1112 - AGGREGATES FOR SURFACING OR SUBGRADE MODIFICATION FOR COUNTY SECONDARY ROADS 1100-32 AGGREGATES FOR SURFACING OR SUBGRADE MODIFICATION FOR COUNTY SECONDARY ROADS
1112.1 Description
This specification covers types of aggregates used for surfacing or subgrade modification for county secondary roads as shown in the Contract Documents.
1112.2 Requirements
a. Composition . Provide one of the types of aggregate for surfacing or subgrade modification for secondary roads as shown in TABLE 1112-1 and 1112-2. b. Quality 1. Soundness2, minimum (KTMR-21) ............................................................... 0.85 Wear3, maximum (AASHTO T 96) ............................................................... 55% 1Crushed aggregates with less than 10% material retained on the No. 4 sieve (excluding mineral filler supplements) must be produced from a source complying with the official quality requirements of this Section prior to crushing. 2The above requirements for soundness do not apply for aggregates having less than 10% material retained on the No. 4 sieve. 3The above requirements for wear do not apply to aggregates having less than 10% material retained on the No. 8 sieve. c. Product Control.
1.Size Requirements. Provid e aggregate that complies with TABLE 1112-1. Determine the gradation factor in accordance with the proced ures listed in Part V, Section 5.10.5-Fineness Modulus of Aggregates (Gradation Factor). TABLE 1112-1: GRADATION REQUIREMENTS Type Material Percent retained On standard square mesh sieves* Gradation Factor 2” 1 ½” 1” ¾” 3/8” No. 4 No. 8 No. 30 No. 200 SS-3 Crushed Stone 0 0-15 45-85 90-100 92-100 SS-5 Crushed Stone 0 0-5 0-30 45-90 90-100 92-100 SS-7 Sand-gravel 0 0-5 0-20 97-100 4.00 - 5.00** SS-8 Sand-gravel 0 0-5 0-30 92-100 3.75+ SS-9 Sand-gravel 0 0-20 90-100 3.50+ SS-10 Sand-gravel 0 0-5 0-30 90-100 3.25+ SS-14 Limestone gravel 0 93-100 *After removal of all deleterious substances **For grading factors less than 4.00 but greater than 3.75, pr ovide additional materials as a penalty at a rate of 1.5% for each 0.05 less than 4.00 grading factors. Use a maximum lot size of 500 cubic yards or tons to determine penalty. Average all tests within the lot to determine penalty. 1112 - AGGREGATES FOR SURFACING OR SUBGRADE MODIFICATION FOR COUNTY SECONDARY ROADS 1100-33
2.Deleterious Substances. Do not exceed th e values for each respective type as shown in TABLE 1112- 2. TABLE 1112-2: DELETERIOUS SUBSTANCES Type Material Sticks (wet) Clay Lumps & Friable Particles Combination1 SS-3 Crushed Stone 2.0 5.0 5.0 SS-5 Crushed Stone 2.0 5.0 5.0 SS-7 Sand-gravel 2.0 5.0 5.0 SS-8 Sand-gravel 2.0 4.0 SS-9 Sand-gravel 2.0 3.0 SS-10 Sand-gravel 2.0 3.0 SS-14 Limestone gravel 1Of any deleterious substances. 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.
1112.3 Test Methods
Test aggregates according to the applicable provisions of SECTION 1115.
1112.4 Prequalification
Prequalify aggregate sources according to subsection 1101.4.
1112.5 Basis of Acceptance
Aggregates covered by this subsection are accepted based on the procedures described in subsection 1101.5.
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Source: Standard Specifications for State Road and Bridge Construction, 2015 Edition. Pages 689–690 of 978. View official source ↗