水性增黏树脂改性乳化沥青室内试验研究

Study on Laboratory Test of Emulsified Asphalt Modified with Water-based Tackifying Resin

制备不同掺量水性增黏树脂的改性乳化沥青,研究乳化沥青蒸发残留物常规性能、层间黏结力学性能和相结构随树脂掺量的变化规律,评价水性增黏树脂改性乳化沥青的路用性能,并确定树脂的最佳掺量。结果表明:水性增黏树脂能够改善乳化沥青高温稳定性,提高层间抵抗黏结破坏和剪切破坏能力,但对低温延度有不利影响。随增黏树脂掺量增加,改性乳化沥青体系逐渐形成致密的交联网络结构,但在掺量为25%时存在类似聚合物团聚的风险,且出现较为严重的低温抗裂性能衰减,建议实际工程中水性增黏树脂掺量宜在15%-20%。

The modified emulsified asphalt with different dosages of water-based tackifying resin is prepared.The conventional properties of emulsified asphalt evaporated residue,the mechanical properties of interlayer adhesion and the phase structure with the change rule of resin dosage are studied.The pavement performance of the emulsified asphalt modified by water-based tackifying resin is evaluated and the optimal dosage of resin is determined.The results show that the water-based tackifying resin can improve the stability of emulsified asphalt at high temperature and increase the resistance to bond failure and shear failure between layers.But it has an adverse effect on the low-temperature ductility.With increase of tackifying resin dosage,the modified emulsified asphalt system gradually forms a dense cross-linked network structure.However,when the dosage is 25%,there is a risk similar to polymer agglomeration,and serious low temperature cracking resistance attenuation occurs.It is suggested that the dosage of water-based tackifying resin should be 15%~20%in actual projects.