborne epoxy modified emulsified asphalt(WEREA),leveraging the excellent properties of WER.The optimal amount of curing agent was determined based on tensile strength and elongation at break,resulting in the preparation of high-performance WER.Emulsified asphalt was then modified using various doses of WER.The performance of WEREA was characterized through laboratory experiments liketensile tests,boiling tests,tests for the three major indicators of evaporation residue,pullout tests,and interlayer shear tests to determine the optimal dosage.The results indicated that a curing agent dosage of approximately 45%of the total epoxy resin yielded good tensile strength and elongation at break.The optimal performance of the modified asphalt was achieved with a WER dosage of 15%of the emulsified asphalt.Penetration and ductility decreased with increasing WER content,while the softening point increased.The adhesion level was rated at 5 for WER content above 15%.The modification effect of WER was superior to highviscosity SBS under both room and high-temperature conditions,and it stabilizes at a 15%WER dosage.Additionally,interlayer shear strength increased gradually as WER content was rising,and the shear strength at room temperatures was significantly higher than that at high temperatures.