A06_0040666828_CANY-Supply_UBC-Attachment_1_2024.doc
DOC document 49 KB Posted
- Attached to
- CANY-SUPPLY UBC
- Solicitation number
- 140P1224Q0062
About this file
This document is a specification for Untreated Base Course (UTBC) material to be used for pavements, shoulders, and incidental construction. It outlines the required properties and gradation limits for the UTBC material, including specifications for aggregate wear, liquid limit, plastic index, and California Bearing Ratio. The contractor must submit a written report for approval of the aggregate source and provide the job mix gradation within the specified limits. Acceptance sampling and testing will be in accordance with UDOT Minimum Sampling and Testing Requirements.
The related federal contract opportunity is for the CANY-SUPPLY UBC requirement, solicited by the Department of the Interior National Park Service Intermountain Region. The solicitation number is 140P1224Q0062.
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| File | Type | Posted |
|---|---|---|
| A06_0040666828_CANY-Supply_UBC-SOW_2024.doc | DOC document | |
| Sol_140P1224Q0062.pdf |
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Text version
SECTION 02721
UNTREATED BASE COURSE (UTBC)
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-(m (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:
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.
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.
Untreated Base Course (UTBC)
02721 – Page of 3 January 1, 2008
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