ETL 1110-l-139
DEPARTMENT OF THE ARMY
CEMP-ET
U.S. Army Corps of Engineers
.
Washington, D.C. 20314-1000
Engineer Technical
22 June 1990
Letter 1110-l-139
Engineering and Design
SELECTING ASPHALT CEMENTS
1. Purpose. This letter updates, guidance for selecting asphalt cements for
pavement construction as outlined in section 6-2 of TM
88-6,
Chapter 9, "Bituminous Pavements Standard Practice".
2. Applicability. This letter is applicable to all HQUSACE elements and
field operating activities (FOA) having Army, Air Force and military and civil
works construction design responsibility.
3. References. The following references provide necessary general informa-
tion, definitions and design guidance for pavements:
a. TM
88-7, Chap. 3.
TM
88-6, Chap. 9.
TM
88-6, Chap. 4.
ASTM D 946.
d.
e. ASTM D 3381.
4. Background. Asphalt cements used in pavement construction are currently
graded or classified on the basis of two different systems: penetration or
viscosity. Within the continental United States
penetration grading
of asphalt cement has been generally replaced by viscosity grading. Outside
the continental United States
penetration grading of asphalt cements
is still common. Because of effects of the grading system change and the
accumulation of many years of pavement performance data based on the penetra-
tion grading system, this letter is needed to provide guidance in selecting
asphalt cements.
5. Action to be Taken. Pending publication of permanent media guidance, the
criteria provided at Enclosures 1 and 2 will be used as an interim for select-
ing asphalt cements. Selection of asphalt cement grades for Army facilities
in cold regions will be coordinated with HQUSACE (CEMP-ET), WASH, DC 20314-
1000. Approval and selection of asphalt cements for Air Force airfields will
be coordinated with the appropriate CEMP-ET mandatory center of expertise.
This ETL supersedes ETL 1110-3-369, 28 March 1986.
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