Instrumenting Ohio Test Pavement

1997 ◽  
Vol 1596 (1) ◽  
pp. 23-30 ◽  
Author(s):  
Shad M. Sargand ◽  
Roger Green ◽  
Issam Khoury
Keyword(s):  
Asphalt Concrete ◽  
Structural Response ◽  
The United States ◽  
Department Of Transportation ◽  
Research Projects ◽  
Portland Cement Concrete ◽  
Cement Concrete ◽  
Delaware County ◽  
Selection Of ◽  
Highway Research

The Ohio Department of Transportation (ODOT) constructed a test pavement on US-23 in Delaware County, Ohio. Of the nine Specific Pavement Studies (SPS) formulated by the Strategic Highway Research Program (SHRP), four (SPS-1, SPS-2, SPS-8, and SPS-9) were included at the OH-SHRP DEL-23 site. Sensors were carefully selected and installed to monitor structural response and seasonal parameters on the basis of prior field experiences accumulated in the United States and Canada. Criteria used to select the sensors were cost, accuracy, sensitivity, longevity, and level of success in previous pavement research projects, especially projects in Ohio. Described here is the development of the Ohio test pavement in terms of objectives, overall instrumentation plan, and selection of sensors as well as typical instrumentation plans for asphalt concrete and portland cement concrete sections.

Implementation Feasibility of Asphalt Concrete–Overlaid Portland Cement Concrete Pavement Rehabilitation Guidelines

1997 ◽  
Vol 1568 (1) ◽  
pp. 155-164
Author(s):  
Kathleen T. Hall ◽  
Amy Schutzbach
Keyword(s):  
Portland Cement ◽  
Asphalt Concrete ◽  
Concrete Pavements ◽  
Remaining Life ◽  
Portland Cement Concrete ◽  
Cement Concrete ◽  
Pavement Rehabilitation ◽  
Cement Concrete Pavement ◽  
Rehabilitation Strategy ◽  
Selection Of

Illinois Highway Research Study IHR-532 was conducted to develop project-level guidelines for evaluation, rehabilitation selection, and rehabilitation design for existing asphalt concrete–overlaid portland cement concrete (AC/PCC) pavements in Illinois. Use of these guidelines depends on data that are not normally available for network-level analysis. A study was conducted to assess the feasibility of implementing these guidelines in network-level decision making and to assess the effects that implementing these guidelines for selection of rehabilitation methods for existing asphalt-overlaid concrete pavements would have on the overall rehabilitation budget requirements for a district network of Interstate pavements, the overall network condition, and pavement network remaining life. These objectives were met by comparing the IHR-532 rehabilitation strategy (which identifies one or more rehabilitation options) with the Illinois Department of Transportation’s current rehabilitation policy, which is an AC overlay thickness of 83 mm (3.25 in.). This feasibility analysis indicated that the selection of the preferred rehabilitation strategy was strongly related to the type and condition of the existing pavement. It also indicated that the IHR-532 rehabilitation strategy and the single rehabilitation strategy yielded similar networkwide results when compared on the basis of average condition at the end of the analysis period. However, the IHR-532 rehabilitation strategy indicated greater benefit than the single rehabilitation strategy, at any budget level, when compared on the basis of network average remaining life at the end of the analysis period.

Vibration Study for Consolidation of Portland Cement Concrete

1997 ◽  
Vol 1574 (1) ◽  
pp. 109-115 ◽  
Author(s):  
Shane Tymkowicz ◽  
Robert F. Steffes
Keyword(s):  
Portland Cement ◽  
The State ◽  
Department Of Transportation ◽  
Portland Cement Concrete ◽  
Cement Concrete ◽  
Research Project ◽  
Air Content ◽  
Radius Of Influence ◽  
Normal Speed

The Iowa Department of Transportation has discovered an increase in the occurrence of excessively vibrated portland cement concrete (PCC) pavements. The overconsolidation of PCC pavements has been observed in several projects across the state. Overconsolidation is also believed to be a factor in acceleration of premature deterioration of at least two pavement projects in Iowa. To address the problem, a research project in 1995 documented the vibratory practices of PCC slipform paving in Iowa in order to determine the effect of vibration on consolidation and air content of pavement. Paver speed, vibrator frequency, and air content relative to the location of the vibrator were studied. The study concluded that the Iowa Department of Transportation specification of 5,000 to 8,000 vibrations per minute (vpm) for slipform pavers is effective for normal paver speeds on the three projects that were examined. Excessive vibration was clearly identified on one project where a vibrator frequency of 12,000 vpm was discovered. When the paver speed was reduced to half the normal speed, hard air contents indicate that excessive vibration was beginning to occur in the localized area immediately surrounding the vibrator at a frequency of 8,000 vpm. The study also indicates that the radius of influence of the vibrators is smaller than has been claimed.

