chapter 3 rigid pavement - DOT On-Line Publications - Department ...

FHWA TECHNICAL ADVISORY T 5080.17
July 14, 1994
(2) Wash water can be used
providing the resulting
to make concrete
concrete mix water
meets the followincr
AASHTO M 157:
criteria
-
in Table 2 in
Chemical Limits
Chloride as percent of weight of
cement for the following uses:
prestressed concrete
reinforced concrete in
moist environment
exposed to chlorides
reinforced concrete in
moist environment
not exposed to chlorides
sulfates
alkalis
total solids
0.06
0.10
0.15
3000 ppm
600 ppm
50,000 ppm
(3) If there is any question about the water, it
should be tested using AASHTO T 26.
(4) It should be noted that the American Concrete
Institute (ACI) provides more stringent
tolerances for total chlorides in the mix.
The chloride content for wash water in
AASHTO M 157 is recommended for total
chloride content in AC1 201.2R 22.
d. Admixtures. Admixtures are typically placed in
mixes to improve the quality or performance.
can affect several properties and can have a They
adverse impact on the mix if not used properly.
To avoid possible problems, it is suggested that
trial batches be made to evaluate the mix.
L (1) Air entraining admixtures should be specified
when concrete will be exposed to freeze/thaw
conditions, deicing salt applications, or
sulfate attack. Recommendations for air
content are contained in paragraph 4d.
3.10.5