UFC 3-250-03
15 May 2001
Table 8-5
Slurry Grout Viscosity
Time Elapsed After Mixing
Viscosity
After 0 minutes
7 to 9 seconds
After 15 minutes
8 to 10 seconds
After 30 minutes
9 to 11 seconds
4. EQUIPMENT.
a. General. The equipment used to place, transport, and mix the open-graded asphalt mixture is
generally the same as used to place dense-graded asphalt mixture, except for smaller steel wheel
rollers. This equipment includes sweepers, distributors, pavers, asphalt concrete plants, and transport
trucks. The equipment used to place the cement slurry grout consists of transit trucks, vibratory steel
wheel rollers, and hand tools.
b. Rollers. The rollers used to place the open graded asphalt concrete and the cement slurry grout
are small (3 metric tons (3 tons) maximum) vibratory rollers. These rollers are used in the static mode
only while placing the open-graded asphalt mixture, and in the vibratory mode while placing the cement
grout. When placing the grout, there should be more than one vibratory roller available at the job site in
case of breakdowns.
c. Hand tools. Hand squeegees are used to spread the cement grout over the pavement surface
during application and to remove excess grout from the pavement surface once the grout application is
completed. Hand brooms are used to smooth the texture of the joints during grout application and can
be used to roughen the texture of the entire grouted pavement surface immediately after the grout
application.
5. PLACEMENT.
a. Open-graded asphalt mixture. The open-graded mix is mixed, transported, and placed by the
same methods and procedures used to place dense-graded asphalt mixture. A light tack coat of any
suitable asphaltic material is first applied on the existing asphalt concrete on which the RMP is to be
placed. After placing with a standard asphalt paver, the mixture is not compacted but is rolled to seat or
smooth the surface. This is accomplished with a small (3-metric ton (3 ton) maximum) tandem steel
wheel roller. A vibratory roller of this size may be used provided it is run in the static mode. One to three
passes of the roller is usually sufficient for seating. A similar size roller is also used as a finishing roller
to remove roller marks.
b. Cement slurry grout.
(1) Mixing and transport. The slurry grout can be mixed in a batch plant, portable mixer, or in a
ready-mix truck. The cross polymer resin is added to the mixture after all other ingredients have been
thoroughly mixed. Generally, the cross polymer resin should be added to the grout mixture at the batch
plant if the haul distance is less than 30 minutes. If the haul distance is greater than 30 minutes, the
cross polymer resin should be added to the grout mixture at the jobsite. When using ready-mix trucks
for transporting slurry grout, the grout mixture shall be thoroughly mixed at the jobsite immediately
before application for a minimum of 10 minutes. Thorough mixing is best accomplished by rotating the
8-5
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