03330 Exposed Aggregate.doc

Pavements IDIQ

JCGU 09-1700

DIVISION 03 - CONCRETE

SECTION 03330 - INSTALLATION OF EXPOSED AGGREGATE

PART 1 - GENERAL:

1.1 REFERENCES: The publications listed below form a part of this specification to the extent referenced. The publications are referred to in the text by basic designation only. All publications shall be the latest version/edition/revision of the documents listed below, in effect on the date of this solicitation, except where a date is given.

ACI 318/318R

Building Code Requirements for Structural Concrete and Commentary

1.2 SUBMITTALS:

SAMPLING AND TESTING:

Sampling and testing will follow Specification SECTIONS 02511 and 03300.

PART 2 – PRODUCTS:

2.1 EXPOSED AGGREGATE MATERIALS:

Exposed aggregates shall be washed and graded Colorado River natural gravel. Gravel graduation shall be from 1/4” to 3/4". The aggregate shall be structurally sound, dry, and of a uniform size as possible. The aggregate shall be clean, washed aggregate free from fines that would interfere with a finished surface of uniform appearance (maximum allowable is 1 percent). Aggregate shall be rounded and free from injurious amounts of organic impurities or clay. Maximum allowable amounts of deleterious substances is 3 percent.

2.2 ACCESSORY MATERIALS:

2.2.1 Cleaning agent: As recommended by concrete manufacturer.

2.2.2 Bonding agent: As recommended by concrete manufacturer.

PART 3 – EXECUTION:

3.1 AGGREGATE EXPOSURE:

3.1.1 After concrete has been struck off and floated, evenly broadcast one-size coarse aggregate on the surface. Tamp aggregate particles into concrete until well embedded to insure being held securely during later treatment. A concrete mix design that includes the raised aggregate “Colorado River natural gravel” can be used if approved by the Contracting Officer.

3.1.2 When concrete has hardened enough to hold embedded particles firmly in place, gently broom, brush and flush excess mortar away until desired finish is obtained (appearance shall match sample panels and existing troopwalk/Goodfellow AFB standard).

3.1.3 Do not expose more than 30 percent of aggregate surface.

3.2 CURING:

The curing method and procedure should follow Specification SECTION 02511. The minimum curing period for exposed aggregate concrete shall be 7 days.

3.3 CLEANING:

When the desired finish is achieved, thoroughly wash and rinse exposed aggregate surfaces with cleaning agent recommended by manufacturer.

END OF SECTION

Section 03330 – Page 1 of 2