Technical Specifications IFB0660-040617
2017 Pavement Preservation
Revised per Addendum #1
Preparation and Placement of Sealant
No crack sealant material shall be applied in wet cracks or where frost, snow or ice is present, or
when the ambient temperature is below 25 degrees F.
Technical Specifications | IFB0660-040617
2017 Pavement Preservation
Revised per Addendum #1
Tensile Strength (ASTM D2256-90) >70,000 psi
Diameter 0.0008 in. **
Specific Gravity (ASTM D792-91) 1.32 to 1.40
* At temperatures ranging from ambient to maximum finished product mix
temperature
** Subject to Normal Variations
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Technical Specifications iIFB0660-040617
2017 Pavement Preservation
Revised per Addendum #1
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
Technical Specifications IFB0660-040617
2017 Pavement Preservation
Revised per Addendum #1
All materials, labor, equipment, and transportation for the following is considered subsidiary to
this item: mobilization and demobilization, street sweeping, installing and removing plastic on
manhole and service entrances, and tack coat.
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‘ Technical Specifications IFB0660-040617
2017 Pavement Preservation
Revised per Addendum #1
Rolling
If required by the Engineer, specified areas shall be rolled by a self-propelled, 5 to10 ton
pneumatic roller with a tire pressure of 50 PSI and equipped with a water spray system.
H. QUALITY CONTROL
Materials
Technical Specifications IFB0660-040617
2017 Pavement Preservation
Revised per Addendum #1
The surface should be pre-wetted by fogging ahead of the spreader box when required by surface
and ambient conditions. The rate of application of the fog spray shall be adjusted during the day
to suit temperatures, surface texture, humidity, and dryness of the pavement surface.
Technical Specifications IFB0660-040617
2017 Pavement Preservation
Revised per Addendum #1
materials to be used may be acceptable provided they were made during the same calendar year.
The documentation shall include the individual calibration of each material at various settings,
which can be related to the machine metering devices.
E. WEATHER LIMITATIONS
Technical Specifications IFB0660-040617
2017 Pavement Preservation
Revised per Addendum #1
Proportioning Devices
Individual volume or weight controls for proportioning each material to be added to the mix, i.e.,
aggregate, emulsified asphalt, mineral and field control additives, and water shall be provided
and properly marked. These proportioning devices are usually revolution counters or similar
devices, and are used in material calibration and determining the materials output at any time.
Emulsion Pump
Technical Specifications IFB0660-040617
2017 Pavement Preservation
Revised per Addendum #1
Fibers 0.05% to 0.25% by dry weight of aggregate as required to meet the
performance requirements of the TxDOT Overlay Test (Tex-248-
F) as described above
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 + 4.0
#16 45-70 + 4.0
#30 30-50 + 4.0
#50 18-30 + 4.0
#100 10-21 + 4.0
#200 5-15 + 2.0
Technical Specifications IFB0660-040617
2017 Pavement Preservation
Revised per Addendum #1
Fiber-Reinforced Mix Design
Fiber-reinforced mix designs shall be tested for flexibility utilizing the TxDOT Overlay Test
(Tex-248-F) traditionally used for hot mix asphalts (HMA), and adapted for micro-surfacing as
follows:
1.) Section 2.1 -- constant maximum displacement should be increased from 0.025 in. to
0.050 in., 10 seconds (one cycle) to 60 seconds (one cycle).
