ASTM D2628-25 PDF

Full title and description

ASTM D2628-25 — Standard Specification for Preformed Polychloroprene Elastomeric Joint Seals for Concrete Pavements. This specification defines material and physical property requirements for preformed polychloroprene (chloroprene rubber) multiple‑web elastomeric joint seals intended for use in concrete pavement joints; seals are vulcanized, installed with a lubricant, and function by compression between joint faces to exclude incompressibles and provide a durable seal.

Abstract

This standard covers manufacturing and purchasing requirements for preformed polychloroprene elastomeric joint seals with a multiple‑web design for concrete pavements. Required material properties include minimum tensile strength and elongation, specified hardness, resistance to oven aging and oil swell, ozone resistance, low‑temperature behavior (stiffening and recovery), and compression deflection performance. The document is a material/specification standard and does not prescribe selection of size or installation procedures beyond noting installation with a lubricant.

General information

• Status: Active.
• Publication date: January 11, 2025 (designation D2628‑25).
• Publisher: ASTM International.
• ICS / categories: Road construction / pavement materials (ICS code commonly associated: 93.080.10 — road construction).
• Edition / version: D2628‑25 (2025 edition).
• Number of pages: 3 pages.

Scope

The scope covers material requirements for preformed polychloroprene elastomeric joint seals for concrete pavements that rely on compression sealing and a multiple‑web cross section. It addresses the required composition (polychloroprene as the sole base polymer), vulcanization, and the physical property limits and test methods used to verify performance; it does not specify joint size selection, installation technique beyond use of lubricant, or project‑level design decisions. The standard provides inch‑pound units as the standard and optional SI conversions for information.

Key topics and requirements

• Material: vulcanized elastomeric compound using polychloroprene (chloroprene) as the only base polymer.
• Design: preformed, multiple‑web cross section that folds inward at the top to facilitate compression sealing.
• Performance properties: tensile strength, elongation at break, Type A durometer hardness, oven aging (heat resistance), oil swell limits, ozone crack resistance, low‑temperature stiffening and recovery, and compression deflection.
• Testing: references to established ASTM test methods for rubber properties (for example D412, D2240, D573, D471, D1149 and related methods are used to assess the specified properties).
• Application note: manufactured as a purchasing/specification document—proper selection of size, cross section, and careful installation are critical for field performance but are outside the technical requirements of this specification.

Typical use and users

Common users include DOTs/highway agencies, pavement design engineers, specification writers, manufacturers and suppliers of joint seals, precast concrete and pavement contractors, and materials testing laboratories. Typical applications are expansion and contraction joints in concrete pavements on roads, bridges, and airfields where a durable elastomeric compression seal is required.

Related standards

This specification references and relies on multiple ASTM test methods for rubber and elastomer evaluation, including (but not limited to) D412 (tensile), D2240 (durometer hardness), D573 (rubber oven aging), D471 (oil swell), and D1149 (ozone resistance). It also sits alongside other pavement and sealing system standards and product specifications for joint fillers, sealants, and installation practices used by agencies.

Keywords

preformed joint seal, polychloroprene, chloroprene rubber, elastomeric joint seal, concrete pavement, compression seal, multiple‑web seal, ASTM D2628, pavement joint materials, rubber physical properties.

FAQ

Q: What is this standard?

A: ASTM D2628‑25 is a material specification that sets requirements for preformed polychloroprene elastomeric joint seals used in concrete pavements, specifying composition and measurable physical properties for acceptance.

Q: What does it cover?

A: It covers material composition (polychloroprene as the base polymer), vulcanization, cross‑section design (multiple web), required physical properties (tensile, elongation, hardness, oil swell, ozone resistance, low‑temperature behavior, compression deflection), and the test methods to verify those properties; it is not an installation or sizing guide.

Q: Who typically uses it?

A: Highway and transportation agencies, pavement/materials engineers, contractors, product manufacturers and suppliers, and testing laboratories use the standard to specify, produce, or verify joint seal materials for concrete pavement projects.

Q: Is it current or superseded?

A: The 2025 edition is published as D2628‑25 and replaces earlier reapproved editions (historical versions include D2628‑91 and later reapprovals); the current designation is D2628‑25 and is listed as active. Note: agencies should confirm adoption or amendment status with ASTM or their national standards body for contract use.

Q: Is it part of a series?

A: D2628 is a standalone material/specification within ASTM’s pavement and elastomer testing framework but references a number of ASTM test methods and sits among other pavement and sealing standards commonly used together in project specifications.

Q: What are the key keywords?

A: Key keywords include preformed joint seal, polychloroprene, elastomeric, compression seal, concrete pavement, ASTM D2628.