Category Archives: AASHTO

AASHTO CHBTW-2

Construction Handbook for Bridge Temporary Works, 2nd Edition

Published by: 2017-01-01 / 2017-01-01 / 156 pages
This handbook has been developed for use by contractors and construction engineers involved in bridge construction. This document may also be of interest to falsework design engineers, and supplements information found in the Guide Design Specifications for Bridge Temporary Works. The content is construction-oriented, focusing primarily on standards of material quality and means and methods of construction. The handbook contains chapters on falsework, formwork, and temporary retaining structures.

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AASHTO PH06-2

Practitioner’s Handbook #6: Consulting under Section 106 of the National Preservation Act

Published by: 2016-08-01 / 2016-08-01 / 27 pages
This handbook provides recommendations for complying with Section 106 of the National Historic Preservation Act during the environmental review process for transportation projects. Practical tips addressed include: agency roles, State specific requirements, consulting parties and public involvement, areas of potential effects, evaluation of eligibility for the National Register of Historic Places, evaluation of effects on Historical Properties, documentation of eligibility and effects, resolution of adverse effects, coordination with other requirements, alternative methods for Section 106 compliance, and memorandum of agreement.

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AASHTO PH01-2

Practitioner’s Handbook #1: Maintaining a Project File and Preparing an Administrative Record for a NEPA Study

Published by: 2016-08-01 / 2016-08-01 / 17 pages
Preparing the administrative record for a complex project can be a major challenge. This handbook provides a starting point for undertaking this important task. Practical tips addressed include maintaining accurate project files during the NEPA study, using the NEPA process to build a strong administrative record, reviewing project files and compiling the administrative record, deciding what documents to include in the administrative record, and submitting the administrative record to the court.

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AASHTO PH12-2

Practitioner’s Handbook #12: Assessing Indirect Effects and Cumulative Impacts Under NEPA

Published by: 2016-08-01 / 2016-08-01 / 24 pages
This handbook is intended to assist practitioners in assessing indirect effects and cumulative impacts in the evaluation of transportation projects under the National Environmental Policy Act (NEPA). Issues covered in this handbook include: Understanding the definitions of direct effects, indirect effects, and cumulative impacts; gathering the information needed for the analysis; deciding the appropriate scope and level of detail; carrying out the analysis; identifying mitigation opportunities; documenting the analysis; and using the transportation planning process to support NEPA-level studies of indirect effects and cumulative impacts.

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AASHTO PH14-2

Practitioner’s Handbook #14: Applying the Section 404(b)(1) Guidelines in Transportation Project Decision-Making

Published by: 2016-08-01 / 2016-08-01 / 26 pages
This handbook is intended to assist practitioners in applying the Section 404(b)(1) Guidelines in the environmental review process for surface transportation projects. It focuses on highway and transit projects that require an individual Section 404 permit under the Clean Water Act and involve preparation of an environmental impact statement or environmental assessment under the National Environmental Policy Act.

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AASHTO PH02-2

Practitioner’s Handbook #2: Responding to Comments on an Environmental Impact Statement

Published by: 2016-08-01 / 2016-08-01 / 13 pages
This handbook provided information on responding to comments on an environmental impact statement (EIS) under the National Environmental Policy Act (NEPA). This handbook provides information for developing responses to comments on both a Draft EIS and Final EIS, and covers the issues associated with responding to comments on an Environmental Assessment (EA). Key issues to consider when responding to comments on an EIS include inviting comments, receiving and sorting comments, reviewing and responding to comments, and responding to FEIS comments. Practical tips addressed include inviting comments, receiving and sorting comments, developing responses to comments, ensuring accuracy and consistency, and formats for presenting DEIS comments and responses in the FEIS.

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AASHTO PH03-2

Practitioner’s Handbook #3: Managing the NEPA Process for Toll Lanes and Toll Roads

Published by: 2016-08-01 / 2016-08-01 / 17 pages
Conducting National Environmental Policy Act (NEPA) studies for projects involving toll lanes and toll roads involves many sensitive issues and complex considerations. Key issues to consider when managing the NEPA process for toll lanes and toll roads include transportation plans and policies, proposed tolling concept, scope of NEPA analysis, relationship of NEPA process to project financing, and procurement and legal issues. Practical tips addressed include laying the policy foundation, building the project team, developing tolling alternatives, framing the issues for decision in the NEPA process, modeling the performance of tolled alternatives, evaluating impacts of tolled alternatives, synchronizing the NEPA review with procurement process, and considering tolling after NEPA is under way or completed.

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AASHTO PH07-2

Practitioner’s Handbook #7: Defining the Purpose and Need, and Determining the Range of Alternatives for Transportation Projects

Published by: 2016-08-01 / 2016-08-01 / 18 pages
This handbook provides recommendations on defining a project’s purpose and need in accordance with the National Environmental Policy Act (NEPA) and determining a range of alternatives. Practical tips include understanding the legislative and planning context, determining the needs, defining the project purpose, screening alternatives, and involving agencies and the public.

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AASHTO T 90-16

Standard Method of Test for Determining the Plastic Limit and Plasticity Index of Soils

Published by: 2016-01-01 / 2016-01-01 / 6 pages
The plastic limit of a soil is the lowest water content determined in accordance with this procedure at which the soil remains plastic. The plasticity index of a soil is the range in water content, expressed as a percentage of the mass of the oven-dried soil, within which the material is in a plastic state. It is the numerical difference between the liquid limit and plastic limit of the soil.

The following applies to all specified limits in this standard: For the purpose of determining conformance with these specifications, an observed value or a calculated value shall be rounded off “to the nearest unit” in the last right-hand place of figures used in expressing the limiting value, in accordance with ASTM E 29.

Two procedures for rolling out soil samples are provided in this method: the Hand Rolling Method and the Plastic Limit Device Method. The Hand Rolling Method shall be used as the referee procedure.

This test method is often conducted in conjunction with T 89, which is used to determine the liquid limit of soils.

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AASHTO TP 122-16

Provisional Standard Method of Test for Determination of Performance Grade of Physically Aged Asphalt Binder Using Extended Bending Beam Rheometer (BBR) Method

Published by: 2016-01-01 / 2016-01-01 / 9 pages
This test method covers the determination of the low-temperature performance grade (i.e., minimum design pavement temperature) of asphalt binders by means of a bending beam rheometer after going through a physical aging (physical hardening) process. It is applicable to material having a flexural stiffness value from 20 MPa to 1 GPa (creep compliance values in the range of 50 nPa-1 to 1 nPa-1) and can be used with material aged using T 240 (RTFO) or R 28 (PAV) or with recovered asphalt binder. The test apparatus is designed for testing within the temperature range from -36 to 0°C.

The bending beam rheometer method used in T 313 conditions samples for 1 h and tests at a temperature 10°C warmer than the low-temperature performance grade to determine if the asphalt binder passes the low-temperature requirement. This standard requires testing at two temperatures, to determine by extrapolation a limiting temperature for each of the three conditioning times and two conditioning temperatures.

Low-temperature physical aging of asphalt varies as a function of temperature and time. This standard conditions at 10°C and 20°C warmer than the low-temperature performance grade for periods of 1 h, 24 h, and 72 h to simulate the effect of extended conditioning at two different cold temperatures.

Test results are not valid for beams of asphalt binder that deflect more than 4 mm or less than 0.08 mm when tested in accordance with this method.

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