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沥青路面加热型密封胶的黏度-温度特征

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Keywords: 道路工程,加热型密封胶,布氏黏度仪,黏流活化能,黏度

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Abstract:

为了评价加热型密封胶的路用性能,分析密封胶施工过程中黏度-温度特征,采用布氏黏度仪,以50%扭矩为黏度的代表值,测试了9种加热型密封胶在160~200℃区间的黏度,并根据黏度-温度试验结果分析了它们的黏流活化能。结果表明,进口密封胶在推荐施工温度的黏度是合适的,而部分国产密封胶在190℃时的黏度过大,容易影响界面黏结能力,从而影响密封胶的路用性能。由于不同密封胶的组分配比存在较大差异,不同密封胶的黏度随温度变化的敏感性存在显著的不同。对于黏流活化能小的材料,黏度对温度的变化更为敏感,施工时更需要注意控制合理的施工温度。根据试验结果,提出了加热型密封胶的施工性能指标。

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