Article 1 — Description
Furnish aggregate for surface treatments in conformance with the type, grade, and Surface Aggregate Classification (SAC) shown on the plans.
Article 2 — Materials
Furnish uncontaminated materials of uniform quality throughout that meet the requirements of the plans and specifications. Notify the Engineer of all proposed material sources and of changes to material sources. The Engineer will designate the sampling loc ation.
2.1 Aggregate . Stockpile aggregates for each source and type separately. Do not add materials to approved
stockpiles without approval. Furnish aggregate of the type shown on the plans and in Table 1. Use Tex -100-E material definitions. Table 1 Aggregate Types Type Material A Gravel, crushed slag, crushed stone, or limestone rock asphalt (LRA) B Crushed gravel, crushed slag, crushed stone, or LRA C Gravel, crushed slag, or crushed stone D Crushed gravel, crushed slag, or crushed stone E Aggregate as shown on the plans L Lightweight aggregate PA Precoated gravel, crushed slag, crushed stone, or LRA PB Precoated crushed gravel, crushed slag, crushed stone, or LRA PC Precoated gravel, crushed slag, or crushed stone PD Precoated crushed gravel, crushed slag, or crushed stone PE Precoated aggregate as shown on the plans PL Precoated lightweight aggregat e Ensure the aggregate gradation meets the requirements shown in Table 2 for the specified grade, unless otherwise approved. Furnish aggregate that meet s the requirements shown in Table 3, unless otherwise shown on the plans. Furnish LRA in accordance with DMS -9210 , “Limestone Rock Asphalt,” when used. Provide aggregates from sources listed in the Department’s Bituminous Rated Source Quality Catalog (BRSQC). Use material not listed or not meeting the requirements of the BRSQC only when tested by the Engineer and approved before use. A llow 30 calendar days for testing of material from such sources. Provide aggregates for final surfaces that meet the SAC shown on the plans. Do not blend to meet the SAC. The SAC requirement will apply only to the aggregate used on the travel lanes unless otherwise shown on the plans. The BRSQC lists the SAC for sources i n the Aggregate Quality Monitoring Program . 244 Table 2 Aggregate Gradation Requirements (Cumulative % Retained1) Sieve Grade 1 2 3S2 3 4S2 4 5S2 5 Non-Lightweight Lightweight 1" – – – – – – – – – 7/8" 0–2 0 – – – – – – – 3/4" 20–35 0–2 0 0 0 – – – – 5/8" 85–100 20–40 0–5 0–5 0–2 0 0 – – 1/2" – 80–100 55–85 20–45 10–25 0–5 0–5 0 0 3/8" 95–100 95–100 95–100 80–100 60–80 60–85 20–45 0–5 0–5 1/4" – – – 95–100 95–100 – – 65–85 – #4 – – – – – 95–100 95–100 95–100 50–80 #8 99–100 99–100 99–100 98–100 98–100 98–100 98–100 98–100 98–100 1. Round test results to the nearest whole number. 2. Single -size gradation. Table 3 Aggregate Quality Requirements Property Test Method Requirement1 Minimum Maximum SAC Tex-499-A As shown on the plans Deleterious Material2, % Tex-217-F, Part I – 2.0 Decantation, % Tex-406-A – 1.5 Flakiness Index, % Tex-224-F – 17 Gradation Tex-200-F, Part I Table 2 requirements Los Angeles Abrasion, % Tex-410-A – 35 Magnesium Sulfate Soundness, 5 Cycle, % Tex-411-A – 25 Coarse Aggregate Angularity3, 2 Crushed Faces, % Tex-460-A , Part I 85 – Additional Requirements for Lightweight Aggregate Dry Loose Unit Wt., lb./cu. ft. Tex-404-A 35 65 Pressure Slaking, % Tex-431-A – 6.0 Freeze -Thaw Loss, % Tex-432- A – 10.0 Water Absorption, 24 hr., % Tex-433-A – 12.0 1. Material requirements listed in the table, unless otherwise shown on the plans. 2. Not required for lightweight aggregate. 3. Required only for crushed gravel.
