水性环氧树脂乳化沥青在高温、低温和浸水条件下的粘结性能

以水性环氧树脂(WER)为改性剂,通过其与固化剂的物理-化学交联反应对乳化沥青进行改性,制备成一种理想的路面粘层材料——水性环氧树脂乳化沥青(WEREA)。采用剪切和拉拔试验,在不同温度、层间纹理和浸水时间条件下,将不同WER掺量的WEREA与普通乳化沥青和SBS改性乳化沥青进行对比试验,研究了WEREA的高温、低温和浸水粘结性能。结果显示,在试验研究范围内,随着WER掺量的增加,WEREA的层间性能显著改善;温度越高,粘层材料粘结性越差,但高温、低温条件下,WEREA的抗剪、抗拉强度均大于对照试验组。可以认为,WER通过交联作用有效改善了粘层材料的强度和层间粘附性,减缓了WEREA粘结性随浸水时间延长而降低的速率,显著提高了粘层材料的浸水粘结性。

The Adhesion Performance of a Waterborne Epoxy Resin Emulsified Asphalt: a Study Under High- & Low-temperature and Water-immersion Environments

The present work made a successful endeavor to prepare a favorable pavement adhesive layer material —waterborne epoxy resin emulsified asphalt (WEREA),by modifying the emulsified asphalt through the cross-linking reaction between curing agent and waterborne epoxy resin (WER),the latter of which served as the modifier.We then conducted a comparative analysis with respect to the adhesion performances under high-temperature,low-temperature and water-immersion environments via the shear test and pullout test (with various testing temperature,interlayer texture and water immersion duration)upon the ordinary emulsified as-phalt,SBS modified emulsified asphalt,and the resultant WEREAs differing in WER content.The results showed that the interlayer performance of WEREA improves considerably with the increase of WER contents.The higher temperature could lead to the decaying shear strength and pullout strength,both of which are superior to those of the ordinary emulsified asphalt and SBS modified emulsi-fied asphalt.Our experiment suggested the conspicuous positive influence of the WER's cross-linking effect to the interlayer mate rial's strength and the interlayer adhesion,and in consequence,the deceleration of the water-immersion-induced decline in WEREA's adhesion,and the adhesive material's water stability is improved significantly.