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This research project covered a wide range of activities that allowed researchers to understand the relationship between stability, pavement distress, and recycled portland cement concrete (RPCC) subbase aggregate materials. Detailed laboratory and field tests, including pavement distress surveys, were conducted at 26 sites in Iowa. Findings show that specific gravities of RPCC are lower than those of crushed limestone. RPCC aggregate material varies from poorly or well-graded sand to gravel. A modified Micro-Deval test procedure showed that abrasion losses of virgin aggregate materials were within the maximum Micro-Deval abrasion loss of 30% recommended by ASTM D6028-06. Micro-Deval abrasion loss of RPCC aggregate materials, however were much higher than those of virgin materials and exceeded 30% loss. Modulus of elasticity of RPCC subbase materials is high but variable. RPCC subbase layers normally have low permeability. The pavement surfaces for both virgin and RPCC subbase across Iowa were evaluated to fulfill the objectives of this study related to field evaluation. Visual distress surveys were conducted to gather the detailed current pavement condition information including the type, extent, and severity of the pavement distresses. The historical pavement condition information for the surveyed field sections was extracted from the Iowa DOT's Pavement Management Information System (PMIS). The current surface condition of existing field pavements with RPCC subbase was compared with the virgin aggregate subbase sections using two different approaches. The changes in pavement condition indices (PCI and IRI) with time for both types of pavements (subbases) were compared.
Paper 1: This study covers a condition survey in Indiana of 328.5 mi. of rigid pavements constructed with granular bases. Paper 2: All new concrete pavement in Illinois has been placed on granular subbase where the natural soil is fine-grained and heavy truck traffic is expected. The lower cost of constructing the trenched undrained subbase was a deciding factor in the preference shown for this type of subbase.
SUMMARY This book provides complete coverage of surface and subsurface drainage of all types of pavements for highways, urban roads, parking lots, airports, and container terminals. It provides up-to-date information on the principles and technologies for designing and building drainage systems and examines numerous issues, including maintenance and designing for flood events. Practical considerations and sophisticated analysis, such the use of the finite element method and unsaturated soil mechanics, anisotropy and uncertainties, are presented. This book allows civil engineers to make the best use of their resources to provide cost effective and sustainable pavements. Features Presents a holistic consideration of drainage with respect to pavement performance. Includes numerous practical case studies. Examines flooding and the impacts of climate change. Includes PowerPoint slides which include quizzes, schematics, figures, and tables.
This project is a continuation of the research done from 1972 to 1981 on a jointed portland cement concrete pavement test section located in the southbound lane of Ohio Route 23 in Chillicothe, Ohio. Several variables were incorporated into the pavement: joint spacing, type of base, type of dowels and type of sawcut. Short term and long term horizontal movements caused by temperature were evaluated over a two year period. Vertical movements under known axle loads were also determined. Dynaflect and FWD were measured at the same time as the vertical movements. A statistical analysis was conducted of the horizontal and vertical movement data. A record of the damage to the pavement during the 20 year span was also made.