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.
The micro-surfacing mixture shall be of the desired consistency upon leaving the mixer and no
additional materials should be added. A sufficient amount of material shall be carried in all parts
of the spreader at all times so that a complete coverage is obtained. Overloading of the spreader
shall be avoided. No lumping, balling, or unmixed aggregate shall be permitted.
No streaks, such as those caused by oversized aggregate, will be left in the finished surface. If
excessive amounts of oversized aggregates appear in the mix, the job will be stopped until the
contractor proves to the Engineer that the situation has been corrected.
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
The micro-surfacing mixture shall possess sufficient stability so that premature breaking of the
material in the spreader box does not occur. The mixture shall be homogeneous during and
following mixing and spreading. It shall be free of excess water or emulsion, and free of
segregation of the emulsion and aggregate fines from the coarser aggregate.
Hand Work
Areas which cannot be reached with the mixing machine shall be surfaced using hand squeegees
to provide complete and uniform coverage. The area to be hand-worked shall be lightly
dampened prior to mix placement. Care shall be exercised to leave no unsightly appearance
from handwork.
The same type finish as applied by the spreader box shall be required. Handwork shall be
completed immediately after the micro-surfacing mixture is discharged from the spreader box.
Lines
Care shall be taken to insure straight lines along curbs and shoulders. No runoff on these areas
will be permitted. Lines at intersections will be kept straight to provide a neat workmanship
appearance.
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