Author: Christine M. Reed
Publisher:
ISBN:
Category : Allowance for funds used during construction (Public utilities)
Languages : en
Pages :
Book Description
In the mid-1980s, the Illinois Department of Transportation (IDOT) found itself challenged to maintain an aging highway network at an acceptable level of service on a limited financial base. This made programming rehabilitations for the rural highways difficult under the existing rehabilitation policies. In an effort to minimize the required maintenance effort on these highways as well as maximize the available rehabilitation dollars, IDOT initiated a new single pass, thin lift overlay rehabilitation strategy in 1986. The new rehabilitation strategy was titled Surface Maintenance at the Right Time (SMART). As part of this study, a three-phased performance evaluation was conducted. The first phase of the evaluation focused on the Condition Rating Survey (CRS) values. When the SMART program was established in 1986, it was hoped that the CRS value of a selected project, at least five years after rehabilitation, would be no lower than it was prior to rehabilitation. The methods of analyzing the CRS values included in this study indicated that this standard is being surpassed by a vast majority of the projects. The second phase of the evaluation investigated the riding quality indexes of the SMART projects. Like the CRS values, the analysis of the riding quality indexes indicated the SMART projects are exceeding expectations. The final phase of the evaluation focused on the construction costs of the SMART projects. The construction costs were subject to yearly fluctuations; however, the fluctuations were not excessive. Five years of close monitoring has shown the SMART program to be a viable rehabilitation alternative. This study concludes that the SMART program should be continued under the current guidelines.
The Performance Evaluation of Single Pass Thin Lift Bituminous Overlays
Author: Christine M. Reed
Publisher:
ISBN:
Category : Allowance for funds used during construction (Public utilities)
Languages : en
Pages :
Book Description
In the mid-1980s, the Illinois Department of Transportation (IDOT) found itself challenged to maintain an aging highway network at an acceptable level of service on a limited financial base. This made programming rehabilitations for the rural highways difficult under the existing rehabilitation policies. In an effort to minimize the required maintenance effort on these highways as well as maximize the available rehabilitation dollars, IDOT initiated a new single pass, thin lift overlay rehabilitation strategy in 1986. The new rehabilitation strategy was titled Surface Maintenance at the Right Time (SMART). As part of this study, a three-phased performance evaluation was conducted. The first phase of the evaluation focused on the Condition Rating Survey (CRS) values. When the SMART program was established in 1986, it was hoped that the CRS value of a selected project, at least five years after rehabilitation, would be no lower than it was prior to rehabilitation. The methods of analyzing the CRS values included in this study indicated that this standard is being surpassed by a vast majority of the projects. The second phase of the evaluation investigated the riding quality indexes of the SMART projects. Like the CRS values, the analysis of the riding quality indexes indicated the SMART projects are exceeding expectations. The final phase of the evaluation focused on the construction costs of the SMART projects. The construction costs were subject to yearly fluctuations; however, the fluctuations were not excessive. Five years of close monitoring has shown the SMART program to be a viable rehabilitation alternative. This study concludes that the SMART program should be continued under the current guidelines.
Publisher:
ISBN:
Category : Allowance for funds used during construction (Public utilities)
Languages : en
Pages :
Book Description
In the mid-1980s, the Illinois Department of Transportation (IDOT) found itself challenged to maintain an aging highway network at an acceptable level of service on a limited financial base. This made programming rehabilitations for the rural highways difficult under the existing rehabilitation policies. In an effort to minimize the required maintenance effort on these highways as well as maximize the available rehabilitation dollars, IDOT initiated a new single pass, thin lift overlay rehabilitation strategy in 1986. The new rehabilitation strategy was titled Surface Maintenance at the Right Time (SMART). As part of this study, a three-phased performance evaluation was conducted. The first phase of the evaluation focused on the Condition Rating Survey (CRS) values. When the SMART program was established in 1986, it was hoped that the CRS value of a selected project, at least five years after rehabilitation, would be no lower than it was prior to rehabilitation. The methods of analyzing the CRS values included in this study indicated that this standard is being surpassed by a vast majority of the projects. The second phase of the evaluation investigated the riding quality indexes of the SMART projects. Like the CRS values, the analysis of the riding quality indexes indicated the SMART projects are exceeding expectations. The final phase of the evaluation focused on the construction costs of the SMART projects. The construction costs were subject to yearly fluctuations; however, the fluctuations were not excessive. Five years of close monitoring has shown the SMART program to be a viable rehabilitation alternative. This study concludes that the SMART program should be continued under the current guidelines.
