Specification: Unit clay paver shall
conform to the requirements of ASTM C1272, Type R, Application PX. The units shall be
standard 4" x 8" (or standard modular) size having dimensions of 21/4" x
4" x 8" (or 21/4" x 3 5/8" x 7 5/8"), ___________edges, 12,500
psi minimum compressive strength and below 6% cold water absorption. Paver color shall
conform to _______________ brick pavers as manufactured by Pine Hall Brick Co., Inc.,
Winston-Salem, North Carolina.
HEAVY DUTY PAVERS- DESIGN GUIDELINES
When to specify heavy duty pavers? In practice, heavy
traffic is thought of as a high frequency of fully loaded tractor-trailers typically found
on a municipal street or road. A more precise definition would say " high volumes of
heavy vehicles representing trucks or combination vehicles having three, four or more
loaded axles with daily equivalent single axle loads (ESAL) of 250 or greater". The
National Stone Association's FLEXIBLE PAVEMENT DESIGN GUIDE FOR ROADS AND STREETS is a
good reference for determining whether your project has heavy vehicular traffic.
If you determine that you have heavy vehicular traffic, you
will need to design your paving system to accommodate the traffic, usually requiring a
thicker, aggregate base equivalent. In your system, you will need to specify a heavy
vehicular paver that meets ASTM C 1272 standards.
There are two types of heavy vehicular pavers, Type R and
Type F. Type R pavers are 2 1/4" thick and are used when the design calls for a rigid
sub-base of concrete or asphalt. Type F pavers are a minimum of 2 5/8" thick and are
used when the design calls for a flexible base of crushed stone. The 2 5/8" thickness
meets the 3 to 1 aspect ratio (thickness to length on a 4" x 8" paver) necessary
to achieve paver interlock under heavy loading.
For a typical residential driveway or a light/medium
traffic commercial job, the added cost of a heavy vehicular design is not necessary and
pavers meeting ASTM C 1272 would not be required. In those applications, pavers meeting
ASTM C 902 would apply.
GENERAL MAINTENANCE & CLEANING
Pine Hall Pavers require no special maintenance as natural
weathering keeps most clay paving systems clean and beautiful.
For specific cleaning situations such as oil stains or moss
removal, there are commercial cleaners available such as StandOff(r) cleaners for paving
products. As a general rule when using these types of cleaners, always test on a small
hidden portion of the pavement; Prewet pavement thoroughly before cleaning and rinse after
with clean water; In mortared applications, pressure washers can be used provided
application pressure is limited to 30-50 psi and a 50 degree fan tip is used. Rinse
pressures should not exceed 200-300 psi. In all cases, DO NOT USE MURIATIC ACID.
For English Edge Rose FR/Rose LR/Buff, Rosewood, Cocoa or Carytown, use VanaTrol (or
equivalent) for mortar cleaning or a detergent cleaner for general cleaning. For
moss removal, a one to one mixture of water and bleach is generally effective. When using
any cleaning solution make sure to follow the label guidelines for application and safety.
In flexible based applications, pressure washers are not
recommended as the pressure washer tends to remove joint sand which compromises interlock.
We suggest using a stiff application brush and a normal pressured garden hose. Loss of
jointing sand may occur over time due to natural exposure. Check annually for sand loss
and re-apply jointing sand as necessary. |
