Update to AASHTO M 180-18 and Associated Highway Guardrail Specifications Tender

Procurement Summary

Country : USA

Summary : Update to AASHTO M 180-18 and Associated Highway Guardrail Specifications

Deadline : 06 Nov 2018

Other Information

Notice Type : Tender

TOT Ref.No.: 27634672

Document Ref. No. :

Competition : ICB

Financier : Other Funding Agencies

Purchaser Ownership : -

Tender Value : Refer Document

Purchaser's Detail

Purchaser : TRANSPORTATION RESEARCH BOARD
Director, Cooperative Research Programs Transportation Research Board 500 Fifth Street, NW Washington, DC 20001 Attn: Christopher J. Hedges
USA
Email :eharriga@nas.edu

Tender Details

Request for proposals are invited for Update to AASHTO M 180-18 and Associated Highway Guardrail Specifications.

Many states use AASHTO and ASTM standard specifications for their guardrail components. Changes to the state of practice and to guardrail materials have created a need to revise AASHTO Standard Specification M 180-18, Corrugated Sheet Steel Beams for Highway Guardrail, and its associated material standards, including those referenced in M 180-18.

A lack of consistent standards can increase fabrication costs for hardware suppliers and ultimately transportation agencies. A manufacturer can spend a significant amount of resources matching one state-s standards only to start completely over to match another state-s standards. Consistency of specifications will also help to increase competition, allowing for the possibility of lower hardware costs for transportation agencies.

Some examples of developments in materials and the state of practice for highway guardrail systems that are not currently addressed by AASHTO M 180-18 are:

· The asymmetrical W-Beam to thrie-beam transition section that has been in use for a number of years.

· Inconsistency in the material requirements for thrie-beam terminal transitions and connections.

· Use of high-strength steel bolts connecting thrie-beam terminal connectors to rigid barrier.

· Multiple slot patterns for thrie-beam terminal connectors, thrie-beam, and W-beam rails.

· Lack of consistent markings for components of the highway guardrail system.

· Changes to the applicable locations and geometric equivalents for ASTM standard bolts.

· Use of multiple grades for steel posts.

· Lack of guidance for shop-bent W-beam or thrie-beam rails (e.g., longitudinal radius of curve, radius tolerances, marking of beam radius to aid maintenance, etc.).

· Lack of changes to the appropriate dimensions and tolerances (metric and inch) for holes in steel guardrails and posts.

· Lack of inclusion of anchor wire rope standards in AASHTO M 180-18.

· Lack of standards for swage fittings.

· Changes to bolt tolerance, shape, and torque requirements.

· Lack of paint and thermal spray specifications for guardrail beams and posts to meet the requirements for Type III guardrails.

· Implications of the greater longevity of painted weathering steels compared to ordinary carbon steels.

· Need for specifications for stainless steel beams, posts, and bolting to meet the requirements for Type IV guardrails.

Documents

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