1109 - AGGREGATE FOR MICROSURFACING 1100-27
1109.1 Description
This specification covers aggregates for use in microsurfacing operations.
1109.2 Requirements
a. Composition. Provide aggregate for microsurfacing that is crushed gravel, crushed calcite cemented sandstone, or chat which is a material obtained from the mining of lead and zinc ores. Produce crushed gravel by mechanical crushing of siliceous gravel and not containing more than 15% non- siliceous material. b. Quality. Soundness, minimum (KTMR-21) ................................................................. 0.90 Wear, maximum (AASHTO T 96) ................................................................. 40% c. Product Control. Provide material that complies with TABLE 1109-1: TABLE 1109-1: GRADING REQUIREMENTS Percent Retained - Square Mesh Sieves ½” 3/8” No. 4 No. 8 No. 16 No. 30 No. 50 No. 200 0 0-1 6-14 35-55 54-75 65-85 75-90 85-95 Additional Requirements for Crushed Gravel. Percent Crushed Particles (KT-31) (minimum) ............................................. 98%* Uncompacted Void Content of Fine Aggregates (KT-50) (minimum) .......... 46% Sand Equivalent (KT-55) (minimum) ............................................................ 65% *Provide 98% of the crushed gravel with 2 or more fractured faces. Deleterious Substances. Provide materials that ar e free from weeds, sticks, grass, roots and other undesirable foreign matter. d. Stockpiling. Stockpile and handle aggregates in such a manner to prevent detrimental degradation and segregation, the incorporation of appreciable amounts of foreign material, and the intermingling of stockpiled materials.
1109.3 Test Methods
Test aggregates according to the applicable provisions of SECTION 1115.
1109.4 Prequalification
Prequalify aggregate sources according to subsection 1101.4.
1109.5 Basis of Acceptance
Aggregates covered by this subsection are accepted based on the procedures described in subsection 1101.5.
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