813_SpotSurfacing.pdf

Section 703 - Aggregate

703.01 Fine Aggregate for Portland Cement Concrete

As fine aggregate, use sand that conforms to the requirements shown below.

(a) For structural concrete, fine aggregate is sand that conforms to AASHTO M 6, Class B, but limit the material that passes the No. 200 sieve to 3.0 percent. Also meet the supplementary requirements of AASHTO M 6 for reactive aggregates.

Use material that conforms to sand equivalent value, AASHTO T 176, alternate method number 2, 75 minimum.

(b) For structural concrete, lightweight fine aggregate is sand that conforms to

AASHTO M 195, where applicable.

(c) For minor concrete structures, meet requirements specified in AASHTO M 6.

703.02 Coarse Aggregate for Portland Cement Concrete

Furnish coarse aggregate that conforms to the requirements listed below.

(a) For structural concrete, furnish coarse aggregate that conforms to AASHTO M 80, Class A, but use aggregates with a percentage of wear that is not more than 40 percent, in accordance with AASHTO T 96. In concrete used in bridge decks or for paving, do not use aggregates known to polish, or carbonate aggregates containing by weight less than 25 percent insoluble residue, as determined by

ASTM D 3042.

Ensure that the adherent coating on the aggregate does not exceed 1.0 percent when tested in accordance with FLH T 512.

(b) For structural concrete, furnish lightweight coarse aggregate that conforms to

AASHTO M 195, when applicable.

(c) For minor concrete structures, aggregate must meet AASHTO M 80 and the Class designations that are appropriate for end use and weathering exposure.

703.03 Granular Backfill

(a) Coarse Granular Backfill. Furnish backfill material that conforms to AASHTO M 80, Class E, and AASHTO M 43, grading no. 3, 4, 5, 7, 57, or 67. Minor variations in the gradation and the deleterious substance content are subject to approval by the CO.

(b) Fine Granular Backfill. Furnish backfill material that conforms to AASHTO M 6.

The soundness test is not required. Minor variations in the gradation and the deleterious substance content are subject to approval by the CO.

703.04 Sheathing Material

Furnish either fine aggregate meeting gradation requirements of AASHTO M 6, or coarse aggregate consisting of sound, durable particles of gravel, slag, or crushed stone, as specified in Table 703-1.

Table 703-1. – Sheathing material gradation.

Sieve Designation (inch)

% by Weight Passing Standard Sieves (AASHTO T 11 and T 27)

3 100 ¾ 50 - 90

No. 4 20 - 50 No. 200 0.0 - 2.0

703.05 Subbase, Base, & Surface Course Aggregate

(a) General. Furnish aggregates that consist of hard, durable particles or fragments of crushed stone, crushed slag, or crushed gravel meeting the appropriate gradation, as shown in Table 703-2 or 703-3, and conforming to the following:

(1) Los Angeles abrasion, AASHTO T 96 ..................................40% max.

(2) Sodium sulfate soundness loss (five cycles), AASHTO T 104 ....................................................................12% max.

(3) Durability index (coarse), AASHTO T 210 ..........................35 min.

(4) Durability index (fine), AASHTO T 210 ..............................35 min.

(5) Fractured faces, FLH T 507 ..................................................50% min.

Furnish a material that is free from organic matter and lumps or balls of clay. Do not use material that breaks up when alternately frozen and thawed or wetted and dried.

Obtain the aggregate gradation by crushing, screening, and blending processes as necessary. Ensure that fine aggregate (material passing the No. 4 sieve) consists of natural or crushed sand and fine mineral particles.

(b) Subbase & Base Aggregates. Furnish subbase or base aggregate that conforms to specifications in Subsection 703.05(a), and to the following:

(1) Liquid limit, AASHTO T 89 .................................................25 max.

(2) Plastic limit, AASHTO T 90 .................................................Nonplastic

Table 703-2. - Gradation TV ranges for subbase and base.

% by Weight Passing Designated Sieve (AASHTO T 27 and T 11)

Grading Designation Sieve Size

(inch) A

(Subbase) B

(Subbase) C

(Subbase) D

(Subbase) E

(Subbase) 2 ½ 100 - - - -

2 97-100 100 100 - - 1 ½ - 97-100 97-100 100 - 1 65-79 (6) - - 97-100 100 ¾ - - 67-81 (6) - 97-100 ½ 45-59 (7) - - - -

3/8 - - - 56-70 (7) 67-79 (6) No. 4 28-42 (6) 40-60 (8) 33-47 (6) 39-53 (6) 47-59 (7)

No. 40 9-17 (4) - 10-19 (4) 12-21 (4) 12-21 (4) No. 200 4.0-8.0 (3) 0.0-12.0 (4) 4.0-8.0 (3) 4.0-8.0 (3) 4.0-8.0 (3)

Note: Allowable deviations (±) from TV are shown in parentheses.

Table 703-3. - Gradation TV ranges for surface courses.

% by Weight Passing Designated Sieve (AASHTO T 27 and T 11)

Grading Designation Sieve Size (inch) F G

1 ½ 100 - 1 97-100 100 ¾ 76-89 (6) 97-100

3/8 56-68 (6) 70-80 (6) No. 4 43-53 (7) 51-63 (7)

No. 16 23-32 (6) 28-39 (6) No. 40 15-23 (4) 19-27 (5)

No. 200 10-16 (4) 10-16 (4)

Note: Allowable deviations (±) from TV are shown in parentheses. If the plasticity index (PI) is greater than 0, the TV range for the No. 200 sieve size is 6–12 (± 4).

(c) Surface Course Aggregate. Furnish surface course aggregate that conforms to specifications in Subsection 703.05(a), and to the following:

(1) Liquid limit, AASHTO T 89 .................................................35 max.

(2) Plasticity index, AASHTO T 90:

(a) If the percent passing the No. 200 inch sieve is less than 12% ..........................................................................2 to 9 pablogonzalez Rectangle

(b) If the percent passing the No. 200 inch sieve is greater than 12%

Do not furnish material that contains asbestos fibers.