UFC 3-260-02
30 June 2001
environment with abundant sulfates in the soils and water. The recycled concrete suffered from sulfate
attack causing heaving of the overlying surfaces. This occurred even though the recycled concrete
came from nearby airfield pavements that were built to be sulfate resistant and had existed in the same
environment for 30 years without problem. Reliable guidance on use of recycled concrete to be exposed
to sulfate exposure is not available, and HQUSACE (CEMP-ET), appropriate Air Force MAJCOM
pavements engineer, or Naval Facilities Engineering Service Center should be consulted for guidance if
recycled concrete is to be exposed to sulfates. As a general policy, the military encourages use of
recycled materials in airfield pavements, but this should not be done at the expense of quality or
performance of the final pavement. More extensive guidance and specific limitations used by each
service can be found in TM 5-822-14/AFJMAN 32-1019, TI 822-08/AFMAN 32-1131 V8(1)/DM 21.11,
and TM 5-822-7/AFM 88-6, Chapter 8, and each service's guide specifications.
Table 9-1
Types of Portland Cement
Type of Cement
Characteristics
I
Ordinary
II
Moderate sulfate resistant
I/II
Meets ASTM C 150 for both Type I and II cements
III
High, early strength
IV
Low heat of hydration
V
Sulfate resistant for more severe sulfate exposure conditions
9-16
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