水性环氧树脂改性乳化沥青黏结性能试验分析

Experimental Analysis of Adhesive Performance of Waterborne Epoxy Modified Emulsified Asphalt

针对沥青路面养护工程中养护层层间黏结性不足的问题,以水性环氧树脂对乳化沥青进行改性处理,分别通过复合马歇尔试件常温、高温直剪试验以及黏附性试验,分析了水性环氧树脂掺量对沥青层层间黏结性的影响.根据直剪试验结果,确定了水性环氧树脂改性乳化沥青胶结料的最佳涂布量为0.60kg/m^2;与普通乳化沥青胶结料相比,外掺30%(质量分数,下同)水性环氧树脂的改性乳化沥青胶结料可使试件的常温层间抗剪强度提高1倍,外掺40%水性环氧树脂的改性乳化沥青胶结料可使试件的50℃层间抗剪强度提高2.3倍,并与涂布普通乳化沥青胶结料试件的常温层间抗剪强度相近.以水煮试验后粗集料表面的沥青质量残留率作为量化指标来评价改性乳化沥青与集料的黏附性,结果显示,改性乳化沥青胶结料成膜后的抗水损性能随着水性环氧树脂掺量的增加而逐步提高,并在水性环氧树脂掺量达到30%时趋于稳定,最终达到95.3%的沥青质量残留率.试验结果表明,水性环氧树脂可以显著提高乳化沥青的层间黏结性,改善养护层耐久性.

In view of the problem of lack of adhesion between layers in maintenance of asphalt pavement,waterborne epoxy resin was used as modifier to improve the adhesion of emulsified asphalt.According to the influence of temperature and moisture on interlaminar durability,the interlaminar adhesion test of different resin contents was conducted through direct shear test and adhesion test respectively.The interlaminar shear properties were evaluated by composite Marshall test.According to the direct shear test of composite specimens with different interlayer smearing,the best coating amount of cementing material was determined to be 0.60 kg/m 2.And through different resin contents under normal temperature and high temperature shear test,the resin content of 30%can make asphalt emulsion at room temperature,its shear strength is increased by 1 times,with resin content of 40%the shear strength of the ordinary asphalt emulsion at 50℃conditions between layers increases 2.3 times,and close to shear strength of asphalt emulsion under the condition of normal temperature.The adhesion of emulsified bitumen and aggregate can be evaluated effectively by the quantitative residue rate of asphalt quantity after boiling test.The water loss performance of the cemented material after film formation is gradually increased with the increase of resin content,and tends to be stable when the resin content reaches 30%,and the residual rate is up to 95.3%.The experimental results show that waterborne epoxy resin can significantly increase the interlayer adhesion of emulsified bitumen to improve the durability of curing layer.