A paving asphalt penetration ratio improver was introduced.
介绍了一种提高道路沥青针入度比的改进剂.
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This rubber containing asphalt can be used as paving asphalt for highway and airport.
橡胶沥青适宜于铺筑公路沥青路面和机场道面.
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It'shows that the aging of the paving asphalt is a first order reaction.
结果表明道路沥青老化属于一级动力学反应.
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