ITEM 604.4 - REPAIR OF EXISTING STRUCTURES
A. SCOPE
This work consists of repairing existing structures below 12” from the bottom of existing casting
frame.
B. MATERIALS AND CONSTRUCTION
The contractor shall include all labor, materials, equipment, and transportation necessary to
repair existing structures other than within the top 12 inches below the bottom of casting frame.
Repairs in that section shall not be paid under this item.
" 8% polyester reinforcing fibers
Preparation and Placement of Sealant
No crack sealant material shall be applied in wet cracks or where frost, snow or ice is present,
nor when the ambient temperature is below 25 degrees F.
* At temperatures ranging from ambient to maximum finished product mix
temperature
** Subject to Normal Variations
The modified asphalt-fiber compound shall be mixed at a rate of 8% fiber weight to weight of
asphalt cement. This compound having the same chemical base provides compatibility and
exhibits excellent bond strengths. The fiber functions to re-distribute high stress and strain
concentrations that are imposed on the sealant by thermal sources, traffic loading, etc.
C. EQUIPMENT
ITEM 405.11 - CRACK SEALING
A. SCOPE
The work covered by this section of the specification consists of furnishing all materials, labor,
transportation, and equipment necessary to perform all operations in connection with the
cleaning and sealing of construction and random cracks in bituminous concrete pavements,
including vegetation removal and sterilization of cracks, where necessary.
B. MATERIAL
Micro-Surfacing Mixture
Samples of the mixture should be taken daily and may be taken directly from the mixing unit(s).
Consistency and residual asphalt content tests may be made on the samples and compared to the
specifications. Tests will be run by a qualified laboratory at the expense of the Owner. The
Owner must notify the contractor immediately if any test fails to meet specifications.
Joints
No excessive buildup, uncovered areas or unsightly appearances shall be permitted on
longitudinal or transverse joints. The contractor shall provide suitable width spreading
equipment to produce a minimum number of longitudinal joints throughout the project. When
possible, longitudinal joints shall be placed on lane lines. Half passes and odd width passes will
be used only in minimum amounts. If half passes are used, they shall not be the last pass of any
paved areas.
Mix Stability
F. SURFACE PREPARATION
General
The area to be resurfaced shall be thoroughly cleaned of vegetation, loose aggregate and soil,
particularly soil that is bound to the surface. Manholes, valve boxes and other service entrances
will be protected from the surfacing material with polyethylene sheeting. All services will be
uncovered upon completion of work.
Cracks in Surface
Emulsion Pump
The emulsion pump shall be a heated, positive displacement type pump.
Spreading Equipment
Aggregate - Recommended Gradations:
Type II Production
Screen Size % Passing Tolerance
3/8” 100 +7.0/+7.0
#4 90-100 + 7.0
#8 65-90 +40
#16 45-70 +40
#30 30-50 +40
#50 18-30 +40
#100 10-21 +40
#200 5-15 +2.0
Suggested Application Rates:
Type II - Urban and Residential Streets and Airport Runways:
single course = 18-20 lbs//s.y.
double course = 28-32 Ibs./s.y.
Note: all application rates above are dry aggregate weights exclusive of emulsion and all other
additives.