2.2 Precoating . Precoat aggregate uniformly and adequately with asphalt material to the satisfaction of the
Engineer when shown on the plans. Specific aggregates may be prohibited from being precoated when shown on the plans. Meet requirements shown in Table 2 and Table 3 before precoating. Furnish precoated aggregate that spreads uniformly using approved mechanical spreading equipment. Precoat LRA in accordance with DMS -9210 , when used. The Engineer retains the right to select a target value for the desired percent by weight of residual bitumen coating on the aggregate. Furnish precoated aggregate that is within ±0.3% of the target value when tested in accordance with Tex -236-F . The Engineer may require trial batches to assist in selecting the target value. LRA is exempt from these requirements. The Engineer retains the right to remove precoat material from aggregate samples in accordance with Tex-210-F , or as recommended by the Materials and Tests Division, and test the aggregate to verify compliance with requirements shown in Table 2 and Table 3. Gradation testing may be performed with precoat intact. 245 2.2.1. Asphalt Material . Precoat the aggregates with asphalt material that meets the requirements of Item 300, “Asphalts, Oils, and Emulsions.” Use any asphalt material that meets the requirements of Item 300 unless a specific precoat material is shown on the plans . 2.2.1.1. Asphalt Material Sampling and Testing. S ample each binder grade and source used in accordance with Tex-500-C and witnessed by the Engineer. The Contractor will notify the Engineer when the sampling will occur. The Engineer will submit the sample to the Materials and Tests Division to verify compliance with Item 300.
2.2.2 Additives . Use the type and rate of additive specified when shown on the plans. Add in accordance with
Item 301, “Asphalt Antistripping Agents.” Use Tex -530-C for verification during production testing unless otherwise directed.
2.3 Sampling . Personnel who conduct sampling and witnessing of sampling must be certified by the
Department -approved certification program. Supply the Engineer with a list of certified personnel and copies of their current certificates before beginning construction and when personnel changes are made. At any time during the project, the Engineer may perform production tests as deemed necessary in accordance with Item 5, “Control of the Work.” The Engineer, unless otherwise directed, will sample aggregate from stockpiles located at the production site, intermediate distribution site, or project location in accordance with Te x-221-F . The Engineer, unless otherwise directed, will split each sample into two equal portions in accordance with Tex-200-F , and label these portions for the Engineer and Contractor as deemed appropriate. Witness t he sampling and splitting and take immediate possession of the samples labeled for the Contractor. When the Engineer does not sample, the Engineer must witness the sampling of aggregates designated for the Engineer and will take immediate possession of them.
2.4 Reporting and Responsibilities . The Engineer will provide test results to the Contractor and supplier within
10 working days from the date the stockpile was sampled for sources listed in the Department’s BRSQC, unless otherwise directed. The Engineer will provide test results for the Los Angeles Abrasion ( Tex-410-A ) and Magnesium Sulfate Soundness ( Tex-411-A ) tests within 30 calendar days for sources not listed in the BRSQC. The Engineer will report to the other party within 24 hr. when any test result does not meet the requirement s shown in Table 2 or Table 3.
Article 3 — Equipment
Manufacture precoated aggregate at a mixing plant that produces uniformly coated aggregate.
Article 4 — Construction
Deliver aggregate to the locations shown on the plans. Prevent segregation, mixing of the various materials or sizes, and contamination by foreign materials when aggregates are stockpiled. The Engineer will reject contaminated stockpiles. Provide adequate initial cooling of precoated aggregate to prevent asphalt or aggregate damage due to excessive heat buildup in stockpiles. Limit stockpile height to 3 ft. immediately after production when asphalt cement is the precoating material. Consolidate stockpiles after adequate cooling, as approved. The Engineer will reject stockpiles showing evidence of damage due to excessive heat buildup.
Article 5 — Measurement and Payme Nt
The work performed, materials furnished, equipment, tools, and incidentals will not be measured or paid for directly but will be subsidiary to or included under “Payment” in other pertinent Items.