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对3种中国基质沥青和1种进口基质沥青进行旋转薄膜加热试验(RTFOT),测试了试验前后沥青的各项性能指标。利用加权密切值法将沥青老化前后质量损失、残留针入度比、残留延度比、软化点增量、粘度比和老化指数等6项评价指标转化为最优密切值这一单项评价指标,同时考虑了各指标的可靠性和有效性的不同,并赋予不同的权重值。试验结果表明:该方法有效克服了采用多种评价指标得到不一致甚至相互矛盾的结果的缺点;评价过程简便易行,评价结果与验证试验结果具有良好的一致性,是选出抗老化性能较好的沥青的一种有效方法。
The rotary film heating test (RTFOT) of three kinds of Chinese base asphalt and one kind of imported base asphalt was carried out, and the performance indexes of asphalt before and after the test were tested. The weighted close value method was used to convert the six evaluation indexes such as mass loss, residual penetration ratio, residual ductility ratio, increment of softening point, viscosity ratio and aging index into the best close value before and after asphalt aging, At the same time, the reliability and validity of each index are considered, and different weight values are given. The experimental results show that this method can effectively overcome the shortcomings that inconsistent or even contradictory results are obtained by using a variety of evaluation indexes. The evaluation process is simple and easy, and the evaluation results are in good agreement with the verification test results, thus the better aging resistance is selected An effective method of asphalt.