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.
2.) Sections 4.1 and 4.1.1 -- to be disregarded as they are solely intended for HMA.
3.) Section 4.2 — replaced in its entirety to read “Test Specimens — specimen length and
width must match Figure | (cutting template), and specimen height must be 0.50 in.
Make and cure the micro-surfacing overlay test specimens using similar methods and
resulting in similar mixture composition and mix consistency as done for the TB 100
(Wet Track Abrasion) and TB 147 (Loaded Wheel Test) specimens.
The water shall be potable and shall be free of harmful soluble salts.
Modifier
Special quick-setting emulsifier agents shall be milled into the asphalt emulsion. The emulsified
asphalt shall be so formulated that when the paving mixture is applied at a thickness of one inch
with the relative humidity at not more than 50% and an ambient air temperature of at least 75
degrees F, the material will cure sufficiently so that rolling traffic can be allowed in one hour
with no damage to the surface, as verified by the Engineer.
Additives
ITEM 404.11 —-MICRO-SURFACING
A. SCOPE
Work shall include all labor, materials, equipment, and transportation required for surface
preparation and placement of a thin overlay (micro-surface) as shown on the plans and as
directed by the Engineer.
B. MATERIALS
Emulsified Asphalt
ITEM 403.12 -HOT BITUMINOUS PAVEMENT, HAND METHOD
A. SCOPE
This work shall include paving using the hand method for areas where it is impractical to pave
using machine method, where shown on the plans, or as ordered by the Engineer.
B. MATERIALS AND CONSTRUCTION
ITEM 403.11 -HOT BITUMINOUS PAVEMENT, MACHINE METHOD
A. SCOPE
This work shall consist of furnishing and placing bituminous pavement including shim pavement
to the depth shown on the plans or ordered by the Engineer.
B. MATERIALS AND CONSTRUCTION
