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6.2 STOCKPILE AND STORAGE.<br />
If the mineral aggregates are stored or stockpiled, they must be handled in a manner that will<br />
prevent segregation and contamination. The aggregate will be accepted at the job site stockpile<br />
or when loading into the units for delivery to the laydown machine. The stockpile shall be<br />
accepted based on five gradation tests according to AASHTO T-2. If the average of five tests is<br />
within the gradation tolerances, the materials will be accepted. If the test results indicate that<br />
the material is outside the gradation limits, the material will be removed from the stockpile site or<br />
blended with other aggregate from the stockpile to achieve an acceptable product. Materials<br />
used for blending shall meet the requirements of Table 6.3 and shall be blended in an<br />
acceptable manner to assure a consistent product. Blending will require a new mix design.<br />
The aggregate shall be passed over a 3/8 inch (9.5-mm) scalping screen prior to transfer to the<br />
laydown machine to remove oversize material.<br />
6.2.1 WATER AND ADDITIVES.<br />
Water shall be potable and free from harmful soluble salts or other contaminants.<br />
The slurry surfacing mixture shall be homogeneous during and following mixing and spreading<br />
and possess sufficient stability to prevent premature breaking in the spreading equipment.<br />
Additives may be added to the emulsion mix or any of the component materials to provide<br />
control of the setting characteristics of the mixture. They must be included as part of the mix<br />
design and be compatible with the other components of the mix.<br />
6.2.2 MINERAL FILLER.<br />
Mineral filler may be used in the mixture and shall be introduced into the mineral aggregate and<br />
shall be an approved brand of non-air entrained Portland cement or hydrated lime that is free<br />
from lumps. Visual inspection and supplier certification are required. The amount of mineral<br />
filler to be added shall be part of the mix design process and shall be considered as part of the<br />
aggregate gradation. If additional consistency is required during the placement of the mixture, a<br />
+/- one percent change in mineral filler will be permitted without requiring a new mix design.<br />
6.3 PAVING MIXTURE<br />
Prior to the beginning of work, the contractor shall submit a proposed mix design for approval to<br />
the contracting agency. A laboratory capable of performing the tests that are noted in Table 6.4<br />
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