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Design and Evaluation of Foamed Asphalt Base Materials.
| 题名： | Design and Evaluation of Foamed Asphalt Base Materials. |
| 作者： | Khosravifar, S.; Schwartz, C. W. |
| 关键词： | Additives; Base Courses; Bitumens; Calcium Oxides; Cycles; Durability; Foamed Asphalt; Freezing; Melting; Mixtures; Pavement Bases; Soaking; Stability; Stabilization; Waste Recycling |
| 摘要： | Foamed asphalt stabilized base (FASB) combines reclaimed asphalt pavement (RAP), recycled concrete (RC), and/or graded aggregate base (GAB) with a foamed asphalt binder to produce a partially stabilized base material. The objectives of this study are to determine for Maryland conditions: (a) FASB mix design procedures; (b) typical engineering and structural design properties; (c) guidelines for FASB production and placement; and (d) best practices for construction quality assurance. The study consisted of three major components: (a) laboratory evaluation of FASB mix design procedures; (b) field evaluation of in-place FASB stiffness, and especially the increase in this stiffness with time due to curing; and (c) direct laboratory measurement of the performance related properties of FASB, specifically dynamic modulus and permanent deformation resistance. Recommended default design values for resilient modulus and structural layer coefficient are 300 400 ksi and 0.30 0.35, respectively. The study findings also provided guidance for the development of draft specifications. |
| 报告类型： | 科技报告 |
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