nature.
2.6.2.4
Job-Mix Formula Submittal
The grout job-mix formula will consist of the following information:
(1) Percentage (by weight) of each mixture ingredient rounded to
the nearest tenth of a percent.
(2) Type and source of portland cement.
(3) Source of fly ash, silica sand, and resin additive.
(4) Marsh Flow Cone viscosity of job-mix-formula grout.
PART 3
EXECUTION
3.1
WEATHER LIMITATIONS
The bituminous mixture shall not be placed upon a wet surface, in rain, or
when the surface temperature of the underlying course is less than l0
degrees C 50 degrees F. Once the bituminous mixture has been placed, and
if rain is imminent, protective materials consisting of rolled polyethylene
sheeting at least 0.l mm 4 mils thick of sufficient length and width to
cover the mixture shall be placed. If the open graded bituminous mixture
becomes saturated, the Contractor shall allow the pavement voids to
thoroughly dry out prior to applying the slurry grout.
3.2
PREPARATION OF OPEN GRADED MIXTURES
Rates of feed of aggregates shall be regulated so that moisture content and
temperature of aggregates will be within tolerances specified. Aggregates
and bitumen shall be conveyed into the mixer in proportionate quantities
required to meet the JMF. Mixing time shall be as required to obtain a
uniform coating of the aggregate with the bituminous material. Temperature
of bitumen at time of mixing shall not exceed 135 degrees C 275 degrees F.
Temperature of aggregate in the mixer shall not exceed 150 degrees C 300
degrees F when bitumen is added. Overheated and carbonized mixtures or
mixtures that foam shall not be used.
3.3
WATER CONTENT OF AGGREGATES
Drying operations shall reduce the water content of mixture to less than
0.75 percent. Water content shall be determined in accordance with ASTM D
2216; weight of sample shall be at least 500 grams. The water content
shall be reported as a percentage of the total mixture.
3.4
STORAGE OF MIXTURE
The open graded bituminous mixture shall not be stored for longer than one
hour prior to hauling to the job site.
3.5
TRANSPORTATION OF MIXTURE
Transportation from the mixing plant to the job site shall be in trucks
having tight, clean, smooth beds lightly coated with an approved releasing
agent to prevent adhesion of mixture to truck bodies. Diesel fuel shall
not be used as a releasing agent. Excessive release agent shall be drained
prior to loading. Each load shall be covered with canvas or other approved
SECTION 02746
Page 18
Previous Page
