Foamed Warm Mix Asphalt Design Issues
| 项目名称： | Foamed Warm Mix Asphalt Design Issues |
| 摘要： | Warm Mix Asphalt (WMA) has quickly become a popular topic in the asphalt industry, and the Federal Highway Administration (FHWA) is actively encouraging implementation of WMA in all states. While a fair assessment plan has been developed with regard to mix design for WMA technologies using additives (TRC-1004), a number of questions remain as to the most appropriate method for assessing plant-foamed WMA. There are currently three devices available for simulating the plant-foaming technique in the laboratory, though no data is yet available to determine whether these devices provide a suitable representation of field produced mixtures. Data from Project TRC-1004 suggests that a WMA design should not be developed by simply altering a Hot Mix Asphalt (HMA) design by 'plugging in' a WMA additive. Thus, it is reasonable that the same would be true of the plant-foaming techniques. The Arkansas Highway and Transportation Department (AHTD) does not currently have a laboratory foamer, and as a result, has no mechanism for approving WMA mix designs that are intended to be generated by a plant-foaming technique. However, the majority of warm mix in Arkansas is produced using a plant-foaming technique. The results of the recently completed NCHRP project 9-43 indicate that a laboratory foamer is necessary for all WMA mix designs that will utilize plant-foaming techniques. In addition, recommendations have been made to append AASHTO R35 to require a laboratory foamer for the design of such mixes. Thus, an evaluation is necessary to determine how a laboratory foamer could or should be used for the purpose of WMA mix design approval in Arkansas. Additional investigations of WMA and RAP/RAS combinations in laboratory-foamed mixes will also be studied. |
| 状态： | Completed |
| 资金： | 343626.00 |
| 资助组织： | Federal Highway Administration |
| 项目负责人： | Tamayo, Sarah A |
| 执行机构： | University of Arkansas, Fayetteville |
| 开始时间： | 20120701 |
| 实际结束时间： | 20140630 |
| 主题领域： | Design；Highways；Maintenance and Preservation；Pavements；I30: Materials |
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