The Performance Evaluation of Single Pass Bituminous Overlays
Author: Christine M. Reed
Publisher:
ISBN:
Category : Pavements
Languages : en
Pages : 32
Book Description
Publisher:
ISBN:
Category : Pavements
Languages : en
Pages : 32
Book Description
FHWA Nationally Coordinated Program of Highway Research, Development, and Technology. Annual Progress Report. Fiscal Year 1992
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 148
Book Description
Publisher:
ISBN:
Category :
Languages : en
Pages : 148
Book Description
FHWA Nationally Coordinated Program of Highway Research, Development, and Technology. Annual Progress Report. Fiscal Year 1993
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 174
Book Description
Publisher:
ISBN:
Category :
Languages : en
Pages : 174
Book Description
Preservation Approaches for High-Traffic-Volume Roadways
Author: David G. Peshkin
Publisher: Transportation Research Board
ISBN: 0309129176
Category :
Languages : en
Pages : 179
Book Description
Publisher: Transportation Research Board
ISBN: 0309129176
Category :
Languages : en
Pages : 179
Book Description
Bituminous Overlay Policy - a Performance Evaluation
Author: Amy M. Schutzbach
Publisher:
ISBN:
Category : Pavements
Languages : en
Pages : 54
Book Description
To address an increasing backlog of roadways in need of rehabilitation, the Illinois Department of Transportation (IDOT) began use of a standard overlay thickness policy in the early 1980's. On the non-interstate, or primary, system, first resurfacing or overlays over pavements being widened and resurfaced were allowed 2.5 inches. Subsequent resurfacing were limited to 2 inches. A provision in the policy allowed for exceptions. This report presents the results of an evaluation of the performance of bituminous overlays constructed on the primary system in accordance with IDOT'S overlay policy. Twelve projects were selected for monitoring. The results of visual surveys, deflection testing, and Condition Rating Survey (CRS) histories were analyzed. The standard overlay thickness policy met the FHWA required minimum 5-year performance period for Federal-aid rehabilitation projects on the primary system. Subsequent overlays were found to have shorter life spans than first overlays. Records of requests for exceptions to the standard overlay thickness policy were also reviewed. Information gathered from the records review was incorporated into the policy and used to create a more efficient process for reviewing requests for exceptions.
Publisher:
ISBN:
Category : Pavements
Languages : en
Pages : 54
Book Description
To address an increasing backlog of roadways in need of rehabilitation, the Illinois Department of Transportation (IDOT) began use of a standard overlay thickness policy in the early 1980's. On the non-interstate, or primary, system, first resurfacing or overlays over pavements being widened and resurfaced were allowed 2.5 inches. Subsequent resurfacing were limited to 2 inches. A provision in the policy allowed for exceptions. This report presents the results of an evaluation of the performance of bituminous overlays constructed on the primary system in accordance with IDOT'S overlay policy. Twelve projects were selected for monitoring. The results of visual surveys, deflection testing, and Condition Rating Survey (CRS) histories were analyzed. The standard overlay thickness policy met the FHWA required minimum 5-year performance period for Federal-aid rehabilitation projects on the primary system. Subsequent overlays were found to have shorter life spans than first overlays. Records of requests for exceptions to the standard overlay thickness policy were also reviewed. Information gathered from the records review was incorporated into the policy and used to create a more efficient process for reviewing requests for exceptions.
Transportation Research Record
Author:
Publisher:
ISBN:
Category : Air travel
Languages : en
Pages : 644
Book Description
Publisher:
ISBN:
Category : Air travel
Languages : en
Pages : 644
Book Description
Design and Performance Evaluation of Very Thin Overlays in Texas
Author:
Publisher:
ISBN:
Category : Asphalt concrete
Languages : en
Pages : 69
Book Description
Very thin overlays 1-inch thick or less were placed as surface layers on five major highways in Texas. These mixes were designed in the laboratory to have a balance of good rut resistance as measured by TxDOTs Hamburg Wheel Tracking test and good reflection cracking resistance as measured by TTIs Overlay Tester. These Crack Attenuating Mixes (CAM) were designed and constructed based on a new special specification SS 3109. In the design phase the optimal asphalt content was initially determined using the Superpave Gyratory Compactor selecting the asphalt content that achieved 98% density after 50 gyrations. This approach worked well with stiff binders and top quality granite aggregates. However design problems were encountered with the transition to softer binders and locally available materials. The researchers proposed an alternative design procedure where the performance tests are run first at a range of asphalt contents and a window defined where both rutting and crack resistance requirements are met. The CAM mixes designed have 100% passing the 3/8-inch sieve and binder contents ranging from 7 to 8.3% asphalt.
Publisher:
ISBN:
Category : Asphalt concrete
Languages : en
Pages : 69
Book Description
Very thin overlays 1-inch thick or less were placed as surface layers on five major highways in Texas. These mixes were designed in the laboratory to have a balance of good rut resistance as measured by TxDOTs Hamburg Wheel Tracking test and good reflection cracking resistance as measured by TTIs Overlay Tester. These Crack Attenuating Mixes (CAM) were designed and constructed based on a new special specification SS 3109. In the design phase the optimal asphalt content was initially determined using the Superpave Gyratory Compactor selecting the asphalt content that achieved 98% density after 50 gyrations. This approach worked well with stiff binders and top quality granite aggregates. However design problems were encountered with the transition to softer binders and locally available materials. The researchers proposed an alternative design procedure where the performance tests are run first at a range of asphalt contents and a window defined where both rutting and crack resistance requirements are met. The CAM mixes designed have 100% passing the 3/8-inch sieve and binder contents ranging from 7 to 8.3% asphalt.
Highway Research Abstracts
Author:
Publisher:
ISBN:
Category : Highway engineering
Languages : en
Pages : 332
Book Description
Publisher:
ISBN:
Category : Highway engineering
Languages : en
Pages : 332
Book Description
Thin Asphalt Overlays in Division VI
Author: Wilson B. Brewer
Publisher:
ISBN:
Category : Low-volume roads
Languages : en
Pages : 130
Book Description
Publisher:
ISBN:
Category : Low-volume roads
Languages : en
Pages : 130
Book Description