CAJ | 학술논문

为明确理解天然沥青改性沥青分子量分布特征与沥青宏观技术性能之间的联系，采用凝胶色谱方法分析不同掺量天然沥青改性沥青的重均分子量、数均分子量、峰值分子量和分散系数等分子量分布特征。开展室内针入度、软化点，粘度和旋转薄膜烘箱老化等实验评价天然沥青改性沥青的路用性能特性。实验结果表明，天然沥青的掺入使改性沥青的分子量在较小分子量M＜1000范围内减小；在中等分子量范围内(1000~6000)增加明显。重均分子量与M＜4000的小分子量组分含量与针入度、软化点和粘度具有良好的线性关系。随着天然沥青掺量的增加，改性沥青的重均分子量和数均分子量逐渐增大，宏观上体现为沥青的高温稳定性得到改善。
위명학리해천연력청개성력청분자량분포특정여력청굉관기술성능지간적련계，채용응효색보방법분석불동참량천연력청개성력청적중균분자량、수균분자량、봉치분자량화분산계수등분자량분포특정。개전실내침입도、연화점，점도화선전박막홍상노화등실험평개천연력청개성력청적로용성능특성。실험결과표명，천연력청적참입사개성력청적분자량재교소분자량M＜1000범위내감소；재중등분자량범위내(1000~6000)증가명현。중균분자량여M＜4000적소분자량조분함량여침입도、연화점화점도구유량호적선성관계。수착천연력청참량적증가，개성력청적중균분자량화수균분자량축점증대，굉관상체현위력청적고온은정성득도개선。
In order to understand the relation between molecular weight distributions and road performance of asphalt modified with natural asphalt,the gel chromatography tests were conducted.The weight-average molec-ular weight,number-average molecular weight,peak molecular weight and distribution ratio were analyzed. The properties of asphalt modified with natural asphalt were evaluated by penetration test,softening point test, viscosity test and aging test.Test results showed that molecular weight decrease in M<1 000 range,and that molecular weight increase in 1 000-6 000 range.There was a good linear relation between the weight-average molecular and road performance.There was a good linear relation between the percentage content of M<4000 and road performance.The additive of natural asphalt increased the high temperature performance of base as-phalt and aging asphalt.