Hot Rolled Asphalt and Asphalt Concrete (Macadam) - Ministry of ...

Specification 12 Hot Rolled Asphalt and Macadam for Airfields 9 Summary of Tests
TABLE 9.4 ROUTINE TESTS ON PLANT MIXTURES
Test Test Method Sample
From
Analysis of
the plant
mixtures
BS EN 12697-1
BS EN 12697-2
After the
completion
of the
mixing
process
Minimum
Frequency
Every 4 h
but not less
than twice
a day for
each mixer
in use
Use For Results
Determination of binder contents and
aggregate/filler proportioning and grading –
results plotted on graphs in order to show
comparison with the grading curve of the
mixture approved in accordance with
Clause 8.3 and the relevant binder content
Temperature BS EN 12697-13 Lorry Every load Check for compliance with Clauses 4.6, 5.3
and 7.8
9.5.2 If either the grading or the binder content
of any individual test, out of the total number of
tests for the day’s production of that mixture, fails
to comply with the specified requirements, the
additional tests specified in Clause 9.7 shall be
carried out.
9.6 ROUTINE TESTS DURING LAYING
AND ON COMPACTED COURSES
The Contractor shall undertake the series of tests
on asphalt materials incorporated into the works
necessary to comply with the relevant
specification clauses listed in Table 9.5.
9.7 ADDITIONAL TESTS WHEN
ROUTINE TESTS ON THE
MIXTURES AND ON THE
COMPACTED COURSES FAIL
9.7.1 The Contractor (or his materials supplier
on his behalf) shall carry out the following
additional tests when routine tests fail to establish
the extent to which material already laid fails to
meet the requirements specified for:
• aggregate/filler grading, and binder content;
• course thickness;
• air voids content for Hot Rolled Asphalt;
• percentage refusal density for asphalt
Concrete (Macadam); or
• surface accuracy.
9.7.2 These additional tests (other than for
surface accuracy) shall be made on:
• four 300 mm square samples for checking
grading and binder content;
• four 150 mm diameter cores for checking
course thickness; or
• as specified in Clauses 7.26 and 7.27 for
checking air voids content and percentage
refusal density, respectively.
The samples or cores shall be cut from the
compacted course, at positions selected by the
Project Manager, within the lane width at a
distance of not more than 5 m from the location in
the pavement at which the mixture was laid which
failed to satisfy the routine test requirements
specified.
9.7.3 If any one of the additional test results for
aggregate/filler grading, binder content or course
thickness also indicate failure to meet the
specified requirement, further tests shall be made
on 3 more samples or cores. These samples or
cores shall be cut at further positions selected by
the Project Manager, also within the lane width
and at a distance of not more than 10 m further
along the lane from the location of the previous
failure point. Should one of these additional
samples or cores also fail to meet the specified
requirement, the above process shall be repeated
until all samples or cores are satisfactory. The
area covered by the failed samples of cores shall
be cut out and replaced as detailed in
Clauses 7.29 and 7.30.
9.7.4 When a routine test fails to meet the
requirements of Clause 7.25, an additional
20 straightedge tests in accordance with
BS EN 13036-7 shall be made over the area
between the adjacent points where the routine
test was undertaken for which the results
complied with the requirements of Clause 7.25. If
three or more of these additional tests also fail to
meet the specified requirement, this area of the
surfacing shall be condemned. The condemned
areas shall be removed and replaced by the
Contractor, at his own expense, as specified in
Clauses 7.29 and 7.30.
36 July 2010