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Investigation of Shrink and Swell Factors for Soils Used in FDOT Construction; Final rept
| 题名： | Investigation of Shrink and Swell Factors for Soils Used in FDOT Construction; Final rept |
| 作者： | Chopra, M. B. |
| 关键词： | Highway construction; Soil dynamics; Shrinkage; Swelling; Soil mechanics; Soil density; Soil stability; Compacted soils; Expansive soils; Bulk density; Settlement(Structural); Volume; Cone penetration tests |
| 摘要： | The project investigates these shrinkage and bulkage factors of Florida soils used in earthwork estimation by the Florida Department of Transportation (FDOT). The shrinkage factor indicates the reduction in volume of soil from the borrow pit stage to the final compacted stage, while the bulkage factor accounts for the increase in volume of the soil between the pit and the loose state in the truck. A methodology for predicting these factors is formulated based on density changes of the soil as it is excavated, transported, and compacted. Soil densities at the three different stages are used to calculate shrinkage and bulkage factors, and have been determined from seven field projects throughout the state of Florida. A method is developed to correlate the results of the cone penetration testing (CPT) to in-situ dry density of sandy soils using te uniformity coefficient from grain size analysis. Dilatometer test results are also utilized to estimate the dry density of the soil but are found to over-predict the values in most cases. A unit volume box test is used to simulate the density of a soil while in a loose state, while compacted density values are obtained from the field logs or using standard proctor test in the laboratory. |
| 总页数： | 216p |
| 报告类型： | 科技报告 |
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