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.
Rolling
If required by the Engineer, specified areas shall be rolled by a self-propelled, 5 tol0 ton
pneumatic roller with a tire pressure of 50 PSI and equipped with a water spray system.
H. QUALITY CONTROL
Materials
The contractor will permit the Engineer to take samples of the aggregate and asphalt emulsion to
be used in the project at the Engineer’s discretion. Gradation and sand equivalency tests may be
run on the aggregate, and residual asphalt content test run on the emulsion. Test results will be
compared to 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 the
specifications.
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