ASTM D2728-98(2014)

This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: D2728 − 98 (Reapproved 2009) D2728 − 98 (Reapproved 2014)
Standard Practice for
Paving Uses and Application Temperatures for Road Tars
This standard is issued under the fixed designation D2728; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope
1.1 This practice covers the selection and application temperatures of road tar grades in the construction and maintenance of
pavements.
1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
2. Referenced Documents
2.1 ASTM Standards:
D8 Terminology Relating to Materials for Roads and Pavements
3. Terminology
3.1 Definitions:The definitions of terms not included in Terminology D8 are listed below.
3.1.1 dust palliative—a light application of a low-viscosity bituminous material for the express purpose of laying and bonding
dust or preventing a dust nuisance.
3.1.2 plant mix—a mixture of bituminous material and mineral aggregate prepared in a central bituminous mixing plant, then
spread and compacted at the job site. Plant mixes include:
3.1.2.1 cold lay tar concrete—a plant mix containing a medium viscosity grade of tar and a less densely graded aggregate
designed to be laid either shortly after mixing or when the mixture is at or near ambient temperature.
3.1.2.2 hot lay tar concrete—a plant mix containing a high viscosity grade of tar and a densely graded mineral aggregate,
designed to be laid at or near the elevated temperature of mixing.
3.1.2.3 sand mix—a plant mix containing sand aggregate and a high-viscosity grade of tar designed to be laid immediately.
3.1.2.4 soil mix—a plant mix containing soil aggregate and a low-to-medium viscosity grade of bituminous material, usually
designed to be stockpiled, then laid following a period of seasoning.
3.1.3 patch mix—a mixture of bituminous material and mineral aggregate for patching holes, depressions, and distressed areas
in existing pavements. These mixes are suitable for use in relatively small areas, applied at ambient temperature, using hand-laying
and hand-compaction techniques. These mixes may be designed for immediate use or for stock-piling prior to use.
3.1.4 sand aggregate—non-plastic mineral aggregate, essentially all passing the 4.75-mm sieve, and containing no more than
a minor percentage passing the 75-μm sieve.
4. Significance and Use
4.1 This practice provides information on the recommended uses and application temperatures for the various grades of road
tar used in the construction and maintenance of pavements.
5. Recommended Uses
5.1 The recommendations shown in Table 1 are for use only as a guide when using tar for pavement construction and
maintenance. Several grades of tar may be listed in the table for the same general construction procedure. Selection of a particular
grade will depend upon local practice, equipment availability, traffic, and environmental conditions applicable to the specific
project being considered.
This recommended practice is under th
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