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In-Place Voids Monitoring of Hot Mix Asphalt Pavements: Follow-Up.
| 题名： | In-Place Voids Monitoring of Hot Mix Asphalt Pavements: Follow-Up. |
| 作者： | Griffin, R. |
| 关键词： | Air Voids; Asphalt Pavements; Asphant Cement; Compaction; Durability; Flexible Pavements; Hot Mix Paving Mixture; Mix Design; Monitoring; Voids In Mineral Aggregate(vma) |
| 摘要： | In order to validate the policy of allowing the adjustment of the asphalt cement to reduce the laboratory air voids up to one percent, cores were taken over a period of four years on 19 paving projects and tested for air voids. After being compacted by traffic over several years, the average air voids in these pavements were 3.8%. Since the design air voids are required to be between 3.5% and 4.5%, the monitoring validates the effectiveness of the policy. However, there was significant scatter in the data with most of the in-place voids falling out of this design range. The asphalt cement adjustment policy has been validated, but more guidance needs to be developed to reduce scatter. CDOT should consider additional guidance in making AC adjustments to achieve more consistent in-place voids. Forensic analysis of any pavement showing premature failure related to mix problems may help in developing and fine-tuning this guidance. |
| 报告类型： | 科技报告 |
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