Chapter 1: Introduction


Section 1: Guide Overview

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The purpose of this guide is to provide the Texas Department of Transportation (TxDOT), consultant firms, and contractors a detailed pavement overview covering all materials, design, construction and maintenance considerations for traditionally-let TxDOT projects. The guide:

  • serves as an extensive pavement reference that users can browse to look up typical values, methods, practices and resources
  • provides approved policies and procedures for pavement design for use on TxDOT projects
  • provides pavement engineers with a uniform, streamlined process for designing pavements
  • includes a list of available training courses to pavement engineers and links to web-based training for pavement design and analysis programs used by TxDOT
  • serves as a guide to pavement engineers for selecting pavement rehabilitation strategies
  • addresses related topics that a pavement engineer needs such as procedures for changing load zones, superheavy load analysis and pavement forensics.
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Comprehensive Development Agreements

Comprehensive Development Agreements (CDAs) are comprised of contracting methods that include design, construction and maintenance of highways. Under CDAs, there are two major types of projects: concession and non-concession.

Concession projects require a long-term (more than 20 years) maintenance agreement. In this case, performance (ride, rut, distress, etc.) requirements are defined as criteria to be maintained on the project throughout the term of the agreement.

Non-concession projects have a short-term or no maintenance agreements. In this case, design and construction specifications are prescribed for projects.

The scope of this manual includes only traditional TxDOT projects.

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This guide is organized into twelve chapters:

  • Chapter 1, Introduction. This chapter provides an overview of the guide, a list of the training courses related to pavements and highway materials and also provides contacts for pavement and materials related topics.
  • Chapter 2, Pavement Design Process. This chapter provides definitions of pavement types, pavement type selection, the approved methods for pavement design, pavement design categories, pavement design process, information needed for pavement design, and pavement design reports.
  • Chapter 3, Materials Investigation and Selection Information. This chapter covers geotechnical investigations, stabilizations guidelines, aggregate types and classes, performance graded binders (PG binders), asphalt concrete pavement (ACP) mixtures, Portland cement concrete (PCC) and also geosynthetics.
  • Chapter 4, Pavement Evaluation. This chapter provides an overview of pavement evaluation and non-destructive testing for pavements.
  • Chapter 5, Flexible Pavement Design. This chapter provides an overview of the types of flexible pavements, design parameters and typical ranges, pavement detours and widening.
  • Chapter 6, Flexible Pavement Construction. This chapter covers subgrade and base construction, surface preparation, plant operation, mix transport, mix placement, compaction and ride quality.
  • Chapter 7, Flexible Pavement Rehabilitation. This chapter covers the different rehabilitation options for flexible pavements including hot in-place recycling, cold in-place recycling, geosynthetics, flexible base thickening, full depth reclamation, hot mix asphalt (HMA) overlays, whitetopping and surface treatments.
  • Chapter 8, Rigid Pavement Design. This chapter covers the approved pavement design methods for rigid pavements, rigid pavement design process, recommended typical values, thickness determination, concrete paving standards and thin whitetopping.
  • Chapter 9, Rigid Pavement Construction. This chapter covers construction of subgrade and base, surface preparation, concrete mix design, concrete plant operation, delivery of concrete, steel placement, fixed form paving, slip-form paving, joints and texture requirements.
  • Chapter 10, Rigid Pavement Rehabilitation. This chapter covers the different rehabilitation options for rigid pavements including full depth repair, partial depth repair, bonded and unbonded concrete overlays, stitching, dowel bar retrofit, joint repairs, diamond grinding, thin ACP overlays, and retrofitting concrete shoulders.
  • Chapter 11, Forensics. This chapter provides an overview of the Forensic Team, investigation procedures and archiving forensics.
  • Chapter 12, Load Zoning and Super Heavy Load Analysis. This chapter provides an overview of the procedures for changing load zones on highways (including county roads and bridges) and also super heavy load analysis.

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