USE OF THE ALTERNATIVE TECHNICAL CONCEPTS IN TRANSPORTATION PROJECTS

2017 ◽  
Vol 4 (1) ◽  
Author(s):  
Ali Touran ◽  
Firooz Panah
Keyword(s):  
The United States ◽  
Department Of Transportation ◽  
Advantages And Disadvantages ◽  
Transportation Projects ◽  
First Case ◽  
Best Value ◽  
Federal Highway ◽  
Design Build ◽  
Request For Proposal ◽  
Selection Of

The use of Alternative Technical Concepts (ATC) is becoming widespread in design-build transportation projects in the United States. According to Federal Highway Administration (FHWA) ATC is a request by a proposer (usually in design-build projects) to modify a contract requirement for gaining competitive advantage over competition. The owner, usually a state department of transportation, requires that the ATC provide a better or at least equal solution to the owner’s design requirements. In Design-Build (DB) projects, the ATC is usually proposed by a proposer during the Request for Proposal (RFP) process and is considered in the evaluation and selection of the proposers in conjunction with the Best Value (BV) method of selection. In this paper, the authors have focused on two case studies involving ATC implementation and negotiations with the Massachusetts Department of Transportation (MassDOT) highlighting advantages and disadvantages of using ATC in DB contracts. In each case, the nature of ATC and the approval process is discussed. In the first case, the approved ATCs provided the proposer with a clear advantage in winning a contract with the agency despite not being the low bidder. In the second case, the proposed and approved ATCs did not result in winning a contract despite being the low bidder.

scholarly journals NON-DESTRUCTIVE EVALUATION OF IN‐PLACE REHABILITATED CONCRETE PAVEMENTS

2010 ◽  
Vol 16 (4) ◽  
pp. 552-560 ◽  
Author(s):  
Kasthurirangan Gopalakrishnan ◽  
Sunghwan Kim ◽  
Halil Ceylan
Keyword(s):  
Field Experiment ◽  
Asphalt Concrete ◽  
Field Evaluation ◽  
Structural Condition ◽  
Concrete Pavements ◽  
Test Results ◽  
Department Of Transportation ◽  
Portland Cement Concrete ◽  
Reflection Cracking ◽  
Non Destructive

Several in‐place rehabilitation techniques have been used before placing an Asphalt Concrete (AC) overlay on Portland Cement Concrete (PCC) pavements in attempts to minimize reflection cracking. Among these techniques, “rubblization” of PCC has been recognized to be the most utilized procedure for the mitigation of reflection cracking in US. This paper presents the practices on the use of rubblization in US and discusses the performance of this technique based on field evaluation. The specifications for the rubblization procedure used by state Department of Transportation (DOT) in US were reviewed. To evaluate the performance of rubblization technique, the structural and the surface conditions of AC overlaid pavements with rubblized PCC layer are compared to those with virgin PCC layer. A series of field experiment tests were carried out on six representative AC overlaid pavements with both rubblized PCC and virgin PCC in Iowa during 2007. The field experiment tests include the Nondestructive (NDT) and destructive tests, and the distress survey. Deflection Basin Parameters (DBPs) were derived from NDT test results to characterize the structural condition of pavements. The results indicate that the rubblized PCC layer has strength comparable to that of virgin PCC layer and has better performance under that structural condition. Santrauka Siekiant nustatyti asfaltbetonio (AC) sluoksnio veiksminguma, mažinant plyšiu ir itrūkiu atsiradima portlandcemenčio betono (NKK) dangose, buvo taikyti keli kelio dangu rekonstrukcijos metodai. Vertinant ivairius plyšiu susidaryma mažinančius keliu rekonstrukcijos metodus, geriausiu buvo pripažintas regeneracijos metodas (PCC rubblization), taikomas JAV. Nagrinejama mineto regeneracijos metodo taikymo patirtis JAV ir analizuojamos jo taikymo galimybes bei veiksmingumas. Ši keliu atnaujinimo metoda taiko JAV Transporto departamentas (DOT). Siekiant ivertinti nagrinejamo regeneracijos metodo veiksminguma eksploatacinemis salygomis, AC buvo padengtas pagal naujaji metoda paruoštu PCC sluoksniu, ir gauti tyrimu rezultatai palyginti su standartiškai paruošto PCC sluoksnio rezultatais. Natūriniai eksperimentiniai bandymai buvo atlikti, taikant neardomuosius (NDT) ir ardomuosius tyrimu metodus. Ilinkiai (DBPs) buvo nustatyti NDT bandymo metodais, charakterizuojančiais konstrukcines dangu salygas. Darbo rezultatai parode, kad pagal naujaji metoda paruoštas PPC sluoksnis igijo panašu stipri kaip ir PCC sluoksnis su standartine danga, tačiau regeneruota PPC danga igijo geresniu eksploataciniu charakteristiku.

Mechanical Properties of Concrete with Ground Waste Tire Rubber

1996 ◽  
Vol 1532 (1) ◽  
pp. 66-72 ◽  
Author(s):  
David Fedroff ◽  
Shuaib Ahmad ◽  
Banu Zeynep Savas
Keyword(s):  
Environmental Problem ◽  
The United States ◽  
Strain Response ◽  
Portland Cement Concrete ◽  
Cement Concrete ◽  
Cylinder Strength ◽  
Hardened Properties ◽  
Waste Tire Rubber ◽  
Stiffness Characteristics ◽  
Strength And Stiffness

Because used tires represent an increasingly serious environmental problem in the United States, this study was undertaken to examine the feasibility of using finely ground rubber in Portland-cement concrete. Various percentages of rubber, by weight of cement, were added to a control mix and the effects on the plastic and hardened properties of concrete were investigated. Workability of the mixes was affected, but it was controllable. For hardened concretes, the tests were conducted for compressive strength, split-cylinder strength, modulus of elasticity, and flexural strength. Stress-strain response was also investigated. The strength and stiffness characteristics were markedly reduced for rubcrete mixtures.

Sign in / Sign up

Export Citation Format

Share Document