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agency will be held prior to construction and will be part of the training program outlined in<br />
Section 4.3. This interaction is critically important for developing the participants’ necessary<br />
understanding of the objectives of the experiment and the need for cooperation in adhering, as<br />
much as possible, to the requirements outlined in this report.<br />
Many of the problems encountered with slurry seal and micro-surfacing can be attributed to<br />
improper placement of the material. These problems include the field conditions at the time of<br />
placement (i.e., wet surface, debris present, and temperature). The LTPP program was able to<br />
use of the same crew and equipment in the SPS-3 studies: HMAC Maintenance Treatments. It<br />
would be preferable for the same crew, equipment, and materials (aggregate and emulsion) to<br />
be used to apply all treatments in this project in order to reduce the impact of variation between<br />
treatment locations. However, due to the extreme effort of mobilizing the same crew and<br />
equipment to each State, this is cost prohibitive.<br />
To account for the variables represented by differing crews and equipment, documentation on<br />
the type of equipment and source of materials is recommended to record the potential impacts<br />
these may have on the performance of the treatment. The project team has provided a plan,<br />
discussed below. Forms to obtain data on the lay down procedures are provided in Appendix<br />
G.<br />
5.4.3.1 Pre-Construction<br />
All cracks that are greater than 0.25 inches wide (6 mm) should be sealed prior to application of<br />
the treatment. It is not anticipated that patching will be required because of the pre-qualifying<br />
condition of the test sites. If patching is required, it must be performed prior to the distress<br />
survey. The site conditions prior to construction will be recorded and will include the following:<br />
• Pavement Distress using the LTPP DIM(2)<br />
• Type of Surface Material and Construction History (age)<br />
• ADT and Percent Trucks<br />
• Climate<br />
• QA Procedures Developed in Task 1<br />
• Calibration of Equipment<br />
Prior to construction, the pavement must be in a dry condition and free of debris.<br />
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