subjected to 50 cycles of freezing and thawing.
2.2.1.2
Dimensional Tolerance
The length and width of each block in the sample shall not vary from any
other block in this or any other lot sample by more than 3 mm 1/8 inch.
Thickness of any block in the sample shall not vary by more than 3 mm 1/8
inch from the specified block thickness.
2.2.1.3
Retest
The Contractor shall notify the Contracting Officer if any blocks fail to
meet the specified requirements. In case the shipment fails to conform to
the specified requirements, the Contractor may sort it, and new specimens
shall be selected by the Contractor from the retained lot for retesting, as
directed by the Contracting Officer. All concrete paving block retests
shall be performed at the expense of the Contractor. In case the second
set of specimens fail to conform to the test requirements, the entire lot
shall be rejected.
2.2.2
Sand
The Contractor shall obtain a representative sample in accordance with ASTM
D 75 from each 75 cubic meters 100 cubic yard of sand to be used in the
project. If the sand fails to meet the gradation requirements the
Contractor may take another sample and retest it at his expense. If this
retest fails or if no second test is taken, the sand is rejected by the
Government and shall be removed from the job site.
PART 3
EXECUTION
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NOTE: The base course for the block pavement must
be a dense graded or bound material to avoid loss of
the sands from the bedding layer. It must also be
properly graded and leveled. A smoothness of no
more than 10 mm (3/8 inch) deviation from a 3 m (10
foot) straight edge is needed. The project
specification for the pavement base course should be
checked to ensure these requirements are met.
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3.1
PREPARATION
3.1.1
Edge Restraint Location
The edge restraint shall be placed as shown in the drawings and shall be
installed prior to placement of the blocks.
3.1.2
Sand Bedding Layer
The bedding sand shall be spread evenly over the area to be paved and shall
be screeded to an uncompacted average thickness of 30 mm 1-1/4 inch with a
tolerance for grade and surface smoothness of plus or minus 6 mm 1/4 inches.
This bedding sand shall not be used to fill low areas that exceed the
specified tolerance for the base. The sand shall be left uncompacted and
shall not be disturbed by any pedestrian or vehicle construction traffic.
SECTION 02780
Page 9
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