chapter 3 rigid pavement - DOT On-Line Publications - Department ...
chapter 3 rigid pavement - DOT On-Line Publications - Department ...
chapter 3 rigid pavement - DOT On-Line Publications - Department ...
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FHWA TECHNICAL ADVISORY T 5080.17<br />
July 14, 1994<br />
(3) For 15 to 30 test results the standard<br />
deviation in the above formulas can be<br />
modified by the following factors.<br />
No. of Tests<br />
Modification factor for<br />
standard deviation<br />
Less than 15<br />
15<br />
20<br />
25<br />
30<br />
use table<br />
1.16<br />
1.08<br />
1.03<br />
1.00<br />
for unknown s<br />
e. Air content and slump should be accepted based on<br />
an attribute system, i.e., pass/fail. The<br />
following is a recommended criteria.<br />
Acceptance<br />
criteria<br />
Air content<br />
deviation, %<br />
Slump<br />
deviation,<br />
mm<br />
Acceptable _. .< 1.5 c 25mm<br />
Acceptable 'for<br />
trucks on<br />
the road 1.5 to 2 25 to 31.5mm<br />
_--<br />
Reject >2 > 31.5lnIn<br />
f. Testing procedures for resistance to freeze-thaw<br />
damage, deicing salt attack, and abrasion<br />
resistance are long and involved and do not lend<br />
themselves to testing on a routine basis. These<br />
tests are usually conducted to determine the<br />
durability of the concrete. It should also be<br />
noted that high strength concrete does not always<br />
insure durable concrete.<br />
.- -<br />
Attachments<br />
3.10.23<br />
m- Anthony R. Kane<br />
Associate Administrator<br />
for Program Development
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