NOTE: Sand provides both a protective surface when
installed to the recommended depth and play value as
in deep digging. When selecting sand, the
composition of fine to coarse particles becomes a
factor as sand compresses from rainfall. Compressed
sand no longer meets impact attenuation for the fall
height specified. Also, sand is displaced from
running, digging or dragging activities, requiring
replenishment on a daily basis to maintain impact
attenuation performance. "Uniformly graded" sand is
to be specified as it has less tendency to compact
than "well graded" sand. The specified sieve sizes
provide a range of passing percentages that meet
paragraph CHILD SAFETY requirements. The range of
sieve sizes provided give a sand composition that is
locally available and reduce custom mixing.
In accordance with the US Army Community and Family
Support Center (CFSC-FSCY) requirements for the Army
developmental play program, sand is a required play
element and shall not be eliminated from the play
area.
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Sand shall be uniformly graded, washed, free of dust, clay, dirt, hazardous
substances, or foreign objects. Sand particles shall be rounded naturally
or by mechanical means and sieved in accordance with ASTM C 136 to be in
the following gradation range.
SIEVE SIZE
PERCENT PASSING
2.36 mm
100 percent
1.18 mm
80-100 percent
0.6 mm
40-75 percent
0.3 mm
0-25 percent
0.15 mm
less than 2 percent
SIEVE SIZE
PERCENT PASSING
#8
100 percent
#16
80-100 percent
#30
40 - 75 percent
#50
0-25 percent
#100
less than 2 percent
2.3.2
Gravel
Gravel shall be washed, free of dust, clay, dirt, hazardous substances or
foreign objects. Gravel particles shall be rounded naturally or by
mechanical means and sieved in accordance with ASTM C 136 to be in the
following gradation range.
SECTION 02791
Page 16
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