Attach_3_Specs_Supply_UBC_0001.pdf

Attachment 3 140P1224Q0026 Specifications: UNTREATED BASE COURSE (UTBC) Section 02721

Untreated Base Course (UTBC) 02721 – Page 1 of 3

January 1, 2024

PART 1 GENERAL

1.1 SECTION INCLUDES

A. Supply of UTBC used for pavements, shoulders, and incidental construction.

1.2 RELATED SECTIONS

A. Not Used

1.3 REFERENCES

A. AASHTO T 11: Materials Finer than 75-µm (No. 200) Sieve in Mineral Aggregates by Washing

B. AASHTO T 19: Bulk Density (“Unit Weight”) and Voids in Aggregate

C. AASHTO T 27: Sieve Analysis of Fine and Coarse Aggregates

D. AASHTO T 89: Determining the Liquid Limit of Soils

E. AASHTO T 90: Determining the Plastic Limit and Plasticity Index of Soils

F. AASHTO T 96: Resistance to Degradation of Small-Sized Coarse

Aggregate by Abrasion and Impact in the Los Angeles Machine

G. AASHTO T 180: Moisture-Density Relations of Soils Using a 4.54 kg (10

lb) Rammer and 457 mm (18 in) Drop

H. AASHTO T 193: The California Bearing Ratio

I. AASHTO T 255: Total Evaporable Moisture Content of Aggregate by Drying

J. AASHTO TP 61: Determining the Percent of Fracture in Coarse Aggregate

K. UDOT Minimum Sampling and Testing Requirements

1.4 DEFINITIONS Not Used

1.5 SUBMITTALS

A. Submit a written report for approval for each aggregate class and source, a minimum of five working days prior to delivery. Include the following:

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January 1, 2024

1. Aggregate suitability. Refer to this Section, Part 2, Products.

2. Name of supplier and location of source.

3. Maximum Dry Density and Optimum Moisture Content. Refer to

AASHTO T 180, Method D.

4. Job mix gradation including single values for each sieve size, No. 4 and finer, within the gradation limits of Table 2.

1.6 ACCEPTANCE

A. Acceptance sampling and testing of material is in accordance with UDOT Minimum Sampling and Testing Requirements.

PART 2 PRODUCTS

2.1 AGGREGATES

A. Contractor to provide well-graded, clean, hard, tough, durable and sound mineral aggregates consisting of crushed stone, crushed gravel or crushed slag; free of organic matter and contamination from chemical or petroleum products; meeting the requirements of Table 1.

Table 1

Aggregate Properties Aggregate Class A B C Dry Rodded Unit Weight Not less than 75 lb/ft3 AASHTO T 19

Liquid Limit/Plastic Index Non-plastic PI ≤ 6 AASHTO T 89

AASHTO 90

Aggregate Wear Not to exceed 50 percent. AASHTO T 96

Gradation Table 2 AASHTO T 11

AASHTO T 27

CBR with a 10 lb surcharge measured at

0.20 inch penetration

70% Minimum N/A AASHTO T 193

Two Fractured Faces 50 % Min N/A N/A AASHTO TP 61

B. Contractor shall establish the job mix (target) gradation for the 1½ inch sieve and finer within the gradation limits. The Job Mix Gradation Tolerance is the allowable deviation from the job mix (target) gradation on the applicable sieves. All other percents passing will be within the gradation limits. Refer to AASHTO T 11 and AASHTO T 27.

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Table 2

Gradation Limits Sieve Size Job Mix Gradation

Target Band Job Mix Gradation

Tolerance

1½ inch 1 inch ¾ inch ½ inch ⅜ inch No. 4 No. 16 No. 200

90 - 100 70 - 85 65 - 80 55 - 75 40 - 65 25 - 40 7 - 11

±9.0 ±9.0 ±9.0 ±9.0 ±7.0 ±5.0 ±3.0

Percent passing based on total aggregate (dry weight), and fine and coarse aggregate having approximately the same bulk specific gravities.